Preheating system for cold air

Abstract

The invention discloses a cold air preheating system which comprises an air source heat pump, an air preheater and a photo-thermal heat collector. Wherein the air source heat pump is connected with the air preheater in series, and cold air enters the air source heat pump through a first channel in the air preheater; wherein heat obtained by the photo-thermal collector is transmitted to the air preheater through a first heat-conducting medium so as to preheat the cold air through a second channel of the air preheater, and the first channel is parallel to the second channel. The problem that the defrosting effect on the air source heat pump is poor under the conditions that the air source heat pump works in low-temperature and high-humidity areas and the like is solved, and the defrosting effect on the air source heat pump is improved.

Description

Technical Field

[0001] The present application relates to the technical field of air source heat pumps, and in particular to a cold air preheating system. Background Art

[0002] Air source heat pumps have the advantages of energy saving, high efficiency, and cleanliness. They can obtain low-grade heat sources from the air, and then convert the low-grade heat sources through part of the electric energy and use them for building heating. Air source heat pumps have been widely used. However, air source heat pumps have high requirements for outdoor environmental temperature and humidity. When heating in low temperature and high humidity areas, the surface of the outdoor heat exchanger of the air source heat pump is prone to frost. The growth of the frost layer will cause the heating performance of the air source heat pump unit to decrease and increase the energy loss of the unit. The longer the air source heat pump frosts, the lower the heating efficiency of the unit. In severe cases, the unit will stop working, so it needs to be defrosted periodically.

[0003] The most commonly used defrosting method is the reverse cycle method. During the defrosting process, the unit stops supplying heat to the building and takes heat from the room to melt the frost layer, which will lead to poor indoor thermal comfort. In addition, the reverse cycle method only defrosts when the frost layer on the surface of the evaporator of the air source heat pump grows to a certain height. There is still a problem of gradually decreasing heating performance due to the growth of the frost layer. In addition, some researchers use electric heating to change the air temperature and humidity at the inlet of the air source heat pump evaporator, which has a better defrosting effect, but the electric heating method consumes too much energy to preheat the air and is not suitable for promotion.

[0004] Therefore, there is a problem in the related art that the defrosting effect of the air source heat pump is poor when the air source heat pump works in low temperature, high humidity areas, etc.

[0005] In the related art, there is no effective solution to the problem of poor defrosting effect of air source heat pumps when the air source heat pumps work in low temperature and high humidity areas. Summary of the invention

[0006] The embodiment of the present application provides a cold air preheating system to at least solve the problem in the prior art that the defrosting effect of the air source heat pump is poor when the air source heat pump operates in low temperature, high humidity areas, etc.

[0007] According to one embodiment of the embodiments of the present application, a method for preheating cold air is provided, comprising: an air source heat pump, an air preheater, and a photothermal collector; wherein the air source heat pump is connected in series with the air preheater, and cold air enters the air source heat pump through a first channel in the air preheater; wherein the heat acquired by the photothermal collector is transferred to the air preheater through a first heat transfer medium to preheat the cold air through a second channel of the air preheater, wherein the first channel is parallel to the second channel.

[0008] In an exemplary embodiment, the system also includes: a return water preheater; wherein the air source heat pump is connected in series with the return water preheater, and the return water of the air source heat pump flows into the air source heat pump through the third channel of the return water preheater; wherein the heat acquired by the solar thermal collector is transferred to the return water preheater through the first heat transfer medium to preheat the return water through the fourth channel of the return water preheater, wherein the third channel is parallel to the fourth channel.

[0009] In an exemplary embodiment, the photothermal collector is connected in series with the air preheater, and the first heat transfer medium flows through the second channel; wherein the photothermal collector is connected in series with the return water preheater, and the first heat transfer medium flows through the fourth channel.

[0010] In an exemplary embodiment, the system further includes: a heat storage tank; wherein the solar thermal collector is connected in series with the heat storage tank, and the heat acquired by the solar thermal collector is stored in the heat storage tank through a second heat transfer medium, wherein the second heat transfer medium flows through a fifth channel of the heat storage tank, and the first heat transfer medium includes: the second heat transfer medium.

[0011] In an exemplary embodiment, the sixth channel of the heat storage tank and the second channel of the air preheater form a first circuit, and the heat stored in the heat storage tank preheats the cold air through the first circuit.

