Solar energy-air source heat pump coordinated cross-seasonal heat storage system and method

Abstract

The invention provides a solar energy-air source heat pump coordinated cross-seasonal heat storage system and method.The solar energy-air source heat pump coordinated cross-seasonal heat storage system comprises a solar heat collection module, an air source heat pump module, a heat storage module, a heat exchange module and a control module, the output end of the solar heat collection module is connected with the heat storage module and the heat exchange module, and the output end of the air source heat pump module is connected with the control module; solar energy is collected and converted into heat energy; the output end of the air source heat pump module is connected with the heat storage module and the heat exchange module, and the air source heat pump module is used for absorbing heat energy from air; the output end of the heat storage module is connected with the heat exchange module; the heat exchange module is used for uniformly transferring heat energy into the greenhouse; uniform temperature control of a large-area space of the greenhouse is achieved, dynamic temperature requirements of different crops in various growth stages are accurately met, the constant temperature technology is remarkably different from a constant temperature technology in the traditional building field, and finally the outstanding effects of saving energy and reducing consumption are achieved while high quality and high yield of the crops are guaranteed.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of temperature control of agricultural facilities, and particularly relates to a solar-air source heat pump collaborative cross-seasonal heat storage system and method. BACKGROUND

[0002] As an important facility for ensuring the counter-seasonal growth of crops and improving the yield and quality of crops, the stable control of the internal temperature environment of an agricultural greenhouse is crucial. At present, the heating of an agricultural greenhouse mainly relies on fossil energy combustion heating or a single clean energy supply mode. The fossil energy supply not only has a high cost, but also produces pollutant emissions, which does not meet the green agricultural development demand. The single solar energy supply mode is significantly affected by natural conditions such as seasons and weather. In seasons with sufficient light, energy surplus is prone to occur, while in winter with insufficient light, it is difficult to meet the heating demand of the greenhouse. The single air source heat pump supply has a large decrease in heating efficiency in low-temperature environments, and it is difficult to stably provide sufficient heat for the greenhouse.

[0003] Although the cross-seasonal heat storage technology can realize the seasonal storage and allocation of energy, the existing cross-seasonal heat storage systems are mainly driven by a single energy source. Therefore, the energy supply and demand relationship in different seasons cannot be effectively balanced, and the adaptability to agricultural greenhouses is poor. It is difficult to flexibly adjust according to the dynamic temperature demand of the growth of crops in the greenhouse, resulting in low energy utilization efficiency and unstable greenhouse temperature control effect, which restricts the sustainable development of agricultural greenhouses. SUMMARY

[0004] The purpose of the present application is to provide a solar-air source heat pump collaborative cross-seasonal heat storage system and method, which solves the problems existing in the prior art.

[0005] In order to achieve the above purpose, the technical scheme adopted by the present application is as follows: In a first aspect, the present application provides a solar-air source heat pump collaborative cross-seasonal heat storage system, which comprises a solar heat collection module, an air source heat pump module, a heat storage module, a heat exchange module and a control module, wherein: The output end of the solar heat collection module is connected with the heat storage module and the heat exchange module respectively, for collecting solar energy and converting it into heat energy; The output end of the air source heat pump module is connected with the heat storage module and the heat exchange module respectively, for absorbing heat energy from the air; The output end of the heat storage module is connected with the heat exchange module; The heat exchange module is used for uniformly transferring heat energy to the inside of the greenhouse; The control module is electrically connected with the solar heat collection module, the air source heat pump module, the heat storage module and the heat exchange module respectively, and is used for presetting temperature thresholds of different growth stages of different crops, monitoring temperatures of different areas in the greenhouse, and controlling operation modes and energy flow directions of the modules.

[0006] Preferably, the heat collection array of the solar heat collection module is arranged on the top of the greenhouse.

[0007] Preferably, the control module comprises a data acquisition unit, and the data acquisition unit comprises temperature sensors distributed in a plurality of different crop planting areas in the greenhouse.

[0008] Preferably, the control module further comprises a heat energy regulation unit, which is used for providing heat energy for the heat exchange module by the solar heat collection module and storing excess heat energy in the heat storage module in the heat surplus season, providing energy for the heat exchange module by the air source heat pump module and the solar heat collection module in the case of insufficient solar energy, providing energy for the heat exchange module by the heat storage module in the heat demand season, and providing energy for the heat exchange module by the solar heat collection module, the air source heat pump module and the heat storage module in the case of insufficient heat storage.

