Coupling heat exchange system

Abstract

The invention discloses a coupling heat exchange system which comprises a heat exchanger. A water heater; a water outlet of the water heater communicates with an inlet of the user side, and an outlet of the user side and a water return port of the water heater are connected with the primary side of the heat exchanger to form a water circulation loop; an air source heat pump; the air source heat pump comprises a compressor, a condenser and an evaporator which are communicated in sequence; an outlet of the compressor and an inlet of the condenser are both connected with the secondary side of the heat exchanger to form a refrigerant circulation loop. The water heater and the air source heat pump are coupled through the heat exchanger, heat exchange is conducted on refrigerants in the refrigerant circulation loop in advance through low-temperature water flowing back to the water heater, the temperature of the refrigerants entering the condenser is reduced, meanwhile, heat exchange can be conducted on water in the water circulation loop through high-temperature refrigerants flowing out of the compressor, and the heat exchange efficiency is improved. Therefore, energy of the air source heat pump is utilized while the refrigeration efficiency of the air source heat pump is improved, and the energy consumption of the water heater is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of heat exchange systems, and in particular to a coupled heat exchange system. Background Art

[0002] When most users need cooling, heating and domestic hot water, traditional technology uses water heaters to provide domestic hot water, and air source heat pumps to provide cooling and heating. In the prior art, air source heat pumps include compressors, condensers and evaporators. The refrigerant flows out of the compressor and enters the condenser and then the evaporator to perform cooling. When the air source heat pump is cooling, the unit dissipates heat through the condenser and the fan. The heat needs to consume electrical power to dissipate, and no energy is utilized, which also increases energy consumption. The main source of heat preservation for water heaters is the consumption of energy to supply energy to the water heater (especially in zero cold water mode), resulting in very high energy consumption.

[0003] Therefore, the prior art still needs to be improved and developed. Summary of the invention

[0004] The technical problem to be solved by the present application is to provide a coupled heat exchange system in view of the above-mentioned defects of the prior art, aiming to improve the cooling efficiency of the air source heat pump while utilizing the energy of the air source heat pump to reduce the energy consumption of the water heater.

[0005] The technical solutions adopted by this application to solve the technical problems are as follows:

[0006] A coupled heat exchange system, comprising:

[0007] Heat exchanger;

[0008] A water heater; the water outlet of the water heater is connected to the inlet of the user end, and the outlet of the user end and the water return port of the water heater are both connected to the primary side of the heat exchanger to form a water circulation loop;

[0009] Air source heat pump; the air source heat pump comprises a compressor, a condenser and an evaporator connected in sequence; the outlet of the compressor and the inlet of the condenser are both connected to the secondary side of the heat exchanger to form a refrigerant circulation loop.

[0010] The coupled heat exchange system, wherein the heat exchanger is a shell-and-tube heat exchanger.

[0011] The coupled heat exchange system further comprises:

[0012] Three-way valve; the inlet valve of the three-way valve is connected to the outlet of the user end, the first outlet valve of the three-way valve is connected to the primary side of the heat exchanger, and the second outlet valve of the three-way valve is connected to the return water port of the water heater.

[0013] The coupled heat exchange system further comprises:

[0014] The water pump is arranged between the inlet valve of the three-way valve and the outlet at the user end.

[0015] The coupled heat exchange system, wherein the air source heat pump further comprises:

[0016] A four-way valve located in the refrigerant circulation loop;

[0017] The four-way valve is arranged between the inlet of the condenser and the heat exchanger, and is connected to the reflux port of the compressor and the evaporator respectively.

[0018] The coupled heat exchange system further comprises:

[0019] The auxiliary temperature regulating device is located indoors and is arranged on the secondary side of the evaporator.

[0020] The coupled heat exchange system, wherein the auxiliary temperature adjustment device comprises:

[0021] A storage box; the storage box is provided with an air inlet and an air outlet;

[0022] The coil has two ends connected to the secondary side of the evaporator to form a circulation loop;

[0023] At least one first fan is disposed in the receiving box and arranged upstream of the coil along the airflow direction in the receiving box.

[0024] The coupled heat exchange system, wherein the auxiliary temperature adjustment device further comprises:

[0025] A filter screen is arranged at the air inlet;

[0026] The water receiving tray is arranged in the receiving box and is located below the coil.

[0027] The coupled heat exchange system, wherein the air source heat pump further comprises:

[0028] At least one second fan is arranged on one side of the condenser.

[0029] The coupled heat exchange system, wherein the water heater is a gas water heater or an electric water heater.

