A combined heating system for a desert greenhouse and a heating method thereof

Abstract

The present application relates to a kind of desert greenhouse combined heating system, including heat storage module, for providing heat energy converted by sand-containing heat storage medium to desert greenhouse;Energy supply module, including the first energy supply submodule and the second energy supply submodule capable of independently providing controllable heat source to sand-containing heat storage medium in heat storage module;Controller is communicatively coupled to energy supply module, configured to dynamically adjust the energy supply mode of the first energy supply submodule and the second energy supply submodule to heat storage module based on the correlation of outdoor temperature information and preset energy consumption temperature balance point to maintain the set temperature environment required by plant.The present application also relates to a kind of desert greenhouse heating method for adjusting the energy supply mode of the first energy supply submodule and the second energy supply submodule to heat storage module based on the correlation of outdoor temperature information and preset energy consumption temperature balance point, including independently heating desert greenhouse by heat storage module or jointly heating desert greenhouse by the first energy supply submodule and the second energy supply submodule.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of desert greenhouse heat preservation, and particularly relates to a desert greenhouse combined heating system and a heating method thereof. BACKGROUND

[0002] In a desert environment, temperature stability is crucial for the physiological activities and growth and development of plants. In recent years, the application of desert greenhouses has become increasingly widespread. A desert greenhouse is an innovative agricultural technology that combines the techniques of a greenhouse and a big shed, providing an effective solution for plant cultivation in arid and desertified areas. As a result, a desert greenhouse creates a suitable and controllable growing environment for plants under different seasons and weather conditions.

[0003] The main goal of a desert greenhouse is to create suitable growing conditions for plants by controlling environmental parameters, allowing them to grow in dry and high-temperature environments. However, the desert has a large diurnal temperature difference, and the outdoor temperature gradually decreases at night, affecting the temperature inside the greenhouse, causing the room temperature to deviate from the suitable temperature required for plant growth. Therefore, it is necessary to artificially compensate for the temperature inside the room.

[0004] Most plants grown in ordinary greenhouses are temperate or subtropical plants, which have a relatively short growth cycle, usually between a few weeks and a few months. For example, lettuce or small tomatoes can be harvested within a few weeks, with a small time span. In contrast, plants grown in desert greenhouses are often adapted to arid or desert environments, and these plants generally have a longer growth cycle. Some desert plants, such as agaves, may take several months or even years to mature or reach the stage of harvest, with a large time span. Therefore, compared to plants grown in ordinary greenhouses, plants grown in desert greenhouses will span multiple seasons during their entire growth stage, and their suitable growth temperature will be more susceptible to seasonal environmental temperature fluctuations. In addition, due to the special geographical location and climate conditions of desert areas, there is a lack of regulation by oceans, lakes, or atmospheric circulation, resulting in large temperature fluctuations between seasons, making it more challenging to maintain the suitable growth temperature of plants.

[0005] CN104406253A discloses an air conditioning system for a desert and a method thereof. The air conditioning system includes a heating system, a cooling system, and a control system. The heating system and the cooling system are connected through a shared fan coil, and the control system is connected to the heating system and the cooling system respectively. The heating system includes a first heat exchanger, a first fan, a first three-way valve, a first storage tank unit, and a fan coil. The first heat exchanger, the first fan, the first three-way valve, and the first storage tank unit form a loop through a ventilation duct. One end of the fan coil is connected to the first three-way valve through a second fan, and the other end of the fan coil is connected to the first heat exchanger and the first storage tank unit through a first stop valve respectively.

[0006] For the heat preservation and heating of the greenhouse in the desert area, the existing technology usually uses a heat preservation pool to store heat during the day and use it at night, which is to use sand as a heat storage medium, accumulate solar heat energy during the day through sand, and extract and release heat to the greenhouse at night. However, the heat preservation pool alone is not enough to maintain the temperature of the greenhouse throughout the night, so a device that can supply energy spontaneously is needed to make up for the insufficient heat supply of the heat storage medium. Air source heat pump and traditional electric heating equipment are two common heating devices, among which the air source heat pump is a device that uses air heat energy to convert energy, which converts low-temperature heat energy into high-temperature heat energy for heating through the principle of compression cooling cycle. Compared with traditional electric heating or fuel heating equipment, air source heat pump can provide the same heating effect with lower energy consumption, saving energy and reducing energy cost. However, the performance of air source heat pump is easily affected by environmental temperature, for example, in extremely low temperature environment, its heating efficiency will be lower than that of traditional electric heating equipment. On the contrary, the traditional electric heating equipment is based on the principle of converting electric energy into heat energy, which generates heat through electric heating body to achieve heating, which is usually not affected by environmental temperature. Different heating methods have their own advantages and disadvantages, how to use different heating equipment combination heating to maintain the suitable temperature environment of the desert greenhouse at night is a means to solve the technical problems of insufficient heat preservation efficiency and high energy consumption of the desert greenhouse in the prior art.

[0007] In addition, on the one hand, there are differences in the understanding of those skilled in the art, and on the other hand, a large number of literatures and patents have been studied by the applicant when making the invention, but due to the limitation of space, all details and contents are not listed in detail, which does not mean that the invention does not have these prior art characteristics, on the contrary, the invention has all the characteristics of the prior art, and the applicant reserves the right to add relevant prior art in the background art. SUMMARY

[0008] In view of the deficiencies of the prior art, the present application provides a desert greenhouse combined heating system and a heating method thereof, which aims to solve at least one or more technical problems existing in the prior art.

[0009] To achieve the above-mentioned purpose, the present application provides a desert greenhouse combined heating system, comprising:

[0010] The heat storage module is used to provide heat energy converted by the heat storage medium containing sand to the desert greenhouse;

[0011] The energy supply module comprises a first energy supply sub-module and a second energy supply sub-module capable of independently providing controllable heat source to the heat storage medium containing sand in the heat storage module;

[0012] The controller is communicatively coupled to the energy supply module and is configured to dynamically adjust the energy supply mode of the first energy supply submodule and the second energy supply submodule to the heat storage module based on the correlation between the outdoor temperature information and the preset energy consumption temperature balance point to maintain the set temperature environment provided by the desert greenhouse to the plants.

[0013] The present application is based on the principle that two heat supply units have different heat supply benefits at different outdoor temperatures, obtains the change relationship between the outdoor temperature and the power consumption of the two heat supply units when maintaining the target greenhouse temperature, defines the intersection of the change curves of the outdoor temperature and the power consumption of the two heat supply units as the energy consumption temperature balance point, so that the system can switch the energy supply state of the two heat supply units to the heat storage module according to the correlation between the outdoor temperature and the energy consumption temperature balance point, to reduce the overall energy consumption when supplying heat to the desert greenhouse, reduce energy load, and help save costs. The present application fully considers the characteristics of large diurnal temperature difference of the desert greenhouse, uses the power consumption-temperature curve to determine the energy consumption temperature balance point, avoiding the heating limitations of traditional fixed time point-based heating equipment switching. In addition, the present application adopts a combined heating mode, and a single heat supply unit only works in a set period related to the preset energy consumption temperature balance point, avoiding the situation that the staff is difficult to maintain the all-weather working heat supply unit. Instead, the staff can maintain another heat supply unit when one of the heat supply units is working to maintain the constant temperature inside the greenhouse, reducing the failure rate of the heat supply unit and ensuring the cyclic sustainability of the heating system.