[0009] In a second aspect, the present application provides a solar-air source heat pump collaborative cross-season heat storage method, comprising the following steps: According to the seasonal climate characteristics and the temperature requirements of the growth cycle of crops in the greenhouse, the heat surplus season and the heat demand season are divided, and temperature intervals for different growth stages of different crops are preset; In the heat surplus season, the solar heat collection module is used to provide heat energy for the heat exchange module, and the excess heat energy is stored in the heat storage module; when the solar energy is insufficient, the air source heat pump module and the solar heat collection module are used to provide energy for the heat exchange module; In the heat demand season, the heat storage module is used to provide energy for the heat exchange module; when the heat storage is insufficient, the solar heat collection module, the air source heat pump module and the heat storage module are used to provide energy for the heat exchange module.

[0010] Preferably, in the heat surplus season, the amount of excess heat energy stored in the heat storage module is planned to meet the basic energy supply demand of the subsequent seedling stage of crops.

[0011] Preferably, in the heat demand season, the heat release rate of the heat storage module is dynamically adjusted according to the specific growth stage of the crops, and the heat release rate of the seedling stage is higher than that of the growth period.

[0012] Preferably, the temperature deviation of each area in the greenhouse is controlled within the range allowed by the growth of crops by partition regulation of the heat exchange module, so as to realize uniform temperature control of a large area of space.

[0013] Preferably, the method for partition regulation of the heat exchange module is: If the temperature of a region is higher than the preset upper limit corresponding to the growth stage of the crop, the heat energy supply to the region is reduced; If it is lower than the preset lower limit, the heat energy input to the region is increased, so that the temperature deviation of each region in the greenhouse is controlled within the allowable range for crop growth.

[0014] Preferably, in the heat demand season, when the solar heat collection module and the air source heat pump module are started to supply energy cooperatively, if excess heat energy is generated, it is supplemented to the heat storage module.

[0015] Compared with the prior art, the beneficial effects of the present application are: The solar-air source heat pump collaborative cross-season heat storage system provided by the present application realizes precise allocation of agricultural greenhouse heat in time and space through the cooperative operation of solar heat collection and air source heat pump and cross-season heat storage design, effectively solves the problem of unstable single energy supply; the system matches the heat storage and release strategy of the crop growth cycle, stores the excess solar energy in the heat surplus season and releases it in the demand season, significantly improves the energy utilization efficiency and reduces the dependence on fossil energy; combined with the heat exchange modules uniformly distributed along the crop planting rows and the multi-region temperature monitoring, the temperature of the large area space in the greenhouse is uniformly controlled, the dynamic temperature demand of different crops at each growth stage is accurately met, which is significantly different from the constant temperature technology in the traditional building field, and finally the outstanding effects of energy saving and consumption reduction are achieved while ensuring high quality and high yield of crops. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 The flowchart of the embodiment of the present application is shown. DETAILED DESCRIPTION

[0017] In the following description, specific details are set forth such as particular system configurations, techniques, etc., in order to provide a thorough understanding of the embodiments of the present application. However, it will be apparent to those skilled in the art that the present application can be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present application with unnecessary detail.

[0018] It should be understood that when used in the specification and the appended claims, the term "comprises" indicates the presence of the described features, integers, steps, operations, elements, and / or components, but does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0019] It should also be understood that the term "and / or" as used in the specification and the appended claims means any one or more of the associated listed items, as well as all possible combinations of the items, and includes these combinations.

[0020] As used in the description of the application and the appended claims, the term "if' can be interpreted to mean "when" or "upon" or "in response to determining" or "in response to detecting." Similarly, the phrase "if it is determined" or "if [a described condition or event] is detected" can be interpreted to mean "upon determining" or "in response to determining" or "upon detecting [the described condition or event]" or "in response to detecting [the described condition or event]."

[0021] In addition, the description in the specification of the application and the appended claims, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0022] In the description of the application, the reference "one embodiment" or "some embodiments" means that the specific features, structures or characteristics described in connection with the embodiment are included in one or more embodiments of the application. Therefore, the statements "in one embodiment", "in some embodiments", "in other some embodiments", "in additional some embodiments" and the like appearing in different places in the specification are not necessarily all referring to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized. The terms "include", "contain", "have" and their variants mean "include but not limited to", unless otherwise specifically emphasized.