[0030] Beneficial effect: In the present application, the water heater and the air source heat pump are coupled through the heat exchanger, so that the refrigerant in the refrigerant circulation loop is pre-heated by the low-temperature water returning to the water heater, thereby reducing the temperature of the refrigerant entering the condenser, thereby reducing the burden on the condenser. There is no need to reduce the refrigerant from an extremely high temperature to the condensation temperature, thereby reducing the workload of the condenser. The condenser can complete the cooling and condensation process more efficiently, reducing or even avoiding scaling and material fatigue of the condenser, thereby achieving the purpose of improving the refrigeration efficiency of the air source heat pump.

[0031] At the same time, in the refrigerant circulation loop, the high-temperature refrigerant flowing out of the compressor can exchange heat with the water in the water circulation loop, so that the water is preheated before flowing back to the water heater. When the water heater heats the water, the basic temperature of the water is increased, thereby improving the working efficiency of the water heater and reducing the energy consumption of the water heater. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 is a schematic diagram of the structure of the coupled heat exchange system described in this application;

[0033] Figure 2 It is a structural schematic diagram of the auxiliary temperature control equipment described in this application. DETAILED DESCRIPTION

[0034] It will be understood by those skilled in the art that, unless expressly stated, the singular forms "one", "said", and "the" used herein may also include plural forms. It should be further understood that the term "comprising" used in the specification of the present application refers to the presence of the features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof. It should be understood that when we refer to an element as being "connected" or "coupled" to another element, it may be directly connected or coupled to the other element, or there may be an intermediate element. In addition, the "connection" or "coupling" used herein may include wireless connection or wireless coupling. The term "and / or" used herein includes all or any unit and all combinations of one or more associated listed items.

[0035] It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as those generally understood by those skilled in the art to which this application belongs. It should also be understood that terms such as those defined in general dictionaries should be understood to have meanings consistent with those in the context of the prior art, and will not be interpreted with idealized or overly formal meanings unless specifically defined as here.

[0036] The present application provides a coupled heat exchange system, such as Figure 1 As shown, the coupled heat exchange system includes a heat exchanger 1, a water heater 2 and an air source heat pump 3; the water outlet of the water heater 2 is connected to the inlet of the user end 10, and the outlet of the user end 10 and the return water outlet of the water heater 2 are both connected to the primary side of the heat exchanger 1 to form a water circulation loop 100; the air source heat pump 3 includes a compressor 31, a condenser 32 and an evaporator 33 connected in sequence; the outlet of the compressor 31 and the inlet of the condenser 32 are both connected to the secondary side of the heat exchanger 1 to form a refrigerant circulation loop 200.

[0037] The water heater 2 and the air source heat pump 3 are coupled via the heat exchanger 1, so that the refrigerant in the refrigerant circulation loop 200 is pre-heated by the low-temperature water returning to the water heater 2, thereby reducing the temperature of the refrigerant entering the condenser 32, thereby reducing the burden on the condenser 32. There is no need to reduce the refrigerant from an extremely high temperature to the condensation temperature, thereby reducing the workload of the condenser 32. The condenser 32 can complete the cooling and condensation process more efficiently, reducing or even avoiding scaling and material fatigue of the condenser 32, thereby achieving the purpose of improving the refrigeration efficiency of the air source heat pump 3.

[0038] At the same time, in the refrigerant circulation loop 200, the high-temperature refrigerant flowing out from the compressor 31 can exchange heat with the water in the water circulation loop 100, so that the water is preheated before returning to the water heater 2. When the water heater 2 heats the water, the basic temperature of the water is increased, thereby improving the working efficiency of the water heater 2 and reducing the energy consumption of the water heater 2.

[0039] Specifically, the primary side of the heat exchanger 1 constitutes the water circulation loop 100, and the secondary side of the heat exchanger 1 constitutes the refrigerant circulation loop 200. In the water circulation loop 100, the water outlet of the water heater 2 is connected to the inlet of the user end 10, the outlet of the user end 10 is connected to the inlet of the primary side of the heat exchanger 1, and the outlet of the primary side of the heat exchanger 1 is connected to the return water port of the water heater 2; that is, the water discharged from the outlet of the user end 10 flows back into the water heater 2 after passing through the heat exchanger 1, thereby exchanging heat with the secondary side of the heat exchanger 1.

[0040] In the refrigerant circulation loop 200, the outlet of the compressor 31 is connected to the inlet of the secondary side of the heat exchanger 1, the outlet of the secondary side of the heat exchanger 1 is connected to the inlet of the condenser 32, the outlet of the condenser 32 is connected to the inlet of the evaporator 33, and the outlet of the evaporator 33 is connected to the reflux port of the compressor 31; then, the high-temperature refrigerant flowing out of the compressor 31 can be heat exchanged with the water circulation loop 100 on the primary side of the heat exchanger 1 in the heat exchanger 1, and after being pre-cooled, it flows into the condenser 32 and then circulates in the air source heat pump 3.

