Clean energy supply for gobi greenhouse heat compensation system

Abstract

The utility model relates to the technical field of greenhouse heat supplement, specifically relates to a clean energy supply gobi greenhouse heat compensation system, be suitable for the assembly type sunlight greenhouse of desert area, include heat collecting device, heat storage device and heat releasing device, heat collecting device includes solar collector and air source heat pump, solar collector is configured to collect the radiant energy of sun in the daytime, utilizes circulating water flow and heat storage device and carries out heat exchange, forms external heat storage, air source heat pump is configured to collect the redundant heat in assembly type sunlight greenhouse in the daytime, utilizes circulating water flow and heat storage device and carries out heat exchange, forms internal heat storage, the heat preservation water tank of heat storage device links up with solar collector, air source heat pump and heat releasing device respectively through pipeline, heat releasing device is configured to release the heat stored in heat preservation water tank to assembly type sunlight greenhouse in the night, forms heat compensation to greenhouse, improves the heat preservation effect of assembly type sunlight greenhouse in the night.

Description

Technical Field

[0001] This utility model relates to the field of greenhouse heat compensation technology, specifically to a clean energy supply system for heat compensation in Gobi greenhouses. Background Technology

[0002] The Gobi Desert region has abundant solar radiation and thermal energy resources. As the core carrier of facility agriculture, the solar greenhouse utilizes natural light to achieve efficient crop cultivation. Its characteristics are highly compatible with the climate characteristics of the Gobi Desert region, which has long sunshine hours and large temperature differences between day and night. It can effectively overcome the limitations of the natural environment on agricultural production in this region.

[0003] Among them, prefabricated solar greenhouses have significant advantages over traditional brick-concrete solar greenhouses, such as high degree of structural modularity, flexible installation and disassembly, short construction period, and strong adaptability to complex terrain in Gobi Desert areas. They do not require large-scale foundation excavation and can quickly adjust the greenhouse layout and scale according to planting needs, which greatly reduces construction costs and environmental disturbance in Gobi Desert areas and is more suitable for use in Gobi Desert scenarios.

[0004] However, to achieve lightweight design and convenient installation, prefabricated greenhouses generally use thinner, flexible insulation walls. Compared to the thick walls of traditional brick-and-mortar greenhouses, their heat storage capacity is significantly insufficient. During winter nights and in extremely cold weather, prefabricated greenhouses struggle to maintain indoor temperatures, leading to slow crop growth and even frost damage resulting in crop failure. Therefore, there is an urgent need for those skilled in the art to develop a system that adapts to the structural characteristics of prefabricated greenhouses, utilizes abundant clean energy resources in the Gobi Desert, and achieves efficient and stable heat compensation to cope with sudden drops in indoor temperatures during winter and extremely cold weather. Summary of the Invention

[0005] The purpose of this invention is to provide a heat compensation system for the use of prefabricated solar greenhouses in the Gobi Desert region, so as to improve the heat storage capacity, solve the problem of rapid heat loss and sudden temperature drop in the greenhouse during winter nights and extreme cold weather, and improve the heat preservation effect of prefabricated solar greenhouses at night.

[0006] To achieve the above objectives, this utility model proposes a clean energy supply system for Gobi greenhouse heat compensation, which is suitable for prefabricated solar greenhouses in desert areas, including a heat collection device, a heat storage device, and a heat release device. The heat collection device includes a solar collector installed on the outside of the prefabricated greenhouse and an air source heat pump installed on the inside of the prefabricated greenhouse. The solar collector is configured to collect solar radiation energy during the day and exchange heat with the heat storage device using circulating water to form external heat storage. The air source heat pump is configured to collect excess heat inside the prefabricated greenhouse during the day and exchange heat with the heat storage device using circulating water to form internal heat storage. The heat storage device includes an insulated water tank buried underground in the prefabricated greenhouse. The insulated water tank is connected to a solar collector, an air source heat pump, and a heat release device via pipelines. The heat release device is configured to release the heat stored in the insulated water tank into the prefabricated solar greenhouse at night, thereby compensating for the heat inside the greenhouse.

[0007] The system utilizes solar energy and surplus air heat from the greenhouse through a heat collection device. This approach leverages the abundant sunshine resources of the Gobi Desert while avoiding pollution emissions associated with traditional heating methods. This reduces the energy costs and environmental burden of greenhouse operation. During the day, heat is stored in the insulated water tank through both external heat collection and internal waste heat recovery, making full use of daytime energy surplus. At night, the stored heat is released directionally through a heat release device, enabling time-of-day energy scheduling for heat storage during the day and heat use at night. This avoids energy waste and improves overall energy efficiency.

[0008] Preferably, the heat release device includes an underground pipeline buried in the planting area of ​​the prefabricated solar greenhouse. The underground pipeline is connected to an insulated water tank and is configured to release heat into the greenhouse through ground radiation by forming a circulating water flow with the insulated water tank under the drive of a power pump.

