Air conditioner heat exchange system combining solar energy and air heat energy

Abstract

The invention discloses an air conditioner heat exchange system combining solar energy and air heat energy, and relates to the technical field of air conditioner heat exchange. The heat exchange system comprises a compressor, and the compressor is sequentially connected with an inner heat exchanger and a first outer heat exchanger in series through a four-way reversing valve and a pipeline to form a loop. And the second external heat exchanger is connected with the first external heat exchanger in parallel. The system further comprises a solar heat collector which is connected with the first external heat exchanger in parallel. Expansion valves are arranged among the first external heat exchanger, the second external heat exchanger, the solar heat collector and the internal heat exchanger. Solar heating is added to the air heat energy heating system, meanwhile, the outdoor external heat exchanger is divided into two loops connected in parallel, the heating circuit of the solar heating is connected with one loop of the external heat exchanger in parallel and communicated with the other loop of the external heat exchanger through the electromagnetic valve, and the flowing direction of refrigerants in the heating system can be adjusted according to different heating requirements; the three functions of heating, defrosting heating and refrigerating are achieved.

Description

Technical Field

[0001] The invention relates to the technical field of air conditioning heat exchange, and in particular to an air conditioning heat exchange system combining solar energy and air thermal energy. Background Art

[0002] The air thermal heating system uses refrigerant to absorb the heat energy of the air in the outdoor environment. Its working principle is equivalent to the reverse cycle of the air conditioning refrigeration system. The compressor compresses the refrigerant after absorbing heat into high-temperature and high-pressure gas and brings it into the indoor heat exchanger for heat exchange. Compared with traditional electric heating, air thermal heating greatly improves the heating effect and reduces electricity consumption. It is a new way to develop energy-saving heating.

[0003] When an air thermal heating system is used for heating in cold and humid areas, the external heat exchanger in the air thermal heating system often frosts due to the increase in air humidity and low temperature conditions, 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, resulting in reduced indoor heating effect and poor heating effect.

[0004] In the prior art, the defrosting method of the external heat exchanger in the air thermal heating system is usually to reverse the circulation of the refrigerant in the heating system, and the compressed high-temperature and high-pressure refrigerant gas is first passed into the external heat exchanger through the compressor, and heat is released to the outside to defrost. This causes the heating effect of indoor heating to be greatly reduced during defrosting, and even the situation that heating cannot be provided during defrosting occurs. 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 thermal energy. By adding solar energy heat exchange, the air thermal energy heating system can use the absorbed solar energy heat to defrost the external heat exchanger in the heat exchange system. At the same time, the absorbed solar energy heat can also be used to add the air thermal energy heat exchange cycle to increase the indoor heating effect and at the same time ensure stable indoor heating during defrosting.

[0006] To achieve the above objectives, the present invention provides the following technical solutions: an air conditioning heat exchange system combining solar energy and air thermal energy, comprising a compressor, wherein the compressor is connected in series with an internal heat exchanger and a first external heat exchanger forming a loop through a four-way reversing valve and a pipeline.

[0007] It also includes a second external heat exchanger connected in parallel with the first external heat exchanger, and the second external heat exchanger is close to the first external heat exchanger.

[0008] It also includes a solar thermal collector, which is connected in parallel with the first external heat exchanger.

[0009] An expansion valve is arranged 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 arranged on the pipeline connected to the liquid outlet of the solar collector, a third solenoid valve is arranged on the pipeline connected between the expansion valve and the second external heat exchanger, and 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 connected through a pipeline and the second solenoid valve.

[0011] Preferably, the first external heat exchanger and the second external heat exchanger both use coiled heat exchange tubes, and the two coiled heat exchange tubes are staggered and attached to each other up and down.

[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 used, one expansion valve is arranged 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, the expansion valve is one, one end of the expansion valve is connected to the internal heat exchanger through a pipeline, and the other end of the expansion valve is connected to the solar collector, the first external heat exchanger and the second external heat exchanger through pipelines.

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

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The present invention adds solar heating to the air thermal 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 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 needs to achieve the three functions of heating, defrosting heating and cooling.

[0018] 2. In the present invention, when only heating is performed, the two external heat exchangers simultaneously exchange heat with the air heat energy in the outdoor environment, the solar collector simultaneously absorbs heat and transfers heat to the refrigerant, the refrigerant circulation circuit of the solar collector and the two external heat exchangers are in a parallel relationship, the solar collector and the external heat exchanger exchange heat independently without affecting each other, which greatly increases the heating efficiency and the indoor heat exchange effect.

[0019] 3. In the present invention, when defrosting, the refrigerant through the solar collector enters one external heat exchanger under the control of the solenoid valve to release heat, and defrosting is performed 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 a balance, thereby reducing the heat transfer to the outside while ensuring the defrosting function, thereby reducing the heat loss during defrosting.

