Solar greenhouse system for solar long-term soil-hydrated salt heat storage and supply

Abstract

The utility model relates to the technical field of solar greenhouse energy conservation, in particular to a solar long-term soil-hydrated salt heat storage and supply solar greenhouse system which comprises a greenhouse, a solar heat collection circulating unit, a soil-hydrated salt heat storage and supply unit and an automatic control unit. According to the system, solar heat collection and soil-hydrated salt composite heat storage and supply technologies are innovatively combined, and seasonal effective storage and utilization of solar energy are achieved. In the non-heating season with rich solar energy, the system efficiently collects solar energy through the heat collector and converts the solar energy into heat energy, and then heat energy is stored through the soil-hydrated salt mixed material and the high heat storage performance and excellent heat stability of soil. In the heating season, the stored heat energy is released to the greenhouse, and a stable heat source is provided for crop growth. The system has the advantages of being high in energy efficiency, environmentally friendly, sustainable and the like, is suitable for sunlight greenhouses under various weather conditions, and has important significance in promoting green agriculture and renewable energy source application.

Description

Technical Field

[0001] The utility model relates to the technical field of solar greenhouse energy saving, in particular to a solar greenhouse system for long-term soil-hydrated salt heat storage and heating using solar energy. Background Art

[0002] As a clean and renewable energy source, solar energy has broad application prospects in the field of heat storage and heating in solar greenhouses. However, due to the intermittent and unstable nature of solar energy, how to realize the seasonal utilization of solar energy to meet the needs of year-round operation of solar greenhouses is an urgent problem to be solved. At the same time, soil-hydrated salt thermal storage and heating technology has also been a hot topic of research in recent years. Combining solar energy utilization technology with soil-hydrated salt thermal storage and heating technology, that is, in the non-heating season when solar energy is abundant, using solar collectors to effectively convert solar energy into thermal energy and store it in the soil-hydrated salt thermal storage layer and the soil thermal storage layer, and then releasing the heat in the heating season to provide a stable heat source for the greenhouse and maintain the normal growth of vegetation in the solar greenhouse.

[0003] In the process of modern agricultural production, the yield of crops will be affected due to weather restrictions. The application of solar greenhouses plays an important role in increasing crop yields and improving the quality of agricultural products. However, in winter and northern regions, since the temperature in the solar greenhouse cannot meet the natural and normal growth of crops, it is necessary to add heating facilities in the greenhouse. Traditional solar greenhouse heating methods usually rely on fossil energy, which not only has high energy consumption and high operating costs, but also has environmental pollution problems. Therefore, the development of an efficient and sustainable solar greenhouse heat storage and heating system is of great significance to promoting the sustainable development of facility agriculture. Utility Model Content

[0004] The utility model provides a solar greenhouse system for long-term soil-hydrated salt heat storage and heating, so as to solve the problems in the prior art.

[0005] The technical problem solved by the utility model is achieved by adopting the following technical solutions:

[0006] A solar greenhouse system for long-term soil-hydrated salt heat storage and heating, comprising a greenhouse, and also comprising:

[0007] A solar heat collection circulation unit, the solar heat collection circulation unit comprising a flat plate collector installed on the greenhouse and a circulating water supply part connected to the flat plate collector, and a temperature sensor is also installed in the greenhouse;

[0008] A soil-hydrated salt heat storage and heating unit, wherein the soil-hydrated salt heat storage and heating unit adopts layered heat storage, and a pebble insulation layer is used between the upper and lower layers for heat insulation, the upper layer is a soil-hydrated salt short-term heat storage layer, and the lower layer is a soil long-term heat storage layer. A heat exchange buried pipe is arranged in the soil-hydrated salt heat storage and heating unit, and the heat exchange buried pipe is connected to a circulating water supply unit;

[0009] The automatic control unit includes a controller temperature sensor installed in the greenhouse, and a circulating water supply unit electrically connected to the controller.

[0010] In a specific embodiment, the circulating water supply unit includes a water collector, a water distributor, a water supply tank, a circulation pump and a three-way solenoid valve, the flat plate collector is connected to the water distributor, the water collector is connected to the water supply tank, and the water supply tank is connected to the flat plate collector;

[0011] The circulation pumps are installed on the connecting pipes between the flat plate collector and the water supply tank and on the connecting pipes between the upper and lower water collectors;

[0012] The three-way solenoid valves are respectively installed at the connection between the flat plate collector and the upper and lower water distributors, and at the connection between the lower water collector and the water supply tank and the upper water collector.

