Slender pipe network, multi-span greenhouse distributed heat storage unit and construction method and use method of multi-span greenhouse large geothermal island

Abstract

The invention provides a multi-span greenhouse distributed heat storage unit and a construction method and a use method of a multi-span greenhouse large geothermal island, and relates to the technical field of multi-span greenhouse energy conservation. The multi-span greenhouse distributed heat storage unit comprises a heat absorption assembly unit, a heat storage assembly unit and a driving assembly. The heat absorption assembly unit comprises a plurality of heat absorption fluid pipe cavities; the heat storage assembly unit comprises a plurality of heat absorption and release fluid pipes; the driving assembly comprises a fluid pipeline pump and fluid pipeline sections, the fluid pipeline pump is arranged between the heat absorption assembly unit and the heat storage assembly unit, and at least two fluid pipeline sections are arranged at the two ends of the fluid pipeline pump. One ends of a plurality of heat absorption fluid pipe cavities of the heat absorption assembly unit and one ends of a plurality of heat absorption and release fluid pipes of the heat storage assembly unit are respectively connected with a fluid pipeline pump, a heat flow system of a fluid heat medium is formed between the space of the heat island unit and the heat storage medium, and the service life of the arch frame structure of the multi-span greenhouse is not influenced.

Description

[0001] This application is a divisional application of an invention with the application number 2023100738429, the application date of February 3, 2023, and the invention title of "Multi-span greenhouse distributed heat storage unit, multi-span greenhouse large-scale ground heat island construction method and its usage method". Technical Field

[0002] This application relates to the technical field of energy conservation in multi-span greenhouses. Specifically, it relates to a multi-span greenhouse distributed heat storage unit, a multi-span greenhouse large-scale ground heat island construction method and its usage method. Background Art

[0003] Multi-span greenhouses are used for various biological productions such as plant cultivation, livestock and poultry breeding, aquaculture, anaerobic fermentation, aerobic fermentation, and algae cultivation. All kinds of biological productions require a suitable temperature environment. The long-term low temperature in multi-span greenhouses in winter will cause biological production to stagnate. For some biological productions, even a short-term temperature environment less than or equal to 0 °C in multi-span greenhouses will cause biological death, resulting in irreversible losses.

[0004] On sunny days in winter, the air temperature near the ridge inside the multi-span greenhouse can reach about 45 °C, which is rich in a large amount of air heat energy. Usually, the ventilation openings of the multi-span greenhouse are opened to discharge this hot air to avoid heat damage to biological production, and these heat energies are wasted along with the discharged hot air. But at the same time, the ground inside the multi-span greenhouse has a very low temperature due to the lack of heat energy supply. For example, during the same period, the soil temperature inside the multi-span greenhouse used for plant cultivation is relatively low, affecting root development; during the same period, the ground temperature inside the multi-span greenhouse used for cattle and sheep breeding is relatively low, and the cattle and sheep directly step on or lie on the cold ground; during the same period, the water temperature at the lower part of the fish pond inside the multi-span greenhouse used for aquaculture is relatively low, affecting the development of aquatic animals.

[0005] In the related art, arch frames of multi-span greenhouses can be composed of pipe materials (rectangular pipes, elliptical pipes, circular pipes), and the pipe cavities of the arch frames can be used as heat exchange structures for fluid heat carriers (water or air) to absorb the heat energy of the air inside the multi-span greenhouse and transfer it to a preset location for standby according to a preset plan. However, the following problems exist: First, the cost problem. The hot air inside the multi-span greenhouse contains a large amount of harmful substances such as water vapor, carbon dioxide, nitrogen oxides, hydrogen sulfide, ammonia, and chemical agents that are corrosive and oxidizing to metal materials. These harmful substances entering the pipe cavity will accelerate the oxidation and corrosion of the inner wall of the pipe cavity. The arch frame is the main load-bearing structure of the multi-span greenhouse. Using the pipe cavity of the arch frame as a heat exchange structure for fluid heat carriers requires adding a functional structure layer with anti-oxidation and anti-corrosion functions to the inner wall of the pipe cavity, which correspondingly increases the cost of the arch frame. Otherwise, once the pipe wall of the arch frame is oxidized and corroded, there will be potential safety hazards in the main structure of the multi-span greenhouse, and the arch frame will be scrapped in advance, resulting in a large replacement cost. Second, the heat loss problem. The arch frame is a metal structure (such as a steel structure, an aluminum alloy structure, etc.), and the heat conduction and heat release speed are very fast. The arch frame of the multi-span greenhouse directly supports and connects the film enclosure structure, and the pipe wall in close connection with the film will quickly transfer the heat energy in the pipe cavity to the atmosphere outside the greenhouse through the film with almost no heat resistance, resulting in a significant reduction in the heat absorption efficiency of the available arch frame. Third, the limitation problem. Using the pipe cavity of the arch frame pipe material as a heat exchange structure for fluid heat carriers, the arch frame of the multi-span greenhouse can only use pipe materials and cannot use other inexpensive profiles (such as channel steel, T-shaped steel, C-shaped steel, etc.), which makes the steel consumption of the arch frame of the multi-span greenhouse relatively large. Summary of the Invention

[0006] The embodiments of the present application provide a distributed heat storage unit for multi-span greenhouses, a method for constructing a large-scale ground heat island in multi-span greenhouses, and a method for using the same. The advantage is that the distributed heat storage unit for multi-span greenhouses is relatively independent of the arch frame structure of the multi-span greenhouse, that is, it has nothing to do with whether the arch frame structure of the multi-span greenhouse is made of pipe materials. Enabling the distributed heat storage unit for multi-span greenhouses to construct a large-scale ground heat island in multi-span greenhouses does not affect the service life of the arch frame structure of the multi-span greenhouse, and the arch frame structure of the multi-span greenhouse has little influence on the working heat efficiency of the distributed heat storage unit for multi-span greenhouses.

[0007] In a first aspect, an embodiment of the present application provides a multi-span greenhouse distributed heat storage unit for performing heat absorption and storage operations within a preset heat island unit range inside the multi-span greenhouse, including a heat absorption component unit, a heat storage component unit, and a driving component; the heat absorption component unit includes a plurality of heat absorption fluid cavities for passing a fluid heat medium, and the plurality of heat absorption fluid cavities are arranged at intervals in the space of the preset heat island unit inside the multi-span greenhouse; the heat storage component unit includes a plurality of heat absorption and release fluid pipes arranged in the heat storage medium of the preset heat island unit inside the multi-span greenhouse; the driving component includes a fluid pipeline pump and fluid pipeline sections, the fluid pipeline pump is arranged between the heat absorption component unit and the heat storage component unit, and at least two of the fluid pipeline sections are arranged at both ends of the fluid pipeline pump to connect one end of each of the plurality of heat absorption fluid cavities of the heat absorption component unit and one end of each of the plurality of heat absorption and release fluid pipes of the heat storage component unit to the fluid pipeline pump together, so as to form a heat flow system of the fluid heat medium between the space and the heat storage medium of the preset heat island unit inside the multi-span greenhouse.

[0008] In the above technical solution, the heat absorption component unit, the heat storage component unit, and the matching driving component can be arranged in the space of the heat island unit of the multi-span greenhouse and in the heat storage medium with the support of the multi-span greenhouse structure. The advantages of arranging the heat absorption component unit, the heat storage component unit, and the matching driving component with the support of the multi-span greenhouse structure are as follows: First, a plurality of heat absorption fluid cavities of the heat absorption component unit can be arranged on the arch frames forming the multi-span greenhouse structure, and then the fluid pipeline sections can be arranged on the trusses forming the multi-span greenhouse structure, so as to avoid shading the ground of the heat island unit by setting them separately; Second, the chamber walls of the plurality of heat absorption fluid cavities forming the heat absorption component unit and the pipe walls of the plurality of heat absorption and release fluid pipes forming the heat storage component unit can be set as thin walls to reduce the thermal resistance and improve the heat exchange efficiency.

[0009] In some embodiments of the first aspect of the present application, the heat absorption and release fluid pipe includes an elongated pipe network, the elongated pipe network includes a plurality of elongated pipes arranged at intervals, and a shunt main pipe and a confluence main pipe connected in parallel to both ends of the elongated pipe; at least the middle part of the elongated pipe is buried in the heat storage medium, the shunt main pipe is connected to the fluid pipeline pump through the fluid pipeline section, and the confluence main pipe is connected to one end of each of the plurality of heat absorption fluid cavities of the heat absorption component unit through the fluid pipeline section for forming a one-way closed heat flow system; alternatively, the confluence main pipe communicates with the multi-span greenhouse space for forming a one-way open heat flow system.

[0010] In the above technical solution, the slender pipe network includes a plurality of slender pipes arranged at intervals. The smaller the diameter of the slender pipe, the easier it is for the fluid heat medium in the pipe to absorb heat and increase in temperature or release heat and decrease in temperature. The fluid heat medium in the slender pipe can quickly pass through the slender pipe under the action of the driving component, namely, the fluid pipeline pump, so that the one-way closed heat flow system, or the one-way open heat flow system can operate quickly, thereby improving the heat absorption-storage heat-release function of the multi-span greenhouse distributed heat storage unit.

[0011] In some embodiments of the first aspect of the present application, the multi-span greenhouse distributed heat storage unit is the first type of multi-span greenhouse distributed heat storage unit. The heat-absorbing fluid pipe cavity is a water flow multi-pipe cavity complex composed of slender pipe bundles. The slender pipe network is a water pipe network. The fluid pipeline pump is a water pump, and the water pump is arranged on the side of the shunt main pipe of the water pipe network. The heat-absorbing fluid pipe cavity includes: two multi-pipe cavity end connectors. The multi-pipe cavity end connector includes a shunt end and a confluence end. The shunt ends of the two multi-pipe cavity end connectors are respectively connected to the two ends of the water flow multi-pipe cavity complex. The confluence ends of the multi-pipe cavity end connectors of the water flow multi-pipe cavity complex are connected to the water pump by the fluid pipeline section. The water pump is connected to the shunt main pipe of the water pipe network by the fluid pipeline section. The confluence main pipe of the water pipe network is connected to the confluence end of the multi-pipe cavity end connector of the water flow multi-pipe cavity complex by the fluid pipeline section, forming a one-way closed heat flow system for water circulation.

[0012] In the above technical solution, the combination form of the multi-cavity slender pipe bundle and the water flow heat medium can improve the heat exchange efficiency of the heat-absorbing fluid pipe cavity; the use of the multi-pipe cavity end connector can improve the connection and installation efficiency between the slender pipe bundle and the water pipe network; the structure of the one-way closed heat flow system for water circulation is simple, requires less driving force, and has low system operation costs.

[0013] In some embodiments of the first aspect of the present application, the multi-span greenhouse distributed heat storage unit is the second type of multi-span greenhouse distributed heat storage unit. The heat-absorbing fluid pipe cavity is an air flow single pipe cavity composed of slender pipes. The air flow single pipe cavity is a semi-circular arc slender pipe. The upper part of the semi-circular arc slender pipe is provided with a first air inlet hole of the air flow single pipe cavity; the slender pipe network is an air pipe network, and the confluence main pipe of the air pipe network is provided with an air outlet hole; the fluid pipeline pump is a fan, and the fan is arranged on the side of the semi-circular arc slender pipe and the shunt main pipe of the air pipe network; the heat-absorbing fluid pipe cavity includes: a single pipe cavity end connector, and the single pipe cavity end connector is connected to the lower bottom end of the semi-circular arc slender pipe. The single pipe cavity end connector is connected to the fan by the fluid pipeline section. The fan is connected to the shunt main pipe of the air pipe network by the fluid pipeline section, forming a one-way open heat flow system for air circulation.

[0014] In the above technical solution, the heat-absorbing fluid lumen is a semi-arc slender tube, which can greatly reduce the layout cost of the heat-absorbing fluid tube; the unidirectional open heat flow system composed of the semi-arc slender tube, the fan and the air pipe network has a simple structure, low maintenance cost and low operating cost. Moreover, it can be directly upgraded through technological transformation to obtain a heat release system for large-scale ground heat island units, and the heat energy in the large-scale ground heat island can be used to alleviate the reduction of the temperature in the multi-span greenhouse at night in winter.

