Sunlight greenhouse water circulation underground gravel heat storage and insulation system
By installing serpentine structured heat storage water pipes and heat storage boxes underground in the greenhouse, combined with extruded insulation boards, the problem of insufficient heat storage in traditional greenhouses is solved, efficient underground heat storage and continuous heating of crop roots is achieved, and greenhouse environment regulation is adapted to the cold areas of high latitudes.
Patent Information
- Application Number
- CN202422716800.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-08
- Publication Date
- 2025-09-02
- Estimated Expiration
- 2034-11-08
AI Technical Summary
Traditional brick wall greenhouses have difficulty maintaining the required temperature of crops by heat storage in high latitude areas. The groundwater tank structure is limited and it is impossible to continuously heat up the soil at the roots of crops. The existing water circulation device has limited effect in heating shallow soil during the day.
The underground sand and gravel heat storage system is adopted, and the heat energy storage and heat storage water pipes and heat storage boxes with a serpentine structure are used. Combined with the extruded insulation board, the heat storage medium is stored underground during the day and heat is circulated at night. The operation of the water pump is adjusted through the automatic control system to achieve efficient storage and uniform heat transfer.
It improves solar and thermal energy utilization, improves the temperature of the greenhouse at night, enhances the low temperature resistance of the greenhouse, ensures the soil temperature at the roots of crops, adapts to colder areas at higher latitudes, and improves heat storage efficiency and thermal insulation performance.
Smart Images
Figure CN223286285U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of agricultural greenhouse environment control, in particular to a solar greenhouse water circulation underground sand and stone heat storage and insulation system. Background Art
[0002] In recent years, my country's agricultural infrastructure has rapidly developed, and greenhouses have become increasingly popular as a key method for producing horticultural crops in northern my country. Traditional brick-wall greenhouses rely on sunlight as their energy source, with the brick walls storing heat and maintaining the required temperature for greenhouse crops in winter. However, due to their structural and material properties, brick walls are limited in the amount of heat they can receive and store during the day. In higher latitudes, relying solely on the heat stored in brick walls is insufficient to maintain the required temperature for crops. Water has excellent heat storage and release properties, and water-based heat storage is increasingly being used in greenhouse construction. Most water-based heat storage systems are installed on the north wall to fully absorb solar energy. However, above-ground heat storage tanks occupy too much space, and the size of underground water tanks is limited, making them inadequate for sufficient heat storage. The soil temperature at the root level of greenhouse crops is also crucial. Excessively low temperatures hinder nutrient transport and slow crop growth. Existing greenhouse underground circulation pipes only heat the shallow soil layer during the day and cannot continuously heat the soil at the root level at night. Therefore, there is an urgent need for a heat storage and release device that can absorb solar energy during the day, convert it into heat, store it, and then circulate it indoors for release at night. The key design is to utilize the underground space of the greenhouse to accumulate more heat, improve heat storage efficiency, and at the same time effectively and continuously heat the soil area around the crop roots, maintaining the temperature environment required for crop root growth. Summary of the Invention
[0003] In order to make up for the shortcomings of the above-mentioned existing technologies, the purpose of this utility model is to provide a solar greenhouse water circulation underground sand and gravel heat storage and insulation system. This device has high heat storage efficiency, good insulation performance, can effectively improve the environmental temperature required for crop growth, and is suitable for greenhouse heat storage and insulation technology.
[0004] In order to achieve the above-mentioned purpose, the present invention provides the following technical solutions:
[0005] A solar greenhouse water circulation underground sand and gravel heat storage and insulation system, comprising a north greenhouse wall 1 on the north side of the greenhouse and a south roof membrane on the south side of the greenhouse, with a rollable insulation blanket provided on the south roof membrane. The solar greenhouse is arranged in an east-west direction, with a span of the greenhouse in a north-south direction. Greenhouse crops 4 are planted in an east-west ridge pattern in the soil 8 within the greenhouse.