[0041] The coupled heat exchange system also includes a three-way valve 4; the inlet valve of the three-way valve 4 is connected to the outlet of the user end 10, the first outlet valve of the three-way valve 4 is connected to the primary side of the heat exchanger 1, and the second outlet valve of the three-way valve 4 is connected to the return water port of the water heater 2.

[0042] Specifically, the outlet of the primary side of the heat exchanger 1 is connected to the water return port of the water heater 2; the three-way valve 4 is used to control the connection between the outlet of the user end 10 and the inlet of the heat exchanger 1, and between the outlet of the user end 10 and the water return port of the water heater 2; then, when the inlet valve of the three-way valve 4 is connected to the first outlet valve, the outlet of the user end 10 is connected to the water return port of the water heater 2 through the primary side of the heat exchanger 1, so that the water that flows back after use at the user end 10 enters the water heater 2. The water heater 2 can be pre-heated with the refrigerant circulation circuit 200 through the heat exchanger 1 before use; when the inlet valve of the three-way valve 4 is connected to the second outlet valve, the connection line between the outlet of the user end 10 and the primary side of the heat exchanger 1 is cut off, and the outlet of the user end 10 is directly connected to the return water port of the water heater 2, so that the water that flows back after use through the user end 10 directly flows back into the water heater 2 without passing through the heat exchanger 1, and cannot be pre-heated with the refrigerant circulation circuit 200.

[0043] Therefore, when the temperature of the water flowing back after use at the user end 10 is high enough, and it is not necessary to exchange the heat of the water flowing back to the water heater 2 by the heat exchanger 1, the three-way valve 4 can be adjusted to connect the inlet valve with the second outlet valve, and to disconnect the inlet valve from the first outlet valve. When the temperature of the water flowing back after use at the user end 10 is low, the three-way valve 4 can be adjusted to connect the inlet valve with the first outlet valve, and to disconnect the inlet valve from the second outlet valve.

[0044] In one embodiment of the present application, the coupled heat exchange system further includes a water pump 5 , and the water pump 5 is disposed between the inlet valve of the three-way valve 4 and the outlet of the user end 10 .

[0045] Specifically, the water pump 5 is arranged upstream of the three-way valve 4 and downstream of the user end 10 along the water flow direction of the water circulation loop 100. The effective heat exchange of the heat exchanger 1 depends on the flow of the city water at the user end 10; if the water flow is insufficient, the heat exchange effect of the heat exchanger 1 will be greatly reduced. Therefore, by driving the water pump 5, the city water can maintain a stable flow rate, thereby ensuring that the heat can be smoothly transferred to the water use system. When the inlet valve is connected to the first outlet valve, the water pump 5 can also increase the water flow rate in the heat exchanger 1. The increase in the water flow rate helps to enhance the turbulence inside the heat exchanger 1, avoid uneven heat exchange caused by slow local water flow, and thus improve the heat exchange efficiency of the entire system.

[0046] At the same time, the water pump 5 can also help eliminate gas accumulation in the water circulation loop 100; specifically, in the water circulation loop 100, gas may cause water flow interruption or hinder water flow, and the water pump 5 can provide sufficient power to drive the water flow, overcome gas resistance, and ensure smooth fluid circulation of the heat exchanger 1 and the entire system.

[0047] In one embodiment of the present application, the air source heat pump 3 also includes a four-way valve 34; the four-way valve 34 is located in the refrigerant circulation loop 200; the four-way valve 34 is arranged between the inlet of the condenser 32 and the heat exchanger 1, and is respectively connected to the reflux port of the compressor 31 and the evaporator 33.

[0048] Specifically, the four valves of the four-way valve 34 are respectively connected to the return port of the compressor 31, the outlet of the secondary side of the heat exchanger 1, the evaporator 33 and the condenser 32, and are used to adjust the flow direction of the refrigerant in the refrigerant circulation circuit 200. When the refrigerant flows out of the compressor 31 and passes through the heat exchanger 1, under the conduction effect of the four-way valve 34, the refrigerant passes through the condenser 32 and the evaporator 33 in sequence, and then flows back to the compressor 31, then the air source heat pump 3 is used for cooling. Conversely, when the refrigerant flows out of the compressor 31, first passes through the evaporator 33, then passes through the condenser 32, and finally flows back to the compressor 31, then the air source heat pump 3 is used for heating.

