Heat cycle system for soilless culture
Through the combined heating of the heat pump unit and the solar water heater and the thermal circulation system of the buffer water tank, the problem of large electricity consumption of substrate heating in traditional soilless cultivation technology is solved, and the effect of reducing energy consumption and cost is achieved.
Patent Information
- Application Number
- CN202421439221.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-24
- Publication Date
- 2025-05-23
- Estimated Expiration
- 2034-06-24
AI Technical Summary
In traditional soilless cultivation technology, substrate heating consumes a lot of electricity, resulting in high costs.
The heat pump unit and solar water heater are used to provide heat for combined heating and buffer water tanks to form a thermal circulation system to reduce the cost of matrix heating.
Through the combined heating of the heat pump unit and the solar water heater, the energy consumption and cost of matrix heating are significantly reduced, and the buffer water tank ensures a stable heat supply.
Smart Images
Figure CN222888387U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of soilless cultivation, in particular to a heat circulation system for soilless cultivation. Background Art
[0002] Soilless cultivation refers to a cultivation method that uses water, peat, forest leaf mold or vermiculite as a medium for the plant's roots to fix the plant, so that the plant's roots can directly contact the nutrient solution. The composition of the nutrient solution in soilless cultivation is easy to control and can be adjusted at any time. In places with suitable light and temperature but no soil, such as deserts, beaches, and deserted islands, soilless cultivation can be carried out as long as there is a certain amount of fresh water supply.
[0003] In winter, soilless cultivation is usually used in conjunction with agricultural greenhouses to cultivate plants uninterruptedly. During this period, the use of greenhouse technology can ensure that the ambient temperature in the greenhouse is suitable. However, the roots of the plants are immersed or buried in the substrate (nutrient solution or nutrient soil). In winter, the substrate temperature is low and requires additional heating. Traditional soilless cultivation technology heats the substrate through electric heaters. This heating method consumes a lot of electricity, which to a certain extent increases the cost of soilless cultivation and the burden on growers. Utility Model Content
[0004] In view of the technical problem that the substrate heating method adopted in the above-mentioned traditional soilless cultivation technology is relatively costly, the utility model provides a low-cost heat circulation system for soilless cultivation.
[0005] In order to achieve the above-mentioned purpose, the utility model provides the following technical solutions: a heat circulation system for soilless cultivation, comprising: a plurality of cultivation floor heating plates, wherein the cultivation floor heating plates are at least partially buried in the matrix of the cultivated plants and include a water inlet for circulating water to flow in and a water outlet for circulating water to flow out; a heat pump unit, which can use an external heat source to heat the circulating water, and the heat pump unit has a cold source side inlet for circulating water to flow in and a cold source side outlet for circulating water to flow out; a solar water heater, which can use solar energy to heat the circulating water, and the solar water heater has a hot water supply for circulating water to flow in. The heat supply side inlet is fluidly connected to the cold source side outlet and the water heater outlet, the heat supply side outlet is fluidly connected to the cold source side inlet and the water heater inlet, the heat load side outlet is fluidly connected to the cold source side inlet and the water heater inlet, the heat load side outlet is fluidly connected to the water inlet of each of the cultivated floor heating sheets, and the heat load inlet is fluidly connected to the water outlet of each of the cultivated floor heating sheets.
[0006] In the above technical solution, preferably, the heat circulation system further comprises at least one water supply main road fluidly connected to the heat load side outlet and at least one water return main road fluidly connected to the heat load side inlet, the water inlet of each of the cultivation floor heating pieces is fluidly connected to the at least one water supply main road, and the water outlet of each of the cultivation floor heating pieces is fluidly connected to the at least one water return main road. It is also further preferred that the cultivation floor heating piece is equipped with a throttle valve to balance the fluid pressure at each of the cultivation floor heating pieces.
[0007] In the above technical solution, preferably, the heat circulation system also includes an electric heater adjacent to the heat load side outlet, the water inlet side fluid of the electric heater is connected to the heat load side outlet, and the water outlet side fluid of the electric heater is connected to each of the cultivation floor heating plates.
[0008] In the above preferred embodiment, further preferably, the thermal circulation system further includes a thermometer and a flow meter arranged between the electric heater and the buffer water tank.
[0009] In the above preferred scheme, further preferably, the heat circulation system also includes a bypass for circulating water to bypass the electric heater, the water inlet side fluid of the bypass is connected to the heat load side outlet, and the water outlet side fluid of the bypass is connected to the water inlet of each of the cultivation floor heating sheets.