[0006] The solar greenhouse water circulation underground sand and stone heat storage and insulation system includes a plurality of identical component units and circulation pipelines;
[0007] The single component unit includes a light energy conversion-hot water storage and release pipe 2 and a heat storage tank 3 installed on the inner surface of the north wall 1 of the greenhouse;
[0008] The heat storage tanks 3 are buried side by side in the soil 8; the individual heat storage tanks 3 are arranged in parallel along the span direction of the greenhouse, i.e., the north-south direction; the root ends of the greenhouse crops 4 are at a certain distance from the upper surface of the heat storage tanks 3;
[0009] The heat storage box 3 includes an extruded insulation board 5, a heat energy storage-hot water storage and discharge pipe 6 and a heat storage medium 7;
[0010] A heat storage-hot water storage and discharge pipe 6 is installed inside the heat storage tank 3; the water inlet of the heat storage-hot water storage and discharge pipe 6 is connected to the water outlet of the light energy conversion-hot water storage and discharge pipe 2 through the water outlet pipe 12; the water outlet of the heat storage-hot water storage and discharge pipe 6 is connected to the water inlet of the light energy conversion-hot water storage and discharge pipe 2 through the water inlet pipe 9; the heat storage-hot water storage and discharge pipe 6 inside the heat storage tank 3 is arranged in multiple layers in a serpentine structure;
[0011] The heat storage box 3 is filled with pebbles and sand as heat storage medium 7;
[0012] The heat storage box 3 is surrounded by extruded insulation boards 5 for heat preservation;
[0013] Evenly arranged heat dissipation holes 16 are provided on the extruded heat insulation board 5 on the upper surface of the heat storage box 3;
[0014] A light energy conversion-hot water storage and release pipe 2 is installed on the inner surface of the north wall 1 of the greenhouse;
[0015] The water inlet pipe 9 is provided with a circulating water pump 11 ; an automatic control system 13 is electrically connected to the circulating water pump 11 ; the automatic control system 13 regulates the operating state of the circulating water pump 11 ; the water outlet pipe 12 is provided with a flow meter 14 and a temperature monitoring device 15 .
[0016] The linear interval between two adjacent heat storage tanks 3 is preferably 1.5 meters.
[0017] The root ends of the greenhouse crops 4 are 10 cm away from the upper surface of the heat storage box 3 .
[0018] The thermal energy storage-hot water storage and discharge pipe 6 has a four-layer structure from top to bottom, and each layer is designed as a serpentine loop.
[0019] A water pipe fixing bracket 10 is provided at the upper and lower parts of the solar energy conversion-hot water storage and release pipe 2; the water pipe fixing bracket 10 is fixedly installed on the north wall 1 of the greenhouse by expansion bolts; the water pipe fixing bracket 10 is designed in an arch shape, with a semicircular cast iron part in the middle that is larger than the radius of the water pipe, and bolt holes are provided at both ends for fixed installation.
[0020] The automatic control system 13 adopts the AOKE water pump automatic controller commonly used in the market to automatically control the operating status of the water pump.
[0021] The thermal energy storage-hot water storage and discharge pipe 6, the water inlet pipe 9 and the water outlet pipe 12 are made of TP2 copper with a purity of 99.9%.
[0022] Compared with the prior art, the beneficial effects of the present invention are:
[0023] 1. The utility model is a solar greenhouse water circulation underground sand and stone heat storage and insulation system applied to the traditional solar greenhouse. While ensuring the heat storage of the north wall throughout the day, the excess heat in the greenhouse is stored and transferred to the underground for preservation. At night, it is recycled and discharged to the greenhouse for heating, which greatly improves the utilization rate of solar energy and thermal energy, increases the average temperature of the greenhouse at night, and improves the low temperature resistance of the greenhouse, so that it can adapt to the climate of higher latitudes and colder areas.