[0009] Preferably, the outside of the insulated water tank is covered with an insulation layer to prevent heat loss.

[0010] Preferably, the interior of the insulated water tank is also equipped with an electric heating element for auxiliary heating.

[0011] Preferably, the underground pipeline includes a main pipeline, branch pipelines and a return pipeline. The main pipeline is used to introduce the circulating water in the insulated water tank into the branch pipelines. The branch pipelines are used to release heat into the greenhouse through ground radiation. The return pipeline is used to collect the circulating water in the branch pipelines and introduce it back into the insulated water tank.

[0012] Preferably, the main pipe is laid along the length of the prefabricated greenhouse, and multiple branch pipes are arranged in a linear array along the axis of the main pipe to form a branch pipe unit. A pair of branch pipe units are arranged symmetrically along the axis of the main pipe.

[0013] As a preferred option, the air source heat pump fabric is installed close to the north wall of the prefabricated greenhouse.

[0014] As a preferred option, the solar collector is a vacuum tube collector.

[0015] Compared with existing technologies, the clean energy supply system for Gobi greenhouses provided by this utility model has the following substantial features and advancements: This clean energy supply system for Gobi greenhouses is adapted to the structural characteristics of prefabricated solar greenhouses in desert areas. The solar collectors are installed outdoors, the air source heat pump and heat dissipation device are installed indoors, and the insulated water tank is buried underground. All components are connected by pipelines, making installation convenient and not damaging the original prefabricated structure of the greenhouse. It also reduces the difficulty of later maintenance and adjustment, and has strong applicability. Through the synergistic heat collection design of the solar collectors and air source heat pumps, combined with the large-capacity heat storage of the underground insulated water tank, the heat storage capacity of the Gobi greenhouse is greatly improved. This effectively solves the problem of rapid heat loss and sudden temperature drop in the greenhouse during winter nights and extreme cold weather, significantly improves the nighttime heat preservation effect, and provides a stable temperature environment for greenhouse crop growth. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of a clean energy supply system for heat compensation in a Gobi greenhouse, as described in this utility model embodiment.

[0017] Figure 2 This is a schematic diagram of the layout structure of the underground pipeline in an embodiment of this utility model.

[0018] Attached reference numerals: 1. Prefabricated greenhouse; 2. North wall side; 3. Solar collector; 4. Air source heat pump; 5. Insulated water tank; 6. Buried pipeline; 7. Planting area; 61. Main pipeline; 62. Branch pipeline; 63. Return pipeline. Detailed Implementation

[0019] The specific embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0020] Currently, in the Gobi Desert region, prefabricated greenhouses generally use thinner flexible insulation walls to achieve lightweighting and convenient installation. Compared to the thick walls of traditional brick-concrete greenhouses, their heat storage capacity is significantly insufficient. During winter nights and in extremely cold weather, prefabricated greenhouses struggle to maintain indoor temperatures, leading to slow crop growth and even frost damage causing crop failure. This utility model proposes a clean energy supply system for Gobi greenhouse heat compensation, aiming to improve heat storage capacity, solve the problem of rapid heat loss and sudden temperature drops inside the greenhouse during winter nights and in extremely cold weather, and improve the insulation effect of prefabricated greenhouses at night.

[0021] like Figure 1 and Figure 2As shown, a clean energy supply system for Gobi greenhouse heat compensation is adapted to prefabricated solar greenhouse 1 in desert areas, including a heat collection device, a heat storage device and a heat release device.

[0022] like Figure 1 As shown, the heat collection device includes a solar collector 3 installed on the outside of the prefabricated greenhouse 1 and an air source heat pump 4 installed on the inside of the prefabricated greenhouse 1.

[0023] The solar collector 3 is configured to collect solar radiation during the day and exchange heat with the heat storage device using circulating water to form external heat storage.

[0024] The air source heat pump 4 is configured to collect excess heat in the prefabricated greenhouse 1 during the day and exchange heat with the heat storage device through circulating water flow to form internal heat storage.

[0025] like Figure 1 As shown, the heat storage device includes an insulated water tank 5 buried underground in the prefabricated solar greenhouse 1. The insulated water tank 5 is connected to the solar collector 3, the air source heat pump 4 and the heat release device through pipelines.

[0026] The heat release device is configured to release the heat stored in the insulated water tank 5 into the prefabricated solar greenhouse 1 at night, thereby compensating for the heat inside the greenhouse.

[0027] For example, a clean energy supply system for heat compensation in Gobi Desert greenhouses is designed for prefabricated solar greenhouses in the northwestern desert regions of my country. The greenhouse dimensions are 60m long, 12m wide, and 3.5m high. The system aims to address the problem of rapid heat loss and sudden temperature drops during winter nights and extreme cold weather in this region, ensuring a stable temperature environment for greenhouse crop cultivation. The system comprises heat collection devices, heat storage devices, and heat release devices, all connected in series via pipelines to form a closed-loop heat circulation system, enabling heat management through daytime heat storage and nighttime heat release.