[0010] In the above technical solution, preferably, the heat pump unit is a geothermal source heat pump unit and further includes a heat source side inlet for groundwater to enter and a heat source side outlet for groundwater to flow out.
[0011] Compared with the electric heating method used in traditional soilless cultivation, the heat circulation system provided by the technical solution of the utility model adopts a heat pump unit and a solar water heater for combined heating, which greatly reduces the cost of substrate heating. In addition, the buffer water tank can also accumulate a certain amount of water and heat to continuously and stably provide the required heat to the substrate of each cultivated plant. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 The system diagram of the heat circulation system for soilless cultivation provided by the utility model is shown; wherein the direction of the arrow indicates the direction of the circulating water.
[0013] Note in the figure:
[0014] 10. Shed structure; 20. Shed interior area; 30. Shed exterior area; 40. Geothermal well;
[0015] 1. Cultivated floor heating panels; 2. Heat pump unit; 3. Solar water heater; 4. Buffer water tank; 5. Main water supply line; 6. Main return water line; 7. Electric heater; 8. Bypass. DETAILED DESCRIPTION
[0016] In order to explain in detail the technical content, structural features, objectives and effects of the present application, the technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application.
[0017] In this application, spatially relative terms such as "under", "below", "under", "lower", "above", "upper", "above", "higher", "side" (for example, as in "sidewall"), etc., are used to describe the relationship of one element to another (other) element as shown in the accompanying drawings. The spatially relative terms are intended to include different orientations of the device in use, operation and / or manufacture in addition to the orientation depicted in the accompanying drawings. For example, if the device in the accompanying drawings is turned over, the elements described as "under" or "beneath" other elements or features will then be positioned as "above" the other elements or features. Therefore, the exemplary term "under" can include both above and below orientations. In addition, the device can be positioned otherwise (for example, rotated 90 degrees or at other orientations), so the spatially relative descriptors used herein are interpreted accordingly.
[0018] Figure 1 The heat circulation system of the user's soilless cultivation provided by the utility model is shown in the system diagram, which can use the external heat source to provide the heat required for the substrate of the cultivated plants to maintain its own temperature. Figure 1 As indicated by the solid frame line, the greenhouse structure 10 defines an inner area 20 of the agricultural greenhouse and an outer area 30 of the agricultural greenhouse.
[0019] As shown in the figure, the heat circulation system includes a plurality of cultivation floor heating pieces 1 arranged in the shed area 20, a floor heating heat pump unit 2 arranged in the shed area 30, a solar water heater 3 arranged in the shed area 30, and a warm flushing water tank also arranged in the shed area 30. Each cultivation floor heating piece 1 is at least partially buried in the substrate of the cultivated plant (not shown in the figure), for example: when the substrate of the cultivated plant is a nutrient solution, the cultivation floor heating piece 1 is at least partially submerged in the nutrient solution; when the substrate of the cultivated plant is nutrient soil, the cultivation floor heating piece 1 is at least partially buried in the nutrient soil.
[0020] Each cultivation floor heating sheet 1 has a water inlet for circulating water to flow in and a water outlet for circulating water to flow out. When circulating water flows through the cultivation floor heating sheet 1, heat can be provided to the substrate of the cultivated plants by heat conduction of the cultivation floor heating sheet 1 to maintain the substrate at a desired temperature.
[0021] The heat pump unit 2 can transfer part of the external heat to the circulating water to heat the circulating water. The heat pump unit 2 can be an air source heat pump unit, a water source heat pump unit or a geothermal source heat pump unit. Considering that this heat cycle system is mostly used in winter, during which period, the groundwater can still maintain a temperature above 20°C and is a high-quality heat source. Therefore, this embodiment uses a geothermal source heat pump unit.
[0022] Specifically, the heat pump unit 2 can use the groundwater in the geothermal well 40 as a heat source and transfer part of the heat of the groundwater outward. The heat pump unit 2 has a heat source side inlet for groundwater to flow in, a heat source side outlet for groundwater to flow out, a cold source side inlet for circulating water to flow in, and a cold source side outlet for circulating water to flow out. The heat source side inlet and the heat source side outlet of the heat pump unit 2 are both fluidically connected to the geothermal well 40.