[0013] In a specific embodiment, the temperature sensor includes a temperature sensor A installed at the outlet of the flat plate collector, which is used to monitor the water temperature at the outlet of the flat plate collector;

[0014] Temperature sensor B installed in the soil-hydrated salt short-term heat storage layer and temperature sensor C installed in the soil long-term heat storage layer are used to monitor the temperature changes of different heat storage layers;

[0015] The temperature sensor D, which is hung in the center of the greenhouse, is used to monitor the overall temperature in the greenhouse;

[0016] The temperature sensor E installed in the planting layer is used to monitor the temperature of the crop growth environment.

[0017] In a specific embodiment, the heat exchange buried pipe includes an upper heat exchange buried pipe laid in the soil-hydrated salt short-term heat storage layer and a lower heat exchange buried pipe laid in the soil long-term heat storage layer, and the two ends of the heat exchange buried pipe are respectively connected to a water distributor and a water collector.

[0018] In a specific embodiment, the greenhouse includes a rear wall and an insulation layer installed on the rear wall, a rear roof is installed on the upper end of the rear wall, a roller blind is installed on the rear roof, and a greenhouse film is installed on the greenhouse.

[0019] The beneficial effects of the utility model are:

[0020] In the non-heating season when solar energy is abundant, the system efficiently collects solar energy through flat-plate collectors and converts it into heat energy. Then, the soil-hydrated salt mixed material, the high heat storage performance of the soil and the excellent thermal stability are used to store the heat energy. In the heating season, the stored heat energy is released to the greenhouse to provide a stable heat source for crop growth. It has the advantages of high energy efficiency, environmental protection and sustainability, and is suitable for solar greenhouses under various climatic conditions. It is of great significance to promote green agriculture and the application of renewable energy. The solar greenhouse system with long-term soil-hydrated salt heat storage and heating can efficiently collect solar energy and convert it into heat energy and store it in soil and hydrated salt. This direct use of solar energy is not only environmentally friendly, but also can significantly reduce the dependence of greenhouse operation on external energy. At the same time, the stable heating capacity also helps to reduce the reduction and loss of crops caused by low temperatures, and has made positive contributions to the sustainable development of agriculture and the protection of the ecological environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the implementation scheme of the utility model or the technical scheme in the prior art, the drawings required for use in the implementation scheme or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some implementation schemes of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0022] Figure 1 This is a schematic diagram of a solar greenhouse system for long-term soil-hydrated salt heat storage and heating according to the utility model.

[0023] Figure 2 This is a schematic structural diagram of a solar greenhouse system for long-term soil-hydrated salt heat storage and heating according to the utility model.

[0024] Figure 3 This is a cross-sectional view of a solar greenhouse system for long-term soil-hydrated salt heat storage and heating according to the utility model.

[0025] In the figure: 1. controller; 2. circulation pump; 3. flat plate collector; 4. temperature sensor A; 5. water distributor; 6. water supply tank; 7. temperature sensor B; 8. temperature sensor C; 9. upper layer heat exchange buried pipe; 10. water collector; 11. lower layer heat exchange buried pipe; 12. roller shutter; 13. rear roof; 14. rear wall; 15. insulation layer; 16. soil-hydrated salt short-term heat storage layer; 17. pebble insulation layer; 18. soil long-term heat storage layer; 19. temperature sensor D; 20. greenhouse film; 21. temperature sensor E; 22. three-way solenoid valve. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solutions and advantages of the implementation methods of this application clearer, the technical solutions in the implementation methods of this application will be clearly and completely described below in conjunction with the drawings in the implementation methods of this application. Obviously, the described implementation methods are part of the implementation methods of this application, not all of the implementation methods. Based on the implementation methods in this application, all other implementation methods obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0027] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for protection, but merely represents the selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0028] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0029] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0030] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0031] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0032] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0033] Reference Figure 1-3 As shown, the utility model provides a solar greenhouse system for long-term soil-hydrated salt heat storage and heating, including a greenhouse, and also including:

[0034] A solar heat collection circulation unit, which includes a flat plate collector 3 installed on the greenhouse and a circulating water supply part connected to the flat plate collector 3. A temperature sensor is also installed in the greenhouse;