[0014] Preferably, the controller dynamically adjusts the energy supply mode of the first energy supply submodule and the second energy supply submodule to the heat storage module based on the correlation between the outdoor temperature information and the preset energy consumption temperature balance point to maintain the set temperature environment provided by the desert greenhouse to the plants, including:

[0015] If the outdoor temperature is higher than the preset energy consumption temperature balance point, the controller starts the first energy supply submodule to provide a controllable first heat source to the sand-containing heat storage medium in the heat storage module to maintain the set temperature environment;

[0016] If the outdoor temperature is not higher than the preset energy consumption temperature balance point, the controller starts the second energy supply submodule to provide a controllable second heat source to the sand-containing heat storage medium in the heat storage module to maintain the set temperature environment.

[0017] The present application combines the advantages and disadvantages of air source heat pumps and traditional electric heating equipment, reduces the high energy consumption generated by long-term continuous energy supply of a single energy supply device, and especially avoids the frequent fluctuations in heating efficiency of a single energy supply device due to the influence of outdoor temperature changes.

[0018] Preferably, the controller initiating the first energy supply sub-module to provide controllable first heat source to the sand-containing heat storage medium in the heat storage module to maintain the set temperature environment comprises:

[0019] If the stored heat value of the heat storage module is lower than the second threshold value, the controller controls the first energy supply sub-module to provide controllable first heat source to the heat storage module at the first power in a manner that the stored heat value of the heat storage module is not lower than the second threshold value.

[0020] If the stored heat value of the heat storage module is at the second threshold value, the controller controls the first energy supply sub-module to provide controllable first heat source to the heat storage module at the second power in a manner that the heat storage module maintains the stored heat value of the second threshold value.

[0021] The present application stores the daytime heat in the desert area by means of the heat storage module for night use, improves the resource utilization of renewable energy in the desert area, reduces the energy consumption of the desert greenhouse heating by using the stored heat across time, and further improves the operation power of the first heating unit before the preset energy consumption temperature balance point, increases the operation power or time of the first energy supply sub-module, so that the heat storage module can collect as much heat from the first energy supply sub-module as possible as backup heat to compensate for the indoor temperature, reduces the output of the traditional second energy supply sub-module, and achieves the purpose of saving the consumption of limited energy in the desert.

[0022] Preferably, the controller initiating the second energy supply sub-module to provide controllable second heat source to the sand-containing heat storage medium in the heat storage module to maintain the set temperature environment comprises:

[0023] If the stored heat value of the heat storage module is higher than the first threshold value, the controller adjusts the second energy supply sub-module to the standby state until the stored heat value of the heat storage module reaches the first threshold value, and controls the second energy supply sub-module to provide controllable second heat source to the heat storage module at the third power in a manner that the heat storage module maintains the stored heat value of the first threshold value.

[0024] Preferably, the execution of the energy supply mode of the first energy supply sub-module and the second energy supply sub-module is initiated based on the first threshold value related to the stored heat value of the sand-containing heat storage medium in the heat storage module.

[0025] Preferably, the preset energy consumption temperature balance point is determined in association with the desired set temperature threshold value of the desert greenhouse. Based on the change of the indoor target temperature setting value, the change relationship between the outdoor temperature and the power consumption of the two heating units at different target temperatures can be obtained one by one, so that different energy consumption temperature balance points corresponding to the maintenance of the indoor target temperature setting value can be adaptively obtained, so that the system can save energy consumption due to different indoor target temperature setting values caused by different seasons, different plants and different growth stages.

[0026] Preferably, the first energy supply sub-module is an air source heat pump, and the second energy supply sub-module is an electric heating device.

[0027] Preferably, the application further provides a heating method based on the combined heating system of the desert greenhouse, which comprises:

[0028] providing heat energy to the desert greenhouse through the heat storage module configured with the heat storage medium containing sand;

[0029] providing the first energy supply sub-module and the second energy supply sub-module capable of independently providing controllable heat sources to the heat storage medium in the heat storage module;

[0030] dynamically adjusting the energy supply modes of the first energy supply sub-module and the second energy supply sub-module to the heat storage module based on the correlation between the outdoor temperature information and the preset energy consumption temperature balance point to maintain the set temperature environment provided by the desert greenhouse to the plants.

[0031] Preferably, the dynamic adjustment of the energy supply modes of the first energy supply sub-module and the second energy supply sub-module to the heat storage module based on the correlation between the outdoor temperature information and the preset energy consumption temperature balance point to maintain the set temperature environment provided by the desert greenhouse to the plants comprises:

[0032] if the outdoor temperature is higher than the preset energy consumption temperature balance point, starting the first energy supply sub-module to provide controllable first heat sources to the heat storage medium containing sand in the heat storage module to maintain the set temperature environment;

[0033] if the outdoor temperature is not higher than the preset energy consumption temperature balance point, starting the second energy supply sub-module to provide controllable second heat sources to the heat storage medium containing sand in the heat storage module to maintain the set temperature environment.

[0034] Preferably, the application provides a heating method based on the combined heating system of the desert greenhouse, which further comprises: taking the first threshold value related to the storage heat value of the heat storage medium containing sand in the heat storage module as a triggering event to perform the heat source supply of the first energy supply sub-module and the second energy supply sub-module to the heat storage module. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 is a structural principle diagram of a combined heating system of a preferred embodiment provided by the application;

[0036] Figure 2 is a variation curve of the heating efficiency of the first energy supply sub-module and the second energy supply sub-module related to the outdoor temperature of a preferred embodiment provided by the application;

[0037] Figure 3 is a structural schematic diagram of a heat storage module of a preferred embodiment provided by the application;

[0038] Figure 4 is a schematic diagram of the heat change of the heat storage medium in the heat storage module of a preferred embodiment provided by the present application;

[0039] Figure 5 is a schematic diagram of the arrangement of a plurality of heat storage modules outside the desert greenhouse of a preferred embodiment provided by the present application.

[0040] List of reference signs

[0041] 100: heat storage module; 101: heat preservation shell; 102: upper shell; 103: lower shell; 104: heat storage cavity; 105: heat storage medium; 106: heat exchange medium inlet; 107: heat exchange coil; 108: heat exchange medium outlet; 109: temperature measurement unit; 110: heat preservation layer; 111: feed inlet; 200: temperature detection module; 300: controller; 400: energy supply module; 410: first energy supply submodule; 420: second energy supply submodule; 500: energy consumption detection module. DETAILED DESCRIPTION

[0042] The preferred embodiments of the present application will be described in detail below with reference to the accompanying drawings, so that the advantages and features of the present application can be more easily understood by those skilled in the art, and the scope of protection of the present application can be more clearly defined. Although the exemplary embodiments of the present application are shown in the drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments described herein.

