An air-conditioning heat exchange system combining solar energy and air thermal energy

Abstract

The present invention discloses an air-conditioning heat exchange system combining solar energy and air heat energy, which relates to the technical field of air-conditioning heat exchange. The heat exchange system includes a compressor, and the compressor is connected in series with an internal heat exchanger and a first external heat exchanger that form a loop in sequence through a four-way reversing valve and using pipelines. It also includes a second external heat exchanger connected in parallel with the first external heat exchanger. It further includes a solar collector, and the solar collector is connected in parallel with the first external heat exchanger. Expansion valves are provided between the first external heat exchanger, the second external heat exchanger, the solar collector and the internal heat exchanger. In the present invention, solar heating is added to the air heat energy heating system, and at the same time, the external heat exchanger outdoors is divided into two parallel loops. The heating circuit of the solar heating is connected in parallel with one external heat exchanger loop and is connected to the other external heat exchanger through a solenoid valve. The refrigerant flow direction in the heating system can be adjusted according to different heating requirements to realize three functions: heating, defrosting heating and refrigeration.

Description

Technical Field

[0001] The present invention relates to the technical field of air-conditioning heat exchange, and specifically to an air-conditioning heat exchange system that combines solar energy and air heat energy. Background Art

[0002] An air heat energy heating system utilizes a refrigerant to absorb the air heat energy in the outdoor environment. Its working principle is equivalent to the reverse cycle of an air-conditioning refrigeration system. Through a compressor, the refrigerant after heat absorption is compressed into a high-temperature and high-pressure gas and brought into an indoor heat exchanger for a heat exchange cycle. Compared with traditional electric heating, air heat energy heating greatly improves the heating effect and reduces power consumption, which is a new way for the development of energy-saving heating.

[0003] When using an air heat energy heating system for heating in a high-humidity and severe cold area, due to the increase in air humidity and low-temperature conditions, the external heat exchanger in the air heat energy heating system often frosts, resulting in a frost layer around the heat exchange tubes of the external heat exchanger, greatly reducing the heat exchange efficiency of the external heat exchanger and leading to a decrease in the indoor heating effect and poor heating performance.

[0004] In the prior art, the defrosting method for the external heat exchanger in an air heat energy heating system usually makes the refrigerant in the heating system reverse cycle. Through the compressor, the compressed high-temperature and high-pressure refrigerant gas is first passed into the external heat exchanger to release heat and defrost, which results in a significant reduction in the heating effect during defrosting and even the situation where heating is impossible during defrosting. Summary of the Invention

[0005] The purpose of the present invention is to provide an air-conditioning heat exchange system that combines solar energy and air heat energy. By adding solar heat exchange, the air heat energy heating system can use the absorbed solar heat to defrost the external heat exchanger in the heat exchange system, and at the same time, it can also use the absorbed solar heat to participate in the heat exchange cycle of air heat energy to increase the indoor heating effect and ensure stable indoor heating during defrosting.

[0006] To achieve the above purpose, the present invention provides the following technical solution: An air-conditioning heat exchange system that combines solar energy and air heat energy, including a compressor, the compressor is sequentially connected in series with an internal heat exchanger and a first external heat exchanger that form a loop through a four-way reversing valve and pipes.

[0007] It further includes a second external heat exchanger that is parallel to the first external heat exchanger, and the second external heat exchanger is close to the first external heat exchanger.

[0008] It further includes a solar collector, and the solar collector is parallel to the first external heat exchanger.

[0009] An expansion valve is provided between the first external heat exchanger, the second external heat exchanger and the solar collector and the internal heat exchanger.

[0010] A first solenoid valve is provided on the pipeline connected to the liquid outlet of the solar collector, and a third solenoid valve is provided on the pipeline connecting the expansion valve and the second external heat exchanger. The pipeline section between the solar collector and the first solenoid valve and the pipeline section between the third solenoid valve and the second external heat exchanger are communicated through a pipeline and a second solenoid valve.

[0011] Preferably, both the first external heat exchanger and the second external heat exchanger adopt coiled heat exchange tubes, and the two coiled heat exchange tubes are attached to each other vertically and staggeredly.

[0012] Preferably, fins are provided on the outer sides of the first external heat exchanger and the second external heat exchanger.