[0028] Among them, solar collector 3 adopts a vacuum tube collector with a model of Φ58×1800mm, with a total of 20 sets. It is installed at an angle along the outdoor ground on the south side of the prefabricated solar greenhouse 1. Each set of collectors has a light-receiving area of ​​2.5㎡, with a total light-receiving area of ​​50㎡. When the solar radiation intensity is ≥500W / ㎡ during the day, the collector absorbs solar radiation energy and heats the internal circulating water to 40-50℃. The water is then transported to the heat storage device through DN32 galvanized steel pipes to complete the external heat storage.

[0029] For example, a DN32 main pipe is led out from the outlet of solar collector 3, connected in series with a temperature sensor for measuring the outlet water temperature of solar collector 3, and a one-way valve for preventing hot water backflow from insulated water tank 5, and finally connected to the solar collector inlet at the top of insulated water tank 5. Furthermore, a DN32 main pipe is led out from the solar collector return outlet at the bottom of insulated water tank 5, connected in series with a 0.75kW circulation pump and an electric ball valve, and finally connected to the inlet of solar collector 3.

[0030] When the outlet water temperature of solar collector 3 is more than 5°C higher than the water temperature in the water tank, the electric ball valve opens and the circulation pump starts, forming a heat cycle from solar collector 3 to the insulated water tank 5; it automatically shuts off when the temperature difference is ≤2°C to avoid ineffective circulation.

[0031] Two air source heat pump units with a heating capacity of 5kW are selected and installed near the north wall of the prefabricated greenhouse 1 at a height of 1.2m to avoid obstructing the southern sunlight area. During the day, when the temperature inside the greenhouse rises to 25-30℃ due to solar radiation, the heat pump starts, absorbs excess heat from the air inside the greenhouse, heats the circulating water to 35-40℃, and transports it to the heat storage device through DN25 PPR pipes to achieve internal heat recovery and storage.

[0032] For example, a DN25 main pipe is led out from the outlet of air source heat pump 4, connected in series with an electronic expansion valve for flow regulation and a check valve, and then connected to the heat pump inlet on the side wall of insulated water tank 5. A DN25 main pipe is led out from the heat pump return port on the side wall of insulated water tank 5, connected in series with a 0.55kW circulating pump, and then connected to the inlet of air source heat pump 4. The operation of air source heat pump 4 is linked to the greenhouse temperature sensor. When the greenhouse temperature is ≥25℃, the circulating pump and electronic expansion valve are activated to transfer waste heat into insulated water tank 5; when the greenhouse temperature is ≤20℃, it automatically shuts down to prioritize crop growth temperature.

[0033] The heat storage device uses a 5m³ stainless steel insulated water tank 5, which is buried 1.5m underground in the prefabricated solar greenhouse 1, avoiding the greenhouse foundation structure. It is connected to the solar collector 3, the air source heat pump 4, and the heat release device through three pipelines. The outside of the insulated water tank 5 is covered with a 50mm thick polyurethane insulation layer, and the insulation layer is wrapped with an aluminum foil reflective film to reduce heat loss.

[0034] To further ensure the insulation performance of the thermal compensation system, two sets of 3kW electric heating elements are installed at the bottom of the insulated water tank 5. When the water temperature in the tank drops below 25℃ due to continuous cloudy weather or extreme low temperatures, the electric heating components will automatically start to raise the water temperature to 30℃, ensuring the heat release needs at night.

[0035] like Figure 1 and Figure 2As shown, the heat dissipation device is a buried pipeline 6, installed 0.3m underground in the greenhouse planting area 7. The buried pipeline 6 includes a main pipeline 61, branch pipelines 62, and a return pipeline 63. The main pipeline 61 is used to guide the circulating water in the insulated water tank 5 into the branch pipeline 62. The branch pipeline 62 is used to release heat into the greenhouse through ground radiation. The return pipeline 63 is used to collect the circulating water in the branch pipeline 62 and guide it back to the insulated water tank 5.

[0036] like Figure 2 As shown, the main pipe 61 is laid along the length of the prefabricated greenhouse 1. Multiple branch pipes 62 are arranged in a linear array along the axial direction of the main pipe 61 to form branch pipe units. A pair of branch pipe units are arranged symmetrically along the axis of the main pipe 61.

[0037] When the heat release device is working, the 1.5kW power pump is started. The hot water at 30-35℃ in the insulated water tank 5 is distributed to each branch pipe 62 through the main pipe 61. When the hot water flows in the branch pipe 62, it releases radiant heat to the greenhouse through the soil, so that the soil temperature in the planting area 7 is maintained at 12-15℃ and the air temperature is maintained at 10-13℃. The circulating water that has cooled down to 20-25℃ after releasing heat is collected through the return pipe 63 and flows back to the insulated water tank 5, completing the heat release cycle.