[0035] Soil-hydrated salt heat storage and heating unit, the soil-hydrated salt heat storage and heating unit adopts layered heat storage, and a pebble insulation layer 17 is used between the upper and lower layers for heat insulation, the upper layer is a soil-hydrated salt short-term heat storage layer 16, and the lower layer is a soil long-term heat storage layer 18. A heat exchange buried pipe is arranged in the soil-hydrated salt heat storage and heating unit, and the heat exchange buried pipe is connected to the circulating water supply part;

[0036] The automatic control unit includes a controller 1 installed in the greenhouse, a temperature sensor, and a circulating water supply unit electrically connected to the controller 1.

[0037] The solar energy is collected by the flat plate collector 3 of the solar heat collection circulation unit, converted into heat energy and stored in the upper soil-hydrated salt short-term heat storage layer 16 and the lower soil long-term heat storage layer 18. When the interior of the greenhouse needs to be heated, the upper soil-hydrated salt short-term heat storage layer 16 and the lower soil long-term heat storage layer 18 release heat energy to provide stable heat energy for the greenhouse and a suitable growth environment for crops. The solar greenhouse system with long-term soil-hydrated salt heat storage and heating can efficiently collect solar energy and convert it into heat energy and store it in the soil and hydrated salt. This direct use of solar energy is not only environmentally friendly, but also can significantly reduce the dependence of greenhouse operation on external energy. At the same time, the stable heating capacity also helps to reduce the reduction and loss of crops caused by low temperatures, making a positive contribution to the sustainable development of agriculture and the protection of the ecological environment.

[0038] As a further preferred embodiment of the above embodiment, the circulating water supply unit includes a water collector 10, a water distributor 5, a water supply tank 6, a circulating pump 2 and a three-way solenoid valve 22, the flat plate collector 3 is connected to the water distributor 5, the water collector 10 is connected to the water supply tank 6, and the water supply tank 6 is connected to the flat plate collector 3;

[0039] The circulation pump 2 is installed on the connecting pipelines between the flat plate collector 3 and the water supply tank 6 and on the connecting pipelines between the upper and lower water collectors;

[0040] The three-way solenoid valve 22 is respectively installed at the connection between the flat plate collector 3 and the upper and lower water distributors, and at the connection between the lower water collector and the water supply tank 6 and the upper water collector.

[0041] As a further preferred embodiment of the above embodiment, the temperature sensor includes a temperature sensor A4 installed at the outlet of the flat plate collector 3, which is used to monitor the water temperature at the outlet of the flat plate collector 3;

[0042] The temperature sensor B7 installed in the soil-hydrated salt short-term heat storage layer 16 and the temperature sensor C8 installed in the soil long-term heat storage layer 18 are used to monitor the temperature changes of different heat storage layers;

[0043] The temperature sensor D19, which is hung in the center of the greenhouse, is used to monitor the overall temperature in the greenhouse;

[0044] The temperature sensor E21 installed in the planting layer is used to monitor the temperature of the crop growth environment.

[0045] As a further preference of the above embodiment, the heat exchange buried pipe includes an upper heat exchange buried pipe 9 laid in the soil-hydrated salt short-term heat storage layer 16 and a lower heat exchange buried pipe 11 laid in the soil long-term heat storage layer 18, and the two ends of the heat exchange buried pipe are respectively connected to the water distributor 5 and the water collector 10.

[0046] As a further preferred embodiment of the above embodiment, the greenhouse includes a rear wall 14 and an insulation layer 15 installed on the rear wall 14, a rear roof 13 is installed on the upper end of the rear wall 14, a roller shutter 12 is installed on the rear roof 13, and a greenhouse film 20 is installed on the greenhouse.

[0047] When the solar heat collection circulation unit is working, the circulation pump 2 is turned on, the flat plate collector 3 captures solar energy and converts it into heat energy, and the heat energy is transported to the heat energy storage device through the pipeline for storage. The working fluid after heat exchange flows through the water replenishment tank 6 and enters the flat plate collector 3 again for heat collection, and the cycle continues.