[0012] In an exemplary embodiment, the seventh channel of the heat storage tank and the fourth channel of the return water preheater form a second loop, and the heat stored in the heat storage tank preheats the return water through the second loop.

[0013] In an exemplary embodiment, the system further includes: a first circulating water pump; wherein the first circulating water pump is connected in series between the solar thermal collector and the heat storage tank, and the first circulating water pump is used to drive the second heat transfer medium to flow between the solar thermal collector and the heat storage tank.

[0014] In an exemplary embodiment, the system further includes: a first valve; wherein the first valve is connected in series between the solar thermal collector and the heat storage tank, wherein when the first valve is closed, the second heat transfer medium is not allowed to flow in the third circuit formed by the fifth channel of the solar thermal collector and the heat storage tank, wherein when the first valve is opened, the second heat transfer medium is allowed to flow in the third circuit.

[0015] In an exemplary embodiment, the system further includes: a second valve; wherein the second valve is connected in parallel with a target branch, and the target branch includes: the first valve and the solar thermal collector, wherein the second valve is used to isolate the solar thermal collector when the solar thermal collector needs to be repaired.

[0016] In an exemplary embodiment, the system further comprises: a second circulating water pump; wherein the second circulating water pump is connected in series with the return water preheater, and the return water is pumped into the third channel of the return water preheater through the second circulating water pump.

[0017] In the embodiment of the present application, an air source heat pump, an air preheater, and a photothermal collector are connected in series; wherein the air source heat pump is connected in series with the air preheater, and cold air enters the air source heat pump through the first channel in the air preheater; wherein the heat obtained by the photothermal collector is transferred to the air preheater through the first heat conducting medium to preheat the cold air through the second channel of the air preheater, wherein the first channel is parallel to the second channel. In other words, heat is collected by the photothermal collector, and the collected heat is transferred to the second channel of the air preheater through the first heat conducting medium to preheat the cold air flowing through the first channel in the air preheater parallel to the second channel, so that the temperature of the cold air flowing through the second channel rises, thereby reducing the frost rate of the air source heat pump, and fundamentally achieving the technical effect of defrosting the air source heat pump. Therefore, through the above embodiment, the problem of poor defrosting effect of the air source heat pump in the prior art when the air source heat pump works in low temperature and high humidity areas is solved, and the defrosting effect of the air source heat pump is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0019] Figure 1 is an architectural diagram of a cold air preheating system according to an embodiment of the present application;

[0020] Figure 2 is another architecture diagram of a cold air preheating system according to an embodiment of the present application;

[0021] Figure 3 This is another architecture diagram of the cold air preheating system according to an embodiment of the present application. DETAILED DESCRIPTION

[0022] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0023] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products, or devices; "plurality" means two or more.

[0024] In an embodiment of the present application, a cold air preheating system is provided. Figure 1 : is an architecture diagram of a cold air preheating system according to an embodiment of the present application, the system comprising:

[0025] Air source heat pump 101, air preheater 102, and solar thermal collector 103;

[0026] The air source heat pump 101 is connected in series with the air preheater 102, and cold air enters the air source heat pump 101 through the first channel in the air preheater 102;

[0027] The heat obtained by the photothermal collector 103 is transferred to the air preheater 102 through a first heat-conducting medium, so as to preheat the cold air through a second channel of the air preheater 102, wherein the first channel is parallel to the second channel.

[0028] Through the above system, an air source heat pump, an air preheater, and a photothermal collector; wherein the air source heat pump is connected in series with the air preheater, and cold air enters the air source heat pump through the first channel in the air preheater; wherein the heat obtained by the photothermal collector is transferred to the air preheater through the first heat transfer medium to preheat the cold air through the second channel of the air preheater, wherein the first channel is parallel to the second channel. In other words, heat is collected by the photothermal collector, and the collected heat is transferred to the second channel of the air preheater through the first heat transfer medium to preheat the cold air flowing through the first channel in the air preheater parallel to the second channel, so that the temperature of the cold air flowing through the second channel rises, thereby reducing the frost rate of the air source heat pump, and fundamentally realizing the technical effect of defrosting the air source heat pump. Therefore, through the above embodiment, the problem of poor defrosting effect of the air source heat pump in the prior art when the air source heat pump works in low temperature, high humidity areas, etc. is solved, and the defrosting effect of the air source heat pump is improved.

