Heat exchange device and heat pump system

Abstract

The utility model relates to a heat exchange device and a heat pump system. The heat exchange device comprises a heat exchanger; a second switch piece is arranged on the first pipeline, and the two ends of the first pipeline are configured to be connected into a refrigerant pipeline so that the second switch piece can be connected with the first switch piece in parallel; the second pipeline is used for being connected with a waste heat recovery pipeline, and the waste heat recovery pipeline passes through external heat source equipment; the third pipeline is used for being connected with a hot water supply pipe, and the hot water supply pipe passes through the condenser; the bypass pipeline is used for being connected with a hot water supply pipe; the control valve is used for being connected with a water source, the third pipeline and the bypass pipeline are both connected with the control valve, and the control valve is used for communicating one of the third pipeline and the bypass pipeline with the water source; wherein the first pipeline, the second pipeline and the third pipeline pass through the heat exchanger. According to the heat exchange device, waste heat generated when the heat source equipment works can be recycled, and therefore the problem that the energy utilization efficiency of a heat pump system is reduced in the low-temperature environment is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of heat pump, in particular to a heat exchange device and a heat pump system. BACKGROUND

[0002] One of the applications of the heat pump system is to provide hot water for users, which can be used for heating or directly as domestic water. However, when the ambient temperature is low, the heat pump system taking air as a low-temperature heat source will face the problem of performance degradation, thereby leading to the decrease of energy utilization efficiency. Under the trend of energy saving and environmental protection, how to improve the energy utilization efficiency of the heat pump system is a problem to be studied. CONTENT OF THE INVENTION

[0003] The embodiment of the present application provides a heat exchange device and a heat pump system, which aims to improve the energy utilization efficiency of the heat pump system.

[0004] In a first aspect, the present application provides a heat exchange device for a heat pump system, wherein the heat pump system comprises an outdoor unit, the outdoor unit comprises a condenser, a refrigerant pipeline and a first switch, the refrigerant pipeline passes through the condenser, the first switch is arranged on the refrigerant pipeline, and the heat exchange device comprises:

[0005] a heat exchanger;

[0006] a first pipeline, wherein a second switch is arranged on the first pipeline, and two ends of the first pipeline are configured to be connected to the refrigerant pipeline, so that the second switch is connected in parallel with the first switch;

[0007] a second pipeline, wherein the second pipeline is used for connecting a waste heat recovery pipeline, and the waste heat recovery pipeline passes through an external heat source device;

[0008] a third pipeline, wherein the third pipeline is used for connecting a hot water supply pipeline, and the hot water supply pipeline passes through the condenser;

[0009] a bypass pipeline, wherein the bypass pipeline is used for connecting the hot water supply pipeline; and

[0010] a control valve, wherein the control valve is used for connecting a water source, the third pipeline and the bypass pipeline are connected to the control valve, and the control valve is used for connecting one of the third pipeline and the bypass pipeline to the water source;

[0011] wherein the first pipeline, the second pipeline and the third pipeline all pass through the heat exchanger.

[0012] The heat exchange device in the embodiment of the present application can connect the outdoor unit, the heat source device, the water source and the heat supply pipeline, thereby recycling the waste heat generated when the heat source device works. Since the first pipeline, the second pipeline and the third pipeline all pass through the heat exchanger, the recycled waste heat can be transmitted to the water in the third pipeline through the heat exchanger and / or to the refrigerant in the first pipeline through the heat exchanger, thereby effectively utilizing the recycled waste heat to improve the comprehensive energy utilization efficiency of the heat pump system, thereby improving the problem of the energy utilization efficiency of the heat pump system in a low-temperature environment.

[0013] In some embodiments, the heat exchange device further comprises a first temperature sensor and a second temperature sensor, the first temperature sensor is arranged at the inlet end of the second pipeline, and the second temperature sensor is arranged on the upstream side of the control valve.

[0014] In some embodiments, the outdoor unit further comprises a first throttling device, the first throttling device is arranged in the refrigerant pipeline; the heat exchange device further comprises a second throttling device, the second throttling device is arranged in the first pipeline, and the second throttling device is connected in parallel with the first throttling device.

[0015] In some embodiments, the heat exchange device further comprises a water pump, and the water pump is arranged in the second pipeline.