[0024] 2. The utility model adopts a heat storage mode of filling the underground heat storage box with pebbles and gravels in a water circulation underground sand and gravel heat storage system for a solar greenhouse. The larger heat storage volume increases the total heat storage amount.
[0025] 3. This utility model utilizes a serpentine structure for the pipe structure of a solar greenhouse water circulation underground sandstone thermal insulation system, improving flow uniformity and efficiency during water circulation and reducing heat loss. The multi-layered serpentine tubular structure within the thermal storage tank significantly increases the contact area and distribution uniformity between the water pipes and the thermal storage medium, evenly transferring heat throughout the tank during water circulation.
[0026] 4. This utility model utilizes a solar greenhouse water-circulating underground sandstone thermal insulation system with a heat storage tank surrounded by strong, highly insulating extruded plastic panels to prevent heat loss. The porous top design allows the tank to continuously heat the soil around the crop roots through the porous channels while the heat is stored, ensuring the ideal soil temperature for root growth. BRIEF DESCRIPTION OF THE DRAWINGS
[0027] Figure 1 This is a schematic diagram of the three-dimensional structure of the greenhouse interior of the solar greenhouse water circulation underground sand and stone heat storage and insulation system of the utility model;
[0028] Figure 2 This is a schematic diagram of the east-west cross-sectional structure of the solar greenhouse water circulation underground sand and stone heat storage and insulation system of the utility model;
[0029] Figure 3 This is a schematic structural diagram of the solar greenhouse water circulation underground sand and stone heat storage and insulation system of the utility model;
[0030] Figure 4This is a three-dimensional structural diagram of the circulation pipeline of the underground sand and stone heat storage and insulation system for the solar greenhouse water circulation of the present utility model;
[0031] Figure 5 It is a top view of the circulation pipeline of the underground sand and stone heat storage and insulation system for water circulation in the solar greenhouse of the present utility model;
[0032] Figure 6 This is a schematic diagram of the installation of the light energy conversion-hot water storage and release pipe and the north wall of the greenhouse in this utility model.
[0033] The accompanying drawings are as follows:
[0034] 1. North wall of greenhouse 2. Solar energy conversion-hot water storage and release pipe
[0035] 3. Heat storage box 4. Greenhouse crops
[0036] 5. Extruded insulation board 6. Thermal energy storage - hot water storage and discharge pipes
[0037] 7. Heat storage medium 8. Soil
[0038] 9. Water inlet pipe 10. Water pipe fixing bracket
[0039] 11. Circulating water pump 12. Outlet pipe
[0040] 13. Automatic control system 14. Flow meter
[0041] 15. Temperature monitoring device 16. Heat dissipation holes DETAILED DESCRIPTION
[0042] The specific implementation of the present invention will be further described below with reference to the accompanying drawings.
[0043] A solar greenhouse water-circulating underground sand and gravel heat storage and insulation system comprises multiple identical component units and circulation piping. The solar greenhouse comprises a north wall 1 on the north side of the greenhouse and a south roof membrane on the south side of the greenhouse. A rollable insulation blanket is provided on the south roof membrane. The solar greenhouse is arranged in an east-west orientation, with a north-south span. Greenhouse crops 4 are planted in an east-west ridge pattern in the soil 8 within the greenhouse.
[0044] like Figures 1 to 6 As shown, the single component unit includes a light energy conversion-hot water storage and release pipe 2 and a heat storage box 3 installed on the inner surface of the north wall 1 of the greenhouse.
[0045] The heat storage tanks 3 are buried side by side in the soil 8. The individual heat storage tanks 3 are arranged parallel to each other along the greenhouse's span, i.e., the north-south direction. The linear spacing between two adjacent heat storage tanks 3 is preferably 1.5 meters. The greenhouse crops 4 are planted in an east-west ridge pattern with a spacing of 40 centimeters. The root tips of the greenhouse crops 4 are positioned a certain distance from the top surface of the heat storage tanks 3. Preferably, the root tips of the greenhouse crops 4 are positioned 10 centimeters from the top surface of the heat storage tanks 3.