[0043] Figure 1 a desert greenhouse combined heating system provided by a preferred embodiment of the present application is shown, which can include:

[0044] a heat storage module 100 for providing heat energy converted by a sand-containing heat storage medium 105 to a desert greenhouse;

[0045] an energy supply module 400 including a first energy supply submodule 410 and a second energy supply submodule 420 that can independently provide a controllable heat source to the sand-containing heat storage medium 105 in the heat storage module 100;

[0046] a controller 300 communicatively coupled to the energy supply module 400 and configured to dynamically adjust the energy supply mode of the first energy supply submodule 410 and the second energy supply submodule 420 to the heat storage module 100 based on the correlation between the outdoor temperature information and the preset energy consumption temperature balance point to maintain the set temperature environment provided by the desert greenhouse to the plants.

[0047] According to a preferred embodiment, the controller 300 is configured to provide the functions of start-stop and switching control of the thermal storage module 100, the energy supply module 400 and other greenhouse equipment. Specifically, the controller 300 can include one or more of a microprocessor, a central processing unit, a microcontroller, a digital signal processor or any one of the similar devices or a combination thereof.

[0048] Figure 3 A structural schematic diagram of the thermal storage module 100 according to a preferred embodiment of the present application is shown. Specifically, the thermal storage module 100 according to the present application can include an insulation housing 101. The insulation housing 101 includes an upper housing 102 and a lower housing 103 which can be inserted and combined. Specifically, the upper housing 102 can be configured as a frame structure with an open lower portion, and the lower housing 103 can be configured as a frame structure with an open upper portion opposite to the open lower portion of the upper housing 102. The upper housing 102 and the lower housing 103 can be butted against each other to form a thermal storage cavity 104 for accommodating the thermal storage medium 105.

[0049] According to a preferred embodiment, the insulation housing 101 has a thermal storage cavity 104 for accommodating the thermal storage medium 105, and a feeding port 111 is provided at the top of the thermal storage cavity 104 for adding the thermal storage medium 105. In the present application, the thermal storage medium 105 arranged in the thermal storage module 100 is sand, which is the most economical and environmentally friendly heat storage material in desert areas. In addition, in the present application, the lateral side wall of the lower housing 103 is configured with a shorter or lower baffle, which can be used to combine with the upper housing 102 to form the thermal storage cavity 104. Further, when the upper housing 102 is removed from above the lower housing 103, the thermal storage sand accumulated in the thermal storage cavity 104 can overflow from both sides of the lower housing 103, so as to facilitate the staff to clean and maintain the thermal storage sand tank (i.e. the insulation housing 101).

[0050] According to a preferred embodiment, as shown in Figure 3 The thermal storage cavity 104 of the insulation housing 101 can be arranged with a heat exchange coil 107 allowing the heat exchange medium to flow into the thermal storage cavity 104 to exchange heat with the thermal storage medium 105. As a non-limiting example, when the stored heat is extracted and released by the thermal storage module 100, the heat exchange medium is introduced into the heat exchange coil 107 from the heat exchange medium inlet 106. Since the heat exchange coil 107 is directly placed in the thermal storage cavity 104 and in contact with the thermal storage medium 105, the heat exchange medium exchanges heat with the thermal storage medium 105 to extract heat from the thermal storage medium 105. Further, the heat exchanged heat exchange medium is discharged from the heat exchange medium outlet 108. Specifically, the heat exchange coil 107 can be configured in a spiral form to increase the contact area with the thermal storage medium 105 in the thermal storage cavity 104, which is beneficial to improve the heat exchange efficiency. In the present application, the heat exchange medium arranged in the thermal storage module 100 can be water or oil.

[0051] According to a preferred embodiment, in the present application, the heating and charging of the heat storage medium 105 in the heat storage cavity 104 can come from a solar heat collection system (not shown in the figure). Specifically, a solar heat collector (such as a solar heat collection tube, a solar heat collection plate, etc.) for collecting solar energy can be arranged on the top of the greenhouse, and one or more heat preservation shells 101 containing heat storage sand can be buried in the sand layer or preferably arranged along the circumference of the greenhouse on the inside or outside of the greenhouse. The heat storage sand can be heated by the solar heat collector to transfer the collected solar energy to the heat storage medium 105 in the heat storage cavity 104. Further, the heated heat storage medium 105 is introduced into the heat exchange coil 107 to exchange heat with the heat storage medium 105 in the heat storage cavity 104, so as to store the energy collected by the solar heat collector in the heat storage medium 105 in the heat storage sand tank (i.e. the heat preservation shell 101). When the heat storage module 100 is applied to a desert greenhouse, it is more economical and environmentally friendly to convert and store solar energy into heat energy for use in the desert greenhouse. Therefore, the present application preferably uses a solar heat collector (such as a solar heat collection tube, a solar heat collection plate, etc.) to heat and charge the heat storage sand in the heat storage cavity 104. In addition, in winter or during periods of insufficient sunlight, if solar energy is insufficient to maintain indoor equipment power supply, a backup diesel generator can be used.

[0052] It should be understood that the heat storage medium 105 can also be heated by other means, for example, an electric heating unit in thermal contact with the heat storage medium 105 can be used to heat the heat storage medium 105, so the above content should not be regarded as a specific limitation of the present application. Preferably, the electric heating unit can be inserted into the heat storage medium 105 in the heat storage cavity 104, so as to heat the heat storage sand by direct thermal contact. Alternatively, the electric heating unit can be an electric heating wire.

[0053] According to a preferred embodiment, a temperature sensor (not shown in the figure) can be arranged at the heat exchange medium outlet 108 to measure the discharge temperature of the heat exchanged heat exchange medium flowing out of the heat exchange coil 107, and in combination with the initial temperature of the heat exchange medium before entering the heat exchange coil 107, the heat extracted from the heat storage medium 105 in the heat storage cavity 104 by the heat exchange medium can be calculated.

[0054] According to a preferred embodiment, as shown in Figure 3 The heat preservation shell 101 is provided with a temperature measuring unit 109 which is partially inserted into the heat storage cavity 104. The measuring end of the temperature measuring unit 109 is inserted into the heat storage medium 105 in the heat storage cavity 104. When the temperature measurement result of the temperature measuring unit 109 reaches a set value, the heating and charging of the heat storage medium 105 is completed. Specifically, the temperature measuring unit 109 can be a temperature measuring thermocouple.

[0055] According to a preferred embodiment, as shown in Figure 3As shown, a thermal insulation layer 110 can be arranged on the outer wall of the thermal insulation shell 101, or the upper shell 102 and / or the lower shell 103, and the inner space of the thermal insulation shell 101 can be used as a heat storage cavity 104. Specifically, the thermal insulation layer 110 can be formed of aerogel material to prevent heat loss in the heat storage cavity 104.

[0056] According to a preferred embodiment, the equipment shell (thermal insulation shell 101) of the heat storage module 100, i.e. the upper shell 102 and the lower shell 103, can be made of wood or plastic structure. Alternatively, in the present application, the feed inlet 111 above the heat storage module 100 can be made of wood structure. Since the position of the feed inlet 111 is prone to be corroded by dry sand or wet sand, the wood feed inlet 111 is more convenient to disassemble and replace. In addition, in the Gobi desert area, wood is more easily obtained than steel, which can reduce the transportation of steel.