[0016] In some embodiments, the heat exchange device further comprises a box body, an accommodating cavity is arranged in the box body, and the heat exchanger, the first pipeline, the second pipeline, the third pipeline and the bypass pipeline are located in the accommodating cavity; a plurality of interfaces are arranged on the box body, and the first pipeline, the second pipeline and the control valve are in communication with a corresponding interface.

[0017] In some embodiments, the heat exchange device further comprises a three-way valve, the third pipeline and the bypass pipeline are connected with the three-way valve, and the three-way valve is in communication with a corresponding interface.

[0018] In a second aspect, the present application provides a heat pump system, which comprises:

[0019] an outdoor unit, the outdoor unit comprising a condenser, a refrigerant pipeline and a first switching member, the refrigerant pipeline passing through the condenser, and the first switching member being arranged in the refrigerant pipeline;

[0020] a heat source device;

[0021] The heat exchange device in any of the above embodiments, two ends of the first pipeline are connected to the refrigerant pipeline, so that the second switch is connected in parallel with the first switch, the second pipeline is connected to a waste heat recovery pipeline, the waste heat recovery pipeline passes through the heat source device, the control valve is connected to a water source, the third pipeline and the bypass pipeline are both connected to a hot water supply pipeline, and the hot water supply pipeline passes through the condenser.

[0022] The heat pump system in the embodiments of the present application connects the outdoor unit, the heat source device, the water source and the heat supply pipeline through the heat exchange device, so as to recycle and utilize the waste heat generated by the heat source device during operation. The first pipeline, the second pipeline and the third pipeline in the heat exchange device all pass through the heat exchanger, so that the recycled waste heat can be transferred to the water in the third pipeline and / or the refrigerant in the first pipeline through the heat exchanger. Thus, the recycled waste heat can be effectively utilized to improve the comprehensive energy utilization efficiency of the heat pump system, thereby improving the problem of energy utilization efficiency reduction of the heat pump system in a low temperature environment.

[0023] In some embodiments, the outdoor unit further comprises a compressor, an evaporator and a first throttling device, and the compressor, the condenser, the first throttling device and the evaporator are connected in sequence through the refrigerant pipeline to form a refrigerant circulation loop.

[0024] In some embodiments, the heat pump system has a first mode, a second mode, a third mode and a fourth mode.

[0025] When the heat pump system is in the first mode, the third pipeline is connected to the water source, the first switch is opened, and the second switch is closed.

[0026] When the heat pump system is in the second mode, the third pipeline is connected to the water source, the first switch is closed, and the second switch is opened.

[0027] When the heat pump system is in the third mode, the bypass pipeline is connected to the water source, the first switch is opened, and the second switch is closed.

[0028] When the heat pump system is in the fourth mode, the bypass pipeline is connected to the water source, the first switch is closed, and the second switch is opened.

[0029] In some embodiments, the heat pump system comprises a controller, and the first switch, the second switch and the control valve are electrically connected to the controller.

[0030] The controller is configured to cause the heat pump system to be in a first mode, a second mode, a third mode or a fourth mode according to a size relationship of the first temperature, the second temperature and the third temperature.

[0031] The first temperature is a medium temperature at an inlet of the second pipeline, the second temperature is a water temperature on an upstream side of the control valve, and the third temperature is a refrigerant temperature on an upstream side of the first switch and the second switch.

[0032] In some embodiments, the controller is configured to:

[0033] cause the heat pump system to be in the first mode when the first temperature is greater than the second temperature and the first temperature is less than the third temperature;

[0034] cause the heat pump system to be in the second mode when the first temperature is greater than the second temperature and the first temperature is greater than the third temperature;

[0035] cause the heat pump system to be in the third mode when the first temperature is less than the second temperature and the first temperature is less than the third temperature;

[0036] cause the heat pump system to be in the fourth mode when the first temperature is less than the second temperature and the first temperature is greater than the third temperature.

[0037] In some embodiments, the heat source device is a photovoltaic-thermal device, a boiler device, a geothermal power generation device or a coking device. BRIEF DESCRIPTION OF DRAWINGS

[0038] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort on the basis of these drawings.

[0039] Figure 1 A structural schematic diagram of a heat exchange device according to an embodiment of the present application is shown in the figure.