[0046] The heat storage box 3 includes an extruded insulation board 5, a heat energy storage and hot water storage and release pipe 6 and a heat storage medium 7.
[0047] like Figure 4 and Figure 5 As shown, a heat storage and hot water pipe 6 is installed within the thermal storage tank 3. The water inlet of the heat storage and hot water pipe 6 is connected to the water outlet of the solar energy conversion and hot water pipe 2 via an outlet pipe 12; the water outlet of the heat storage and hot water pipe 6 is connected to the water inlet of the solar energy conversion and hot water pipe 2 via an inlet pipe 9. The heat storage and hot water pipe 6 within the thermal storage tank 3 is arranged in multiple layers in a serpentine structure, significantly improving the heat exchange efficiency between the pipe and the medium filled within the tank.
[0048] Preferably, the thermal energy storage and hot water pipe 6 has a four-layer structure from top to bottom, with each layer adopting a serpentine loop design. The water inlet of the bottom layer is located at one end, and a 180° elbow at the other end changes the water flow direction from horizontal to vertical, allowing water to flow from the bottom layer to the upper layer. Based on the same principle, the four layers of the thermal energy storage and hot water pipe 6 are arranged in a combination of straight pipes and curved pipes.
[0049] The heat storage box 3 is filled with pebbles and sand as heat storage medium 7. Pebbles and sand have good thermal conductivity and structural support, ensuring the structural safety of the heat storage box 3 underground.
[0050] The heat storage box 3 is surrounded by an extruded heat-insulating board 5 for heat preservation, and the inner surface of the extruded heat-insulating board 5 is wrapped with a sealing plastic film to prevent the water medium from evaporating and losing.
[0051] like Figure 3 As shown, evenly spaced heat dissipation holes 16 are provided on the extruded insulation board 5 on the upper surface of the heat storage box 3. The heat dissipation holes 16 connect the soil 8 with the heat storage medium 7 filled in the heat storage box 3. The plastic film wrapped around the inner surface of the extruded insulation board 5 prevents the water medium from evaporating and losing.
[0052] like Figure 1 and Figure 6As shown, a solar energy conversion-hot water storage and release pipe 2 is installed on the inner surface of the north wall 1 of the greenhouse. A water pipe fixing bracket 10 is provided at the upper and lower parts of the solar energy conversion-hot water storage and release pipe 2. The water pipe fixing bracket 10 is fixed to the north wall 1 of the greenhouse by expansion bolts. The water pipe fixing bracket 10 is designed in an arch shape, with a semicircular cast iron part in the middle that is larger than the radius of the water pipe, and bolt holes are provided at both ends for fixed installation. The water pipe fixing bracket 10 generates sufficient stress through the expansion bolts to bear the weight of the solar energy conversion-hot water storage and release pipe 2. The solar energy conversion-hot water storage and release pipe 2 is spliced by a straight pipe and a 180° elbow. The straight pipe and the elbow are re-melted and shaped by a hot melt gun. The pipe design adopts a serpentine structure, which facilitates the efficiency and uniformity of water circulation in the pipe and better transfers heat to the underground heat storage box 3.
[0053] The water inlet pipe 9 is provided with a circulating water pump 11. An automatic control system 13 is electrically connected to the circulating water pump 11. The automatic control system 13 regulates the operating state of the circulating water pump 11. The water outlet pipe 12 is provided with a flow meter 14 and a temperature monitoring device 15.
[0054] Preferably, the automatic control system 13 utilizes a commonly used AOKE automatic pump controller to automatically control the pump's operating status. The automatic control system 13 of the present invention only ensures that the circulating water pump 11 operates regularly within a specific time period: for example, for 5 minutes every 20 minutes over a two-hour period. The operating time and rest time of the circulating water pump 11 are calculated based on the pump's power, the real-time flow rate measured by the flowmeter 14, and the length of the water pipes within the solar energy conversion-hot water storage and discharge pipe 2 and the heat storage tank 3, thereby improving heat storage efficiency.