[0057] According to a preferred embodiment, in the present application, the first energy supply sub-module 410 can be an air source heat pump. The second energy supply sub-module 420 can be an electric heating device. Specifically, the first energy supply sub-module 410 and the second energy supply sub-module 420 can independently provide heat sources to the heat storage module 100 by providing heat exchange medium to the heat storage cavity 104 of the heat storage module 100. Specifically, the first energy supply sub-module 410 and / or the second energy supply sub-module 420 can introduce the heat converted heat exchange medium (such as water or air) into the heat storage cavity 104 of the heat storage module 100, thereby allowing the heat exchange medium from the first energy supply sub-module 410 and / or the second energy supply sub-module 420 to transfer heat to the heat storage medium 105 in the heat storage cavity 104 to supplement the stored heat of the heat storage module 100. Therefore, it can be understood that, Figure 3 As shown, the heat storage cavity 104 can be further configured with at least another heat exchange coil 107 for receiving the heat exchange medium from the first energy supply sub-module 410 and / or the second energy supply sub-module 420, and the heat exchange medium in the heat exchange coil 107 can exchange heat with the heat storage medium 105 in the heat storage cavity 104, so that Figure 3 The heat storage module 100 with the above structure should not be regarded as a specific limitation of the present application.

[0058] According to a preferred embodiment, the first energy supply sub-module 410, i.e. the air source heat pump, utilizes the air thermal energy in the environment as a low-temperature heat source to heat air or water medium, and through a circulating system, extracts and / or transfers heat to the indoor environment, thereby providing a heating effect. In particular, when the temperature difference between the required indoor temperature and the outdoor environment temperature increases, in order to make the indoor temperature reach the set value of adaptation, the air source heat pump needs to consume more energy to offset this temperature difference. In other words, the heating efficiency (or energy efficiency ratio EER) of the air source heat pump will gradually decrease as the outdoor temperature continues to drop. On the contrary, the second energy supply sub-module 420, i.e. the traditional electric heating device, uses electric energy to generate heat, and the heating process and heating efficiency are generally not affected by the outdoor temperature or the indoor-outdoor temperature difference. Generally speaking, when the indoor and outdoor temperatures are similar or the temperature difference between the two is small, if the same heating capacity is required, the air source heat pump consumes less energy than the electric heating device, which is more energy-saving; when the indoor and outdoor temperature difference is too large or the outdoor temperature is lower than the appropriate standard threshold, if the same heating capacity is required, the air source heat pump consumes more energy than the electric heating device, and the energy-saving effect becomes worse.

[0059] As a non-limiting example, Figure 2 The comparison curves of the heating efficiency of the air source heat pump and the electric heating device are shown to maintain the same set indoor temperature. In particular, as the outdoor temperature continues to change, such as the decrease and recovery of the outdoor temperature at night, in order to maintain the indoor temperature of the greenhouse at the set threshold value suitable for crop growth and survival, it is necessary to continuously optimize and adjust the output of the first energy supply sub-module 410 and the second energy supply sub-module 420 to adapt to the change of indoor heat supply caused by the change of indoor-outdoor temperature difference.

[0060] Specifically, referring to Figure 2 In order to maintain the set indoor temperature, when the outdoor temperature is high, the indoor-outdoor temperature difference is small, and the first energy supply sub-module 410 (i.e. the air source heat pump) has more available heat sources, and its power consumption is lower than that of the second energy supply sub-module 420 (i.e. the electric heating device), which has a higher energy consumption ratio (EER). When the outdoor temperature drops, resulting in an increase in the indoor-outdoor temperature difference, the output of the first energy supply sub-module 410 and the second energy supply sub-module 420 increases to maintain the room temperature constant, resulting in an increase in the power consumption of the first energy supply sub-module 410 and the second energy supply sub-module 420.

[0061] On the other hand, in the process of continuously decreasing outdoor temperature, the available heat source of the first energy supply sub-module 410 (i.e. air source heat pump) decreases, and its heating efficiency is affected, so as to maintain the constant set temperature threshold, the power consumption of the first energy supply sub-module 410 (i.e. air source heat pump) gradually increases and is higher than that of the second energy supply sub-module 420 (i.e. electric heating device), resulting in a decrease in energy consumption ratio (EER). In the process of fluctuation of the heating efficiency of the first energy supply sub-module 410 (i.e. air source heat pump) and the second energy supply sub-module 420 (i.e. electric heating device) with outdoor temperature or indoor-outdoor temperature difference, there is an energy consumption temperature balance point between the heating efficiencies of the two, i.e. the preset energy consumption temperature balance point of the present application. The preset energy consumption temperature balance point can be understood as follows: at the energy consumption temperature balance point, the energy consumptions of the first energy supply sub-module 410 (i.e. air source heat pump) and the second energy supply sub-module 420 (i.e. electric heating device) are almost the same.

[0062] In particular, the preset energy consumption temperature balance point can be obtained as follows: in the case of only operating the first energy supply sub-module 410 (i.e. air source heat pump) or only operating the second energy supply sub-module 420 (i.e. electric heating device), the outdoor temperature value and the heating unit power consumption corresponding to the outdoor temperature value are counted. The power consumption can be known by the energy consumption detection module 500 (such as an electric meter) connected to the device, and the indoor-outdoor temperature can be obtained by the temperature detection module 200 (such as a temperature sensor). By summarizing, the power consumption-outdoor temperature curves of the first energy supply sub-module 410 and the second energy supply sub-module 420 can be obtained respectively. The intersection of the two curves means that at this outdoor temperature, the first energy supply sub-module 410 (i.e. air source heat pump) and the second energy supply sub-module 420 (i.e. electric heating device) have the same power consumption in order to maintain the same set temperature of the greenhouse, and then the temperature can be taken as the preset energy consumption temperature balance point.

[0063] According to a preferred embodiment, in the present application, the energy supply mode of the first energy supply sub-module 410 and the second energy supply sub-module 420 to the heat storage module 100 is determined and adjusted by the controller 300 based on the correlation between the outdoor temperature information and the preset energy consumption temperature balance point. Specifically, when additional heat needs to be supplied to the interior of the greenhouse to maintain the set room temperature, in response to the acquisition of outdoor temperature information, when the outdoor temperature is before or higher than the preset energy consumption temperature balance point, the controller 300 starts the first energy supply sub-module 410 to provide the first heat supply to the heat storage module 100 performing heat energy output. When the outdoor temperature is after or lower than the preset energy consumption temperature balance point, the controller 300 switches the first energy supply sub-module 410 to the second energy supply sub-module 420 to provide the second heat supply to the heat storage module 100 performing heat energy output through the second energy supply sub-module 420.

[0064] According to a preferred embodiment, the heat storage module 100 can perform heat energy output in a manner that the heat exchange medium in the heat exchange coil 107 absorbs the heat accumulated by the heat storage medium 105 in the heat storage cavity 104, as described above. Further, the first energy supply sub-module 410 and / or the second energy supply sub-module 420 can supply heat to the heat storage module 100 in a manner that the heated converted heat exchange medium is introduced into the heat storage cavity 104 through the heat exchange coil 107, for example, and the heat generated by the first energy supply sub-module 410 and / or the second energy supply sub-module 420 is stored in the heat storage module 100 through heat exchange between the heat exchange medium and the heat storage medium 105.