[0029] It should be noted that the Air Source Heat Pump (ASHP) is a heat pump system that uses outdoor air as a heat source or cold source. It transfers heat between the outdoors and indoors through the refrigerant cycle. In heating mode, the air source heat pump can extract heat from the outdoor air, raise the heat to a higher temperature even at lower ambient temperatures, and release it to the interior of the building through the indoor heat exchanger to achieve heating. In cooling mode, it extracts indoor heat and releases it to the outdoors, thereby cooling the interior. Air source heat pumps have been widely used in heating and cooling systems in residential and commercial buildings because of their environmental protection, high efficiency, and energy-saving characteristics.

[0030] Solar Thermal Collector is a device in the solar thermal utilization system, which is mainly used to collect and convert solar radiation energy into thermal energy. Solar thermal collectors are usually composed of a heat absorbing plate, a transparent cover, insulation materials and a heat collecting tube. When sunlight shines on the collector, the heat absorbing plate absorbs solar radiation and converts light energy into thermal energy, and then takes the heat out through the heat conducting medium (usually water or antifreeze) in the heat collecting tube for hot water supply, heating or industrial heat application. Solar thermal collectors can be divided into types such as flat plate collectors and vacuum tube collectors according to their different structures and uses.

[0031] Combining these two technologies, air source heat pumps can work in conjunction with solar thermal collectors to use solar energy to preheat air or water, thereby improving the operating efficiency of air source heat pumps. Especially in cold or sunny areas, solar preheating can effectively reduce the energy consumption of heat pumps and enhance the stability and economy of the system.

[0032] In an exemplary embodiment, Figure 2 As shown, the system also includes: a return water preheater; wherein the air source heat pump is connected in series with the return water preheater, and the return water of the air source heat pump flows into the air source heat pump through the third channel of the return water preheater; wherein the heat acquired by the solar thermal collector is transferred to the return water preheater through the first heat transfer medium, so as to preheat the return water through the fourth channel of the return water preheater, wherein the third channel is parallel to the fourth channel.

[0033] It can be understood that air preheater and return water preheater are two types of heat exchange equipment used to improve energy efficiency and system performance.

[0034] Among them, the air preheater is mainly used to increase the temperature of the air entering the air source heat pump. In this application, the air preheater uses the heat of solar energy obtained by the photothermal collector to preheat the cold air. In this way, the temperature of the air entering the air source heat pump increases and the humidity decreases, which helps to reduce the frost on the surface of the outdoor heat exchanger, thereby improving the heating efficiency and continuous operation time of the air source heat pump. The air preheater is usually designed as a device with a heat exchange medium. When the cold air flows through, the heat exchange medium transfers heat to the air to achieve preheating.

[0035] Among them, the main function of the return water preheater is to preheat the return water from the user end to the heat pump system. Specifically, the return water preheater can use the heat of solar energy obtained by the solar thermal collector to preheat the return water, which can increase the initial temperature of the return water and reduce the energy consumption required by the air source heat pump to reheat the return water, thereby improving the energy efficiency of the entire system. The return water preheater is also a heat exchange device, which transfers the heat of the heat storage tank to the return water through a heat transfer medium to increase the temperature of the return water.

[0036] The use of air preheater and return water preheater can significantly improve the performance of air source heat pump system in low temperature and high humidity environment, reduce energy consumption, and improve the stability and reliability of the system. It is an effective means to improve the energy efficiency of heat pump system and cope with harsh environmental conditions.

[0037] In an exemplary embodiment, the photothermal collector is connected in series with the air preheater, and the first heat transfer medium flows through the second channel; wherein the photothermal collector is connected in series with the return water preheater, and the first heat transfer medium flows through the fourth channel.

[0038] It can be understood that in one implementation, the solar thermal collector can be directly connected in series with the air preheater. When the first heat transfer medium flows out of the solar thermal collector, it carries the heat of the solar energy collected by the solar thermal collector, and then flows into the second channel of the air preheater through the series circuit, thereby preheating the cold air flowing through the first channel of the air preheater parallel to the second channel.

[0039] Similarly, the solar thermal collector can also be directly connected in series with the return water preheater. When the first heat transfer medium flows out of the solar thermal collector, it carries the heat of the solar energy collected by the solar thermal collector, and then flows into the fourth channel of the return water preheater through the series loop, preheating the return water flowing through the third channel parallel to the fourth channel in the return water preheater.