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

[0021] 5. In the present invention, during cooling, the flow direction of the refrigerant is changed by the four-way reversing valve, so that the refrigerant first passes into 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, thereby cooling the room. During the cooling process, the pipeline of the solar collector is controlled by the solenoid valve to be in a closed state, so as to avoid the solar collector from affecting the refrigeration cycle. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The structure of the present invention is schematically shown Figure 1 (Two expansion valves are used);

[0023] Figure 2 This is a schematic diagram of the refrigerant circulation method when the present invention is used for indoor heating;

[0024] Figure 3 A diagram showing the refrigerant circulation mode when the present invention performs indoor heating and defrosting of an external heat exchanger;

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

[0026] Figure 5 This is a diagram showing the arrangement of the external heat exchanger of the present invention;

[0027] Figure 6 Schematic diagram of the staggered arrangement of the external heat exchanger of the present invention Figure 1 ;

[0028] Figure 7 Schematic diagram of the staggered arrangement of the external heat exchanger of the present invention Figure 2 ;

[0029] Figure 8 The structure of the present invention is schematically shown Figure 2(One expansion valve is used).

[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- fin. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] like Figures 1 to 7 As shown, an air conditioning heat exchange system combining solar energy and air thermal energy includes a compressor 1, wherein the compressor 1 is connected in series with an internal heat exchanger 2 and a first external heat exchanger 4 forming a loop through a four-way reversing valve 6 and a pipeline. A refrigerant, such as Freon, is arranged in the pipeline, and the refrigerant circulates in the loop under the compression power of the compressor 1.

[0034] The heat exchanger 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 also includes a solar thermal collector 3, which 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 , the solar collector 3 and the internal heat exchanger 2 .

[0037] A first solenoid valve 9 is arranged on the pipeline connected to the liquid outlet of the solar collector 3, a third solenoid valve 11 is arranged on the pipeline connecting the expansion valve and the second external heat exchanger 5, and 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 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, the air intake 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. It should be noted that the compressor 1, the four-way reversing valve 6, and the internal heat exchanger 2 in this embodiment are conventional technologies, and their specific connection methods are the same as the connection methods of the compressor, the four-way reversing valve, and the internal heat exchanger of the conventional air conditioner, and their specific connection methods are not described in detail here. The difference is that in the present invention, two sets of external heat exchangers are independently used, which are temporarily designated as the first external heat exchanger 4 and the second external heat exchanger 5 for the convenience of distinction. The first external heat exchanger 4 and the second external heat exchanger 5 are connected in parallel in the refrigerant circuit system, so the first external heat exchanger 4 and the second external heat exchanger 5 are connected in parallel with the outdoor unit interface of the four-way reversing valve 6 through a pipeline.

[0039] As a specific implementation method, Figures 5 and 6 As shown, the first external heat exchanger 4 and the second external heat exchanger 5 both use conventional heat exchange tubes, such as coiled copper tubes, etc., and the two coiled heat exchange tubes are staggered and attached up and down (such as Figure 7 As shown in the figure, in order to see the arrangement of the two heat exchange tubes clearly, Figure 6 A heat exchange tube is filled and divided into 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 in the conventional heat exchanger and are used to improve the heat exchange efficiency.

[0041] The expansion valve is arranged in a first manner:

[0042] like Figure 1 As shown, two expansion valves are used, one expansion valve is connected and arranged at the liquid inlet of the solar collector 3, that is, located on the connecting pipe 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 to the connecting pipe between the internal heat exchanger 2 and the solar collector 3; the second expansion valve 8 is connected in series to the connecting pipe between 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 arranged on the circulation pipe of the solar collector 3, and the circulation pipes of the first external heat exchanger 4 and the second external heat exchanger 5 share the second expansion valve 8.

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

[0045] like Figure 8 As shown, the expansion valve is one, 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 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 mode of the expansion valve (not shown in the figure):

[0047] The circulation pipelines of the solar collector 3, the first external heat exchanger 4 and the second external heat exchanger 5 are all provided with expansion valves, that is, three expansion valves are used, and the solar collector 3, the first external heat exchanger 4 and the second external heat exchanger 5 each share an expansion valve.