[0065] Although the target temperature to be maintained in the greenhouse is almost constant during the night period, the power consumption of both heating devices increases as the indoor-outdoor temperature difference increases, because as the indoor-outdoor temperature difference increases, the indoor heat loss accelerates and it is difficult to maintain, so the heating device needs to increase its output consumption to make up for this part of heat loss. During the process of continuous decrease of outdoor temperature, the power consumption of the air source heat pump increases and gradually rises higher than that of the electric heating device, because the air source heat pump not only needs to provide more heat to make up for the loss of indoor heat, but also needs to increase the difficulty of absorbing heat from the outside environment due to the decrease of outdoor temperature, eventually resulting in that the change trend of power consumption of the air source heat pump is greater than that of the traditional electric heating device as the outdoor temperature decreases. Electric energy is a very precious resource in the desert, therefore, the air source heat pump is started before the outdoor temperature reaches the preset energy consumption temperature balance point, and the electric heating device is started after the outdoor temperature reaches the preset energy consumption temperature balance point, so as to comprehensively consider the advantages and disadvantages of the heating efficiency of the two heating devices, reduce the high energy consumption generated by long-term heating of a single heating device, and avoid the frequent fluctuation of the heating efficiency of a single heating device due to the influence of outdoor temperature change.

[0066] Further, in the present application, the temperature adjustment and maintenance in the greenhouse is mainly realized by heat exchange between the heat storage module 100 and the indoor heat, and the direct heating mode of the heating unit (i.e. the first energy supply sub-module 410 and / or the second energy supply sub-module 420) to the greenhouse is not used, because: the heating process of the heat storage module 100 is less affected by outdoor temperature, compared with the heating unit, especially the first energy supply sub-module 410, the output power of which fluctuates due to outdoor temperature fluctuation, thereby affecting the heating efficiency; secondly, the heat storage module 100 itself as a heat storage pool can use the daytime stored energy (such as solar energy) to heat the indoor, which can improve the resource conversion utilization rate in the desert area and reduce the consumption and waste of continuous energy supply of a single heating unit.

[0067] Specifically, the output power of the air source heat pump unit under the condition of 0℃ is about 70% of the rated condition; under the condition of -6℃, it is about 62%; and under the condition of -10℃, it is about 55%. Generally, the average temperature of the desert during the day is close to 40℃, and the temperature of the desert at night drops a lot, especially in winter, the temperature of the desert at night can reach zero or even lower. Such temperature changes will cause the output power of the air source heat pump unit to fluctuate sharply. The heat storage module 100 not only can store the heat in the external environment, but also can store the heat provided by the heat supply unit, especially the heat produced by the first energy supply sub-module 410 which has higher heat supply efficiency but is easily affected by the external temperature changes. The heat storage module 100 can fully utilize the heat, prolong the actual heat supply time of the first energy supply sub-module 410, and save energy consumption.

[0068] According to a preferred embodiment, considering the day and night temperature difference changes in summer and winter in the desert, in the present application, different specific heat capacities of the heat storage medium 105 (specifically sand) can be stored in the heat storage cavity 104 for summer and winter. Specifically, in summer, the heat storage medium 105 with a first specific heat capacity can be stored in the heat storage cavity 104; in winter, the heat storage medium 105 with a second specific heat capacity can be stored in the heat storage cavity 104; wherein the second specific heat capacity is preferably greater than the first specific heat capacity. Specifically, in summer, dry sand with a specific heat capacity of 1.1X10 3 J / (kg·℃) can be stored in the heat storage cavity 104, while in winter, wet sand with a specific heat capacity of 1.5X10 3 J / (kg·℃) can be stored in the heat storage cavity 104. Because the outdoor low-temperature heat source available for air source heat pumps is limited in winter due to the low temperature of the desert environment, the wet sand with a large specific heat capacity stored in the heat storage cavity 104 can improve the heat storage capacity of the desert greenhouse system and prolong the temperature maintenance time of the crops provided by the desert greenhouse in winter under low temperature environment. According to a preferred embodiment, in the present application, the execution of the energy supply mode of the heat storage module 100 by the first energy supply sub-module 410 and the second energy supply sub-module 420 is triggered by the heat threshold value related to the heat storage module 100. That is, before the first energy supply sub-module 410 and the second energy supply sub-module 420 supply energy to the heat storage module 100, the heat supply regulation for the temperature inside the greenhouse can be completed by the surplus heat accumulated by the heat storage medium 105 containing sand in the heat storage module 100.

[0069] In particular, the controller 300 can switch the start and stop of the energy supply mode of the first energy supply sub-module 410 and the second energy supply sub-module 420, and control the joint energy supply of the heat supply unit (the first energy supply sub-module 410 and the second energy supply sub-module 420) and the heat storage module 100 in the following way:

[0070] S1: When the temperature in the greenhouse drops to a level requiring additional heat, the heat storage module 100 is started to extract the heat stored in the heat storage medium 105 by heat exchange between the heat storage medium 105 and the heat exchange medium in the heat exchange coil 107, and to provide the heat to the greenhouse.

[0071] S2: When the heat or temperature stored in the heat storage module 100 drops to a first threshold value, the controller 300 starts the first energy supply sub-module 410, wherein the output power of the first energy supply sub-module 410 is a first power.

[0072] S3: The heat supplied by the first energy supply sub-module 410 at the first power to the heat storage module 100 is greater than the heat output by the heat storage module 100 to the greenhouse, so that the heat or temperature stored in the heat storage medium 105 in the heat storage module 100 gradually increases and reaches a second threshold value. In other words, the first energy supply sub-module 410 provides a heat source to the heat storage module 100 at the first power in such a way that the stored heat value of the heat storage module 100 is not lower than the second threshold value.

[0073] S4: When the heat or temperature stored in the heat storage module 100 increases to the second threshold value, the first working stage (i.e. the first power mode) of the first energy supply sub-module 410 ends, and the controller 300 adjusts the output power of the first energy supply sub-module 410 to a second power lower than the first power, so that the heat supplied by the first energy supply sub-module 410 at the second power to the heat storage module 100 is substantially balanced with the heat released by the heat storage module 100 to the greenhouse (including the self-emitted heat of the heat storage module 100 and the heat loss during heat transfer), so that the heat or temperature stored in the heat storage module 100 is maintained at the second threshold value. In other words, the first energy supply sub-module 410 provides a heat source to the heat storage module 100 at the second power in such a way that the stored heat value of the heat storage module 100 is maintained at the second threshold value.

[0074] S5: When the outdoor temperature drops to a preset energy consumption temperature balance point, the controller 300 closes the first energy supply sub-module 410, and starts the second energy supply sub-module 420 or adjusts the second energy supply sub-module 420 to an active standby state, instead of directly providing heat supply to the heat storage module 100. At this time, the heat supply in the greenhouse returns to the situation of step S1, i.e. the heat is provided by the heat storage medium 105 in the heat storage module 100.