[0048] During heat storage, the working fluid in the flat plate collector 3 flows into the upper heat exchange buried pipe through the upper water distributor first, and then exchanges heat with the soil-hydrated salt short-term heat storage layer. When the temperature of the soil-hydrated salt short-term heat storage layer reaches the set value (30°C, which can be set according to different crops), heat storage stops; at this time, the working fluid in the flat plate collector flows into the lower heat exchange buried pipe through the lower water distributor, exchanges heat with the soil long-term heat storage layer, and stores heat in the soil. During heating, the upper soil-hydrated salt short-term heat storage layer adopts passive heat release to maintain the temperature of the plant roots (25°C, which can be set according to different crops) stable. When the temperature of the upper soil-hydrated salt short-term heat storage layer is lower than the set value (30°C), the pipeline of the lower soil long-term heat storage layer is connected with the pipeline of the upper soil-hydrated salt short-term heat storage layer to transfer heat to the upper layer. When the indoor temperature is lower than the greenhouse set value (16°C, which can be set according to different crops), the heat stored in the long-term heat storage layer of the lower soil is released to the working fluid in the lower heat exchange buried underground. The working fluid flows into the flat plate collector through the water collector, and the heat will be released through the flat plate collector to increase the indoor temperature.

[0049] All temperature sensors are connected to the controller 1 and transmit the monitored temperature signals to the controller 1 in real time. The controller 1 adjusts the working states of the circulation pump 2 and the three-way solenoid valve 22 according to the received signals to realize intelligent control of the entire solar greenhouse system.

[0050] In the non-heating season when solar energy is abundant, the system efficiently collects solar energy through the flat plate collector 3 and converts it into heat energy, and then uses the soil-hydrated salt mixed material, the high heat storage performance of the soil and the excellent thermal stability to store the heat energy. In the heating season, the stored heat energy is released to the greenhouse to provide a stable heat source for crop growth. This system has the advantages of high energy efficiency, environmental protection, and sustainability. It is suitable for solar greenhouses under various climatic conditions and is of great significance for promoting green agriculture and the application of renewable energy.

[0051] The working principle of the solar greenhouse system with long-term soil-hydrated salt heat storage and heating is:

[0052] During heat storage, when the controller 1 receives temperature signals from the temperature sensor A and the temperature sensor B, which differ by 15°C, the controller 1 drives the circulation pump 2 ( Figure 1 The left side) is opened, and the working fluid in the water supply tank 6 enters the flat plate collector 3 for heat collection. When the temperature sensor B detects that the soil-hydrated salt short-term heat storage layer has not reached the set value (30°C), the controller 1 adjusts the three-way solenoid valve 22 ( Figure 1The working fluid after heat collection enters the upper water distributor 5 first, and then flows into the upper heat exchange buried pipe 9 to exchange heat with the soil-hydrated salt, and stores the heat in the soil-hydrated salt short-term heat storage layer 16. When the temperature sensor B detects that the soil-hydrated salt short-term heat storage layer reaches the set value (30°C), the controller 1 adjusts the three-way solenoid valve 22 ( Figure 1 On the right side), the working fluid after heat exchange enters the lower water distributor 5, and then flows into the lower heat exchange buried pipe 11 to exchange heat with the soil, and stores the heat in the soil long-term heat storage layer 18. The working fluid after heat exchange flows into the water collector 10, and then flows into the water replenishment tank 6 to enter the next heat collection cycle. The cycle works in this way to realize the layered heat storage work of the solar greenhouse.

[0053] During heating, when the temperature sensor D detects that the indoor temperature is lower than the set temperature of the solar greenhouse (16°C), the controller 1 drives the circulation pump 2 ( Figure 1 The left side) is opened, and the two groups of three-way solenoid valves 22 are adjusted to allow the heat stored in the soil long-term heat storage layer 18 to heat the working medium in the lower heat exchange buried pipe 11. The heated working medium flows through the lower water collector 10 through the water replenishment tank 6, and the working medium enters the flat plate collector 3 to release heat (at this time, the flat plate collector 3 acts as a radiator) to heat the indoor temperature. The working medium after heat release enters the lower heat exchange buried pipe 11 through the lower water distributor 5 to be heated again, and the next heat release cycle process is started to maintain a suitable indoor temperature.