[0023] The heat pump unit 2 has a compressor, a condenser, an expansion valve, an evaporator and other equipment, which can transfer part of the heat in the groundwater to the circulating water by using the reverse Carnot cycle to heat the circulating water. The specific structure and working principle of the heat pump unit 2 are common knowledge and will not be described in detail here.
[0024] The solar water heater 3 can receive the heat of solar energy and transfer the heat outwardly. The solar water heater 3 has a water heater inlet for circulating water to flow into and a water heater outlet for circulating water to flow out.
[0025] The buffer water tank 4 can store a certain amount of water and heat to continuously provide stable heat to each cultivation floor heating sheet 1. The buffer water tank 4 has a water storage chamber and a heat supply side inlet, a heat supply side outlet, a heat load side inlet and a heat load side outlet that are fluidly connected to the water storage chamber. Among them, the heat supply side outlet of the buffer water tank 4 is fluidly connected to the cold source side inlet of the heat pump unit 2 and the water heater inlet of the solar water heater 3 at the same time, so as to provide the heat pump unit 2 and the solar water heater 3 with circulating water that needs to be heated; the heat supply side inlet of the buffer water tank 4 is fluidly connected to the cold source side outlet of the heat pump unit 2 and the water heater outlet of the solar water heater 3 at the same time, so as to receive the circulating water heated by the heat pump unit 2 or / and the solar water heater 3; the heat load outlet of the buffer water tank 4 is fluidly connected to the water inlet of each cultivation floor heating sheet 1 to provide heat thereto; the heat load inlet of the buffer water tank 4 is fluidly connected to the water outlet of each cultivation floor heating sheet 1 to recover the circulating water after transferring heat to the outside.
[0026] Understandably, the heat circulation system provided by the present utility model uses a heat pump unit 2 and a solar water heater 3 as heat supply devices to provide heat for the substrate of the cultivated plants through each cultivation floor heating plate 1. Among them, the solar water heater 3 directly uses solar energy to heat the circulating water, while the heat pump unit 2 only needs to consume a small amount of energy to transfer part of the external heat to the circulating water. Therefore, compared with the traditional electric heating method that directly generates heat by relying on electricity, this heat circulation system can greatly reduce the cost of substrate heating.
[0027] The heat circulation system further includes a plurality of main water supply paths 5 and main water return paths 6 laid in the greenhouse area 20. The specific number of the main water supply paths 5 and the main water return paths 6 can be determined according to the arrangement mode of the cultivation floor heating plates 1 in the greenhouse area 20 (i.e., the arrangement mode of the cultivated plants). Taking this embodiment as an example, a plurality of cultivation floor heating plates 1 are arranged in two columns in the greenhouse area 20, and the heat circulation system is configured with 2 main water supply paths 5 and 2 main water return paths 6 corresponding to the number of columns.
[0028] Each main water supply path 5 is fluidly connected to the heat load side outlet of the buffer water tank 4, the water inlet of each cultivation floor heating plate 1 is fluidly connected to the corresponding main water supply path 5, the water outlet of each cultivation floor heating plate 1 is fluidly connected to the corresponding main water return path 6, and each main water return path 6 is fluidly connected to the heat load side inlet of the buffer water tank 4. Thus, the buffer water tank 4, the main water supply path 5, the cultivation floor heating plate 1, and the main water return path 6 are sequentially fluidly connected to form a loop for the circulating water to flow.
[0029] Furthermore, when the circulating water flows in the main water supply path 5, there is a certain frictional loss along the way, that is, the farther the cultivation floor heating plate 1 is from the heat load side outlet of the buffer water tank 4, the smaller the fluid pressure at the water inlet of the cultivation floor heating plate 1. As a result, the circulating water at some relatively distant cultivation floor heating plates 1 may not flow and cannot continuously output heat to the substrate. For this reason, in this embodiment, a throttle valve (not shown in the figure, the throttle valve can be set at the water inlet or the water outlet) is arranged at each cultivation floor heating plate 1 to selectively increase the throttling loss of the circulating water at this cultivation floor heating plate 1, so as to balance the fluid pressure at each cultivation floor heating plate 1. Generally speaking, the greater the throttling loss increased at the cultivation floor heating plate 1 closer to the heat load side outlet of the buffer water tank 4.