[0075] S6: When the heat or temperature accumulated in the heat storage module 100 falls from the second threshold value to the first threshold value, the second energy supply sub-module 420 supplies heat to the heat storage module 100 at a third power, which can be configured to maintain the heat generated or supplied by the second energy supply sub-module 420 to the heat storage module 100 and the heat released by the heat storage module 100 to the greenhouse (including the self-emitted heat of the heat storage module 100 and the heat loss during heat transfer) in a substantially balanced state, i.e., the heat supplied by the second energy supply sub-module 420 is substantially equal to the heat required by the greenhouse. In other words, when the storage heat value of the heat storage module 100 falls to the first threshold value, the second energy supply sub-module 420 is switched from the active standby state to the energy supply state to maintain the storage heat value of the heat storage module 100 at the first threshold value.

[0076] S7: When the outdoor temperature rises to the preset energy consumption temperature balance point, the controller 300 turns off the second energy supply sub-module 420 and switches to supplying heat by the first energy supply sub-module 410, and maintains the output power of the first energy supply sub-module 410 at the second power as described above, i.e., in the state of ensuring the heating of the greenhouse, the heat input and output of the heat storage module 100 are kept in balance.

[0077] S8: When the outdoor temperature rises to the point where no additional heat source is needed, the controller 300 turns off the first energy supply sub-module 410, and the heat storage module 100 can continue to supplement the heat, so that the heat value accumulated in the heat storage module 100 rises.

[0078] According to a preferred embodiment, in the present application, the heat storage module 100 corresponds to a heat storage pool. The first energy supply sub-module 410 and the second energy supply sub-module 420 serve as heat supply devices, which are mainly used to supplement the heat stored in the heat storage module 100. Specifically, during the early heating of the greenhouse, the heat stored in the heat storage module 100 is used to supply energy first, and when the storage heat value or temperature of the heat storage module 100 falls to the first threshold value, the first energy supply sub-module 410 is activated and supplies heat to the heat storage module 100 at a higher first power, so that the heat storage module 100 can accumulate surplus heat as a backup while continuously outputting heat.

[0079] Further, when the storage heat value or temperature of the heat storage module 100 reaches the second threshold value, the output power of the first energy supply sub-module 410 is adjusted to the second power, so that the heat storage module 100 maintains the storage heat value at the second threshold value while releasing heat. When the outdoor temperature drops to the preset energy consumption temperature balance point, the second energy supply sub-module 420 can be switched to standby. At this time, the heat accumulated in the heat storage module 100 can be used for heating first, and when the heat drops to the first threshold value, the second energy supply sub-module 420 is kept at a power that can make the heat output by the second energy supply sub-module 420 substantially equal to the heat released by the heat storage module 100 to the indoor environment. In this way, the heat stored in the heat storage module 100 can be fully utilized. In addition, the first energy supply sub-module 410 can be used as much as possible before the preset energy consumption temperature balance point to save overall energy consumption.

[0080] Specifically, in the present application, at least two threshold values are set for the heat storage amount of the heat storage module 100, wherein the first threshold value can represent the minimum storage heat value of the heat storage module 100 that can supply heat to the greenhouse. That is, if the heat value (or temperature value) of the heat storage module 100 is lower than the first threshold value, the effect of supplying heat to the greenhouse cannot make the indoor temperature of the greenhouse reach the set threshold value or is difficult to maintain the set temperature threshold value. The second threshold value can represent the maximum storage heat value of the heat storage module 100.

[0081] It should be understood that the first threshold value and the second threshold value related to the heat storage module 100 should be determined according to the heat storage capacity of the heat storage module 100, such as the specific type of the heat storage medium 105 and the heat supply demand for the heat storage module 100 in different use scenarios. Further, the first threshold value and the second threshold value related to the heat storage module 100 are also related to the expected set temperature threshold value. Specifically, the second threshold value is an attribute of the heat storage module 100 itself, which determines the upper limit of the heat storage value of the heat storage module 100. Different heat storage modules 100 can have different upper limits of the heat storage value, such as using different heat storage medium 105. The first threshold value is not only related to the attribute of the heat storage module 100 itself, but also related to the temperature value required by the greenhouse. Since the heat storage module 100 maintains the required temperature of the greenhouse through heat exchange, the heat or temperature corresponding to the first threshold value is usually higher than the required temperature value of the greenhouse, with a certain temperature difference, to ensure that the heat storage module 100 supplies heat to the greenhouse under the driving of the temperature difference. The change of the required temperature value of the greenhouse will affect the first threshold value of the heat storage module 100, such as when the required temperature value of the greenhouse increases, the first threshold value increases; on the contrary, the first threshold value can be appropriately reduced.

[0082] According to a preferred embodiment, in summer or daytime when the temperature is too high, if the desert greenhouse has a cooling demand, the first energy supply sub-module 410 can be used to absorb the excess heat and discharge it to the outside. As a preferred embodiment, the first energy supply sub-module 410 can be used to store the absorbed excess heat in the heat storage medium 105 (i.e. the heat storage sand) in the heat storage cavity 104 of the heat storage module 100 for later use. In winter or other periods when the temperature is low, if the desert greenhouse has a heating demand, the heat stored in the heat storage module 100 can be released to the greenhouse, or the first energy supply sub-module 410 or the second energy supply sub-module 420 can be used to convert the low-temperature heat source outside into heat and provide it to the greenhouse through the heat storage module 100.

[0083] Figure 4 The heat change of the heat storage medium 105 in the heat storage module 100 is shown in the following figure, which is combined with the above-mentioned heat storage module 100 and the energy supply switching relationship between the heat storage module 100 and the heat supply unit (the first energy supply sub-module 410 and the second energy supply sub-module 420). Figure 4 The above-mentioned heat storage module 100 and the energy supply switching relationship between the heat storage module 100 and the heat supply unit (the first energy supply sub-module 410 and the second energy supply sub-module 420) are described.

[0084] Specifically, in the o-b phase shown in the following figure, the greenhouse does not need additional heating, and the heat storage module 100 can store heat (such as solar heat) to the second threshold value and maintain a saturated state (i.e. maintain the heat or temperature of the second threshold value), and the first energy supply sub-module 410 and the second energy supply sub-module 420 are in a non-working state. Figure 4 In the b-c phase shown in the following figure, the greenhouse needs to provide additional heat supply, and the heat storage module 100 continuously supplies the stored heat to the greenhouse until the stored heat decreases to the first threshold value, and the first energy supply sub-module 410 and the second energy supply sub-module 420 are still in a non-working state.

[0085] Figure 4 In the c-d phase shown in the following figure, because the heat storage value of the heat storage module 100 decreases to the first threshold value, and the outdoor temperature is higher than the preset energy consumption temperature balance point, the first energy supply sub-module 410 is started to supply heat to the heat storage module 100 at the first power, so that the heat storage value of the heat storage module 100 increases to the second threshold value.

[0086] In the d-e phase shown in the following figure, after the heat storage value of the heat storage module 100 increases to the second threshold value, the first energy supply sub-module 410 is adjusted to supply heat to the heat storage module 100 at the second power, so that the heat storage value of the heat storage module 100 is maintained at the second threshold value. Figure 4 In the e-f phase shown in the following figure, when the heat storage value of the heat storage module 100 decreases to the first threshold value, the second energy supply sub-module 420 is started to supply heat to the heat storage module 100 at the third power, so that the heat storage value of the heat storage module 100 increases to the second threshold value.