[0040] Optionally, in one implementation, the solar thermal collector, the air preheater and the return water preheater can be connected in series in the same series circuit; in another case, the solar thermal collector is connected in series with the air preheater alone, and is connected in series with the return water preheater alone, and the first heat transfer medium flowing out of the solar thermal collector can be diverted and flow into the air preheater and the return water preheater respectively.

[0041] In addition, in the energy exchange system, the selection of the heat transfer medium (also often referred to as heat exchange fluid or working fluid) is very important. The heat transfer medium is responsible for transferring heat in the system, so that energy is transferred from one part to another. Commonly used heat transfer media include: water, antifreeze, mineral oil, refrigerant, air, thermal silicone oil, and saline solution. The first heat transfer medium can be selected from these commonly used heat transfer media.

[0042] Among them, water is the most common heat transfer medium, with high heat capacity and good thermal conductivity. In solar thermal systems, geothermal systems and water cooling systems, water is usually used as a heat transfer medium to collect, store and transfer heat.

[0043] Among them, as for antifreeze, water will freeze in an environment where the temperature may drop below the freezing point, so antifreeze is needed to prevent freezing. Common antifreeze includes ethylene glycol and propylene glycol aqueous solutions, which have a lower freezing point than water and can also conduct heat.

[0044] Among them, for mineral oil, in some high temperature applications or applications requiring high temperature stability, mineral oil can be used as a heat transfer medium because it has higher thermal stability and lower corrosiveness.

[0045] Among them, for the refrigerant, in the heat pump system, the refrigerant (such as R134a, R410A, etc.) acts as a heat transfer medium. Under the action of the compressor, it absorbs and releases heat through phase change (from liquid to gas, and then from gas to liquid) to achieve energy transfer and conversion.

[0046] Among them, for air, although the heat conduction efficiency of air is low, in some applications that do not require high heat conduction efficiency, such as the ventilation system of a building, air can be used as a heat transfer medium to transfer heat through direct contact between hot air and cold air.

[0047] Among them, in some precision equipment that requires high thermal stability and high thermal conductivity, thermal conductive silicone oil can be used as a heat conduction medium because it has good thermal stability and chemical stability.

[0048] Among them, in some industrial applications, brine solutions (such as sodium chloride and calcium chloride solutions) can be used as heat transfer media to provide additional anti-corrosion and anti-freeze protection.

[0049] In summary, the choice of thermal transfer medium usually depends on the specific application of the system, operating temperature range, cost, environmental factors and safety considerations. When designing an energy exchange system, choosing the right thermal transfer medium is the key to ensuring efficient and safe operation of the system.

[0050] In an exemplary embodiment, the system further includes: a heat storage tank; wherein the solar thermal collector is connected in series with the heat storage tank, and the heat acquired by the solar thermal collector is stored in the heat storage tank through a second heat transfer medium, wherein the second heat transfer medium flows through a fifth channel of the heat storage tank, and the first heat transfer medium includes: the second heat transfer medium.

[0051] Optionally, in another implementation, since the supply of solar energy is intermittent, a heat storage box can be deployed to store the heat collected by the solar thermal collector in the heat storage box, and then the cold air and return water can be preheated through the heat storage box.

[0052] It is understandable that the solar thermal collector and the heat storage tank are connected in series to form a continuous heat energy transfer path. The solar heat absorbed by the solar thermal collector is not directly used to preheat the cold air and return water, but is first transferred to the heat storage tank through the second heat transfer medium. The heat storage tank, as a "heat energy warehouse", can store heat when solar energy is sufficient, and release heat when solar energy is insufficient at night or on rainy days, thereby providing a more stable heat energy supply.

[0053] The second heat transfer medium is a fluid specifically used to transfer heat between the solar thermal collector and the heat storage tank. The second heat transfer medium needs to have high thermal conductivity and thermal stability, and can effectively transfer the heat collected by the collector to the heat storage tank. The second heat transfer medium can include water, antifreeze (such as ethylene glycol), mineral oil or thermal silicone oil.

[0054] The second heat-conducting medium in the heat storage tank flows in the fifth channel. Through the fifth channel, the second heat-conducting medium can effectively exchange heat with the heat in the heat storage tank and store the heat in the heat storage material in the heat storage tank. The heat storage material may be water, molten salt, phase change material, etc. These heat storage materials have high heat capacity and can store a large amount of heat.