[0015] It should be noted that during the operation of constructing the large-scale ground heat island with the unidirectional open heat flow system composed of the semi-arc slender tube, the fan and the air pipe network, when the humid hot air enters the underground air pipe network from the semi-arc slender tube and encounters cold, condensate water will appear, which may block the air pipe network. Water-permeable holes can be provided on the slender tube walls forming the air pipe network, and the condensate water will pass through the water-permeable holes and penetrate through the slender tube walls, thereby eliminating the blockage.

[0016] In some embodiments of the first aspect of the present application, the multi-span greenhouse distributed heat storage unit is the third multi-span greenhouse distributed heat storage unit. The heat-absorbing fluid lumen includes a water-air flow lumen complex composed of a slender tube bundle forming a multi-tube lumen for water flow and a single-tube lumen for air flow surrounded by it. The tube walls of each of the multi-tube lumens for water flow are connected by tube wings, and a plurality of the tube wings connect the multi-tube lumens for water flow into a closed loop. The single-tube lumen for air flow is surrounded by the tube wings and the tube walls of each of the multi-tube lumens for water flow. A notch is provided on the tube wing located in the middle of the single-tube lumen for air flow, which serves as the second air inlet hole of the single-tube lumen for air flow; the slender pipe network includes a water pipe network and an air pipe network, and an air outlet hole is provided on the confluence main pipe of the air pipe network; the water pipe network and the air pipe network are arranged in layers in the preset heat island unit heat storage medium inside the multi-span greenhouse; the fluid pipeline pump includes a water pump and a fan; the heat-absorbing fluid lumen includes: two end connectors of the water-air flow lumen complex, and the end connectors of the water-air flow lumen complex include a water flow splitting end, a water flow confluence end and an air flow end. The water flow splitting ends and the air flow ends of the two end connectors of the water-air flow lumen complex are respectively connected to the two ends of the water-air flow lumen complex; the water pump and the fan are respectively arranged on the side of the splitting main pipes of the water pipe network and the air pipe network; the water flow confluence end and the air flow end of the end connector of the water-air flow lumen complex are respectively connected to the water pump and the fan by two of the fluid pipeline segments, and then the water pump and the fan are respectively connected to the splitting main pipes of the water pipe network and the air pipe network by two fluid pipeline segments, and then the confluence main pipe of the water pipe network is connected to the water flow confluence end of the end connector of the water-air flow lumen complex by one fluid pipeline segment, respectively forming a unidirectional open heat flow system for air circulation and a unidirectional closed heat flow system for water circulation.

[0017] In the above technical solution, the use of the water-air flow lumen complex for the heat-absorbing fluid lumen can improve the total heat absorption efficiency of the heat-absorbing fluid lumen, and the combination form of the water-air flow lumen complex + the water pipe network + the air pipe network can improve the construction efficiency of the large-scale ground heat island.

[0018] In a second aspect, an embodiment of the present application provides a method for constructing a ground heat island in a multi-span greenhouse. The ground heat island in the multi-span greenhouse includes a multi-span greenhouse, and the heat storage medium is the ground inside the multi-span greenhouse. A first type of distributed heat storage unit for the multi-span greenhouse is enabled, and the interior of the multi-span greenhouse is divided into multiple heat island units. One of the first type of distributed heat storage units for the multi-span greenhouse is arranged in each heat island unit. Each water flow multi-tube cavity complex of the first type of distributed heat storage unit for the multi-span greenhouse is arranged in the space of the heat island unit by connecting to the corresponding arch in the heat island unit. The fluid pipeline section is connected to each multi-tube cavity end connector by means of the truss of the heat island unit where it is located. The water pipe network is arranged in the ground of the heat island unit. The method for constructing the ground heat island in the multi-span greenhouse includes: when the water temperature in the water flow multi-tube cavity complex is higher than the water temperature in the water pipe network, the water pump is turned on to start the one-way closed heat flow system of the water circulation, and the high-temperature water in the water flow multi-tube cavity complex exchanges with the low-temperature water in the water pipe network, so as to transfer the heat energy in the high-temperature water to the ground of the heat island unit; when the water temperature in the water flow multi-tube cavity complex is equal to or lower than the water temperature in the water pipe network, the water pump is turned off to stop the one-way closed heat flow system of the water circulation, and the water in the water flow multi-tube cavity complex and the water in the water pipe network are stationary; over time, the heat energy in the ground near the water pipe network of the heat island unit transfers to the ground away from the water pipe network until the heat storage in the ground of the heat island unit within the preset range rises to the set value; over time, after the ground of each heat island unit in the multi-span greenhouse continuously stores heat and rises to the preset value, a ground heat island in the multi-span greenhouse is formed.

[0019] In the above technical solution, the excess heat energy in the space of the multi-span greenhouse during the day is transported to the ground by using water flow as the heat medium. Over time, a large amount of heat energy is accumulated in the soil of the ground of the multi-span greenhouse, increasing the soil temperature. When the multi-span greenhouse has a preset heat preservation function, even in winter, the soil temperature in the multi-span greenhouse can be maintained within the preset temperature range, effectively solving the problem of low ground temperature in the multi-span greenhouse in winter.

[0020] Thirdly, an embodiment of the present application provides a method for constructing a large-scale ground heat island in a multi-span greenhouse. The large-scale ground heat island in the multi-span greenhouse includes the multi-span greenhouse, and the heat storage medium is the ground inside the multi-span greenhouse. The second type of distributed heat storage unit in the multi-span greenhouse is enabled, and the interior of the multi-span greenhouse is divided into multiple heat island units. One of the second type of distributed heat storage units in the multi-span greenhouse is arranged in each heat island unit. Each semi-circular slender pipe of the second type of distributed heat storage unit in the multi-span greenhouse is arranged in the space of the heat island unit by connecting to the corresponding half arch frame of the heat island unit. The fluid pipeline section is connected to each single pipe cavity end connector by means of the truss of the heat island unit where it is located. The air pipe network is arranged in the ground of the heat island unit. The method for constructing the large-scale ground heat island in the multi-span greenhouse includes: when the temperature of the first air inlet hole is higher than the ground temperature near the air pipe network, the fan is turned on to start the one-way open heat flow system of air circulation, and the high-temperature air near the first air inlet hole exchanges heat with the low-temperature air in the air pipe network, so as to transfer the heat energy in the high-temperature air to the ground of the heat island unit; when the temperature of the first air inlet hole is equal to or lower than the ground temperature near the air pipe network, the fan is turned off to stop the one-way open heat flow system of air circulation, and the air near the first air inlet hole and the air in the air pipe network are stationary; over time, the heat energy in the ground near the air pipe network of the heat island unit is transferred to the ground away from the air pipe network until the heat storage in the ground of the heat island unit within the preset range rises to the set value; over time, after the ground of each heat island unit in the multi-span greenhouse continues to store heat and rise to the preset value, a large-scale ground heat island in the multi-span greenhouse is formed.

[0021] In the above technical solution, the excess heat energy in the space of the multi-span greenhouse during the day is transferred to the ground by the air flow heat medium. Over time, a large amount of heat energy is accumulated in the soil of the large-scale ground in the multi-span greenhouse, increasing the soil temperature. When the multi-span greenhouse has a preset heat preservation function, even in winter, the soil temperature in the multi-span greenhouse can be maintained within the preset temperature range, effectively solving the problem of low ground temperature in the multi-span greenhouse in winter.

[0022] Fourthly, the embodiments of the present application further provide a method for constructing a multi-span greenhouse ground heat island. The multi-span greenhouse ground heat island includes a multi-span greenhouse, and the heat storage medium is the ground inside the multi-span greenhouse. The third multi-span greenhouse distributed heat storage unit is enabled, and the interior of the multi-span greenhouse is divided into multiple heat island units. One of the third multi-span greenhouse distributed heat storage units is arranged in each heat island unit. Each water-air flow tube cavity complex of the third multi-span greenhouse distributed heat storage unit is arranged in the space of the heat island unit by connecting to the corresponding arch of the heat island unit. The fluid pipeline section is connected to the end connectors of each water-air flow tube cavity complex by means of the truss of the heat island unit. The water pipe network and the air pipe network are arranged in the ground of the heat island unit. The method for constructing the multi-span greenhouse ground heat island includes: when the temperature of the second air inlet is higher than the ground temperature near the air pipe network, the fan is turned on to start the one-way open heat flow system of air circulation, and the high-temperature air near the second air inlet exchanges heat with the low-temperature air in the air pipe network, so as to transfer the heat energy in the high-temperature air to the ground of the heat island unit; when the temperature of the second air inlet is equal to or lower than the ground temperature near the air pipe network, the fan is turned off to stop the one-way open heat flow system of air circulation, and the air near the second air inlet and the air in the air pipe network are static; when the water temperature in the water flow multi-tube cavity complex is higher than the water temperature in the water pipe network, the water pump is turned on to start the one-way closed heat flow system of water circulation, and the high-temperature water in the water flow multi-tube cavity complex exchanges heat with the low-temperature water in the water pipe network, so as to transfer the heat energy in the high-temperature water to the ground of the heat island unit; when the water temperature in the water flow multi-tube cavity complex is equal to or lower than the water temperature in the water pipe network, the water pump is turned off to stop the one-way closed heat flow system of water circulation, and the water in the water flow multi-tube cavity complex and the water in the water pipe network are static; over time, the heat energy in the ground near the air pipe network and the water pipe network of the heat island unit is transferred to the ground away from the air pipe network and the water pipe network until the heat storage in the ground of the heat island unit within the preset range rises to the set value; over time, after the ground of each heat island unit in the multi-span greenhouse continues to store heat and rise to the preset value, a multi-span greenhouse ground heat island is formed.

[0023] In the above technical solution, the excess heat energy in the space of the multi-span greenhouse during the day is transferred to the ground by using water flow heat medium and air flow heat medium. Over time, a large amount of heat energy is accumulated in the soil of the multi-span greenhouse ground, increasing the soil temperature. When the multi-span greenhouse has a preset heat preservation function, even in winter, the soil temperature in the multi-span greenhouse can be maintained within the preset temperature range, effectively solving the problem of low ground temperature in the multi-span greenhouse in winter.

[0024] Fifth aspect, an embodiment of the present application provides a method for constructing a large-scale ground heat island in a multi-span greenhouse. The large-scale ground heat island in the multi-span greenhouse includes the multi-span greenhouse, and the heat storage medium is the ground inside the multi-span greenhouse. The first type of distributed heat storage unit for multi-span greenhouses and the second type of distributed heat storage unit for multi-span greenhouses are enabled. The interior of the multi-span greenhouse is divided into multiple heat island units, and one first type of distributed heat storage unit for multi-span greenhouses and one second type of distributed heat storage unit for multi-span greenhouses are arranged in each heat island unit. The water flow multi-tube cavity complex of the first type of distributed heat storage unit for multi-span greenhouses is arranged in the space of this heat island unit by connecting to the arch corresponding to the heat island unit where it is located. Each semi-circular slender tube of the second type of distributed heat storage unit for multi-span greenhouses is arranged in the space of this heat island unit by connecting to the half arch corresponding to the heat island unit where it is located. The fluid pipeline section is connected to each multi-tube cavity end connector and each single-tube cavity end connector by means of the truss of the heat island unit where it is located. The water pipe network and the air pipe network are arranged in the ground of this heat island unit. The method for constructing the large-scale ground heat island in the multi-span greenhouse includes: when the temperature of the first air inlet is higher than the ground temperature near the air pipe network, turn on the fan to start the unidirectional open heat flow system of air circulation, and exchange the high-temperature air near the first air inlet with the low-temperature air in the air pipe network, so as to transfer the heat energy in the high-temperature air to the ground of this heat island unit; when the temperature of the first air inlet is equal to or lower than the ground temperature near the air pipe network, turn off the fan to stop the unidirectional open heat flow system of air circulation, and the air near the first air inlet and the air in the air pipe network are static; when the water temperature in the water flow multi-tube cavity complex is higher than the water temperature in the water pipe network, turn on the water pump to start the unidirectional closed heat flow system of water circulation, and exchange the high-temperature water in the water flow multi-tube cavity complex with the low-temperature water in the water pipe network, so as to transfer the heat energy in the high-temperature water to the ground of this heat island unit; when the water temperature in the water flow multi-tube cavity complex is equal to or lower than the water temperature in the water pipe network, turn off the water pump to stop the unidirectional closed heat flow system of water circulation, and the water in the water flow multi-tube cavity complex and the water in the water pipe network are static; over time, the heat energy in the ground near the air pipe network and the water pipe network of this heat island unit is transferred to the ground away from the air pipe network and the water pipe network until the heat storage in the ground within the preset range of this heat island unit rises to the set value; over time, after the ground of each heat island unit in the multi-span greenhouse continuously stores heat and rises to the preset value, a large-scale ground heat island in the multi-span greenhouse is formed.