[0054] When the temperature sensor E detects that the temperature of the planting layer is lower than the set value (25°C), the soil-hydrated salt short-term heat storage layer 16 will passively release heat to maintain the temperature of the plant roots. When the temperature sensor B detects that the temperature of the soil-hydrated salt short-term heat storage layer is lower than the set value (30°C), the controller 1 drives the circulation pump 2 ( Figure 1 The heat stored in the soil long-term heat storage layer 18 heats the working fluid in the lower heat exchange buried pipe 11, and the working fluid enters the upper heat exchange buried pipe 9 to transfer the heat to the soil-hydrated salt. The working fluid after releasing heat enters the lower heat exchange buried pipe 11 again to be heated.

[0055] When the temperature sensor D and the temperature sensor E do not reach the corresponding set values ​​at the same time, the controller 1 drives the two groups of circulation pumps 2 to start at the same time, and adjusts the two groups of three-way solenoid valves 22 to heat the indoor temperature and the soil-hydrated salt short-term heat storage layer at the same time. At this time, the heat stored in the soil long-term heat storage layer 18 heats the working fluid in the lower heat exchange buried pipe 11, and a part of the heated working fluid participates in the cycle of indoor temperature heating, and a part participates in the cycle of soil-hydrated salt short-term heat storage layer heating.

[0056] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. A solar greenhouse system for long-term soil-hydrated salt heat storage and heating, comprising a greenhouse, characterized in that: Also includes: A solar heat collection circulation unit, the solar heat collection circulation unit comprising a flat plate heat collector (3) installed on the greenhouse and a circulating water supply unit connected to the flat plate heat collector (3), and a temperature sensor is also installed in the greenhouse; A soil-hydrated salt heat storage and heating unit, wherein the soil-hydrated salt heat storage and heating unit adopts layered heat storage, a pebble insulation layer (17) is used between the upper and lower layers for heat insulation, the upper layer is a soil-hydrated salt short-term heat storage layer (16), and the lower layer is a soil long-term heat storage layer (18), a heat exchange buried pipe is arranged in the soil-hydrated salt heat storage and heating unit, and the heat exchange buried pipe is connected to a circulating water supply unit; An automatic control unit, the automatic control unit comprising a controller (1) installed in a greenhouse, a temperature sensor, and a circulating water supply unit electrically connected to the controller (1).

2. A solar greenhouse system for long-term soil-hydrated salt heat storage and heating according to claim 1, characterized in that: The circulating water supply unit comprises a water collector (10), a water distributor (5), a water supply tank (6), a circulating pump (2) and a three-way solenoid valve (22); the flat plate collector (3) is connected to the water distributor (5), the water collector (10) is connected to the water supply tank (6), and the water supply tank (6) is connected to the flat plate collector (3); The circulation pump (2) is respectively installed on the connecting pipelines between the flat plate collector (3) and the water supply tank (6) and on the connecting pipelines of the upper and lower water collectors; The three-way electromagnetic valve (22) is respectively installed at the connection between the flat plate collector (3) and the upper and lower water distributors, and at the connection between the lower water collector and the water supply tank (6) and the upper water collector.

3. A solar greenhouse system for long-term soil-hydrated salt heat storage and heating according to claim 2, characterized in that: The temperature sensor comprises a temperature sensor A (4) installed at the outlet of the flat plate collector (3) and used to monitor the water temperature at the outlet of the flat plate collector (3); A temperature sensor B (7) installed in the soil-hydrated salt short-term heat storage layer (16) and a temperature sensor C (8) installed in the soil long-term heat storage layer (18) are used to monitor temperature changes of different heat storage layers; A temperature sensor D (19) hung in the center of the greenhouse is used to monitor the overall temperature in the greenhouse; The temperature sensor E (21) installed in the planting layer is used to monitor the temperature of the crop growth environment.

4. A solar greenhouse system for long-term soil-hydrated salt heat storage and heating according to claim 3, characterized in that: The heat exchange buried pipe comprises an upper layer of heat exchange buried pipe (9) laid in a soil-hydrated salt short-term heat storage layer (16) and a lower layer of heat exchange buried pipe (11) laid in a soil long-term heat storage layer (18), and both ends of the heat exchange buried pipe are respectively connected to a water distributor (5) and a water collector (10).

5. A solar greenhouse system for long-term soil-hydrated salt heat storage and heating according to claim 1, characterized in that: The greenhouse comprises a rear wall (14) and a heat-insulating layer (15) installed on the rear wall (14); a rear roof (13) is installed on the upper end of the rear wall (14); a roller blind (12) is installed on the rear roof (13); and a greenhouse film (20) is installed on the greenhouse.

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