[0055] In the above embodiment, the first heat-conducting medium is a broader concept, including the second heat-conducting medium. The first heat-conducting medium may be a fluid circulating in the entire system, while the second heat-conducting medium is only a part of the first heat-conducting medium, which is specifically used for heat transfer between the solar thermal collector and the heat storage tank. Optionally, the first heat-conducting medium and the second heat-conducting medium can be completely the same medium, for example, both are water.

[0056] Therefore, the embodiment of the present application balances the intermittent solar energy supply through the heat storage tank, improving the overall stability and efficiency of the system. By building a heat transfer link between the solar thermal collector and the heat storage tank through a special second heat transfer medium, solar energy can be used more effectively. Even when solar energy is insufficient, the system can continue to operate through the heat energy in the heat storage tank, ensuring the continuous operation and performance of the heat pump system.

[0057] Furthermore, the sixth channel of the heat storage box and the second channel of the air preheater form a first loop, and the heat stored in the heat storage box preheats the cold air through the first loop.

[0058] Furthermore, the seventh channel of the heat storage tank and the fourth channel of the return water preheater form a second loop, and the heat stored in the heat storage tank preheats the return water through the second loop.

[0059] Optionally, a third heat-conducting medium is circulated in the first circuit, and a fourth heat-conducting medium is circulated in the second circuit. The third heat-conducting medium may be a heat-conducting medium that is more suitable for preheating cold air, and the fourth heat-conducting medium may be a heat-conducting medium that is more suitable for conducting heat to cold air. The third heat-conducting medium and the fourth heat-conducting medium may be selected from commonly used heat-conducting media, wherein commonly used heat-conducting media include: water, antifreeze, mineral oil, refrigerant, air, heat-conducting silicone oil, and saline solution.

[0060] It should be noted that the first heat-conducting medium also includes: a third heat-conducting medium and a fourth heat-conducting medium. In some embodiments, any n heat-conducting mediums among the second heat-conducting medium, the third heat-conducting medium and the fourth heat-conducting medium can all be the same heat-conducting medium, where n is greater than 2 and less than 3. For example, the second heat-conducting medium, the third heat-conducting medium and the fourth heat-conducting medium can all be water, and the first heat-conducting medium is also water.

[0061] With respect to the above embodiment, it can be understood that the sixth channel of the heat storage tank is connected to the second channel of the air preheater through a conduit or a heat exchange pipe, forming a complete circulation path, i.e., a first loop. In this loop, the heat stored in the heat storage tank is transferred to the air preheater to preheat the cold air passing through the air preheater.

[0062] Specifically, when the cold air flows through the air preheater, the heat in the heat storage tank is transferred to the cold air through the third heat transfer medium in the first circuit, so that the air temperature increases and the humidity decreases. The preheated air then enters the air source heat pump system, which helps to reduce the frost problem of the outdoor heat exchanger and improve the heating efficiency of the heat pump system.

[0063] With respect to the above embodiment, it can also be understood that the seventh channel of the heat storage tank is connected to the fourth channel of the return water preheater to form a second loop. The second loop can use the heat stored in the heat storage tank to preheat the cold return water returned from the user end.

[0064] Specifically, in the second loop, the heat in the heat storage tank is transferred to the return water preheater through the fourth heat transfer medium to preheat the return water. The return water temperature rises after preheating, and then enters the air source heat pump system for further heating, and then is provided to the user again. This process helps to improve the utilization efficiency of solar heat and reduce the direct heating burden of the air source heat pump, thereby reducing the energy consumption of the system and improving the overall operation efficiency.

[0065] Therefore, through the design of the first and second loops, the system can use the solar heat stored in the heat storage tank under different conditions, preheating the cold air entering the air source heat pump, reducing the frost problem of the heat pump system in harsh environments, and preheating the return water, improving the thermal efficiency of the heat pump system and reducing energy consumption. This system design fully utilizes the potential of solar energy, improves energy utilization efficiency, and also increases the flexibility and stability of the system, providing a more efficient and environmentally friendly heating solution for cold or sunny areas.

[0066] In an exemplary embodiment, the system further includes: a first circulating water pump; wherein the first circulating water pump is connected in series between the solar thermal collector and the heat storage tank, and the first circulating water pump is used to drive the second heat transfer medium to flow between the solar thermal collector and the heat storage tank.

[0067] In an exemplary embodiment, the system further comprises: a second circulating water pump; wherein the second circulating water pump is connected in series with the return water preheater, and the return water is pumped into the third channel of the return water preheater through the second circulating water pump.