[0025] In the above technical solution, the excess heat energy in the space of the multi-span greenhouse during the day is transported to the ground by using water flow heat medium and air flow heat medium. Over time, a large amount of heat energy is accumulated in the soil of the large-scale ground in the multi-span greenhouse, increasing the soil temperature. When the multi-span greenhouse has a preset heat preservation function, even in winter, the soil temperature in the multi-span greenhouse can be maintained within the preset temperature range, effectively solving the problem of low ground temperature in the multi-span greenhouse in winter.

[0026] Sixth aspect, an embodiment of the present application provides a method for using a multi-span greenhouse ground heat island. Based on the method for constructing a multi-span greenhouse ground heat island provided in the third aspect, the fourth aspect, or the fifth aspect, an air valve is provided in the fluid pipeline section in front of the fan, and a third air inlet hole is provided between the air valve and the fan. The method for using a multi-span greenhouse ground heat island includes: when the preset air temperature near the third air inlet hole is lower than the ground heat island ground temperature near the air pipe network, the fan is turned on, so that the one-way open heat flow system of air circulation is started. Cold air enters the air pipe network from the third air inlet hole through the shunt main pipe of the air pipe network. After the cold air is heated by the heat energy in the heat island unit of the ground heat island where it is located in the air pipe network, it is discharged from the air outlet hole of the confluence main pipe of the air pipe network for heating the space air temperature of the heat island unit where it is located; when the preset air temperature near the third air inlet hole is higher than or equal to the ground heat island ground temperature near the air pipe network, the fan is turned off, so that the one-way open heat flow system of air circulation stops, and the air near the third air inlet hole and the air near the air outlet hole of the confluence main pipe of the air pipe network are stationary; the heat energy far from the air pipe network in the heat island unit of the ground heat island where it is located transfers to the vicinity of the air pipe network for heating the air in the air pipe network.

[0027] In the above technical solution, for a multi-span greenhouse for plant cultivation, when continuous cloudy days occur in winter, the heat energy in the ground heat island is transferred to above the ground by using air flow as the heat medium, which is used to relieve the decrease in the air temperature above the ground inside the multi-span greenhouse and can prevent plants from suffering from cold damage. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required for the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0029] Figure 1 A side view schematic diagram of a one-way closed heat flow system formed by the first type of distributed heat storage unit for multi-span greenhouses provided by the embodiment of the present application;

[0030] Figure 2 A top view schematic diagram of a heat storage component unit of the first type of distributed heat storage unit for multi-span greenhouses provided by the embodiment of the present application;

[0031] Figure 3 A bottom view schematic diagram of a heat absorption component unit of the first type of distributed heat storage unit for multi-span greenhouses provided by the embodiment of the present application;

[0032] Figure 4Schematic side view of a one-way open heat flow system formed by the second type of multi-span greenhouse distributed heat storage unit provided by the embodiments of the present application;

[0033] Figure 5 Top view schematic of the heat storage component unit of the second type of multi-span greenhouse distributed heat storage unit provided by the embodiments of the present application;

[0034] Figure 6 Bottom view schematic of the heat absorption component unit of the second type of multi-span greenhouse distributed heat storage unit provided by the embodiments of the present application;

[0035] Figure 7 Combined side view schematic of a one-way closed heat flow system formed by the first type of multi-span greenhouse distributed heat storage unit and a one-way open heat flow system formed by the second type of multi-span greenhouse distributed heat storage unit provided by the embodiments of the present application;

[0036] Figure 8 Schematic side view of a "one-way open + one-way closed" integrated heat flow system formed by the third type of multi-span greenhouse distributed heat storage unit provided by the embodiments of the present application;

[0037] Figure 9 Axonometric view of a one-way closed heat flow system formed by the first type of multi-span greenhouse distributed heat storage unit provided by the embodiments of the present application;

[0038] Figure 10 Axonometric view of a one-way open heat flow system formed by the second type of multi-span greenhouse distributed heat storage unit provided by the embodiments of the present application;

[0039] Figure 11 Shows a cross-sectional schematic of an elongated tube bundle composed of tube strips and a plate-shaped multi-tube cavity end connector used in combination with the elongated tube bundle;

[0040] Figure 12 Shows a cross-sectional schematic of an elongated tube bundle composed of tube grooves and a groove-shaped multi-tube cavity end connector used in combination with the elongated tube bundle;

[0041] Figure 13 Shows a cross-sectional schematic of an elongated tube bundle composed of tubes;

[0042] Figure 14 Shows a cross-sectional schematic of an end connector of a water-air flow tube cavity complex.

[0043] Icons: 1 - Multi-span greenhouse distributed heat storage unit; 100 - Heat absorption component unit; 101 - Heat absorption fluid lumen; 110 - Water flow multi-lumen complex; 111 - Multi-lumen end connector; 112 - Shunt end; 113 - Confluence end; 120 - Air flow single lumen; 121 - Semi-circular slender tube; 122 - Single lumen end connector; 123 - First air inlet; 130 - Slender tube bundle; 131 - Tube row belt; 132 - Tube row groove; 133 - Tube row tube; 134 - Tube wall; 135 - Tube wing; 136 - Plate-shaped multi-lumen end connector; 137 - Groove-shaped multi-lumen end connector; 138 - Tubular multi-lumen end connector; 139 - Flow channel; 140 - Water-air flow lumen complex; 141 - Second air inlet; 142 - Water-air flow lumen complex end connector; 143 - Water flow shunt end; 144 - Water flow confluence end; 145 - Air flow end; 200 - Heat storage component unit; 201 - Heat absorption and release fluid pipe; 202 - Slender pipe network; 203 - Slender tube; 204 - Shunt main pipe; 205 - Confluence main pipe; 210 - Water pipe network; 220 - Air pipe network; 221 - Air outlet; 300 - Driving component; 301 - Fluid pipeline pump; 302 - Fluid pipeline section; 303 - Third air inlet; 304 - Air valve; 310 - Water pump; 320 - Fan; 400 - Fluid heat medium; 401 - Heat storage medium; 402 - Direction of the construction operation process of the urban heat island; 410 - Water flow heat medium; 420 - Air flow heat medium; 500 - Multi-span greenhouse; 501 - Arch frame; 502 - Truss; 503 - Middle column; 504 - Heat island unit; 505 - Exterior facade; 506 - Roof; 600 - Ground; 601 - Ground heat island unit; 700 - Heat flow system; 701 - Unidirectional closed heat flow system; 702 - Unidirectional open heat flow system. Detailed implementation manners

[0044] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are some, but not all, of the embodiments of this application. Usually, the components of the embodiments of this application described and illustrated herein can be arranged and designed in various different configurations.

[0045] Therefore, the following detailed description of the embodiments of this application provided in the drawings is not intended to limit the scope of this application that is claimed, but merely represents selected embodiments of this application. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of this application.

[0046] It should be noted that, without conflict, the embodiments in this application and the features in the embodiments can be combined with each other.

[0047] It should be noted that like reference numerals and letters refer to like items in the following figures. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0048] In the description of the embodiments of the present application, it should be noted that the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the figures, or the orientation or positional relationship in which the product of this application is usually placed during use, or the orientation or positional relationship commonly understood by those skilled in the art. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application. In addition, the terms "first", "second", "third", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0049] As Figures 1 - 14 shown, the multi-span greenhouse distributed heat storage unit 1 is used for performing heat absorption and storage operations within the range of the preset heat island unit 504 inside the multi-span greenhouse 500. The multi-span greenhouse distributed heat storage unit 1 includes a heat absorption component unit 100, a heat storage component unit 200, and a driving component 300. The heat absorption component unit 100 includes a plurality of heat absorption fluid cavities 101, and the heat absorption fluid cavities 101 are used for passing through the fluid heat medium 400. The plurality of heat absorption fluid cavities 101 are arranged at intervals in the space of the preset heat island unit 504 inside the multi-span greenhouse 500. The heat storage component unit 200 includes a plurality of heat absorption and release fluid pipes 201, and the plurality of heat absorption and release fluid pipes 201 are arranged in the heat storage medium 401 of the preset heat island unit 504 inside the multi-span greenhouse 500. The driving component 300 includes a fluid pipeline pump 301 and fluid pipeline segments 302. The fluid pipeline pump 301 is arranged between the heat absorption component unit 100 and the heat storage component unit 200. At least two fluid pipeline segments 302 are arranged at both ends of the fluid pipeline pump 301, respectively connecting one end of the plurality of heat absorption fluid cavities 101 of the heat absorption component unit 100 and one end of the plurality of heat absorption and release fluid pipes 201 of the heat storage component unit 200 to the fluid pipeline pump 301, thereby forming a heat flow system 700 of the fluid heat medium 400 between the space of the preset heat island unit 504 inside the multi-span greenhouse 500 and the heat storage medium 401.

[0050] It should be noted that the multi-span greenhouse distributed heat storage unit 1 provided by the present invention is arranged in the internal space of the multi-span greenhouse 500 and the corresponding heat storage medium 401 in a distributed manner to construct the heat island of the multi-span greenhouse 500. The large-scale heat island of the multi-span greenhouse can be understood as the main body of the production site where a preset amount of thermal energy is accumulated in the multi-span greenhouse, and the substance constituting the main body of the production site is the heat storage medium 401. For example, for plant cultivation, the main body of the production site is the ground in the multi-span greenhouse, and the soil that makes up the ground is the heat storage medium 401; for aquaculture, the main body of the production site is the aquaculture water body set on the land in the multi-span greenhouse, and the aquaculture water body is the heat storage medium 401; for dairy farming, the main body of the production site is the cowshed set on the land in the multi-span greenhouse, and the concrete that makes up the hard foundation of the cowshed is the heat storage medium 401. The internal space of the multi-span greenhouse 500 is divided into multiple heat island units 504, and a multi-span greenhouse distributed heat storage unit 1 provided by the present invention is correspondingly arranged in one heat island unit 504, and heat absorption - heat storage, or heat absorption - heat storage - heat release is only carried out in the partial space of this heat island unit 504 and the corresponding partial ground 600 (in the multi-span greenhouse 500 for plant cultivation) or partial water body (in the multi-span greenhouse 500 for aquaculture) or partial concrete structure (in the multi-span greenhouse 500 for dairy farming). The soil of the ground 600, aquaculture water body, or concrete floor of the cowshed in the corresponding multi-span greenhouse 500 becomes the heat storage medium 401 of the preset heat island unit 504.

[0051] The heat island units 504 of the multi-span greenhouse 500 can be arbitrarily divided, but there are the following two preferred division methods:

[0052] For the multi-span greenhouse 500 composed of single-layer trusses 502, the preferred division scheme of the heat island unit 504 described in this application is to take the space between two adjacent trusses 502 and the ground 600 as one heat island unit 504.

[0053] For the multi-span greenhouse 500 composed of double-layer trusses 502, the preferred division scheme of the heat island unit 504 described in this application is to take the space surrounded by four adjacent trusses 502 and the ground 600 as one heat island unit 504.