[0023] Embodiment 1 The embodiment provides a solar-air source heat pump collaborative cross-season heat storage system, which comprises a solar heat collection module, an air source heat pump module, a heat storage module, a heat exchange module and a control module, wherein: The output end of the solar heat collection module is connected with the heat storage module and the heat exchange module respectively, adopts a heat collection array design suitable for the top or peripheral open area of an agricultural greenhouse, is used for collecting solar energy and converting it into heat energy, and can regulate the heat energy delivery direction according to the heat demand of the crop growth stage; The output end of the air source heat pump module is connected with the heat storage module and the heat exchange module respectively, selects a low-temperature adaptive model suitable for the ventilation area outside the greenhouse, is used for absorbing heat energy from the air and converting it into available heat energy, and has a heating power adjustment range matched with the large-area energy supply demand of the greenhouse; The output end of the heat storage module is connected with the heat exchange module, adopts a large-capacity heat storage structure arranged around the greenhouse underground, has a heat release rate adjustment function matched with the heat demand of different growth stages of crops, and is used for storing excess heat energy.

[0024] The control module is electrically connected with each module respectively, can preset temperature threshold of different crops in each growth stage, involves crop types including vegetables, fruits, flowers and the like, growth stages cover sowing, seedling, growth, fruiting, monitors temperature in different areas of the greenhouse, and controls operation mode and energy flow direction of each module.

[0025] Embodiment 2 On the basis of embodiment 1, the solar-air source heat pump collaborative cross-season heat storage system provided in the embodiment uses heat dissipation elements evenly distributed along crop planting rows, including long strip heat dissipation coil pipes and multi-node heat dissipation fins, is suitable for large area space of the greenhouse, and is used for uniformly transmitting heat energy to the greenhouse to adjust temperature.

[0026] The heat collection array of the solar heat collection module covers part of area of the top of the greenhouse, is suitable for span design of the greenhouse, and avoids occupying planting space.

[0027] The air source heat pump module has stable heating efficiency in a low temperature environment, and can meet high energy supply demand of the greenhouse in a low temperature season.

[0028] The capacity of the heat storage module meets basic energy supply demand of crops in a key growth stage for a long time, and the heat release rate can be adjusted according to the growth stage of the crops.

[0029] The heat dissipation elements of the heat exchange module are laid along crop planting rows, have uniform spacing, and the density of the heat dissipation elements can be adjusted according to crop demand in different planting areas, so that the temperature deviation of each area in the greenhouse is controlled within the allowable range of crop growth.

[0030] The control module is connected with temperature sensors in multiple different areas of the greenhouse, and preset temperature thresholds include different intervals in the sowing period, seedling period, growth period and fruiting period of crops.

[0031] Embodiment 3 The solar-air source heat pump collaborative cross-season heat storage method provided in the embodiment includes the following steps. Step 1, according to seasonal climate characteristics and temperature demand of crops in a growth cycle in the greenhouse, dividing heat surplus season and heat demand season, and presetting temperature intervals of corresponding crops in each growth stage; Step 2, in the heat surplus season, preferentially starting the solar heat collection module, after meeting the basic heat demand of the current growth stage of crops in the greenhouse, transmitting the excess heat energy to the heat storage module for storage, and starting the air source heat pump module to supply energy when the solar energy is insufficient; Step 3, in the heat demand season, preferentially using the heat storage module to release heat energy according to the heat release rate required by the current growth stage of crops, and starting the solar heat collection module and the air source heat pump module to supply energy when the heat storage is insufficient; Step 4, real-time monitoring of temperature by temperature sensors distributed in each crop planting area in the greenhouse, if the temperature of a certain area is higher than the preset upper limit of the corresponding crop growth stage, reduce the heat energy delivery of the heat exchange module in this area; if it is lower than the preset lower limit, increase the heat energy input in this area to ensure the stable temperature of each area in the greenhouse.

[0032] Embodiment 4 On the basis of Embodiment 3, the solar-air source heat pump collaborative cross-season heat storage method provided in this embodiment, in step 2, the "basic heating demand" met by the solar heat collection module is the heating demand during the day in the crop growth period, and the excess heat storage amount needs to meet the basic energy supply in the subsequent seedling period for a long time.

[0033] In step 3, the heat release rate of the heat storage module is dynamically adjusted according to the crop growth stage, for example, the heat release rate during the seedling period is higher than that during the growth period.