[0055] The thermal energy storage-hot water storage and discharge pipe 6, the water inlet pipe 9 and the water outlet pipe 12 are made of TP2 copper with a purity of 99.9%, which has good thermal conductivity, stable chemical properties, is not easy to corrode, and has high tensile strength.
[0056] The working process of this utility model is:
[0057] Daytime heat storage: As the sun rises and the blanket is rolled up, the intensity of solar radiation received by the greenhouse gradually increases, raising the indoor temperature. This heat accumulates on the inner surface of the greenhouse's north wall 1, causing the temperature near the north wall to exceed the air temperature. Under the influence of solar radiation and thermal radiation from the air and the north wall 1, the temperature of the light energy conversion and hot water storage pipe 2 gradually rises, transferring heat to the water, gradually increasing the water temperature.
[0058] Temperature monitoring device 15 monitors the water temperature within solar energy conversion-heating water storage and discharge pipe 2 in real time. When the indoor air temperature and the water temperature within solar energy conversion-heating water storage and discharge pipe 2 rise rapidly, automatic control system 13 issues a start command, activating circulating water pump 11. Circulating water pump 11 converts the rotational power of the turbine into power to circulate the water within solar energy conversion-heating water storage and discharge pipe 2. Because the low-temperature water flowing into solar energy conversion-heating water storage and discharge pipe 2 through water inlet pipe 9 requires a certain amount of time to receive radiation and heat, the heat storage cycle is performed in an intermittent mode, with circulating water pump 11 shutting down after a period of operation.
[0059] Hot water entering the thermal storage tank 3 through the outlet pipe 12 first exchanges heat with the bottom-level serpentine heat energy storage and hot water storage pipe 6, which then transfers heat to the thermal storage medium 7. The hot water entering the thermal storage tank 3 continuously heats the thermal storage medium 7, and this cycle continues to store heat indoors. When the temperature inside the thermal storage tank 3 reaches a certain level, the heat in the thermal storage medium 7 escapes through the heat dissipation holes 16 to the soil near the crop roots due to the temperature difference between the inside and outside of the tank, indirectly raising the average root soil temperature. When solar radiation reaches a low level and the water temperature in the solar energy conversion and hot water storage pipe 2 rises slowly, the circulating water pump 11 is stopped.
[0060] Nighttime Heat Release: At night, the outdoor temperature drops sharply. The large temperature difference between indoor and outdoor temperatures forces indoor heat to continuously escape, gradually lowering the indoor temperature. When the indoor air temperature drops to a set threshold, the automatic control system 13 issues a command to the circulating water pump 11 to start. Hot water from the thermal energy storage and hot water pipe 6 flows through the water inlet pipe 9 into the solar energy conversion and hot water pipe 2. When all of the hot water in the solar energy conversion and hot water pipe 2 is circulated, the circulating water pump 11 stops. At this time, the hot water in the solar energy conversion and hot water pipe 2 exchanges heat with the greenhouse air, transferring heat to the indoor air and raising the air temperature. Simultaneously, the heat storage medium 7 in the heat storage tank 3 and the thermal energy storage and hot water pipe 6 exchange heat due to the temperature difference. Heat from the heat storage medium 7 is continuously transferred to the water in the thermal energy storage and hot water pipe 6, raising the water temperature. When the air temperature drops to the threshold again, the intermittent circulation mode resumes. This cycle repeats, and the nighttime water circulation underground sand and gravel heat storage and insulation system continuously heats the indoor air, ensuring the temperature environment required for crop growth.
[0061] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.