[0054] Simply put, it is to take the space between four adjacent middle columns 503 in the multi-span greenhouse 500 and the ground 600 as one heat island unit 504.

[0055] The advantage of such division is that the structural composition and specifications of a multi-span greenhouse distributed heat storage unit 1 provided by the present invention can be designed according to the length of a single truss 502 of the multi-span greenhouse 500 (or the interval distance between the middle columns 503) and the size of the established space surrounded by the trusses 502.

[0056] The connection between pipelines or lumens described in this application refers to a connected connection through which fluids can pass.

[0057] To facilitate the matching of a multi-span greenhouse distributed heat storage unit 1 provided by the present invention with a heat island unit 504, the multi-span greenhouse distributed heat storage unit 1 provided by the present invention is composed of a heat absorption component unit 100, a heat storage component unit 200, and a matching drive component 300.

[0058] The heat absorption component unit 100, the heat storage component unit 200, and the matching drive component 300 of the multi-span greenhouse distributed heat storage unit 1 provided by the present invention can be independently arranged in the space of the heat island unit 504 of the multi-span greenhouse 500 and in the heat storage medium 401 relying on the strength of their bodies.

[0059] The heat absorption component unit 100, the heat storage component unit 200, and the matching drive component 300 of the multi-span greenhouse distributed heat storage unit 1 provided by the present invention can be arranged in the space of the heat island unit 504 of the multi-span greenhouse 500 and in the heat storage medium 401 with the support of the structure of the multi-span greenhouse 500. The advantages of arranging the heat absorption component unit 100, the heat storage component unit 200, and the matching drive component 300 with the support of the structure of the multi-span greenhouse 500 are as follows: First, a plurality of heat absorption fluid lumens 101 of the heat absorption component unit 100 can be arranged on the arch frames 501 that make up the structure of the multi-span greenhouse 500, and fluid pipeline segments 302 can be arranged on the trusses 502 that make up the structure of the multi-span greenhouse 500, thus avoiding shading the ground of the heat island unit 504 when setting them up separately; Second, the chamber walls of the plurality of heat absorption fluid lumens 101 that make up the heat absorption component unit 100 and the pipe walls of the plurality of heat absorption and heat release fluid pipes 201 that make up the heat storage component unit 200 can be set as thin walls to reduce the thermal resistance and improve the heat exchange efficiency.

[0060] The working process of the multi-span greenhouse distributed heat storage unit 1 provided by the present invention is directional, that is, the flow of the fluid heat medium 400 within the structure of the multi-span greenhouse distributed heat storage unit 1 provided by the present invention is directional.

[0061] In the interior space of the multi-span greenhouse 500, hot air accumulates in the upper part of the space during sunny days. The heat absorption component unit 100 is arranged to work in the upper part of the preset heat island unit 504 space. The function of the heat absorption component unit 100 is to transfer the heat energy in the hot air to the water in the heat absorption fluid lumen 101, or directly suck the hot air into the heat absorption fluid lumen 101. The heat absorption fluid lumen 101 is arranged along the inner contour of the roof 506 structure of the multi-span greenhouse 500. The preferred solution is to arrange it along the arch frames 501 that support the enclosure structure of the roof 506.

[0062] Once the interior of the multi-span greenhouse 500 is used for biological production (planting or breeding), the ground 600 or the lower part of the aquaculture water body cannot directly receive solar radiation to obtain heat for warming. For plant planting, the development and nutrition absorption of plant roots require a suitable temperature environment for support. For aquaculture, aquatic animals require the aquaculture water body temperature in the aquaculture area to be uniform. For cattle and sheep breeding, cattle and sheep need to step on / lie on a warm floor / bed.

[0063] The function of the multiple heat absorption and release fluid pipes 201 of the heat storage component unit 200 is that the fluid pipe can both release heat into the ground 600 or the aquaculture water body of the heat island unit 504 where it is located, and can also absorb heat from the ground 600 or the aquaculture water body of the heat island unit 504 where it is located. Releasing heat into the ground 600 / aquaculture water body is the heat storage work, and the heat energy in the ground 600 / aquaculture water body is increasing, which is the process of constructing the heat island of the multi-span greenhouse 500; absorbing heat from the ground 600 / aquaculture water body is the heat utilization work, and the heat energy in the ground 600 or the aquaculture water body is decreasing, which is the process of utilizing the heat island of the multi-span greenhouse 500.

[0064] The soil of the ground 600 and the static aquaculture water body are both poor conductors of heat. When a point in the ground 600 or the aquaculture water body is enriched with heat energy and warms up, the speed at which the heat energy transfers to the surrounding ground 600 or aquaculture water body away from this point is very slow. The multiple heat absorption and release fluid pipes 201 in the heat storage component unit 200 are effectively spaced. The value of the effective spacing distance of each heat absorption and release fluid pipe 201 arranged at intervals in the ground 600 or the aquaculture water body is determined according to the distance of the effective transfer of the heat energy in the ground 600 or the aquaculture water body per unit time.

[0065] If the spacing distance is too large, even if there is enriched heat energy in the ground 600 or the aquaculture water body far from the heat absorption and release fluid pipe 201, it is too far away to help, and this heat energy cannot be transferred to the vicinity of the heat absorption and release fluid pipe 201 within the preset time to heat the fluid heat medium 400 in the heat absorption and release fluid pipe 201, so as to relieve the air cooling above the ground 600 of the heat island unit 504 where it is located.

[0066] Similarly, if the spacing distance is too large, the heat energy enriched in the ground 600 / aquaculture water body near the heat absorption and release fluid pipe 201 cannot be transferred to the ground 600 / aquaculture water body far from the heat absorption and release fluid pipe 201 in time. Even if the fluid heat medium 400 in the heat absorption and release fluid pipe 201 is rich in heat energy, this heat energy cannot be transferred out of the heat absorption and release fluid pipe 201 within the preset time period, resulting in a reduction in the heat absorption - heat storage - heat release working efficiency of the distributed heat storage unit 1 of the multi-span greenhouse provided by the present invention.

[0067] In the multi-span greenhouse 500, due to different soil types and soil compactness in the ground 600, the transfer rate of heat energy in the soil is different. The higher the air content in the soil, the slower the transfer rate of heat energy in the soil. The more air in the soil within the preset range of the heat absorption and release fluid pipe 201 is discharged, the higher the heat exchange efficiency between the soil and the heat absorption and release fluid pipe 201. When installing the heat absorption and release fluid pipe 201 in the ground 600, taking watering and rolling compaction measures for the soil within the preset range of the heat absorption and release fluid pipe 201 can improve the heat exchange efficiency between the soil and the heat absorption and release fluid pipe 201.

[0068] In some embodiments, the heat absorption and release fluid pipe 201 includes an elongated pipe network 202. The elongated pipe network 202 includes a plurality of elongated pipes 203 arranged at intervals, as well as a shunt main pipe 204 and a confluence main pipe 205 connected in parallel at both ends of the elongated pipes 203; at least the middle part of the elongated pipes 203 is buried in the heat storage medium 401. The shunt main pipe 204 is connected to the fluid pipe pump 301 through a fluid pipe section 302, and the confluence main pipe 205 is connected to one end of a plurality of heat absorption fluid pipe cavities 101 of the heat absorption component unit 100 through a fluid pipe section 302, for forming a one-way closed heat flow system 701; alternatively, the confluence main pipe 205 communicates with the space of the multi-span greenhouse 500, for forming a one-way open heat flow system 702.

[0069] It should be noted that the distributed heat storage unit 1 of the multi-span greenhouse provided by the present invention is used within the preset heat island unit 504 range inside the multi-span greenhouse 500. The heat absorption and release fluid pipe 201 is also arranged within this range. Correspondingly, the elongated pipe network 202 is also restricted to be arranged within this range, that is, the pipe length of the elongated pipe 203 is less than or equal to the distance between the adjacent truss 502 structures of the heat island unit 504 where it is located. The elongated pipe 203 refers to a pipe fitting whose pipe diameter is much smaller than the pipe length. In specific practice, the pipe length of the elongated pipe 203 is about 10 meters, and the pipe diameter is within 10 centimeters. The preferred scheme is within 5 centimeters.

[0070] The smaller the pipe diameter of the elongated pipe 203, the smaller the interval distance between the elongated pipes 203 in the elongated pipe network 202 can be set. The more the number of elongated pipes 203 in the elongated pipe network 202 in the heat storage medium 401 of a heat island unit 504 is set. Correspondingly, the total surface area of the pipe wall 134 of an elongated pipe network 202 is larger, and the heat exchange efficiency of the elongated pipe network 202 through the pipe wall 134 is higher.

[0071] The smaller the diameter of the slender tube 203, the easier it is for the fluid heat medium 400 inside the tube to absorb heat and increase in temperature or release heat and decrease in temperature. The fluid heat medium 400 in the slender tube 203 can quickly pass through the slender tube 203 under the action of the driving assembly 300 and the fluid pipeline pump 301, so that the one-way closed heat flow system 701, or the one-way open heat flow system 702 can operate quickly, thereby improving the heat absorption - heat storage - heat release function of the multi-span greenhouse distributed heat storage unit 1.

[0072] The heat absorption - heat storage - heat release operation process of the multi-span greenhouse distributed heat storage unit 1 provided by the present invention is directional. A plurality of slender tubes 203 of equal length are arranged in parallel, and both ends of each slender tube 203 are connected in parallel by a pipe section. The fluid heat medium 400 is dispersed into the pipe sections of each slender tube 203 as the shunt main pipe 204, and the pipe section into which the fluid heat medium 400 in each slender tube 203 converges is the confluence main pipe 205. The fluid pipeline pump 301 is arranged on the side of the shunt main pipe 204. The fluid heat medium 400 in the slender pipe network 202 in the heat storage medium 401 of the heat island unit 504 is under the positive pressure from the fluid pipeline pump 301, and the fluid heat medium 400 in the heat absorption fluid pipe cavity 101 in the above-ground space of the heat island unit 504 is under the negative pressure from the fluid pipeline pump 301.

[0073] In some embodiments, the multi-span greenhouse distributed heat storage unit 1 is the first type of multi-span greenhouse distributed heat storage unit 1. The heat absorption fluid pipe cavity 101 is a water flow multi-pipe cavity complex 110 composed of slender tube bundles 130, the slender pipe network 202 is a water pipe network 210, the fluid pipeline pump 301 is a water pump 310, and the water pump 310 is arranged on the side of the shunt main pipe 204 of the water pipe network 210; the water flow multi-pipe cavity complex 110 includes: two multi-pipe cavity end connectors 111, the multi-pipe cavity end connector 111 includes a shunt end 112 and a confluence end 113, the shunt ends 112 of the two multi-pipe cavity end connectors 111 are respectively connected to the two ends of the water flow multi-pipe cavity complex 110, the confluence ends 113 of the multi-pipe cavity end connectors 111 of the water flow multi-pipe cavity complex 110 are connected to the water pump 310 by a fluid pipeline section 302, the water pump 310 is connected to the shunt main pipe 204 of the water pipe network 210 by a fluid pipeline section 302, and the confluence main pipe 205 of the water pipe network 210 is connected to the confluence end 113 of the multi-pipe cavity end connector 111 of the water flow multi-pipe cavity complex 110 by a fluid pipeline section 302, forming a one-way closed heat flow system 701 for water circulation.

[0074] It should be noted that the cross-section of the water flow multi-lumen complex 110 is in the shape of a row of pipe belts 131, or in the shape of a row of pipe grooves 132, or in the shape of a row of pipes 133, all of which are composed of slender pipe walls 134 and pipe wings 135. The pipe wings 135 connect the pipe walls 134 together to form a slender pipe bundle 130. The cross-section of the slender pipe bundle 130 is multi-lumen-shaped, and the pipe walls 134 forming each lumen are connected by the pipe wings 135. The one-way closed heat flow system 701 of the water cycle actually absorbs the heat energy of the air in the upper part of the space of the heat island unit 504 using the principle of heat conduction. The pipe wings 135 are used to connect the walls of the slender pipes 203 and increase the heat exchange area.