[0040] Figure 2 A structural schematic diagram of a heat pump system according to an embodiment of the present application is shown in the figure.

[0041] Explanation of reference signs:

[0042] 10, heat pump system;

[0043] 100, outdoor unit; 101, condenser; 102, refrigerant pipeline; 103, first switch; 104, first throttling device; 105, compressor; 106, evaporator;

[0044] 200, heat exchange device; 201, heat exchanger; 202, first pipeline; 203, second pipeline; 204, third pipeline; 205, bypass pipeline; 206, control valve; 207, first temperature sensor; 208, second temperature sensor; 209, second throttling device; 210, water pump; 211, second switch;

[0045] 300, hot water supply pipeline;

[0046] 400, waste heat recovery pipeline. DETAILED DESCRIPTION

[0047] The principles and features of the present application are described below in conjunction with the accompanying drawings, and the examples are only used to explain the present application and not to limit the scope of the present application.

[0048] One of the applications of the heat pump system is to provide hot water for users, which can be used for heating or directly as domestic water. However, when the ambient temperature is low, the heat pump system taking air as a low-temperature heat source will face the problem of performance degradation, thereby leading to a decrease in energy utilization efficiency. Under the trend of developing energy-saving and environment-friendly, it is necessary to study how to improve the energy utilization efficiency of the heat pump system.

[0049] Based on the above situation, the embodiment of the first aspect of the present application provides a heat exchange device, which aims to improve the energy utilization efficiency of the heat pump system.

[0050] As shown in Figure 1 , Figure 2 The heat exchange device 200 in the embodiment of the present application is used in the heat pump system 10, and the heat pump system 10 includes an outdoor unit 100, the outdoor unit 100 includes a condenser 101, a refrigerant pipeline 102 and a first switch 103, the refrigerant pipeline 102 passes through the condenser 101, and the first switch 103 is arranged on the refrigerant pipeline 102.

[0051] The heat exchange device 200 comprises a heat exchanger 201, a first pipeline 202, a second pipeline 203, a third pipeline 204, a bypass pipeline 205, and a control valve 206. Specifically, the second switch 211 is arranged on the first pipeline 202, and the two ends of the first pipeline 202 are configured to be connected to the refrigerant pipeline 102, so that the second switch 211 is connected in parallel with the first switch 103. The second pipeline 203 is used to connect the waste heat recovery pipeline 400, and the waste heat recovery pipeline 400 passes through an external heat source device. The third pipeline 204 is used to connect the hot water supply pipeline 300, and the hot water supply pipeline 300 passes through the condenser 101. The bypass pipeline 205 is used to connect the hot water supply pipeline 300. The control valve 206 is used to connect a water source, and the third pipeline 204 and the bypass pipeline 205 are both connected to the control valve 206, and the control valve 206 is used to make one of the third pipeline 204 and the bypass pipeline 205 conductive to the water source. The first pipeline 202, the second pipeline 203, and the third pipeline 204 all pass through the heat exchanger 201.

[0052] Specifically, the external heat source device is a device capable of generating heat, and the waste heat recovery pipeline 400 is provided with a flowing medium, such as water or other refrigerants. The waste heat recovery pipeline 400 passes through the heat source device, so that the water in the pipeline can absorb the waste heat of the heat source device. Here, the "waste heat" refers to the heat generated by the heat source device when it is working but not effectively utilized. The second pipeline 203 is connected to the waste heat recovery pipeline 400, so that the waste heat generated by the heat source device when it is working can be introduced into the heat exchanger 201.

[0053] The water source provides water for the heat supply pipeline. The water source can be tap water or other water storage devices, such as a water tank. In the case where the water source is a water storage device and the heated water is used for heating, a backwater pipeline can be further connected between the heating device and the water storage device to guide the used water back to the water storage device.

[0054] The outdoor unit 100 further comprises a compressor 105 and an evaporator 106, and the refrigerant pipeline 102 further passes through the compressor 105 and the evaporator 106. When the outdoor unit 100 is working, the refrigerant circulates in the refrigerant pipeline 102. When the refrigerant passes through the evaporator 106, the evaporator 106 absorbs heat from the air. When the refrigerant passes through the condenser 101, the condenser 101 releases heat. Since the heat supply pipeline passes through the condenser 101 of the outdoor unit 100, the heat released by the condenser 101 is used to heat the water in the heat supply pipeline.