[0048] Working principle:

[0049] Take the expansion valve setting method 1 as an example:

[0050] 1. When using internal heat exchanger 2 for heating (such as Figure 2 As shown), the four-way reversing valve 6 controls the refrigerant in the loop system to flow from the compressor 1 to 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, and the internal heat exchanger 2 releases heat, allowing the indoor air to absorb heat. Then the refrigerant flows into the first expansion valve 7 and the second expansion valve 8 respectively to reduce pressure and vaporize to reduce the temperature. A 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 outdoor environmental heat through the first external heat exchanger 4 and the second external heat exchanger 5. The two parts of the refrigerant finally merge 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 (such as Figure 3 As shown), the four-way reversing valve 6 controls the refrigerant in the loop system to flow from the compressor 1 to 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, and the internal heat exchanger 2 releases heat, allowing the indoor air to absorb heat. Then the refrigerant flows into the first expansion valve 7 and the second expansion valve 8 respectively to reduce pressure and vaporize, and reduce the temperature. A part of the refrigerant flows into the solar collector 3 through the second expansion valve 8 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, and the other part of the refrigerant flows into the first external heat exchanger 4 through the first expansion valve 7. Since the temperature and heat of the refrigerant passing through the solar collector 3 for heat exchange are increased, the flow The temperature of the refrigerant in the second external heat exchanger 5 is greater than the outdoor environment. At this time, the second external heat exchanger 5 is in a heat release state, and the frost on the outside of the second external heat exchanger 5 is defrosted. At the same time, the heat is transferred through the fins 12 to the first heat exchanger 4 and the first heat exchanger 4 is defrosted. The excess heat will also be 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 is combined through the first heat exchanger 4 and the second external heat exchanger 5 and flows back into the compressor 1 to complete the heating cycle and defrosting operation.

[0054] 3. When using internal heat exchanger 2 for cooling (such as Figure 4 As shown in the figure, the refrigerant in the four-way reversing valve 6 controls the refrigerant in the loop system to flow from the compressor 1 to 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 a closed state, the refrigerant cannot flow through the solar collector 3, and the third solenoid valve 11 is in an 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 to become a low-temperature and high-pressure refrigerant liquid. The two refrigerant liquids finally converge and are reduced in pressure through the first expansion valve 7 to become 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 to become 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 method of the compressor 1 and the expansion valve is the same as that of the compressor and expansion valve of the traditional air conditioner, and both are installed in the indoor unit of the air conditioner; the solar collector 3 is installed on a building or ground with good outdoor lighting; the installation method of the first external heat exchanger 4, the second external heat exchanger 5, and the four-way reversing valve 6 is the same as that of the heat exchanger four-way reversing valve of the traditional air conditioner, and both are 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 structure belongs to the existing conventional technology, and its specific installation method is adaptive installation, and the detailed setting method is not repeated here.

[0057] Furthermore, since the outdoor frost conditions are: 1. The outdoor surface temperature drops to zero degrees; 2. The air moisture content reaches 100%. Therefore, a temperature and humidity detector can be set in the outdoor unit to detect whether the outdoor temperature and humidity have reached the frost conditions. The temperature and humidity detector is electrically connected to the air conditioner controller of the air conditioner indoor unit. If the frost conditions are reached, the temperature and humidity detector will form an electrical signal to transmit the defrost command to the air conditioner controller, and the control loop system becomes as follows: Figure 3 Defrost in the cycle state shown.

[0058] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. An air conditioning heat exchange system combining solar energy and air thermal energy, characterized in that: The compressor (1) comprises an internal heat exchanger (2) and a first external heat exchanger (4) which are connected in series in sequence through a four-way reversing valve (6) and a pipeline to form a loop; It also includes a second external heat exchanger (5) connected in parallel with the first external heat exchanger (4), wherein the second external heat exchanger (5) is close to the first external heat exchanger (4); It also includes a solar thermal collector (3), wherein the solar thermal 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), 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), a third solenoid valve (11) is provided on the pipeline connected between the expansion valve and the second external heat exchanger (5), and 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 via a pipeline and a second solenoid valve (10).

2. The air conditioning heat exchange system combining solar energy and air thermal energy according to claim 1, characterized in that: The first external heat exchanger (4) and the second external heat exchanger (5) both use coiled heat exchange tubes, and the two coiled heat exchange tubes are staggered and fitted up and down.

3. The air conditioning heat exchange system combining solar energy and air thermal energy according to claim 2, characterized in that: Fins (12) are provided on the outer sides of the first external heat exchanger (4) and the second external heat exchanger (5).

4. The air conditioning heat exchange system combining solar energy and air thermal energy according to claim 1, characterized in that: Two expansion valves are used, one expansion valve is arranged 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).

5. The air conditioning heat exchange system combining solar energy and air thermal energy according to claim 1, characterized in that: The expansion valve is a single one, one end of which is connected to the internal heat exchanger (2) through a pipeline, and the other end of which is connected to the solar collector (3), the first external heat exchanger (4) and the second external heat exchanger (5) through pipelines.

6. The air conditioning heat exchange system combining solar energy and air thermal energy according to claim 1, characterized in that: The circulation pipelines of the solar thermal collector (3), the first external heat exchanger (4) and the second external heat exchanger (5) are all provided with expansion valves.

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