[0068] Optionally, a third circulating water pump may also be deployed in the first loop where the heat storage tank and the air preheater are located to drive the third heat transfer medium to flow between the air preheater and the heat storage tank.

[0069] Optionally, a fourth circulating water pump may also be deployed in the second loop where the heat storage tank and the return water preheater are located to drive the fourth heat transfer medium to flow between the return water preheater and the heat storage tank.

[0070] In an exemplary embodiment, the system further includes: a first valve; wherein the first valve is connected in series between the solar thermal collector and the heat storage tank, wherein when the first valve is closed, the second heat transfer medium is not allowed to flow in the third circuit formed by the fifth channel of the solar thermal collector and the heat storage tank, wherein when the first valve is opened, the second heat transfer medium is allowed to flow in the third circuit.

[0071] In an exemplary embodiment, the system further includes: a second valve; wherein the second valve is connected in parallel with a target branch, and the target branch includes: the first valve and the solar thermal collector, wherein the second valve is used to isolate the solar thermal collector when the solar thermal collector needs to be repaired.

[0072] Specifically, when the first valve is closed and the second valve is open, the second heat transfer medium flows through the branch where the second valve is located, and then the branch where the first valve and the solar thermal collector are located are isolated. Under normal circumstances, the first valve is generally opened and the second valve is closed.

[0073] In order to better understand the process of the above-mentioned cold air preheating system, the above-mentioned cold air preheating system is described below in combination with an optional embodiment, but it is not used to limit the technical solution of the embodiment of the present application.

[0074] An optional embodiment of the present application provides an air source heat pump defrosting system based on solar energy (equivalent to the preheating of cold air in the above embodiment), such as Figure 3 As shown, the system includes a solar thermal collector 1, valves 21 and 22, a heat storage tank 3, circulating water pumps 41 and 42, an air preheater 5, a return water preheater 6, and an air source heat pump 7. Among them, the circulating water pump 41 is equivalent to the first circulating water pump in the above embodiment; the circulating water pump 42 is equivalent to the second circulating water pump in the above embodiment; the valve 21 is equivalent to the second valve in the above embodiment; and the valve 22 is equivalent to the first valve in the above embodiment.

[0075] Specifically, the solar thermal collector 1 is connected to the heat storage tank 3. Under the action of the circulating water pump 41, the circulating water (equivalent to the second heat transfer medium in the above embodiment) transfers the heat collected by the solar thermal collector 1 to the heat storage tank 3. The valves 21 and 22 are arranged to adjust the flow direction of the circulating water, improve flexibility, and facilitate system maintenance and start and stop. The heat storage tank 3 stores the heat absorbed by the solar thermal collector 1 during the day, which can be used by the system all day, thereby improving the reliability of the system heating.

[0076] The air preheater 5 is connected to the heat storage tank 3, and the heat of the heat storage tank 3 is provided to the air preheater 5 through a heat transfer medium. The cold air flows through the air preheater 5 for preheating, so that the air temperature increases and the humidity decreases, and then the air is passed into the air source heat pump 7. The return water preheater 6 is connected to the heat storage tank 3, and the heat of the heat storage tank 3 is provided to the return water preheater 6 through a heat transfer medium. The return water preheater 6 preheats the return water before the return water enters the air source heat pump 7, thereby improving the utilization efficiency of solar energy heat. The air source heat pump 7 uses the preheated air to further heat the return water and provide it to the user end for use. The air source heat pump 7 preheated by the air preheater 5 can effectively suppress frost, so that the air source heat pump can operate continuously under a frost-free effect.

[0077] In summary, the optional embodiment of the present application installs an air preheater in front of the air source heat pump, and uses solar energy heat to preheat the cold air. While improving the air performance parameters and the utilization rate of solar energy, it effectively suppresses the frost layer, so that the air source heat pump in cold and humid areas can operate continuously under frost-free conditions to ensure heating efficiency; by configuring a heat storage tank, the problem of intermittent solar energy supply sources is solved, and the system can achieve stable and reliable heating around the clock, which can cope with extreme weather conditions. At the same time, a return water preheater is installed in front of the air source heat pump to preheat the return water using solar energy heat, further improving the utilization rate of solar energy. Therefore, compared with the existing reverse cycle method, the optional embodiment of the present application can achieve continuous defrosting, so that the heating efficiency of the air source heat pump and the heating comfort of the building interior are not affected by frost; compared with the existing electric heating method, the optional embodiment of the present application uses solar energy as the heat source for defrosting the air source heat pump, which has the advantages of cleanliness, low energy consumption and low cost.