[0087] Figure 4 In the f-g phase shown in the following figure, after the heat storage value of the heat storage module 100 increases to the second threshold value, the second energy supply sub-module 420 is adjusted to supply heat to the heat storage module 100 at the fourth power, so that the heat storage value of the heat storage module 100 is maintained at the second threshold value.

[0088] In the g-h phase shown in the following figure, when the heat storage value of the heat storage module 100 decreases to the first threshold value, the first energy supply sub-module 410 is started to supply heat to the heat storage module 100 at the first power, so that the heat storage value of the heat storage module 100 increases to the second threshold value. Figure 4 ​​In the ef stage shown, the heat stored in the previous stage of the heat storage module 100 is used to heat the greenhouse until its stored heat value drops back to the first threshold. Since the outdoor temperature is lower than the preset energy consumption temperature balance point, the first energy supply submodule 410 is turned off and the second energy supply submodule 420 is adjusted to the active standby state.

[0089] In such Figure 4 In the fg stage shown, the output power of the second energy supply submodule 420 is adjusted in a way that keeps the heat supplied by the second energy supply submodule 420 to the heat storage module 100 basically balanced with the heat released by the heat storage module 100 to the greenhouse (including the heat dissipated by the heat storage module 100 and heat transfer losses).

[0090] In such Figure 4 During the GO phase, when the outdoor temperature rises to or above the preset energy consumption temperature balance point, the second energy supply submodule 420 is turned off, and the heat supply is switched to the first energy supply submodule 410. The output power of the first energy supply submodule 410 is adjusted in such a way that the heat supplied by the first energy supply submodule 410 to the heat storage module 100 is basically equal to the heat released by the heat storage module 100 to the greenhouse, such as maintaining the second power mentioned above.

[0091] Due to the large diurnal temperature range in desert regions, heat is lost rapidly at night, causing the indoor-outdoor temperature difference to increase over time until it reaches its lowest point around midnight or before dawn, making it difficult to maintain a suitable temperature inside the greenhouse at all times. To adapt to this temperature variation and ensure the growth and survival of greenhouse crops at night, this invention uses a preset energy consumption temperature balance point related to the heating unit's energy consumption as a boundary. During periods of temperature fluctuation at night, an air-source heat pump can be operated to supplement heat to the greenhouse to maintain the preset temperature before the preset energy consumption temperature balance point. However, when the temperature continues to drop below the preset energy consumption temperature balance point, causing the heating efficiency of the air-source heat pump to gradually decrease to below that of traditional electric heating equipment, the controller 300 generates a command to switch the operating states of the two heating devices. Specifically, the air-source heat pump is stopped, and traditional electric heating equipment is used instead to maintain the preset temperature, thereby achieving energy savings.

[0092] like Figure 5As shown, in the present application, a plurality of heat storage modules 100 (or heat storage shells 101 for containing heat storage medium 105) for containing heat storage sand can be arrayed adjacent to each other in the circumferential direction of the desert greenhouse, i.e., a plurality of heat storage modules 100 are sequentially connected in the lateral and longitudinal directions to form a "sand wall" for blocking desert sandstorms; at the same time, the plurality of heat storage modules 100 forming the "sand wall" serve as heat supply modules for the desert greenhouse to provide heat supply to the desert greenhouse. Specifically, adjacent heat storage modules 100 (or heat storage shells 101 for containing heat storage medium 105) can be fluidly connected to each other through the heat exchange medium inlet 106 and the heat exchange medium outlet 108 of the internal heat exchange coil 107 to allow the heat exchange medium to circulate and flow in each heat storage module 100 (or heat storage shell 101 for containing heat storage medium 105). Alternatively, a predetermined number of heat storage modules 100 are connected in series to form a heat storage unit, and a plurality of heat storage units formed by connecting a predetermined number of heat storage modules 100 in series are connected in parallel.

[0093] According to a preferred embodiment, the bottom of the heat storage module 100 (or the heat storage shell 101 for containing heat storage medium 105) can be configured in the form of a notch, so that the upper and lower heat storage sandboxes in the longitudinal direction can be butted and combined through the notch. A plurality of heat storage modules 100 are combined and arrayed in the circumferential direction of the desert greenhouse to partially or completely surround the desert greenhouse. More specifically, when a plurality of heat storage modules 100 are combined into a "sand wall", some of the heat storage modules 100 can contain heat storage sand, such as one or more heat storage modules 100 longitudinally close to the middle, while the remaining heat storage modules 100 can be empty sandboxes, such as one or more heat storage modules 100 at the periphery in the longitudinal and lateral directions, so that the empty sandboxes at the periphery can serve as thermal insulation components, and the heat storage modules 100 containing heat storage sand in the inner layer can serve as heat storage components.

[0094] According to a preferred embodiment, the present application also provides a heating method based on a desert greenhouse combined heating system, which can include the following steps:

[0095] providing heat energy to the desert greenhouse by configuring the heat storage module 100 containing heat storage medium 105 containing sand;

[0096] providing a first energy supply sub-module 410 and a second energy supply sub-module 420 capable of independently providing controllable heat sources to the heat storage medium 105 in the heat storage module 100;

[0097] based on the correlation between outdoor temperature information and a preset energy consumption temperature balance point, dynamically adjusting the energy supply mode of the first energy supply sub-module 410 and the second energy supply sub-module 420 to the heat storage module 100 to maintain the set temperature environment provided by the desert greenhouse to the plants.

[0098] According to a preferred embodiment, dynamically adjusting the energy supply mode of the first energy supply sub-module 410 and the second energy supply sub-module 420 to the heat storage module 100 based on the correlation between the outdoor temperature information and the preset energy consumption temperature balance point to maintain the set temperature environment provided by the desert greenhouse to the plants can include:

[0099] if the outdoor temperature is higher than the preset energy consumption temperature balance point, starting the first energy supply sub-module 410 to provide a controllable first heat source to the sand-containing heat storage medium 105 in the heat storage module 100 to maintain the set temperature environment;

[0100] if the outdoor temperature is not higher than the preset energy consumption temperature balance point, starting the second energy supply sub-module 420 to provide a controllable second heat source to the sand-containing heat storage medium 105 in the heat storage module 100 to maintain the set temperature environment.

[0101] According to a preferred embodiment, starting the first energy supply sub-module 410 to provide a controllable first heat source to the sand-containing heat storage medium 105 in the heat storage module 100 to maintain the set temperature environment can include:

[0102] if the stored heat value of the heat storage module 100 is lower than the second threshold value, the controller 300 controls the first energy supply sub-module 410 to provide a controllable first heat source to the heat storage module 100 at a first power in a manner that the stored heat value of the heat storage module 100 is not lower than the second threshold value;

[0103] if the stored heat value of the heat storage module 100 is at the second threshold value, the controller 300 controls the first energy supply sub-module 410 to provide a controllable first heat source to the heat storage module 100 at a second power in a manner that the heat storage module 100 maintains the stored heat value of the second threshold value.