Claims
1. A solar greenhouse water circulation underground sand and gravel heat storage and insulation system, the solar greenhouse comprising a north wall (1) on the north side of the greenhouse and a south roof membrane on the south side of the greenhouse, wherein a rollable insulation blanket is provided on the south roof membrane; the solar greenhouse is arranged in an east-west direction, the span direction of the greenhouse is in a north-south direction, and the greenhouse crops (4) in the soil (8) in the greenhouse are planted in an east-west ridge pattern; and the system is characterized in that: The solar greenhouse water circulation underground sand and stone heat storage and insulation system includes a plurality of identical component units and circulation pipelines; A single component unit comprises a light energy conversion-hot water storage and release pipe (2) and a heat storage box (3) installed on the inner surface of the north wall (1) of the greenhouse; The heat storage boxes (3) are buried side by side in the soil (8); the individual heat storage boxes (3) are arranged in parallel along the span direction of the greenhouse, i.e., the north-south direction; the root ends of the greenhouse crops (4) are at a certain distance from the upper surface of the heat storage boxes (3); The heat storage box (3) comprises an extruded heat insulation board (5), a heat energy storage-hot water storage and discharge pipe (6) and a heat storage medium (7); A heat storage-storage-discharge hot water pipe (6) is installed inside the heat storage box (3); the water inlet of the heat storage-storage-discharge hot water pipe (6) is connected to the water outlet of the light energy conversion-storage-discharge hot water pipe (2) through a water outlet pipe (12); the water outlet of the heat storage-storage-discharge hot water pipe (6) is connected to the water inlet of the light energy conversion-storage-discharge hot water pipe (2) through a water inlet pipe (9); the heat storage-storage-discharge hot water pipe (6) inside the heat storage box (3) is arranged in multiple layers in a serpentine structure; The interior of the heat storage box (3) is filled with pebbles and sand as a heat storage medium (7); The heat storage box (3) is surrounded by extruded insulation boards (5) for heat preservation; Evenly arranged heat dissipation holes (16) are provided on the extruded heat insulation board (5) on the upper surface of the heat storage box (3); A light energy conversion-hot water storage and release pipe (2) is installed on the inner surface of the north wall (1) of the greenhouse; The water inlet pipe (9) is provided with a circulating water pump (11); the automatic control system (13) is electrically connected to the circulating water pump (11); the automatic control system (13) regulates the operating state of the circulating water pump (11); and the water outlet pipe (12) is provided with a flow meter (14) and a temperature monitoring device (15).
2. The solar greenhouse water circulation underground sand and gravel heat storage and insulation system according to claim 1, characterized in that: The linear interval between two adjacent heat storage boxes (3) is 1.5 meters.
3. The solar greenhouse water circulation underground sand and gravel heat storage and insulation system according to claim 1, characterized in that: The root ends of the greenhouse crops (4) are 10 centimeters away from the upper surface of the heat storage box (3).
4. The solar greenhouse water circulation underground sand and gravel heat storage and insulation system according to claim 1, characterized in that: The heat energy storage-hot water storage and discharge pipe (6) has a four-layer structure from top to bottom, and each layer is designed as a serpentine loop.
5. The solar greenhouse water circulation underground sand and gravel heat storage and insulation system according to claim 1, characterized in that: A water pipe fixing bracket (10) is provided at the upper and lower parts of the light energy conversion-hot water storage and release pipe (2); the water pipe fixing bracket (10) is fixedly installed on the north wall (1) of the greenhouse via expansion bolts; the water pipe fixing bracket (10) is designed in an arched circular shape, with a semicircular cast iron part in the middle that is larger than the radius of the water pipe, and bolt holes are provided at both ends for fixed installation.
6. The solar greenhouse water circulation underground sand and gravel heat storage and insulation system according to claim 1, characterized in that: The automatic control system (13) adopts the AOKE water pump automatic controller commonly used in the market to automatically control the operating status of the water pump.
7. The solar greenhouse water circulation underground sand and gravel heat storage and insulation system according to claim 1, characterized in that: The thermal energy storage-hot water storage and discharge pipe (6), the water inlet pipe (9) and the water outlet pipe (12) are made of TP2 copper with a purity of 99.9%.