[0075] The connection between the pipe wall 134 and the pipe wing 135 can be an inseparable integral connection, that is, a raw material is directly extruded through an extrusion molding device to form a slender pipe bundle 130 including a plurality of slender lumens and pipe wings 135 connecting the walls of the slender lumens.

[0076] The pipe wings 135 connect the pipe walls 134 into a plate shape, and the long multi-lumen plate is the row of pipe belts 131. Correspondingly, the multi-lumen end connector 111 is a plate-shaped multi-lumen end connector 136 used in cooperation with the row of pipe belts 131.

[0077] The pipe wings 135 connect the pipe walls 134 into a groove, and the long multi-lumen groove is the row of pipe grooves 132. Correspondingly, the multi-lumen end connector 111 is a groove-shaped multi-lumen end connector 137 used in cooperation with the row of pipe grooves 132.

[0078] The pipe wings 135 connect the pipe walls 134 into a closed ring, and the long multi-lumen is the row of pipes 133. Correspondingly, the multi-lumen end connector 111 is a tubular multi-lumen end connector 138 used in cooperation with the row of pipes 133.

[0079] The multi-lumen end connector 111 is directional. The confluence end 113 of the multi-lumen end connector 111 includes a flow channel 139, and the diversion end 112 includes a plurality of flow channels 139. One flow channel 139 of the confluence end 113 communicates with the plurality of flow channels 139 of the diversion end 112, and each flow channel 139 of the diversion end 112 is matched and docked with each lumen of the water flow multi-lumen complex 110.

[0080] The connection between the pipe wall 134 and the pipe wing 135 can be a separable movable connection, that is, a plurality of slender pipes 203 are connected together by a connector. For example, a plurality of plate structures with holes are arranged at intervals, and each slender pipe 203 is inserted into the holes to form a slender pipe bundle 130.

[0081] The slender tube bundle 130 means that the length of the tube bundle is much greater than the diameter of each slender tube cavity. In specific applications, the slender tube bundle 130 is connected to the arch 501 of the multi-span greenhouse 500 for use. In order to reduce the shading of the ground of the multi-span greenhouse 500 by the slender tube bundle 130, the shape of the slender tube bundle 130 is close to or smaller than the shape of the arch 501.

[0082] The unidirectional closed heat flow system 701 means that, driven by the water pump 310, the water flow in the multi-tube cavity complex 110 absorbs heat in the upper part of the space of the heat island unit 504, causing the water temperature in the tube cavity to rise. The high-temperature water passes through the water pump 310 under the suction negative pressure of the water pump 310 and is positively dispersed from the shunt main pipe 204 of the water pipe network 210 to each slender tube 203 of the water pipe network 210, and then returns to the multi-tube cavity complex 110 through the confluence main pipe 205 of the water pipe network 210 and the fluid pipeline section 302. When the high-temperature water flows through the water pipe network 210, it transfers heat energy to the heat storage medium 401 at the location.

[0083] The water flow heat flow system 700 composed of the multi-tube cavity complex 110 of water flow can also be set to be a two-way cycle. The multi-tube cavity complex 110 of water flow is set as a semi-circular slender tube bundle 130 of water flow. The semi-circular slender tube bundle 130 of water flow is arranged on one side of the arch 501. The end connector is connected to the lower bottom end of the semi-circular slender tube bundle 130 of water flow and is connected to the shunt main pipe 204 of the water pipe network 210 through the fluid pipeline section 302 and the water pump 310. Air valves 304 are provided on both the upper bottom end of the semi-circular slender tube bundle 130 of water flow and the confluence main pipe 205 of the water pipe network 210. The water pump 310 pumps the low-temperature water in the water pipe network 210 into the multi-tube cavity complex 110 of water flow to absorb heat and increase the temperature. After the temperature rises, it flows back to the water pipe network 210 by its own weight to release heat to the heat storage medium 401 at the location. After the temperature drops, the water pump 310 is started again to pump it into the multi-tube cavity complex 110 of water flow to absorb heat and increase the temperature again. In this way, it circulates repeatedly.

[0084] As Figures 1 - 3 、 Figure 9 shown, in a 4-span multi-span greenhouse 500, 4 columns of heat island units 504 are set according to the spans (as Figure 1 shown), and each column of heat island units 504 further includes 4 heat island units 504 ( Figure 2 Figure 3As shown, one first type of multi-span greenhouse distributed heat storage unit 1 is arranged in each heat island unit 504. A one-way closed heat flow system 701 is formed in the heat island unit 504 by this unit. A total of 16 heat island units 504, 16 first type of multi-span greenhouse distributed heat storage units 1, and 16 one-way closed heat flow systems 701 are arranged in this multi-span greenhouse 500. After the 16 first type of multi-span greenhouse distributed heat storage units 1 continuously absorb and store heat, heat can be stored in the ground 600 of the 16 heat island units 504 to form 16 ground heat island units 601. The 16 ground heat island units 601 together constitute the ground heat island of the multi-span greenhouse 500.

[0085] The fluid heat medium 400 used in the first type of multi-span greenhouse distributed heat storage unit 1 is water flow heat medium 410. Each heat absorption fluid cavity 101 of the heat absorption component unit 100 of this unit is a water flow multi-tube cavity complex 110 composed of slender tube bundles 130. The water flow multi-tube cavity complex 110 is arranged along the arch frame 501 that constitutes the structure of the multi-span greenhouse 500. In specific practice, the pipe wall 134 that constitutes the water flow multi-tube cavity complex 110 is a thin wall to facilitate improving the heat exchange efficiency. The body strength of the thin-wall water flow multi-tube cavity complex 110 is limited. The preferred solution is to connect it to the arch frame 501 and arrange it at the position of the hot air enriched in the upper part of the space of the heat island unit 504 by means of the structural strength of the arch frame 501. At the same time, the shading of the ground is minimized. Demonstratively, the spacing of the arch frames 501 of the multi-span greenhouse 500 is 100 cm, and the water flow multi-tube cavity complexes 110 are also arranged at an interval of 100 cm in the upper part of the space of the heat island unit 504. Each water flow multi-tube cavity complex 110 absorbs the heat energy in the hot air near it to heat the water flow heat medium 410 inside it to the set temperature.

[0086] The arch frame 501 of the multi-span greenhouse 500 is directly supported by the truss 502. The truss 502 is located at the two bottom ends of the arch frame 501. The drive component 300 that constitutes the first type of multi-span greenhouse distributed heat storage unit 1 includes a fluid pipeline pump 301 and a fluid pipeline section 302. At least one fluid pipeline section 302 is arranged on one side of the truss 502. Each of the two ends of each water flow multi-tube cavity complex 110 is connected to the corresponding position of the fluid pipeline section 302 through a multi-tube cavity end connector 111. The two ends of each water flow multi-tube cavity complex 110 are connected in parallel with the two fluid pipeline sections 302.

[0087] The fluid pipeline pump 301 of the drive component 300 is a water pump 310. The preferred solution is a pipeline circulation pump.

[0088] The multiple heat absorption and release fluid pipes 201 of the heat storage component unit 200 used in the first type of multi-span greenhouse distributed heat storage unit 1 are slender pipe networks 202, which are a kind of water pipe network 210, arranged in the ground 600 of the heat island unit 504 preset inside the multi-span greenhouse 500. The ground 600 is the heat storage medium 401. If the multi-span greenhouse 500 is a multi-span greenhouse for aquaculture, the water pipe network 210 can also be arranged in the aquaculture water body of the fish pond. In this case, the heat storage medium 401 is the aquaculture water body. If the multi-span greenhouse 500 is a multi-span greenhouse for raising cattle and sheep, the water pipe network 210 can also be arranged in the floor / lying bed of the cattle and sheep shed.

[0089] The slender pipe network 202 that makes up the water pipe network 210 includes multiple slender pipes 203 arranged in parallel and a shunt main pipe 204 and a confluence main pipe 205 connected in parallel at both ends of each slender pipe 203. The fluid pipe segments 302 connected to the two ends of each water flow multi-tube cavity complex 110 are respectively connected to the corresponding shunt main pipe 204 and confluence main pipe 205, forming a one-way closed heat flow system 701.

[0090] In this one-way closed heat flow system 701, the water pump 310 can be located in any one of the two fluid pipe segments 302. In Figures 1 - 3 , the water pumps 310 of each column of the heat island units 504 are all arranged near the middle column 503 far from the outer facade 505 of the multi-span greenhouse 500, aiming to make the water flow heat medium 410 in the direction of the ground heat island construction operation process 402 avoid flowing through the relatively low-temperature outer facade 505, so as to avoid large heat loss during the construction of the ground heat island.

[0091] In specific practice, the interval distance of the slender pipes 203 of the slender pipe network 202 is much smaller than the interval distance of the slender pipe bundle 130 (as Figure 9 shown), aiming to improve the heat exchange efficiency between the poor heat conductor soil and the slender pipes 203.

[0092] In some embodiments, the multi-span greenhouse distributed heat storage unit 1 is the second type of multi-span greenhouse distributed heat storage unit 1. The heat-absorbing fluid cavity 101 is an air flow single cavity 120 composed of slender pipes. The air flow single cavity 120 is a semi-circular arc slender pipe 121. The upper part of the semi-circular arc slender pipe 121 is provided with a first air inlet hole 123 of the air flow single cavity 120. The slender pipe network 202 is an air pipe network 220. The confluence main pipe 205 of the air pipe network 220 is provided with an air outlet hole 221. The fluid pipe pump 301 is a fan 320. The fan 320 is arranged on the side of the diversion main pipe 204 of the semi-circular arc slender pipe 121 and the air pipe network 220. The air flow single cavity 120 includes a single cavity end connector 122. The single cavity end connector 122 is connected to the lower bottom end of the semi-circular arc slender pipe 121. The single cavity end connector 122 is connected to the fan 320 by a fluid pipe section 302, and the fan 320 is connected to the diversion main pipe 204 of the air pipe network 220 by a fluid pipe section 302, forming a one-way open heat flow system 702 for air circulation.

[0093] It should be noted that the one-way open heat flow system 702 for air circulation actually directly transfers the hot air in the upper part of the heat island unit 504 space to the air pipe network 220 by means of air convection. The greater the flow rate of the hot air entering the air pipe network 220, the more heat energy is transferred to the heat storage medium 401. In order to reduce the air flow resistance, the heat-absorbing fluid cavity 101 is set as the air flow single cavity 120. The hot air inside the multi-span greenhouse 500 is gathered in the upper part of the space. The semi-circular arc slender pipe 121 is arranged along the half arch 501. Its first air inlet hole 123 is arranged near the highest position of the arch 501 along with the semi-circular arc slender pipe 121. After the fan 320 is started, the hot air in the upper part of the heat island unit 504 space is sucked into the first air inlet hole 123 under negative pressure and then enters the semi-circular arc slender pipe 121. After passing through the fan 320, it is sent into the air pipe network 220 of the heat storage medium 401 under positive pressure and then discharged from the air outlet hole 221 under positive pressure. During the process of the hot air passing through the air pipe network 220, the heat energy is transferred to the heat storage medium 401 at the location, forming a one-way open heat flow system 702.

[0094] As Figures 4 - 6 、 Figure 10 shown, in a 4-span multi-span greenhouse 500, 4 columns of heat island units 504 are arranged by span (as Figure 4 shown), and each column of heat island units 504 further includes 4 heat island units 504 ( Figure 5 Figure 6As shown in the figure, one second type of multi-span greenhouse distributed heat storage unit 1 is arranged in each heat island unit 504. The unit forms a one-way open heat flow system 702 in the heat island unit 504. A total of 16 heat island units 504, 16 second type of multi-span greenhouse distributed heat storage units 1, and 16 one-way open heat flow systems 702 are arranged in this multi-span greenhouse 500. After the 16 second type of multi-span greenhouse distributed heat storage units 1 continuously absorb and store heat, heat can be stored in the ground 600 of the 16 heat island units 504 to form 16 ground heat island units 601. The 16 ground heat island units 601 together form the ground heat island of the multi-span greenhouse 500.