[0104] According to a preferred embodiment, starting the second energy supply sub-module 420 to provide a controllable second heat source to the sand-containing heat storage medium 105 in the heat storage module 100 to maintain the set temperature environment can include:

[0105] if the stored heat value of the heat storage module 100 is higher than the first threshold value, the controller 300 adjusts the second energy supply sub-module 420 to the standby state until the stored heat value of the heat storage module 100 reaches the first threshold value, and the controller 300 controls the second energy supply sub-module 420 to provide a controllable second heat source to the heat storage module 100 at a third power in a manner that the heat storage module 100 maintains the stored heat value of the first threshold value.

[0106] According to a preferred embodiment, in the present application, the preset energy consumption temperature balance point is determined in association with a desired set temperature threshold of the desert greenhouse. Specifically, since the temperature inside the greenhouse is uncertain due to different seasons, different time periods, different plants and different growth stages of the plants, etc., the set temperature threshold will be different in view of the influence of the above factors. In order to maintain different set temperature thresholds, the heating unit needs to provide or generate heat output with different energy consumption ratios to adapt to the heat demand under different set temperature thresholds. In addition, different specifications of the heating unit will affect its heating efficiency, so that in order to maintain the same set temperature threshold, the energy consumption ratio of the heating unit of different specifications will fluctuate, so that the preset energy consumption temperature balance point corresponding to the same energy consumption ratio of different heating units is also different.

[0107] Those skilled in the art will understand that other steps or operations can be included before or after, or between, the steps described above without departing from the scope of the present application, for example, further optimizing and / or improving the method described in the present application. In addition, the method described in the present application is shown and described as a series of actions performed in sequence, but it should be understood that the method is not limited by the sequence. For example, some actions can occur in a different order than described herein. Alternatively, one action can occur simultaneously with another action.

[0108] It should be noted that the above specific embodiments are exemplary, and those skilled in the art can come up with various solutions under the inspiration of the disclosure of the present application, and these solutions also belong to the disclosed range of the present application and fall within the protection scope of the present application. Those skilled in the art should understand that the specification and drawings of the present application are illustrative and do not constitute a limitation on the claims. The protection scope of the present application is defined by the claims and their equivalents. The specification of the present application contains multiple inventive concepts, such as "preferably", "according to a preferred embodiment" or "optionally", which all indicate that the corresponding paragraph discloses an independent concept, and the applicant reserves the right to file a divisional application according to each inventive concept.

Claims

1. A combined heating system for a desert greenhouse, characterized in that, include: A thermal storage module (100) is used to provide heat energy converted from a sand-containing thermal storage medium (105) to a desert greenhouse; The power supply module (400) includes a first power supply submodule (410) and a second power supply submodule (420) capable of independently providing a controllable heat source to the sand-containing heat storage medium (105) in the heat storage module (100); A controller (300), communicatively coupled to the power supply module (400), is configured to dynamically adjust the power supply modes of the first power supply submodule (410) and the second power supply submodule (420) for the thermal storage module (100) based on the correlation between outdoor temperature information and a preset energy consumption temperature balance point, so as to maintain the set temperature environment provided to the plants in the desert greenhouse. If the outdoor temperature is higher than the preset energy consumption temperature balance point, the controller (300) activates the first energy supply submodule (410) to provide a controllable first heat source to the sand-containing heat storage medium (105) in the heat storage module (100) to maintain the set temperature environment; if the outdoor temperature is not higher than the preset energy consumption temperature balance point, the controller (300) activates the second energy supply submodule (420) to provide a controllable second heat source to the sand-containing heat storage medium (105) in the heat storage module (100) to maintain the set temperature environment. If the stored calorific value of the thermal storage module (100) is lower than the second threshold, the controller (300) controls the first power supply submodule (410) to provide a controllable first heat source to the thermal storage module (100) at a first power in a manner that ensures the stored calorific value of the thermal storage module (100) is not lower than the second threshold; if the stored calorific value of the thermal storage module (100) is at the second threshold, the controller (300) controls the first power supply submodule (410) to provide a controllable first heat source to the thermal storage module (100) at a second power in a manner that ensures the thermal storage module (100) maintains the stored calorific value of the second threshold. If the stored calorific value of the thermal storage module (100) is higher than the first threshold, the controller (300) adjusts the second energy supply submodule (420) to an active standby state until the stored calorific value of the thermal storage module (100) reaches the first threshold. The controller (300) then controls the second energy supply submodule (420) to provide a controllable second heat source to the thermal storage module (100) at a third power in a manner that keeps the stored calorific value of the thermal storage module (100) at the first threshold.

2. The desert greenhouse combined heating system according to claim 1, characterized in that, The first energy supply submodule (410) and the second energy supply submodule (420) execute the energy supply mode for the thermal storage module (100) based on a first threshold related to the stored calorific value of the sand-containing thermal storage medium (105) in the thermal storage module (100) as a trigger event.

3. The desert greenhouse combined heating system according to claim 2, characterized in that, The preset energy consumption temperature balance point is determined in relation to the desired set temperature threshold of the desert greenhouse.

4. The desert greenhouse combined heating system according to claim 3, characterized in that, The first energy supply submodule (410) is an air source heat pump, and the second energy supply submodule (420) is an electric heating device.

5. A heating method for a combined heating system in a desert greenhouse, characterized in that, include: Thermal energy is supplied to the desert greenhouse through a thermal storage module (100) containing a thermal storage medium (105) containing sand; A first energy supply submodule (410) and a second energy supply submodule (420) are provided, which are capable of independently providing a controllable heat source to the heat storage medium (105) in the heat storage module (100); Based on the correlation between outdoor temperature information and the preset energy consumption temperature balance point, the energy supply modes of the first energy supply submodule (410) and the second energy supply submodule (420) for the heat storage module (100) are dynamically adjusted to maintain the set temperature environment provided to the plants by the desert greenhouse. If the outdoor temperature is higher than the preset energy consumption temperature balance point, the first energy supply submodule (410) is activated to provide a controllable first heat source to the sand-containing heat storage medium (105) in the heat storage module (100) to maintain the set temperature environment; if the outdoor temperature is not higher than the preset energy consumption temperature balance point, the second energy supply submodule (420) is activated to provide a controllable second heat source to the sand-containing heat storage medium (105) in the heat storage module (100) to maintain the set temperature environment. If the stored calorific value of the heat storage module (100) is lower than the second threshold, the first energy supply submodule (410) is controlled to provide a controllable first heat source to the heat storage module (100) at a first power in a manner that ensures the stored calorific value of the heat storage module (100) is not lower than the second threshold; if the stored calorific value of the heat storage module (100) is at the second threshold, the first energy supply submodule (410) is controlled to provide a controllable first heat source to the heat storage module (100) at a second power in a manner that ensures the heat storage module (100) maintains the stored calorific value of the second threshold. If the stored calorific value of the heat storage module (100) is higher than the first threshold, the second energy supply submodule (420) is adjusted to an active standby state until the stored calorific value of the heat storage module (100) reaches the first threshold. The second energy supply submodule (420) is controlled to provide a controllable second heat source to the heat storage module (100) with a third power in a manner that keeps the stored calorific value of the heat storage module (100) at the first threshold.

6. The heating method according to claim 5, characterized in that, Also includes: The first energy supply submodule (410) and the second energy supply submodule (420) provide heat to the heat storage module (100) by using a first threshold related to the stored calorific value of the sand-containing heat storage medium (105) in the heat storage module (100) as a trigger event.

Images