[0038] When the clean energy supply system for Gobi greenhouse heat compensation proposed in this embodiment is used, during the daytime heat storage phase (9:00-17:00), the solar collector 3 absorbs solar radiation energy, heats the circulating water and delivers it to the insulated water tank 5 to store external heat; the air source heat pump 4 absorbs excess air heat in the greenhouse, heats the circulating water and delivers it to the insulated water tank 5 to replenish internal heat; the water temperature in the insulated water tank 5 gradually rises to 40-45℃, and when the water temperature exceeds 45℃, the system automatically shuts down the heat collection device to prevent the water temperature from becoming too high.

[0039] During the nighttime heat release phase (18:00-6:00 the next day), the power pump starts, and the hot water in the insulated water tank 5 circulates through the underground pipe 6. The branch pipe 62 releases radiant heat to the planting area 7 to compensate for the heat loss in the greenhouse. If the water temperature in the tank is lower than 25℃, the electric heating component will start automatically to maintain a stable water temperature.

[0040] In extreme weather emergencies, such as continuous cloudy days, the solar collector 3's heat collection efficiency decreases, and the air source heat pump 4 works in conjunction with the electric heating components to maintain the water tank's heat storage temperature. When the outdoor temperature is below -20℃, the electric heating components continue to operate to ensure that the temperature inside the greenhouse does not fall below 8℃ after releasing heat at night.

[0041] Based on the above implementation method, in addition to the buried pipeline 6, the heat release device can also use fan coil units, which are suitable for scenarios where the greenhouse space is high and the air temperature needs to be rapidly increased. For example, in a seedling greenhouse, the temperature needs to be maintained at 15-18℃ at night.

[0042] This utility model is not limited to the specific technical solutions described in the above embodiments. Besides the above embodiments, this utility model may have other implementation methods. For those skilled in the art, any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A clean energy supply system for heat compensation in a Gobi Desert greenhouse, characterized in that, Prefabricated solar greenhouses suitable for desert regions include heat collection devices, heat storage devices, and heat release devices; The heat collection device includes a solar collector installed on the outside of the prefabricated greenhouse and an air source heat pump installed on the inside of the prefabricated greenhouse. The solar collector is configured to collect solar radiation energy during the day and exchange heat with the heat storage device using circulating water to form external heat storage. The air source heat pump is configured to collect excess heat inside the prefabricated greenhouse during the day and exchange heat with the heat storage device using circulating water to form internal heat storage. The heat storage device includes an insulated water tank buried underground in the prefabricated greenhouse. The insulated water tank is connected to a solar collector, an air source heat pump, and a heat release device via pipelines. The heat release device is configured to release the heat stored in the insulated water tank into the prefabricated solar greenhouse at night, thereby compensating for the heat inside the greenhouse.

2. The clean energy supply system for Gobi greenhouse heat compensation according to claim 1, characterized in that, The heat release device includes a buried pipeline, which is buried underground in the planting area of ​​the prefabricated solar greenhouse. The buried pipeline is connected to an insulated water tank and is configured to release heat into the greenhouse through ground radiation by forming a circulating water flow with the insulated water tank under the drive of a power pump.

3. The clean energy supply system for Gobi greenhouse heat compensation according to claim 1, characterized in that, The outside of the insulated water tank is covered with an insulation layer to prevent heat loss.

4. The clean energy supply system for Gobi greenhouse heat compensation according to claim 1, characterized in that, The insulated water tank is also equipped with an electric heating component for auxiliary heating.

5. The clean energy supply system for Gobi greenhouse heat compensation according to claim 2, characterized in that, The underground pipeline includes a main pipeline, branch pipelines, and a return pipeline. The main pipeline is used to guide the circulating water in the insulated water tank into the branch pipelines. The branch pipelines are used to release heat into the greenhouse through ground radiation. The return pipeline is used to collect the circulating water in the branch pipelines and guide it back to the insulated water tank.

6. The clean energy supply system for Gobi greenhouse heat compensation according to claim 5, characterized in that, The main pipeline is laid along the length of the prefabricated solar greenhouse, and multiple branch pipelines are arranged in a linear array along the axis of the main pipeline to form a branch pipeline unit. A pair of branch pipeline units are arranged symmetrically along the axis of the main pipeline.

7. The clean energy supply system for Gobi greenhouse heat compensation according to claim 1, characterized in that, The air source heat pump cloth is installed near the north wall of the prefabricated greenhouse.

8. The clean energy supply system for Gobi greenhouse heat compensation according to claim 1, characterized in that, The solar collector is a vacuum tube collector.

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