[0013] Preferably, two expansion valves are adopted. One expansion valve is communicated at the liquid inlet of the solar collector, and the other expansion valve is connected in series between the internal heat exchanger and the first external heat exchanger and the second external heat exchanger.

[0014] Preferably, one expansion valve is adopted. One end of the expansion valve is communicated with the internal heat exchanger through a pipeline, and the other end of the expansion valve is communicated with the solar collector, the first external heat exchanger and the second external heat exchanger through pipelines respectively.

[0015] Preferably, expansion valves are provided on the circulation pipelines of the solar collector, the first external heat exchanger and the second external heat exchanger.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0017] 1. In the present invention, solar heating is added to the air energy heating system. At the same time, the outdoor external heat exchanger is divided into two parallel circuits. The heating circuit of the solar heating is connected in parallel with one external heat exchanger circuit and is communicated with the other external heat exchanger through a solenoid valve. The refrigerant flow direction in the heating system can be adjusted according to different heating requirements, and three functions of heating, defrosting heating and refrigeration can be realized.

[0018] 2. When only heating is carried out in the present invention, the two external heat exchangers simultaneously exchange heat with the air energy in the outdoor environment, and the solar collector simultaneously absorbs heat and transfers heat to the refrigerant. The refrigerant circulation path of the solar collector is in a parallel relationship with the two external heat exchangers. The solar collector and the external heat exchanger exchange heat independently and do not affect each other, greatly increasing the heating efficiency and the heat exchange effect indoors.

[0019] 3. In the present invention, during defrosting, the refrigerant in the solar collector enters an external heat exchanger through one path to release heat under the control of the solenoid valve, defrosting by releasing heat to the two external heat exchangers. The excess heat released will be absorbed by the other external heat exchanger until the temperatures of the two external heat exchangers reach equilibrium, reducing the outward transfer of heat while ensuring the defrosting function and reducing heat loss during defrosting.

[0020] 4. In the present invention, during defrosting, the flow direction of the refrigerant in the heat exchange system still first flows from the compressor into the internal heat exchanger in the room, the same as the flow direction when not defrosting, ensuring that the high-temperature and high-pressure refrigerant gas compressed by the compressor first flows into the room to ensure the heating effect. And all the heat energy required for defrosting is provided by the heat absorbed by the solar collector, defrosting without affecting the indoor heating effect and avoiding the problem of reduced heating effect during the defrosting process.

[0021] 5. In the present invention, during refrigeration, the flow direction of the refrigerant is changed by the four-way reversing valve, so that the refrigerant first enters the two external heat exchangers to release heat, and is depressurized by the expansion valve to form a low-temperature and low-pressure refrigerant vapor-liquid mixture, which finally flows into the internal heat exchanger to absorb heat and evaporate to refrigerate the room. During the refrigeration process, the pipeline of the solar collector is controlled to be in a closed state by the solenoid valve to avoid the influence of the solar collector on the refrigeration cycle. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic structure of the present invention Figure 1 (Two expansion valves are used);

[0023] Figure 2 It is a schematic diagram of the refrigerant circulation mode of the present invention during indoor heating;

[0024] Figure 3 It is a schematic diagram of the refrigerant circulation mode of the present invention during indoor heating and defrosting of the external heat exchanger;

[0025] Figure 4 It is a schematic diagram of the refrigerant circulation mode of the present invention during indoor refrigeration;

[0026] Figure 5 It is a diagram of the setting mode of the external heat exchanger of the present invention;

[0027] Figure 6 It is a schematic diagram of the staggered arrangement of the external heat exchanger of the present invention Figure 1 ;

[0028] Figure 7 It is a schematic diagram of the staggered arrangement of the external heat exchanger of the present invention Figure 2 ;

[0029] Figure 8 It is a schematic structure of the present invention Figure 2(One expansion valve is adopted).