[0049] The coupled heat exchange system further includes an auxiliary temperature control device 6, which is located indoors and arranged on the secondary side of the evaporator 33. Figure 1 and Figure 2As shown, the auxiliary temperature control device 6 includes a storage box 61, a coil 62 and at least one first fan 63; the storage box 61 is provided with an air inlet and an air outlet; both ends of the coil 62 are connected to the secondary side of the evaporator 33 to form a circulation loop; the first fan 63 is arranged in the storage box 61 and arranged upstream of the coil 62 along the airflow direction in the storage box 61.

[0050] Specifically, the refrigerant circulation loop 200 is located on the primary side of the evaporator 33, and the auxiliary temperature control device 6 is located on the secondary side of the evaporator 33. Then, the evaporator 33 can be used as a heat exchanger while being normally used for cooling the air source heat pump 3, so that the refrigerant in the refrigerant circulation loop 200 exchanges heat with the water circulating in the auxiliary temperature control device 6, thereby playing an auxiliary temperature control role in the room and improving the indoor cooling effect.

[0051] One end of the coil 62 is connected to the inlet of the secondary side of the evaporator 33, and the other end of the coil 62 is connected to the outlet of the secondary side of the evaporator 33. When the air source heat pump 3 is cooling, the evaporator 33 absorbs heat through the evaporation of the refrigerant to reduce the ambient temperature; through the connection between the secondary side of the evaporator 33 and the auxiliary temperature control device 6, the water on the secondary side of the evaporator 33 exchanges heat in the evaporator 33, and transfers the cold energy to the coil 62 to cool the coil 62. Therefore, when the first fan 63 is turned on, the fan accelerates the heat exchange rate between the indoor air and the coil 62 by forcing air flow. The indoor air passes through the low-temperature surface of the coil 62, so that the cold energy of the low-temperature coil 62 can be quickly transferred to the room, thereby quickly absorbing the heat of the indoor hot air, reducing the air temperature, and further improving the heat exchange efficiency.

[0052] In one embodiment of the present application, the auxiliary temperature control device 6 also includes a filter; the filter is arranged at the air inlet.

[0053] Since the water flowing in the coil 62 is water that has been cooled by heat exchange, condensed water is easily formed on the outer surface of the coil 62 after a long period of use; then, under the effect of the condensed water on the outer surface of the coil 62, if the dust and the like carried in the air in the storage box 61 are easily adhered to the outer surface of the coil 62, the heat exchange efficiency is reduced. Therefore, in this embodiment, the filter is set at the air inlet, and when the first fan 63 is turned on, the air will first be filtered by the filter before entering the storage box 61, reducing the accumulation of dust and other debris on the outer surface of the coil 62, thereby ensuring the heat exchange efficiency of the auxiliary temperature control device 6.

[0054] In one embodiment of the present application, Figure 2 As shown, the auxiliary temperature regulating device 6 further includes a water receiving tray 64 , which is disposed in the receiving box 61 and below the coil 62 .

[0055] Specifically, since the water flowing in the coil 62 is water that has undergone heat exchange and cooling, condensed water is likely to form on the outer surface of the coil 62 after a long period of use; therefore, the water receiving pan 64 is provided below the coil 62, and the water receiving pan 64 can receive the condensed water formed on the coil 62 to prevent the condensed water from accumulating directly in the storage box 61.

[0056] It is understandable that the storage box 61 has a replacement port that can be opened and closed, and the water receiving pan 64 can be taken out of the storage box 61 and cleaned by opening the replacement port. A drain pipe can also be inserted into the storage box 61, with one end of the drain pipe extending into the water receiving pan 64 and the other end extending to the outside, so as to discharge the condensed water in the water receiving pan 64.

[0057] In one embodiment of the present application, the air source heat pump 3 further includes at least one second fan 35 , and the second fan 35 is arranged on one side of the condenser 32 .

[0058] Specifically, the second fan 35 is arranged opposite to the condenser 32, so that the condenser 32 can be located in the air supply area of ​​the second fan 35. The second fan 35 accelerates the air flow through the heat sink of the condenser 32 by blowing air, and quickly takes away the heat released by the refrigerant, thereby cooling the refrigerant more effectively, shortening the time for the refrigerant in the refrigerant circulation loop 200 to condense in the condenser 32, and improving the condensation efficiency.

[0059] In one embodiment of the present application, the water heater 2 is a gas water heater 2 or an electric water heater 2, so that energy is provided to the water heater 2 by natural gas or city electricity.