[0055] The control valve 206 is used to selectively make one of the third pipeline 204 and the bypass pipeline 205 conductive to the water source. When the third pipeline 204 is conductive, the water source supplies water to the hot water supply pipeline 300 through the third pipeline 204. When the bypass pipeline 205 is conductive, the water source supplies water to the hot water supply pipeline 300 through the bypass pipeline 205.

[0056] The first switch 103 and the second switch 211 can be switch valves. The first switch 103 can be arranged at the downstream side of the condenser 101, i.e., the refrigerant passes through the first switch 103 after releasing heat in the condenser 101. The second switch 211 is arranged in the first pipeline 202. By controlling the states of the first switch 103 and the second switch 211, the refrigerant can be selectively allowed to pass through or not to pass through the first pipeline 202. For example, when the first switch 103 is open and the second switch 211 is closed, the refrigerant does not pass through the first pipeline 202; when the first switch 103 is closed and the second switch 211 is open, the refrigerant passes through the first pipeline 202.

[0057] The heat exchange device 200 in the embodiment of the present application can connect the outdoor unit 100, the heat source device, the water source, and the heat supply pipeline, thereby recycling the waste heat generated when the heat source device is working. Since the first pipeline 202, the second pipeline 203, and the third pipeline 204 all pass through the heat exchanger 201, the recycled waste heat can be transferred to the water in the third pipeline 204 through the heat exchanger 201 and / or to the refrigerant in the first pipeline 202 through the heat exchanger 201. Thus, the recycled waste heat can be effectively utilized to improve the comprehensive energy utilization efficiency of the heat pump system 10, thereby improving the problem of the decrease in the energy utilization efficiency of the heat pump system 10 in a low-temperature environment.

[0058] In some embodiments, the heat exchange device 200 further includes a first temperature sensor 207 and a second temperature sensor 208. The first temperature sensor 207 is arranged at the inlet end of the second pipeline 203, and is used to obtain the temperature of the medium (e.g., the water temperature) at the inlet position of the second pipeline 203. The second temperature sensor 208 is arranged at the upstream side of the control valve 206, and is used to obtain the water temperature at the upstream side of the control valve 206.

[0059] In this way, the working state of the heat exchange device 200 can be regulated according to the measurement results of the first temperature sensor 207 and the second temperature sensor 208. Specifically, when the temperature of the medium at the inlet position of the second pipeline 203 is greater than the water temperature at the upstream side of the control valve 206, the control valve 206 allows the third pipeline 204 to be conducted, so that the recycled waste heat is transferred to the water in the third pipeline 204. When the temperature of the medium at the inlet position of the second pipeline 203 is less than the water temperature at the upstream side of the control valve 206, the control valve 206 allows the bypass pipeline 205 to be conducted (at this time, the third pipeline 204 is disconnected), so that the medium in the second pipeline 203 avoids absorbing heat from the water in the third pipeline 204.

[0060] In some embodiments, the outdoor unit 100 further comprises a first throttling device 104, which is arranged in the refrigerant pipeline 102. The heat exchange device 200 further comprises a second throttling device 209, which is arranged in the first pipeline 202 and is connected in parallel with the first throttling device 104. The first throttling device 104 is arranged on the downstream side of the first switching member 103, i.e. the refrigerant passes through the first throttling device 104 after passing through the first switching member 103.

[0061] Exemplarily, the first throttling device 104 and the second throttling device 209 can be expansion valves or capillary tubes, etc.

[0062] When the first switching member 103 is open and the second switching member 211 is closed, the refrigerant passes through the first throttling device 104; when the first switching member 103 is closed and the second switching member 211 is open, the refrigerant passes through the first pipeline 202 and the second throttling device 209 arranged on the first pipeline 202. In this way, the refrigerant will pass through a throttling device no matter which line is selected, so as to ensure the normal circulation of the refrigerant.

[0063] In some embodiments, the heat exchange device 200 further comprises a water pump 210, which is arranged in the second pipeline 203. The water pump 210 is used for pressurization, so as to ensure the flow of the medium in the circulation loop formed by the second pipeline 203 and the waste heat recovery pipeline 400.