[0095] The fluid heat medium 400 used in the second type of multi-span greenhouse distributed heat storage unit 1 is the air flow heat medium 420. Each heat absorption fluid cavity 101 of the heat absorption component unit 100 of the unit includes an air flow single cavity 120. A plurality of air flow single cavities 120 are arranged along the arch frame 501 that constitutes the structure of the multi-span greenhouse 500. In specific practice, the pipe wall 134 that constitutes the air flow single cavity 120 is a thin wall to facilitate improving the heat exchange efficiency. The body strength of the thin-walled air flow single cavity 120 is limited. The preferred solution is to connect it to the arch frame 501 and arrange it at the position where hot air is concentrated in the upper part of the space of the heat island unit 504 by means of the structural strength of the arch frame 501. At the same time, the shading of the ground is minimized. Exemplarily, the spacing of the arch frames 501 of the multi-span greenhouse 500 is 100 cm, and the air flow single cavities 120 are also arranged at an interval of 100 cm in the upper part of the space of the heat island unit 504. Each air flow single cavity 120 absorbs the hot air nearby and directly transfers the hot air to the ground 600 for heat exchange.

[0096] The arch frame 501 of the multi-span greenhouse 500 is directly supported by the truss 502. The truss 502 is located at the two bottom ends of the arch frame 501. The driving component 300 that constitutes the second type of multi-span greenhouse distributed heat storage unit 1 includes a fluid pipeline pump 301 and a fluid pipeline section 302. A fluid pipeline section 302 is arranged on one side of the truss 502. Each air flow single cavity 120 is a semi-circular slender tube 121 and is arranged on the half arch frame 501 on the side where the fluid pipeline section 302 is arranged. A first air inlet hole 123 is arranged at the upper part of the semi-circular slender tube 121, and the lower end is connected to the corresponding position of the fluid pipeline section 302 through a single cavity end connector 122. Each semi-circular slender tube 121 is connected in parallel with the fluid pipeline section 302.

[0097] The fluid pipeline pump 301 of the driving component 300 is a fan 320. The preferred solution is a pipeline fan.

[0098] The multiple heat absorption and release fluid pipes 201 of the heat storage component unit 200 used in the second type of multi-span greenhouse distributed heat storage unit 1 are slender pipe networks 202, which are a type of air pipe network 220, arranged in the ground 600 of the heat island unit 504 preset inside the multi-span greenhouse 500. This ground 600 is the heat storage medium 401. If the multi-span greenhouse 500 is a multi-span greenhouse for aquaculture, the air pipe network 220 can also be arranged in the aquaculture water body of the fish pond. In this case, the heat storage medium 401 is the aquaculture water body. If the multi-span greenhouse 500 is a multi-span greenhouse for raising cattle and sheep, the air pipe network 220 can also be arranged in the floor / lying bed of the cattle and sheep shed.

[0099] The slender pipe network 202 that makes up the air pipe network 220 includes multiple parallel slender pipes 203 and a shunt main pipe 204 and a confluence main pipe 205 that are connected in parallel at both ends of each slender pipe 203. The fluid pipe segments 302 connected to the lower ends of each semi-circular slender pipe 121 are respectively connected to the corresponding side shunt main pipe 204. One end of the confluence main pipe 205 of the air pipe network 220 exposes from the ground 600 and is provided with an air outlet 221. A one-way open heat flow system 702 is formed from the first air inlet 123 to the air outlet 221.

[0100] In this one-way open heat flow system 702, the fan 320 is only located in one side fluid pipe segment 302. In Figures 4 - 6 each column, the fans 320 of the heat island unit 504 are all arranged near the middle column 503 away from the outer facade 505 of the multi-span greenhouse 500. The purpose is to make the air flow heat medium 420 of the ground heat island construction operation process direction 402 avoid flowing through the relatively low-temperature outer facade 505 to avoid large heat loss during the construction of the ground heat island.

[0101] In specific practice, the interval distance of the slender pipes 203 of the slender pipe network 202 is much smaller than the interval distance of the semi-circular slender pipes 121 (as Figure 10 shown), in order to improve the heat exchange efficiency between the poor heat conductor soil and the slender pipes 203.

[0102] The water flow multi-tube cavity complex 110 of the heat absorption component unit 100 of the first type of multi-span greenhouse distributed heat storage unit 1 is a curve (as Figure 9 shown), and the air flow single-tube cavity 120 of the heat absorption component unit 100 of the second type of multi-span greenhouse distributed heat storage unit 1 is another curve (as Figure 10 shown). The preferred solution is that these two curves coincide with the curve of the arch 501 of the multi-span greenhouse 500 so as to be connected to the arch 501 and arranged in the upper part of the heat island unit 504 space.

[0103] The fluid pipeline segments 302 connected to the two lower ends of each water flow multi-lumen complex 110 and the fluid pipeline segments 302 connected to one lower end of each air flow single lumen 120 are all in line with the truss 502 below the arch frame 501 so as to be arranged with the help of the truss 502. The vertically arranged fluid pipeline segments 302 are in line with the middle column 503 of the multi-span greenhouse 500 so as to be arranged with the help of the middle column 503. The advantage of this is that the water flow multi-lumen complex 110, the air flow single lumen 120 and the fluid pipeline segment 302 itself do not need the mechanical strength required to support them at the preset positions in the space of the heat island unit 504. Thus, the cost can be reduced.

[0104] Such as Figure 7 , Figure 8As shown, in some embodiments, the multi-span greenhouse distributed heat storage unit 1 is the third type of multi-span greenhouse distributed heat storage unit 1. The heat-absorbing fluid lumen 101 includes a water-air lumen complex 140 composed of a water flow multi-lumen formed by an elongated tube bundle 130 and an air flow single lumen 120 surrounded by it. The respective tube walls 134 of the water flow multi-lumen are connected by tube wings 135. Multiple tube wings 135 connect the water flow multi-lumen into a closed loop. The air flow single lumen 120 is surrounded by the tube wings 135 and the respective tube walls 134 of the water flow multi-lumen. A notch is provided on the tube wing 135 located in the middle of the air flow single lumen 120, serving as the second air inlet 141 of the air flow single lumen 120; the elongated pipe network 202 includes a water pipe network 210 and an air pipe network 220. An air outlet 221 is provided on the confluence main pipe 205 of the air pipe network 220; the water pipe network 210 and the air pipe network 220 are arranged in layers in the heat storage medium 401 of the preset heat island unit 504 inside the multi-span greenhouse 500; the fluid pipeline pump 301 includes a water pump 310 and a fan 320; the water-air lumen complex 140 includes: two water-air lumen complex end connectors 142. The water-air lumen complex end connector 142 includes a water flow diversion end 143, a water flow confluence end 144, and an air flow end 145. The water flow diversion ends 143 and the air flow ends 145 of the two water-air lumen complex end connectors 142 are respectively connected to the two ends of the water-air lumen complex 140; the water pump 310 and the fan 320 are respectively arranged on the side of the diversion main pipes 204 of the water pipe network 210 and the air pipe network 220; the water flow confluence end 144 and the air flow end 145 of the water-air lumen complex end connector 142 are respectively connected to the water pump 310 and the fan 320 by two fluid pipeline segments 302, and then the water pump 310 and the fan 320 are respectively connected to the diversion main pipe 204 of the water pipe network 210 and the diversion main pipe 204 of the air pipe network 220 by two fluid pipeline segments 302, and then a fluid pipeline segment 302 is used to connect the confluence main pipe 205 of the water pipe network 210 to the water flow confluence end 144 of the water-air lumen complex end connector 142, respectively forming a one-way open heat flow system 702 for air circulation and a one-way closed heat flow system 701 for water circulation, that is, an integrated heat flow system of "one-way open + one-way closed".

[0105] It should be noted that the cross-section of the water-air lumen complex 140 is a row of pipes 133, that is, the tube wings 135 connect the tube walls 134 of the water flow multi-lumen into a closed loop. The outer circle is multiple water flow multi-lumens and tube wings 135, and the center is the air flow single lumen 120. Correspondingly, the water-air lumen complex end connector 142 is a tubular multi-lumen end connector 138 used in cooperation with the row of pipes 133.

[0106] The end connector 142 of the water-air flow lumen complex is directional. The water flow confluence end 144 includes a flow channel 139, and the water flow diversion end 143 includes multiple flow channels 139. One flow channel 139 of the water flow confluence end 144 communicates with the multiple flow channels 139 of the water flow diversion end 143. Each flow channel 139 of the water flow diversion end 143 is in matching butt-joint with each water flow lumen of the water-air flow lumen complex 140. The air flow end 145 communicates with the single air flow lumen 120 in the center of the water-air flow lumen complex 140.

[0107] On the arch 501 of the multi-span greenhouse 500, the water flow multi-lumen complex 110 of the first type of multi-span greenhouse distributed heat storage unit 1 and the semi-arc slender tube 121 of the single air flow lumen 120 of the second type of multi-span greenhouse distributed heat storage unit 1 can be simultaneously arranged. Corresponding fluid pipeline sections 302 are arranged on the truss 502, and corresponding water pumps 310 and fans 320 are arranged on the middle column 503 on the preset side. Two layers of heat storage component units 200 are arranged in the ground 600 of the heat island unit 504. The air pipe network 220 is arranged on the upper layer, and the water pipe network 210 is arranged on the lower layer. The construction process directions 402 of the two types of multi-span greenhouse distributed heat storage units 1 are the same.

[0108] As Figure 8 As shown, the heat absorption component unit 100 used in the third type of multi-span greenhouse distributed heat storage unit 1 includes a water-air flow lumen complex 140 and an end connector 142 of the water-air flow lumen complex. Among them, the water-air flow lumen complex 140 is surrounded by a closed loop by the water flow multi-lumen complex 110. The water flow multi-lumen complex 110 is located on the outer circle, and the single air flow lumen 120 is located in the center. At the middle part of the water-air flow lumen complex 140 in the length direction, a preset notch on the pipe wing 135 forms a second air inlet 141, and the two heat absorption fluid lumens 101 can work synchronously.

[0109] The water-air flow lumen complex 140 is arranged by means of the arch 501 of the multi-span greenhouse 500. Two sets of fluid pipeline sections 302 are arranged. The two sets of fluid pipeline sections 302 are respectively connected to the water flow confluence end 144 and the air flow end 145 of the corresponding water-air flow lumen complex 140 through the end connector 142 of the water-air flow lumen complex at the corresponding positions.

[0110] Two layers of heat storage component units 200 are arranged in the ground 600 of the heat island unit 504. The air pipe network 220 is arranged on the upper layer, and the water pipe network 210 is arranged on the lower layer. The two sets of fluid pipeline sections 302 are also respectively connected to the confluence main pipes 205 and the diversion grab pipes 204 of the two types of networks. The construction process directions 402 of the two heat absorption fluid lumens 101 and the two slender pipe networks 202 are the same.

[0111] As Figures 11 - 14As shown, the water and gas flow tube cavity complex 140 is an elongated tube bundle 130 composed of row tubes 133 for simultaneously flowing through a water heat medium 410 and a gas heat medium 420. Correspondingly, the water and gas flow tube cavity complex end connector 142 is a tubular multi-tube cavity end connector 138 for simultaneously flowing through the water heat medium 410 and the gas heat medium 420. The gas single tube cavity 120 is located at the center of the cross-sectional shape, and the water multi-tube cavities surround it and are connected together by tube wings 135.

[0112] The use of end connectors with different cross-sectional shapes in cooperation with the ends of the elongated tube bundle 130 with various cross-sectional shapes means that the flow channels 139 of the two components are matched and docked so that the fluid heat medium 400 flowing through the flow channel 139 is unobstructed, and the fluid heat medium 400 does not leak under a set pressure.

[0113] The cross-section of the row tube 133 can be rectangular or circular, and the shape is not limited.