[0030] In the figure:

[0031] 1 - Compressor, 2 - Internal heat exchanger, 3 - Solar collector, 4 - First external heat exchanger, 5 - Second external heat exchanger, 6 - Four-way reversing valve, 7 - First expansion valve, 8 - Second expansion valve, 9 - First solenoid valve, 10 - Second solenoid valve, 11 - Third solenoid valve, 12 - Fins. Specific embodiments

[0032] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0033] As Figures 1 to 7 shown, an air-conditioning heat exchange system combining solar energy and air heat energy includes a compressor 1. The compressor 1 is connected in series with an internal heat exchanger 2 and a first external heat exchanger 4 that form a loop through a four-way reversing valve 6 and using pipelines. Refrigerant, such as freon, is provided in the pipeline, and the refrigerant circulates in the loop under the compression power of the compressor 1.

[0034] It further includes a second external heat exchanger 5 connected in parallel with the first external heat exchanger 4 through a pipeline, and the second external heat exchanger 5 is close to the first external heat exchanger 4.

[0035] It further includes a solar collector 3, and the solar collector 3 is connected in parallel with the first external heat exchanger 4 through a pipeline.

[0036] An expansion valve is provided between the first external heat exchanger 4, the second external heat exchanger 5 and the solar collector 3 and the internal heat exchanger 2.

[0037] A first solenoid valve 9 is provided on the pipeline connected to the liquid outlet of the solar collector 3, and a third solenoid valve 11 is provided on the pipeline connecting the expansion valve and the second external heat exchanger 5. The pipeline section between the solar collector 3 and the first solenoid valve 9 and the pipeline section between the third solenoid valve 11 and the second external heat exchanger 5 are connected and provided through a pipeline and a second solenoid valve 10.

[0038] In this embodiment, the exhaust port of the compressor 1 is connected to the refrigerant inlet of the four-way reversing valve 6 through a pipeline, and the suction port of the compressor 1 is connected to the refrigerant outlet of the four-way reversing valve 6 through a pipeline. The indoor unit interface of the four-way reversing valve 6 is connected to the internal heat exchanger 2 through a pipeline, and the outdoor unit interface of the four-way reversing valve 6 is connected to the first external heat exchanger 4 and the second external heat exchanger 5 through pipelines respectively. It should be noted that the compressor 1, the four-way reversing valve 6, and the internal heat exchanger 2 in this embodiment are existing conventional technologies, and their specific connection methods are the same as those of the compressor, the four-way reversing valve, and the internal heat exchanger of traditional conventional air conditioners, and their specific connection methods will not be elaborated too much here. The difference is that two sets of external heat exchangers are independently adopted in the present invention. For the convenience of distinction, they are tentatively designated as the first external heat exchanger 4 and the second external heat exchanger 5. The first external heat exchanger 4 and the second external heat exchanger 5 are connected in parallel in the refrigerant loop system. Therefore, the first external heat exchanger 4 and the second external heat exchanger 5 are connected in parallel to the outdoor unit interface of the four-way reversing valve 6 through pipelines.

[0039] As a specific embodiment, as Figures 5 to 6 shown, both the first external heat exchanger 4 and the second external heat exchanger 5 adopt conventional heat exchange tubes, such as coiled copper tubes, etc. The two coiled heat exchange tubes are laminated up and down in a staggered manner. (As Figure 7 shown, for the convenience of seeing the arrangement mode of the two heat exchange tubes, one of the heat exchange tubes in Figure 6 is filled and distinguished to form Figure 7 )

[0040] In this embodiment, fins 12 are provided on the outer sides of the first external heat exchanger 4 and the second external heat exchanger 5, which are the same as the fins provided on traditional heat exchangers and are used to improve the heat exchange efficiency.

[0041] The first setting method of the expansion valve:

[0042] As Figure 1 shown, two expansion valves are adopted. One expansion valve is connected in series at the liquid inlet of the solar collector 3, that is, on the connected pipeline section between the internal heat exchanger 2 and the solar collector 3; the other expansion valve is connected in series between the internal heat exchanger 2 and the first external heat exchanger 4 and the second external heat exchanger 5.

[0043] For the convenience of distinction, the two expansion valves are respectively the first expansion valve 7 and the second expansion valve 8. The first expansion valve 7 is connected in series on the connecting pipeline between the internal heat exchanger 2 and the solar collector 3; the second expansion valve 8 is connected in series on the connecting pipeline of the internal heat exchanger 2 and the first external heat exchanger 4 and the second external heat exchanger 5. That is, the first expansion valve 7 is separately provided on the circulation pipeline of the solar collector 3, and the first external heat exchanger 4 and the second external heat exchanger 5 share the second expansion valve 8 in common for their circulation pipelines.