[0064] In some embodiments, the heat exchange device 200 further comprises a box (not shown in the figure), which has an accommodating cavity in the interior. The heat exchanger 201, the first pipeline 202, the second pipeline 203, the third pipeline 204 and the bypass pipeline 205 are located in the accommodating cavity. The box is provided with a plurality of interfaces (not shown in the figure), and the first pipeline 202, the second pipeline 203 and the control valve 206 are in communication with corresponding interfaces.

[0065] The heat exchanger 201, the first pipeline 202, the second pipeline 203, the third pipeline 204 and the bypass pipeline 205 are arranged in the accommodating cavity of the box. Therefore, the box can protect the heat exchanger 201 and the pipelines, so as to facilitate the stability of the heat exchange device 200. In addition, the structures in the heat exchange device 200 are integrated, which facilitates the transportation and transfer of the heat exchange device 200. When the heat exchange device 200 is applied to the heat pump system 10, the connection between the heat exchange device 200 and the outdoor unit 100, the heat source equipment, etc. can be realized through the interfaces, and the connection process is also convenient.

[0066] In one of the embodiments, the heat exchange device 200 further comprises a three-way valve (not shown in the figure), the third pipeline 204 and the bypass pipeline 205 are connected with the three-way valve, and the three-way valve is further connected with a corresponding interface. The third pipeline 204 and the bypass pipeline 205 can be connected with the same interface through the three-way valve, and on this basis, the hot water supply pipeline 300 is connected with the interface, so that the third pipeline 204, the bypass pipeline 205 and the hot water supply pipeline 300 are connected.

[0067] The embodiment of the second aspect of the application provides a heat pump system 10, which comprises an outdoor unit 100, a heat source device (not shown in the figure) and the heat exchange device 200 in any of the above embodiments. The outdoor unit 100 comprises a condenser 101, a refrigerant pipeline 102 and a first switching element 103, the refrigerant pipeline 102 passes through the condenser 101, and the first switching element 103 is arranged on the refrigerant pipeline 102. The two ends of the first pipeline 202 of the heat exchange device 200 are connected with the refrigerant pipeline 102, so that the second switching element 211 is connected in parallel with the first switching element 103, the second pipeline 203 is connected with the waste heat recovery pipeline 400, the waste heat recovery pipeline 400 passes through the heat source device, the control valve 206 is connected with a water source, the third pipeline 204 and the bypass pipeline 205 are both connected with the hot water supply pipeline 300, and the hot water supply pipeline 300 passes through the condenser 101.

[0068] The heat pump system 10 in the embodiment of the application connects the outdoor unit 100, the heat source device, the water source and the heat supply pipeline through the heat exchange device 200, so as to recycle and utilize the waste heat generated by the heat source device during operation. The first pipeline 202, the second pipeline 203 and the third pipeline 204 in the heat exchange device 200 all pass through the heat exchanger 201, so that the recycled waste heat can be transmitted to the water in the third pipeline 204 through the heat exchanger 201 and / or to the refrigerant in the first pipeline 202 through the heat exchanger 201. Thus, the recycled waste heat can be effectively utilized, so as to improve the comprehensive energy utilization efficiency of the heat pump system 10 and solve the problem of the decrease of the energy utilization efficiency of the heat pump system 10 in a low-temperature environment.

[0069] In some embodiments, the outdoor unit 100 further comprises a compressor 105, an evaporator 106 and a first throttling device 104, the compressor 105, the condenser 101, the first throttling device 104 and the evaporator 106 are connected in sequence through the refrigerant pipeline 102 to form a refrigerant circulation loop. In the process of refrigerant circulation, the refrigerant absorbs heat from air through the evaporator 106 when passing through the evaporator 106, and releases heat when passing through the condenser 101, wherein the heat released by the condenser 101 is used for heating water in the heat supply pipeline.

[0070] In some embodiments, the heat pump system 10 has a first mode, a second mode, a third mode and a fourth mode. When the heat pump system 10 is in the first mode, the third pipeline 204 is connected to the water source, the first switch 103 is opened, and the second switch 211 is closed; when the heat pump system 10 is in the second mode, the third pipeline 204 is connected to the water source, the first switch 103 is closed, and the second switch 211 is opened; when the heat pump system 10 is in the third mode, the bypass pipeline 205 is connected to the water source, the first switch 103 is opened, and the second switch 211 is closed; and when the heat pump system 10 is in the fourth mode, the bypass pipeline 205 is connected to the water source, the first switch 103 is closed, and the second switch 211 is opened.