[0114] The embodiment of the present application also provides a method for constructing a large-scale ground heat island in a multi-span greenhouse 500. The large-scale ground heat island in the multi-span greenhouse 500 includes the multi-span greenhouse 500, and the heat storage medium 401 is the ground 600 in the multi-span greenhouse 500. The first type of distributed heat storage unit 1 for the multi-span greenhouse is enabled, and the interior of the multi-span greenhouse 500 is divided into multiple heat island units 504. One of the first type of distributed heat storage units 1 for the multi-span greenhouse is arranged in each heat island unit 504. Each water flow multi-tube cavity complex 110 of the first type of distributed heat storage unit 1 for the multi-span greenhouse is arranged in the space of the heat island unit 504 by being connected to the corresponding arch 501 of the heat island unit 504. The fluid pipeline section 302 is connected to each multi-tube cavity end connector 111 by means of the truss 502 of the heat island unit 504. The water pipe network 210 is arranged in the ground 600 of the heat island unit 504. The method for constructing the large-scale ground heat island in the multi-span greenhouse 500 includes: when the water temperature in the water flow multi-tube cavity complex 110 is higher than the water temperature in the water pipe network 210, the water pump 310 is turned on to start the one-way closed heat flow system 701 of the water circulation, and the high-temperature water in the water flow multi-tube cavity complex 110 exchanges with the low-temperature water in the water pipe network 210, so as to transfer the heat energy in the high-temperature water to the ground 600 of the heat island unit 504; when the water temperature in the water flow multi-tube cavity complex 110 is equal to or lower than the water temperature in the water pipe network 210, the water pump 310 is turned off to stop the one-way closed heat flow system 701 of the water circulation, and the water in the water flow multi-tube cavity complex 110 and the water in the water pipe network 210 are static; over time, the heat energy in the ground 600 near the water pipe network 210 of the heat island unit 504 transfers to the ground 600 in the direction away from the water pipe network 210 until the heat storage in the ground 600 within the preset range of the heat island unit 504 rises to the set value; over time, after the ground 600 of each heat island unit 504 in the multi-span greenhouse 500 continuously stores heat and rises to the preset value, a large-scale ground heat island in the multi-span greenhouse 500 is formed.

[0115] The embodiment of the present application also provides a method for constructing a large ground heat island in a multi-span greenhouse 500. The large ground heat island in the multi-span greenhouse 500 includes the multi-span greenhouse 500. The heat storage medium 401 is the ground 600 in the multi-span greenhouse 500. The second type of distributed heat storage unit 1 for the multi-span greenhouse is enabled. The interior of the multi-span greenhouse 500 is divided into multiple heat island units 504. A second type of distributed heat storage unit 1 for the multi-span greenhouse is arranged in each heat island unit 504. Each semi-circular slender pipe 121 of the second type of distributed heat storage unit 1 for the multi-span greenhouse is arranged in the space of the heat island unit 504 by connecting to the corresponding half arch frame 501 of the heat island unit 504. The fluid pipeline section 302 is connected to each single pipe cavity end connector 122 by means of the truss 502 of the heat island unit 504. The air pipe network 220 is arranged in the ground 600 of the heat island unit 504. The method for constructing the large ground heat island in the multi-span greenhouse 500 includes: when the temperature of the first air inlet 123 is higher than the ground temperature near the air pipe network 220, the fan 320 is turned on to start the one-way open heat flow system 702 for air circulation. The high-temperature air near the first air inlet 123 exchanges heat with the low-temperature air in the air pipe network 220, so as to transfer the heat energy in the high-temperature air to the ground 600 of the heat island unit 504; when the temperature of the first air inlet 123 is equal to or lower than the ground temperature near the air pipe network 220, the fan 320 is turned off to stop the one-way open heat flow system 702 for air circulation, and the air near the first air inlet 123 and the air in the air pipe network 220 are static; over time, the heat energy in the ground 600 near the air pipe network 220 of the heat island unit 504 is transferred to the ground 600 in the direction away from the air pipe network 220 until the heat storage in the ground 600 within the preset range of the heat island unit 504 rises to the set value; over time, after the ground 600 of each heat island unit 504 in the multi-span greenhouse 500 continuously stores heat and rises to the preset value, a large ground heat island in the multi-span greenhouse 500 is formed.

[0116] The embodiment of the present application also provides a method for constructing a large ground heat island in a multi-span greenhouse 500. The large ground heat island in the multi-span greenhouse 500 includes the multi-span greenhouse 500, and the heat storage medium 401 is the ground 600 in the multi-span greenhouse 500. The third type of distributed heat storage unit 1 for the multi-span greenhouse is enabled, and the interior of the multi-span greenhouse 500 is divided into multiple heat island units 504. A third type of distributed heat storage unit 1 for the multi-span greenhouse is arranged in each heat island unit 504. Each water-air flow tube cavity complex 140 of the third type of distributed heat storage unit 1 for the multi-span greenhouse is arranged in the space of this heat island unit 504 by connecting to the corresponding arch 501 of the heat island unit 504 where it is located. The fluid pipeline section 302 is connected to each end connector 142 of the water-air flow tube cavity complex by means of the truss 502 of the heat island unit 504 where it is located. The water pipe network 210 and the air pipe network 220 are arranged in the ground 600 of this heat island unit 504. The method for constructing the large ground heat island in the multi-span greenhouse 500 includes: when the temperature of the second air inlet 141 is higher than the ground temperature near the air pipe network 220, the fan 320 is turned on, and the one-way open heat flow system 702 for air circulation is started. The high-temperature air near the second air inlet 141 exchanges heat with the low-temperature air in the air pipe network 220, so as to transfer the heat energy in the high-temperature air to the ground 600 of this heat island unit 504; when the temperature of the second air inlet 141 is equal to or lower than the ground temperature near the air pipe network 220, the fan 320 is turned off, and the one-way open heat flow system 702 for air circulation stops, and the air near the second air inlet 141 and the air in the air pipe network 220 are static; when the water temperature in the water flow multi-tube cavity complex 110 is higher than the water temperature in the water pipe network 210, the water pump 310 is turned on, and the one-way closed heat flow system 701 for water circulation is started. The high-temperature water in the water flow multi-tube cavity complex 110 exchanges heat with the low-temperature water in the water pipe network 210, so as to transfer the heat energy in the high-temperature water to the ground 600 of this heat island unit 504; when the water temperature in the water flow multi-tube cavity complex 110 is equal to or lower than the water temperature in the water pipe network 210, the water pump 310 is turned off, and the one-way closed heat flow system 701 for water circulation stops, and the water in the water flow multi-tube cavity complex 110 and the water in the water pipe network 210 are static; over time, the heat energy in the ground 600 near the air pipe network 220 and the water pipe network 210 of this heat island unit 504 is transferred to the ground 600 in the direction away from the air pipe network 220 and the water pipe network 210 until the heat storage in the ground 600 within the preset range of this heat island unit 504 is heated up to the set value; over time, after the ground 600 of each heat island unit 504 in the multi-span greenhouse 500 continues to store heat and rise to the preset value, a large ground heat island in the multi-span greenhouse 500 is formed.

[0117] The embodiment of the present application also provides a method for constructing a large ground heat island in a multi-span greenhouse 500. The large ground heat island in the multi-span greenhouse 500 includes the multi-span greenhouse 500, and the heat storage medium 401 is the ground 600 inside the multi-span greenhouse 500. The first type of distributed heat storage unit 1 for the multi-span greenhouse and the second type of distributed heat storage unit 1 for the multi-span greenhouse are enabled, and the interior of the multi-span greenhouse 500 is divided into multiple heat island units 504. One of the first type of distributed heat storage unit 1 for the multi-span greenhouse and the second type of distributed heat storage unit 1 for the multi-span greenhouse are arranged in each heat island unit 504. The water flow multi-tube cavity complex 110 of the first type of distributed heat storage unit 1 for the multi-span greenhouse is arranged in the space of this heat island unit 504 by connecting to the corresponding arch 501 of the heat island unit 504 where it is located. Each semi-circular slender tube 121 of the second type of distributed heat storage unit 1 for the multi-span greenhouse is arranged in the space of this heat island unit 504 by connecting to the corresponding half arch 501 of the heat island unit 504 where it is located. The fluid pipeline section 302 is connected to each multi-tube cavity end connector 111 and each single-tube cavity end connector 122 by means of the truss 502 of the heat island unit 504 where it is located. The water pipe network 210 and the air pipe network 220 are arranged in the ground 600 of this heat island unit 504. The method for constructing the large ground heat island in the multi-span greenhouse 500 includes: when the temperature of the first air inlet 123 is higher than the ground temperature near the air pipe network 220, the fan 320 is turned on, so that the unidirectional open heat flow system 702 for air circulation is started, and the high-temperature air near the first air inlet 123 exchanges heat with the low-temperature air in the air pipe network 220, so as to transfer the heat energy in the high-temperature air to the ground 600 of this heat island unit 504; when the temperature of the first air inlet 123 is equal to or lower than the ground temperature near the air pipe network 220, the fan 320 is turned off, so that the unidirectional open heat flow system 702 for air circulation stops, and the air near the first air inlet 123 and the air in the air pipe network 220 are static; when the water temperature in the water flow multi-tube cavity complex 110 is higher than the water temperature in the water pipe network 210, the water pump 310 is turned on, so that the unidirectional closed heat flow system 701 for water circulation is started, and the high-temperature water in the water flow multi-tube cavity complex 110 exchanges heat with the low-temperature water in the water pipe network 210, so as to transfer the heat energy in the high-temperature water to the ground 600 of this heat island unit 504; when the water temperature in the water flow multi-tube cavity complex 110 is equal to or lower than the water temperature in the water pipe network 210, the water pump 310 is turned off, so that the unidirectional closed heat flow system 701 for water circulation stops, and the water in the water flow multi-tube cavity complex 110 and the water in the water pipe network 210 are static; over time, the heat energy in the ground 600 near the air pipe network 220 and the water pipe network 210 of this heat island unit 504 is transferred to the ground 600 in the direction away from the air pipe network 220 and the water pipe network 210 until the heat storage in the preset range of the ground 600 of this heat island unit 504 is heated up to the set value; over time, after the ground 600 of each heat island unit 504 in the multi-span greenhouse 500 continues to store heat and rise in temperature to the preset value, a large ground heat island in the multi-span greenhouse 500 is formed.

[0118] It should be noted that the multi-span greenhouse 500 mainly used for plant cultivation forms a ground heat island of the multi-span greenhouse 500 by using the soil of the ground 600 of the multi-span greenhouse 500 as the heat storage medium 401. The ground heat island has two functions: one is to raise the soil temperature of each part inside the multi-span greenhouse 500 to the set value and make it uniform, which is beneficial to the root development of plants planted in the multi-span greenhouse 500 in winter; the other is to extract the heat energy in the ground heat island to supplement the heat energy lost in the above-ground space of the heat island unit 504 at night or on overcast days in winter, so as to keep the air temperature of each part inside the multi-span greenhouse 500 at the set value and make it uniform, preventing the temperature of the above-ground space of the multi-span greenhouse 500 from being too low and affecting the development of plant stems, leaves, flowers and fruits.

[0119] When the multi-span greenhouse 500 has a preset heat preservation function, the ground heat island of the multi-span greenhouse 500 stores heat energy by using the soil in the ground 600 covered by the multi-span greenhouse 500 as the heat storage medium 401. This process of storing heat energy is continuous over the years and accumulates day by day until the soil temperature at the preset depth of the ground 600 reaches the preset value, forming the expected ground heat island of the multi-span greenhouse 500.

[0120] The ground 600 covered by the multi-span greenhouse 500 is connected to the external ground 600. The heat energy stored in the ground heat island of the multi-span greenhouse 500 will transfer to the external ground 600 through the boundary of the ground heat island. The larger the multi-span greenhouse 500 is, the larger the area of the ground 600 it covers. Correspondingly, the larger the ground heat island of the multi-span greenhouse 500 is, the smaller the boundary ratio of the ground heat island to the external ground 600 is, and the smaller the proportion of heat energy transferred out through the junction is, and the higher the heat storage efficiency of the ground heat island is.