[0044] The second setting method of the expansion valve:

[0045] As Figure 8 shown, one expansion valve is adopted. One end of the expansion valve is connected to the internal heat exchanger 2 through a pipeline, and the other end of the expansion valve is respectively connected to the solar collector 3, the first external heat exchanger 4, and the second external heat exchanger 5 through pipelines, that is, the solar collector 3, the first external heat exchanger 4, and the second external heat exchanger 5 share one expansion valve.

[0046] The third setting method of the expansion valve (not shown in the figure):

[0047] Expansion valves are provided on the circulation pipelines of the solar collector 3, the first external heat exchanger 4, and the second external heat exchanger 5, that is, three expansion valves are adopted, and the solar collector 3, the first external heat exchanger 4, and the second external heat exchanger 5 each separately share one expansion valve.

[0048] Working principle:

[0049] Taking the first setting method of the expansion valve as an example:

[0050] 1. When using the internal heat exchanger 2 for heating (as Figure 2 shown), the four-way reversing valve 6 controls the refrigerant in the loop system to flow from the compressor 1 towards the internal heat exchanger 2. The first solenoid valve 9 and the third solenoid valve 11 are in the open state, and the second solenoid valve 10 is in the closed state.

[0051] The high-temperature and high-pressure refrigerant gas compressed by the compressor 1 first flows through the internal heat exchanger 2. The internal heat exchanger 2 releases heat, enabling the indoor air to absorb heat. Subsequently, the refrigerant flows into the first expansion valve 7 and the second expansion valve 8 respectively to be depressurized and vaporized, reducing the temperature. Part of the refrigerant flows into the solar collector 3 through the second expansion valve 8 to absorb heat, and the other part of the refrigerant flows into the first external heat exchanger 4 and the second external heat exchanger 5 through the first expansion valve 7. At this time, the refrigerant absorbs heat from the outdoor environment through the first external heat exchanger 4 and the second external heat exchanger 5. The two parts of the refrigerant finally converge and flow back into the compressor 1 to complete the heating cycle.

[0052] 2. When using the internal heat exchanger 2 for heating and defrosting the two external heat exchangers (as Figure 3 shown), the four-way reversing valve 6 controls the refrigerant in the loop system to flow from the compressor 1 towards the internal heat exchanger 2. The second solenoid valve 10 is in the open state, and the first solenoid valve 9 and the third solenoid valve 11 are in the closed state.

[0053] The high-temperature and high-pressure refrigerant gas compressed by the compressor 1 first flows through the internal heat exchanger 2. The internal heat exchanger 2 releases heat, enabling the indoor air to absorb heat. Subsequently, the refrigerant flows into the first expansion valve 7 and the second expansion valve 8 respectively to be depressurized and vaporized, reducing the temperature. A part of the refrigerant flows through the second expansion valve 8 into the solar collector 3 to absorb heat. The refrigerant flowing out of the solar collector 3 enters the second external heat exchanger 5 through the second solenoid valve 10. Another part of the refrigerant flows through the first expansion valve 7 into the first external heat exchanger 4. Since the temperature and heat of the refrigerant that has exchanged heat through the solar collector 3 have both increased, the temperature of the refrigerant flowing through the second external heat exchanger 5 is higher than the outdoor environment. At this time, the second external heat exchanger 5 is in a heat release state, defrosting the frost on the outside of the second external heat exchanger 5. Meanwhile, the heat is transferred to the first heat exchanger 4 through the fins 12 to defrost the first heat exchanger 4. The excess heat is also absorbed by the refrigerant flowing into the first external heat exchanger 4 until the temperature between the first heat exchanger 4 and the second external heat exchanger 5 is balanced. Finally, all the refrigerant converges through the first heat exchanger 4 and the second external heat exchanger 5 and reflows into the compressor 1 to complete the heating cycle and defrosting operation.