[0060] In one embodiment of the present application, the heat exchanger 1 is a shell-and-tube heat exchanger; the shell-and-tube heat exchanger is used in the present application to exchange heat between the water circulation loop 100 and the refrigerant circulation loop 200, providing a larger contact area and higher heat exchange efficiency, which is conducive to the efficient transfer of heat between the air source heat pump 3 and the water heater 2. The shell-and-tube heat exchanger has a compact structure and a short heat conduction distance between the two fluids, which can effectively reduce heat loss during heat transfer; the shell-and-tube heat exchanger can also maintain the temperature stability of the hot water flow. Even if the temperature difference of the fluids on both sides is large, the shell-and-tube heat exchanger can control the speed of the fluid flow through its structure to ensure stable temperature output.

[0061] In summary, the present application provides a coupled heat exchange system, which includes: a heat exchanger; a water heater; the water outlet of the water heater is connected to the inlet of the user end, and the outlet of the user end and the return water outlet of the water heater are both connected to the primary side of the heat exchanger to form a water circulation loop; an air source heat pump; the air source heat pump includes a compressor, a condenser and an evaporator connected in sequence; the outlet of the compressor and the inlet of the condenser are both connected to the secondary side of the heat exchanger to form a refrigerant circulation loop. In the present application, the water heater and the air source heat pump are coupled through the heat exchanger, so that the refrigerant in the refrigerant circulation loop is pre-heated by the low-temperature water returning to the water heater, and the temperature of the refrigerant entering the condenser is reduced, so that the burden of the condenser is reduced, and the refrigerant does not need to be reduced from an extremely high temperature to a condensation temperature, reducing the workload of the condenser, so that the condenser can complete the cooling and condensation process more efficiently, reducing or even avoiding the phenomenon of scaling and material fatigue in the condenser, thereby achieving the purpose of improving the refrigeration efficiency of the air source heat pump. At the same time, in the refrigerant circulation loop, the high-temperature refrigerant flowing out of the compressor can exchange heat with the water in the water circulation loop, so that the water is preheated before flowing back to the water heater. When the water heater heats the water, the basic temperature of the water is increased, thereby improving the working efficiency of the water heater and reducing the energy consumption of the water heater.

[0062] It should be understood that the application of the present application is not limited to the above examples. For ordinary technicians in this field, improvements or changes can be made based on the above description. All these improvements and changes should fall within the scope of protection of the claims attached to this application.

Claims

1. A coupled heat exchange system, characterized in that: It includes: Heat exchanger; Water heater; The water outlet of the water heater is connected to the inlet of the user end, and the outlet of the user end and the water return port of the water heater are both connected to the primary side of the heat exchanger to form a water circulation loop; Air source heat pump; the air source heat pump comprises a compressor, a condenser and an evaporator connected in sequence; the outlet of the compressor and the inlet of the condenser are both connected to the secondary side of the heat exchanger to form a refrigerant circulation loop.

2. The coupled heat exchange system according to claim 1, characterized in that: The heat exchanger is a shell and tube heat exchanger.

3. The coupled heat exchange system according to claim 1, characterized in that: It also includes: Three-way valve; the inlet valve of the three-way valve is connected to the outlet of the user end, the first outlet valve of the three-way valve is connected to the primary side of the heat exchanger, and the second outlet valve of the three-way valve is connected to the return water port of the water heater.

4. The coupled heat exchange system according to claim 3, characterized in that: It also includes: The water pump is arranged between the inlet valve of the three-way valve and the outlet at the user end.

5. The coupled heat exchange system according to claim 1, characterized in that: The air source heat pump also includes: A four-way valve located in the refrigerant circulation loop; The four-way valve is arranged between the inlet of the condenser and the heat exchanger, and is connected to the reflux port of the compressor and the evaporator respectively.

6. The coupled heat exchange system according to claim 1, characterized in that: It also includes: The auxiliary temperature regulating device is located indoors and is arranged on the secondary side of the evaporator.

7. The coupled heat exchange system according to claim 6, characterized in that: The auxiliary temperature adjustment equipment comprises: A storage box; the storage box is provided with an air inlet and an air outlet; The coil has two ends connected to the secondary side of the evaporator to form a circulation loop; At least one first fan is disposed in the receiving box and arranged upstream of the coil along the airflow direction in the receiving box.

8. The coupled heat exchange system according to claim 7, characterized in that: The auxiliary temperature adjustment device also includes: A filter screen is arranged at the air inlet; The water receiving tray is arranged in the receiving box and is located below the coil.

9. The coupled heat exchange system according to claim 1, characterized in that: The air source heat pump also includes: At least one second fan is arranged on one side of the condenser.

10. The coupled heat exchange system according to claim 1, characterized in that: The water heater is a gas water heater or an electric water heater.

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