[0121] Compared with the existing heat storage methods of plant cultivation greenhouses, the purpose of making the ground 600 covered by the multi-span greenhouse 500 for plant cultivation become an independent ground heat island is to transfer the heat energy stored in the ground heat island out of the ground 600 when there is no solar energy supply in the multi-span greenhouse 500 on overcast days in winter, so as to slow down the continuous decrease of the temperature in the multi-span greenhouse 500 and avoid cold damage to the plants planted in the multi-span greenhouse 500.

[0122] The distributed heat storage unit 1 of the multi-span greenhouse provided by the present invention uses a fluid as the medium. Since the flow path of the fluid heat medium 400 in the fluid lumen is short, the air heat energy in each heat island unit 504 is transferred to the ground 600 of this heat island unit 504 nearby. The advantage of this is that the actual amount of heat energy obtained in the ground 600 of each heat island unit 504 is close, and the temperature of the ground 600 of each heat island unit 504 is similar.

[0123] Inside the multi-span greenhouse 500, multiple heat island units 504 are demarcated. In each heat island unit 504, the distributed heat storage unit 1 for multi-span greenhouses provided by the present invention is arranged. Each distributed heat storage unit 1 for multi-span greenhouses provided by the present invention heats the ground 600 of its respective heat island unit 504. The grounds 600 of each heat island unit 504 are connected together to form the ground heat island of the multi-span greenhouse 500.

[0124] If a fluid is used as the medium and the air heat energy of the multi-span greenhouse 500 is transferred to the ground 600 as a whole by a central heat storage unit, due to the long flow path of the fluid heat medium 400 in the fluid lumen, there must be a temperature difference between the upstream and downstream of the fluid. That is, in terms of heat absorption, the temperature difference in the upstream is large and the heat absorption efficiency is high, while the temperature difference in the downstream is small, the heat absorption efficiency is low or even the heat absorption stagnates; in terms of ground 600 heat storage, the temperature difference in the upstream is large and the ground 600 heat storage efficiency is high, while the temperature difference in the downstream is small, the ground 600 heat storage efficiency is low or even the heat storage stagnates; in terms of heat release, the temperature difference in the upstream is large and the ground 600 heat release efficiency is high, while the temperature difference in the downstream is small, the ground 600 heat release efficiency is low or even the heat release stagnates. As a result, the utilization rate of the air heat energy of the multi-span greenhouse 500 is low, the actual amount of heat energy obtained by each part of the soil of the ground 600 is uneven, resulting in inconsistent soil temperatures, thus leading to inconsistent growth and development of the roots of the plants planted in each part; the ground 600 heat release efficiency is low, and the amount of heat released from the ground 600 obtained by each part of the space in the multi-span greenhouse 500 is inconsistent during continuous cloudy days, resulting in inconsistent air temperatures in each part, thus leading to inconsistent growth and development of the stems, leaves, flowers and fruits of the plants planted in each part; even, the plants planted in the parts with less heat gain in the multi-span greenhouse 500 may suffer from cold damage.

[0125] The embodiment of the present application also provides a method for using the ground heat island of the multi-span greenhouse 500. On the basis of the above-mentioned method for constructing the ground heat island of the multi-span greenhouse 500, an air valve 304 is provided in the fluid pipeline section 302 in front of the fan 320, and a third air inlet hole 303 is provided between the air valve 304 and the fan 320. The method for using the ground heat island of the multi-span greenhouse 500 includes:

[0126] When the preset air temperature near the third air inlet hole 303 is lower than the ground heat island ground temperature near the air pipe network 220, the fan 320 is turned on, so that the one-way open heat flow system 702 of air circulation is started. The cold air enters the air pipe network 220 from the third air inlet hole 303 through the shunt main pipe 204 of the air pipe network 220. The cold air is heated by the heat energy in the heat island unit 504 of the ground heat island where it is located in the air pipe network 220 and then discharged from the air outlet hole 221 of the confluence main pipe 205 of the air pipe network 220, so as to heat the space air temperature of the heat island unit 504 where it is located.

[0127] When the preset air temperature near the third air inlet hole 303 is higher than or equal to the ground heat island ground temperature near the air pipe network 220, the fan 320 is turned off, the one-way open heat flow system 702 for air circulation stops, and the air near the third air inlet hole 303 and the air near the air outlet hole 221 of the confluence main pipe 205 of the air pipe network 220 are stationary;

[0128] The heat energy in the heat island unit 504 of the ground heat island that is far from the air pipe network 220 transfers to the vicinity of the air pipe network 220 to heat the air in the air pipe network 220.

[0129] It should be noted that the air in the internal space of the multi-span greenhouse 500 will continuously experience heat loss on winter nights or during continuous cloudy days in winter, resulting in a continuous decrease in air temperature. When the air temperature is lower than the set value, it will cause cold damage, freezing damage, or even death to the planted plants. The heat energy stored in the ground heat island of the multi-span greenhouse 500 is mainly used to supplement the heat energy of the air above the ground in the multi-span greenhouse 500 where plants are planted to make up for the heat loss when the above situation occurs, so as to achieve the balance of heat energy gain and loss of the air in the multi-span greenhouse 500, and thus maintain the air temperature within the set range.

[0130] The ground heat island of the multi-span greenhouse 500 is in a heat gain state during sunny days and in a heat loss state during winter nights or continuous cloudy days in winter.

[0131] During winter nights or continuous cloudy days in winter, if the heat preservation efficiencies of different parts of the enclosure structure that make up the internal space of the multi-span greenhouse 500 are different, the heat loss of the corresponding heat island unit 504 will be large, the air temperature of this heat island unit 504 will drop rapidly, and it is necessary to turn on the fan 320 in advance to extract heat energy from the ground 600 of this heat island unit 504 to the above-ground space to make up for the heat loss and prevent the temperature from dropping.

[0132] Intelligent temperature control devices can be set in each heat island unit 504 of the multi-span greenhouse 500. When the air in a certain heat island unit 504 needs to supplement heat energy, the distributed heat storage unit 1 of the multi-span greenhouse is automatically started, and when the temperature of the heat island unit 504 reaches the preset state, the unit is automatically turned off.

[0133] In the heat island unit 504 with more heat loss, more heat energy supply is needed to balance the heat energy gain and loss of this heat island unit 504. The heat storage function of the distributed heat storage unit 1 of the multi-span greenhouse arranged in this heat island unit 504 can be strengthened to increase the heat storage quantity of this heat island unit 504 to cope with more heat loss phenomena. The heat storage of the ground 600 can be increased by extending the heat storage duration of the distributed heat storage unit 1 of the multi-span greenhouse in this heat island unit 504, or the heat storage of the ground 600 can also be increased by densifying the spacing distance of the slender pipes 203 of the slender pipe network 202 in the ground 600 of this heat island unit 504.

[0134] The above are only the preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. An elongated pipe network, characterized in that, It is used for heat absorption and storage operations within the preset heat island unit range inside the multi-span greenhouse. The slender pipe network includes a plurality of slender pipes arranged at intervals, a shunt main pipe and a confluence main pipe connected in parallel to both ends of the slender pipes. The slender pipe network also includes a fluid pipeline pump and a fluid pipeline section. The fluid pipeline pump is a fan, and the slender pipe network is an air pipe network. Water-permeable holes are provided on the walls of the slender pipes that make up the air pipe network, so that the condensed water formed by the humid and hot air in the multi-span greenhouse in the slender pipes can pass through the water-permeable holes and penetrate the wall of the slender pipe, thereby eliminating the risk of blocking the slender pipes. The air pipe network is arranged in the soil of the preset heat island unit. The shunt main pipe of the air pipe network is connected to the fan through the fluid pipeline section, and the confluence main pipe of the air pipe network is communicated with the multi-span greenhouse space through the fluid pipeline section; The fan is arranged on the side of the shunt main pipe. The fluid heat medium air in the slender pipe network in the soil of the heat island unit is under positive pressure from the fan, and the fluid heat medium air in the above-ground space of the heat island unit is sucked into the air pipe network by the negative pressure of the fan, so as to form a one-way open air heat flow system.

2. A multi-span greenhouse distributed heat storage unit, characterized in that, Enable a kind of slender pipe network according to claim 1, which includes a plurality of heat absorption fluid pipe cavities for passing through a fluid heat medium. The plurality of heat absorption fluid pipe cavities are arranged at intervals in the space of the preset heat island unit inside the multi-span greenhouse; the heat absorption fluid pipe cavity is an air flow single pipe cavity composed of slender pipes, the air flow single pipe cavity is a semi-circular arc slender pipe, and a first air inlet hole of the air flow single pipe cavity is arranged on the upper part of the semi-circular arc slender pipe; the heat absorption fluid pipe cavity includes: A single pipe cavity end connector, which is connected to the lower bottom end of the semi-circular arc slender pipe. The single pipe cavity end connector is connected to the fan through the fluid pipeline section, and the fan is connected to the shunt main pipe of the air pipe network through the fluid pipeline section, so as to form a one-way open heat flow system for air circulation.

3. A method for constructing a large-scale greenhouse ground heat island, characterized in that, The multi-span greenhouse ground heat island includes a multi-span greenhouse. Enable a kind of multi-span greenhouse distributed heat storage unit according to claim 2. Divide the inside of the multi-span greenhouse into a plurality of heat island units, and arrange one of the second multi-span greenhouse distributed heat storage units in each heat island unit. Each semi-circular arc slender pipe of the second multi-span greenhouse distributed heat storage unit is arranged in the space of this heat island unit by connecting to the corresponding half arch frame of the heat island unit where it is located. The fluid pipeline section is connected to each single pipe cavity end connector through the truss of the heat island unit where it is located. The air pipe network is arranged in the soil of this heat island unit. The method for constructing the multi-span greenhouse ground heat island includes: When the temperature of the first air inlet hole is higher than the ground temperature near the air pipe network, start the fan to start the one-way open heat flow system for air circulation, and exchange the high-temperature air near the first air inlet hole with the low-temperature air in the air pipe network, so as to transfer the heat energy in the high-temperature air to the soil of this heat island unit; When the temperature of the first air inlet hole is equal to or lower than the ground temperature near the air pipe network, the fan is turned off, the one-way open heat flow system of air circulation stops, and the air near the first air inlet hole and the air in the air pipe network are stationary; Over time, the heat energy in the ground near the air pipe network of this heat island unit transfers to the ground away from the air pipe network until the heat storage in the ground within the preset range of this heat island unit rises to the set value; Over time, after the ground of each heat island unit in the multi-span greenhouse continuously stores heat and rises to the preset value, a multi-span greenhouse ground heat island is formed.

4. A method for using the ground heat island of a multi-span greenhouse, characterized in that, Based on the method for constructing a multi-span greenhouse ground heat island described in claim 3, an air valve is provided in the fluid pipeline section in front of the fan, and a third air inlet hole is provided between the air valve and the fan. The method for using the multi-span greenhouse ground heat island includes: When the preset temperature near the third air inlet hole is lower than the ground heat island temperature of the ground near the air pipe network, the fan is turned on, the one-way open heat flow system of air circulation is started, cold air enters the air pipe network from the third air inlet hole through the shunt main pipe of the air pipe network, and this cold air is heated by the heat energy in the heat island unit of the ground heat island where it is located in the air pipe network and then discharged from the air outlet hole of the confluence main pipe of the air pipe network for heating the space temperature of the heat island unit where it is located; When the preset temperature near the third air inlet hole is higher than or equal to the ground heat island temperature of the ground near the air pipe network, the fan is turned off, the one-way open heat flow system of air circulation stops, and the air near the third air inlet hole and the air near the air outlet hole of the confluence main pipe of the air pipe network are stationary; The heat energy away from the air pipe network in the heat island unit of the ground heat island where it is located transfers to the vicinity of the air pipe network for heating the air in the air pipe network.

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