[0034] In step 4, the temperature deviation in each area in the greenhouse is controlled within the allowable range of crop growth, and the temperature uniformity of large-area space is realized through zonal regulation.

[0035] Embodiment 5 The solar-air source heat pump collaborative cross-season heat storage method provided in this embodiment includes the following steps: Seasonal division and operation mode setting: according to the climate characteristics of different seasons and the temperature demand of crop growth cycle in the greenhouse, for example, the seedling period of most crops needs high energy supply in winter, and the growth period of most crops needs basic energy supply in summer, the operation cycle is divided into heat surplus season and heat demand season. The heat surplus season includes spring and summer, during which the heat demand of the crop growth period is low, and the excess heat can be stored; the heat demand season includes autumn and winter, during which the heat demand of the seedling period or the fruiting period of the crops is high, and the stored heat needs to be released. At the same time, the temperature interval of each growth stage of the corresponding crops is preset, for example, the temperature preset upper limit of the seedling period is higher than that of the growth period, and the growth period needs to maintain the diurnal temperature difference. The building field is the fixed temperature interval throughout the year, and there is no need to consider such differences.

[0036] Heat surplus season operation: In the heat surplus season, i.e. the crop growth period, the control module preferentially starts the solar heat collection module. If the heat collection efficiency of the solar heat collection module meets the current basic heating demand of the greenhouse, for example, the basic heating demand of the crops in the daytime during the growth period, and there is still excess heat, the excess heat is transported to the heat storage module for storage to reserve heat for the subsequent seedling raising period. In the building field, the stored heat is only used for winter fixed heating, and there is no need to associate with the crop growth demand. If the heat collection efficiency of the solar heat collection module cannot meet the basic heating demand of the greenhouse, for example, in rainy days, the control module starts the air source heat pump module to cooperate with the solar heat collection module to supply energy to the greenhouse. After the heating demand of the greenhouse is met, the excess heat is transported to the heat storage module for storage. The heat exchange module maintains a low rate of uniform heat dissipation in this stage to ensure that the temperature difference in the greenhouse meets the demand of the crop growth period. In the building field, it is a constant temperature operation mode without temperature difference, and there is no need to adapt to the crop temperature difference demand.

[0037] Heat demand season operation: In the heat demand season, i.e. the crop seedling raising period or the fruiting period, the control module first monitors the heat storage capacity of the heat storage module. If the heat storage capacity meets the current heating demand of the greenhouse, for example, the high energy supply at night during the seedling raising period, the control module controls the heat storage module to release heat energy at a release rate matched with the demand of the seedling raising period, and the heat energy is uniformly transported to the greenhouse through the heat exchange module to maintain a high and stable temperature in the greenhouse. In the building field, the release rate is fixed and does not need to be adjusted according to the crop stage. If the heat storage capacity is insufficient, the control module starts the solar heat collection module and the air source heat pump module, and the two modules operate cooperatively, for example, solar energy is the main source of energy in the daytime, and the heat pump is auxiliary, and at night, the heat pump is the main source of energy, which collectively supplies energy to the greenhouse. At the same time, according to the current heating demand of the crops in the growth stage, part of the excess heat can be selectively supplemented to the heat storage module. In this stage, the heat exchange module improves the control precision of heat dissipation uniformity to avoid local low temperature affecting the survival rate of seedling raising. In the building field, there is no need for high-precision uniform heat exchange in small spaces, and there is no such design demand.

[0038] Dynamic adjustment: The control module realizes monitoring through temperature sensors distributed in each crop planting area in the greenhouse. The sensor is suitable for large-area space monitoring, and in the building field, there are only a few monitoring points, and there is no need for partition monitoring. The temperature changes in different areas of the greenhouse are monitored in real time. If the temperature in a certain area of the greenhouse is higher than the preset upper limit of the current growth stage of the corresponding crops, the heat energy supply of the heat exchange module in that area is reduced, but the whole supply is not stopped. It is suitable for large-area partition control. In the building field, the whole is controlled, and there is no need for partition operation. If the temperature in a certain area is lower than the preset lower limit, the heat energy input of the heat exchange module in that area is increased, and at the same time, the operating parameters of the solar heat collection module and the air source heat pump module are adjusted according to the growth stage of the crops, for example, the heating power of the heat pump is increased during the seedling raising period to ensure that the temperature in each area of the greenhouse is stable within the suitable range of the current growth stage of the crops.