[0054] 3. When refrigerating with the internal heat exchanger 2 (as Figure 4 shown), the four-way reversing valve 6 controls the refrigerant in the loop system to flow from the compressor 1 towards the first external heat exchanger 4 and the second external heat exchanger 5. The first solenoid valve 9 and the second solenoid valve 10 are in the closed state, and the refrigerant cannot flow through the solar collector 3. The third solenoid valve 11 is in the open state.

[0055] The high-temperature and high-pressure refrigerant gas compressed by the compressor 1 first flows through the first external heat exchanger 4 and the second external heat exchanger 5. The high-temperature and high-pressure refrigerant gas exchanges heat with the outdoor environment through the first external heat exchanger 4 and the second external heat exchanger 5 and releases heat, becoming a low-temperature and high-pressure refrigerant liquid. The two paths of refrigerant liquid finally converge and pass through the first expansion valve 7 to be depressurized into a low-temperature and low-pressure vapor-liquid mixture. The vapor-liquid mixture of the refrigerant then enters the internal heat exchanger 2 to exchange heat with the indoor air. The vapor-liquid mixture of the refrigerant absorbs heat and evaporates into a gas state and re-enters the compressor 1 to complete the refrigeration cycle.

[0056] It should be noted that in this embodiment, the installation methods of the compressor 1 and the expansion valve are the same as those of the compressor and the expansion valve in a traditional air conditioner, and they are both installed in the indoor unit of the air conditioner; the solar collector 3 is installed on a building or the ground outdoors with good lighting; the installation methods of the first external heat exchanger 4, the second external heat exchanger 5, and the four-way reversing valve 6 are the same as those of the heat exchanger and the four-way reversing valve in a traditional air conditioner, and they are all installed in the outdoor unit of the air conditioner; the first solenoid valve 9, the second solenoid valve 10, and the third solenoid valve 11 are all installed in the outdoor unit of the air conditioner according to the principle of proximity. The above structures belong to existing conventional technologies, and their specific installation methods are all adaptive installations, and the detailed setting methods will not be elaborated here.

[0057] Furthermore, since the outdoor frosting conditions are: 1. the outdoor ground temperature drops to zero degree; 2. the water content of the air reaches 100%. Therefore, a temperature and humidity detector can be set in the outdoor unit to detect whether the outdoor temperature and humidity reach the frosting conditions. The temperature and humidity detector is electrically connected to the air conditioner controller of the indoor unit of the air conditioner. If the frosting conditions are reached, the temperature and humidity detector will form an electric signal of the defrosting instruction and transmit it to the air conditioner controller, and the control loop system will change to Figure 3 the cycle state shown in the figure for defrosting.

[0058] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claims involved.

Claims

1. An air-conditioning heat exchange system combining solar energy and air heat energy, characterized in that: It includes a compressor (1), and the compressor (1) is sequentially connected in series with an internal heat exchanger (2) and a first external heat exchanger (4) that form a loop through a four-way reversing valve (6) and using pipelines. It further includes a second external heat exchanger (5) connected in parallel with the first external heat exchanger (4), and the second external heat exchanger (5) is close to the first external heat exchanger (4). It further includes a solar collector (3), and the solar collector (3) is connected in parallel with the first external heat exchanger (4). An expansion valve is provided between the first external heat exchanger (4), the second external heat exchanger (5) and the solar collector (3) and the internal heat exchanger (2). A first solenoid valve (9) is provided on the pipeline connected to the liquid outlet of the solar collector (3), and a third solenoid valve (11) is provided on the pipeline connecting the expansion valve and the second external heat exchanger (5). The pipeline section between the solar collector (3) and the first solenoid valve (9) and the pipeline section between the third solenoid valve (11) and the second external heat exchanger (5) are communicated through a pipeline and a second solenoid valve (10). Both the first external heat exchanger (4) and the second external heat exchanger (5) adopt coiled heat exchange tubes, and the two coiled heat exchange tubes are laminated up and down in a staggered manner. Fins (12) are provided on the outer sides of the first external heat exchanger (4) and the second external heat exchanger (5). Two expansion valves are adopted. One expansion valve is communicated at the liquid inlet of the solar collector (3), and the other expansion valve is connected in series between the internal heat exchanger (2) and the first external heat exchanger (4) and the second external heat exchanger (5).

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