[0030] Considering that the substrate of each cultivated plant requires the circulating water to flow in at a stable temperature for a long time. In order to improve the stability of the thermal circulation system and avoid the interruption of heat supply when the heat pump unit 2 or the solar water heater 3 fails, the thermal circulation system is also equipped with an electric heater 7 adjacent to the downstream of the heat load outlet of the buffer water tank 4. The water inlet side fluid of the electric heater 7 is connected to the heat load side outlet of the buffer water tank 4, and the water outlet side fluid of the electric heater 7 is connected to each water supply main road 5, that is, the fluid is connected to the water inlet of each cultivation floor heating sheet 1.
[0031] Furthermore, the thermal circulation system is also provided with a thermometer (not shown in the figure) and a flow meter (not shown in the figure) between the buffer water tank 4 and the electric heater 7 to calculate the amount of heat that the electric heater 7 needs to provide.
[0032] Furthermore, considering that the electric heater 7 is rarely started, the thermal circulation system is also configured with a bypass for circulating water to bypass the electric heater to reduce the loss along the way when the circulating water flows normally. Specifically, the water inlet side fluid of the bypass 8 is connected to the heat load side outlet of the buffer water tank 4, and the water outlet side fluid of the bypass 8 is connected to each water supply main route 5, that is, the fluid is connected to the water inlet of each cultivation floor heating sheet 1. In practical applications, the switching between the bypass 8 and the waterway where the electric heater 7 is located can be achieved through a pair of three-way valves or a solenoid valve group.
[0033] The above embodiments are only for illustrating the technical concept and features of the present application, and their purpose is to enable people familiar with the technology to understand the content of the present application and implement it accordingly, and they cannot be used to limit the protection scope of the present application. Any equivalent changes or modifications made according to the spirit of the present application should be included in the protection scope of the present application.
Claims
1. A thermal circulation system for soilless cultivation, characterized in that: include: A plurality of cultivation floor heating sheets, wherein at least a portion of the cultivation floor heating sheets is buried in the substrate of the cultivated plants and comprises a water inlet for circulating water to flow in and a water outlet for circulating water to flow out; The heat pump unit can utilize an external heat source to heat the circulating water, and the heat pump unit has a cold source side inlet for the circulating water to flow in and a cold source side outlet for the circulating water to flow out; A solar water heater can utilize solar energy to heat circulating water, and the solar water heater has a water heater inlet for circulating water to flow in and a water heater outlet for circulating water to flow out; and A buffer water tank comprises a water storage chamber and a heat supply side inlet, a heat supply side outlet, a heat load side inlet and a heat load side outlet which are fluidly connected to the water storage chamber; the heat supply side inlet is fluidly connected to the cold source side outlet and the water heater outlet; the heat supply side outlet is fluidly connected to the cold source side inlet and the water heater inlet; the heat load side outlet is fluidly connected to the water inlet of each of the cultivation floor heating sheets; and the heat load inlet is fluidly connected to the water outlet of each of the cultivation floor heating sheets.
2. The thermal cycle system according to claim 1, characterized in that: It also includes at least one water supply main line fluidically connected to the heat load side outlet and at least one water return main line fluidically connected to the heat load side inlet. The water inlet of each of the cultivated floor heating panels is fluidically connected to the at least one water supply main line, and the water outlet of each of the cultivated floor heating panels is fluidically connected to the at least one water return main line.
3. The thermal cycle system according to claim 2, characterized in that: The cultivation floor heating plate is equipped with a throttle valve to balance the fluid pressure at each cultivation floor heating plate.
4. The thermal cycle system according to claim 1 or 2, characterized in that: It also includes an electric heater adjacent to the heat load side outlet, the water inlet side fluid of the electric heater is connected to the heat load side outlet, and the water outlet side fluid of the electric heater is connected to the water inlet of each of the cultivation floor heating sheets.
5. The thermal cycle system according to claim 4, characterized in that: It also includes a thermometer and a flow meter arranged between the electric heater and the buffer water tank.
6. The thermal cycle system according to claim 4, characterized in that: It also includes a bypass for circulating water to bypass the electric heater, the water inlet side fluid of the bypass is connected to the heat load side outlet, and the water outlet side fluid of the bypass is connected to the water inlet of each of the cultivation floor heating plates.
7. The thermal cycle system according to claim 1, characterized in that: The heat pump unit is a geothermal source heat pump unit and further comprises a heat source side inlet for groundwater to enter and a heat source side outlet for groundwater to flow out.