[0039] The above-described embodiments are only used to illustrate the technical solutions of the present application, but not limit them; although the present application is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application.

Claims

1. A solar-air source heat pump synergistic interseasonal heat storage system, characterized in that, It includes solar thermal collector modules, air source heat pump modules, heat storage modules, heat exchange modules, and control modules, among which: The output end of the solar thermal collector module is connected to the thermal storage module and the heat exchange module respectively, for collecting solar energy and converting it into thermal energy; The output terminal of the air source heat pump module is connected to the heat storage module and the heat exchange module respectively, and is used to absorb heat energy from the air; The output terminal of the heat storage module is connected to the heat exchange module; The heat exchange module is used to evenly transfer heat energy into the greenhouse. The control module is electrically connected to the solar thermal collector module, the air source heat pump module, the heat storage module, and the heat exchange module, respectively. It is used to preset the temperature thresholds for different growth stages of different crops, monitor the temperature in different areas of the greenhouse, and control the operation mode and energy flow direction of each module.

2. The interseasonal heat storage system combining solar energy and air source heat pump according to claim 1, characterized in that, The solar collector array of the solar collector module is arranged on the top of the greenhouse.

3. The interseasonal heat storage system combining solar energy and air source heat pump according to claim 1, characterized in that, The control module includes a data acquisition unit, which includes temperature sensors distributed in multiple different crop planting areas within the greenhouse.

4. The interseasonal heat storage system combining solar energy and air source heat pump according to claim 1, characterized in that, The control module also includes a thermal energy regulation unit, which is used to provide thermal energy to the heat exchange module using the solar thermal collector module during the heat surplus season and store the excess thermal energy in the heat storage module; when solar energy is insufficient, the air source heat pump module and the solar thermal collector module work together to provide energy to the heat exchange module; during the heat demand season, the heat storage module is used to provide energy to the heat exchange module; when heat storage is insufficient, the solar thermal collector module, the air source heat pump module and the heat storage module work together to provide energy to the heat exchange module.

5. A method for cross-seasonal heat storage using a solar-air source heat pump synergy, characterized in that, Includes the following steps: Based on seasonal climate characteristics and temperature requirements of crops growing in greenhouses, the heat surplus season and heat demand season are divided, and temperature ranges are preset for different crops at each growth stage. During periods of heat surplus, solar thermal collectors provide heat energy to the heat exchange modules and store excess heat energy in the heat storage modules. When solar energy is insufficient, air source heat pump modules and solar thermal collectors work together to provide energy to the heat exchange modules. During peak heat demand seasons, the heat storage module provides energy to the heat exchange module; when heat storage is insufficient, the solar collector module, air source heat pump module, and heat storage module work together to provide energy to the heat exchange module.

6. A method for cross-seasonal heat storage using a solar-air source heat pump synergy as described in claim 5, characterized in that, During the heat surplus season, the excess heat energy stored in the heat storage module is planned to be used to meet the basic energy supply needs of subsequent crop seedling stages.

7. A method for cross-seasonal heat storage using a solar-air source heat pump synergy according to claim 5, characterized in that, During the season of high heat demand, the heat release rate of the heat storage module is dynamically adjusted according to the specific growth stage of the crop, with the heat release rate during the seedling stage being higher than that during the growth stage.

8. A method for cross-seasonal heat storage using a solar-air source heat pump synergy as described in claim 5, characterized in that, By controlling the heat exchange module in different zones, the temperature deviation in each area of ​​the greenhouse can be kept within the range allowed for crop growth, thereby achieving uniform temperature control over a large area.

9. A method for cross-seasonal heat storage using a solar-air source heat pump synergy according to claim 5, characterized in that, The method for zone-controlled regulation of the heat exchange module is as follows: If the temperature in a certain area is higher than the preset upper limit for the corresponding crop growth stage, the heat energy transfer in that area will be reduced. If the temperature is below the preset lower limit, the heat input to that area will be increased, thereby controlling the temperature deviation in each area of ​​the greenhouse within the allowable range for crop growth.

10. A method for cross-seasonal heat storage using a solar-air source heat pump synergy according to claim 5, characterized in that, During peak heat demand seasons, when the solar thermal collector module and the air source heat pump module are activated to supply energy in tandem, any excess heat generated is then transferred to the heat storage module.

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