[0078] Through the description of the above implementation methods, those skilled in the art can clearly understand that the method according to the above embodiment can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present application, or the part that contributes to the prior art, can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk), and includes a number of instructions for a terminal device (which can be a mobile phone, computer, server, or network device, etc.) to execute the methods of each embodiment of the present application.

[0079] Optionally, the specific examples in this embodiment may refer to the examples described in the above embodiments and optional implementation modes, and this embodiment will not be described in detail here.

[0080] Obviously, those skilled in the art should understand that the above modules or steps of the present application can be implemented by a general computing device, they can be concentrated on a single computing device, or distributed on a network composed of multiple computing devices, and optionally, they can be implemented by a program code executable by a computing device, so that they can be stored in a storage device and executed by the computing device, and in some cases, the steps shown or described can be executed in a different order from that herein, or they can be made into individual integrated circuit modules, or multiple modules or steps therein can be made into a single integrated circuit module for implementation. Thus, the present application is not limited to any specific combination of hardware and software.

[0081] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the principles of the present application shall be included in the protection scope of the present application.

Claims

1. A cold air preheating system, characterized in that: include: Air source heat pumps, air preheaters, and solar thermal collectors; Wherein, the air source heat pump is connected in series with the air preheater, and cold air enters the air source heat pump through the first channel in the air preheater; The heat obtained by the photothermal collector is transferred to the air preheater through a first heat-conducting medium to preheat the cold air through a second channel of the air preheater, wherein the first channel is parallel to the second channel.

2. The cold air preheating system according to claim 1, characterized in that: The system further comprises: a return water preheater; Wherein, the air source heat pump is connected in series with the return water preheater, and the return water of the air source heat pump flows into the air source heat pump through the third channel of the return water preheater; The heat acquired by the photothermal collector is transferred to the return water preheater through the first heat transfer medium to preheat the return water through the fourth channel of the return water preheater, wherein the third channel is parallel to the fourth channel.

3. The cold air preheating system according to claim 2, characterized in that: include: Wherein, the photothermal collector is connected in series with the air preheater, and the first heat-conducting medium flows through the second channel; Wherein, the photothermal collector is connected in series with the return water preheater, and the first heat transfer medium flows through the fourth channel.

4. The cold air preheating system according to claim 2, characterized in that: The system further comprises: a heat storage tank; The photothermal collector is connected in series with the heat storage tank, and the heat obtained by the photothermal collector is stored in the heat storage tank through a second heat transfer medium, wherein the second heat transfer medium flows through the fifth channel of the heat storage tank, and the first heat transfer medium includes: the second heat transfer medium.

5. The cold air preheating system according to claim 4, characterized in that: include: The sixth channel of the heat storage tank and the second channel of the air preheater form a first loop, and the heat stored in the heat storage tank preheats the cold air through the first loop.

6. The cold air preheating system according to claim 4, characterized in that: include: The seventh channel of the heat storage tank and the fourth channel of the return water preheater form a second loop, and the heat stored in the heat storage tank preheats the return water through the second loop.

7. The cold air preheating system according to claim 4, characterized in that: The system further comprises: a first circulating water pump; Wherein, the first circulating water pump is connected in series between the solar thermal collector and the heat storage tank, and the first circulating water pump is used to drive the second heat transfer medium to flow between the solar thermal collector and the heat storage tank.

8. The cold air preheating system according to claim 4, characterized in that: The system further comprises: a first valve; Wherein, the first valve is connected in series between the solar thermal collector and the heat storage tank, wherein when the first valve is closed, the second heat transfer medium is not allowed to flow in the third circuit formed by the fifth channel of the solar thermal collector and the heat storage tank, wherein when the first valve is opened, the second heat transfer medium is allowed to flow in the third circuit.

9. The cold air preheating system according to claim 8, characterized in that: The system further comprises: a second valve; The second valve is connected in parallel with a target branch, and the target branch includes: the first valve and the solar thermal collector, wherein the second valve is used to isolate the solar thermal collector when the solar thermal collector needs to be repaired.

10. The cold air preheating system according to claim 2, characterized in that: The system further comprises: a second circulating water pump; Wherein, the second circulating water pump is connected in series with the return water preheater, and the return water is pumped into the third channel of the return water preheater through the second circulating water pump.

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