[0071] When the heat pump system 10 is in the first mode, the water source is connected to the hot water supply pipe 300 through the third pipeline 204, and the refrigerant of the outdoor unit 100 does not pass through the first pipeline 202. In this case, the waste heat recovered by the waste heat recovery pipeline 400 from the heat source equipment can be transferred to the third pipeline 204 through the second pipeline 203 to preheat the water in the third pipeline 204, and the preheated water is further heated by the condenser 101. Thus, the overall heating efficiency of the water can be improved.

[0072] When the heat pump system 10 is in the second mode, the water source is connected to the hot water supply pipe 300 through the third pipeline 204, and the refrigerant of the outdoor unit 100 passes through the first pipeline 202. In this case, the waste heat recovered by the waste heat recovery pipeline 400 from the heat source equipment can be transferred to the first pipeline 202 and the third pipeline 204 through the second pipeline 203, that is, part of the waste heat is absorbed by the refrigerant in the first pipeline 202, and part of the waste heat is used to preheat the water in the third pipeline 204. In this way, on the one hand, the performance of the outdoor unit 100 in a low temperature environment can be improved, and on the other hand, the overall heating efficiency of the water can be improved.

[0073] When the heat pump system 10 is in the third mode, the water source is connected to the hot water supply pipe 300 through the bypass pipeline 205, and the water provided by the water source does not pass through the third pipeline 204, and the refrigerant of the outdoor unit 100 does not pass through the first pipeline 202. In this case, the medium in the second pipeline 203 does not exchange heat with the refrigerant and the water provided by the water source. It can be understood that in some cases, the temperature of the medium entering the second pipeline 203 can be low, for example, when the heat source equipment is not working or has low power, at this time, the third mode of the heat pump system 10 can be started.

[0074] In the fourth mode, the water source is communicated with the hot water supply pipe 300 through the bypass pipe 205, and the water provided by the water source does not pass through the third pipe 204, and the refrigerant of the outdoor unit 100 passes through the first pipe 202, in this case, the waste heat recovered by the waste heat recovery pipe 400 from the heat source equipment can be transmitted to the first pipe 202 through the second pipe 203, and the part of the waste heat is absorbed by the refrigerant in the first pipe 202, thereby the performance of the outdoor unit 100 in the low temperature environment can be compensated.

[0075] In one embodiment, the heat pump system 10 further comprises a controller (not shown in the figure), and the first switch 103, the second switch 211 and the control valve 206 are electrically connected with the controller. The controller is configured to control the heat pump system 10 to be in the first mode, the second mode, the third mode or the fourth mode according to the size relationship among a first temperature, a second temperature and a third temperature. The first temperature is the temperature of the medium at the inlet of the second pipe 203, the second temperature is the temperature of the water on the upstream side of the control valve 206, and the third temperature is the temperature of the refrigerant on the upstream side of the first switch 103 and the second switch 211.

[0076] It can be understood that the first temperature and the second temperature can be obtained by a first temperature sensor 207 and a second temperature sensor 208 respectively. The third temperature can be calculated by adding an empirical value to the temperature value measured by a third temperature sensor arranged at the condenser 101 or the evaporator 106.

[0077] In the embodiment, the mode of the heat pump system 10 is controlled according to the size relationship among the temperature of the medium at the inlet of the second pipe 203, the temperature of the water on the upstream side of the control valve 206, and the temperature of the refrigerant on the upstream side of the first switch 103 and the second switch 211, so that the heat pump system 10 can maintain a high energy utilization efficiency.

[0078] Specifically, the controller is configured to control the heat pump system 10 to be in the first mode when the first temperature is greater than the second temperature and the first temperature is less than the third temperature, to be in the second mode when the first temperature is greater than the second temperature and the first temperature is greater than the third temperature, to be in the third mode when the first temperature is less than the second temperature and the first temperature is less than the third temperature, and to be in the fourth mode when the first temperature is less than the second temperature and the first temperature is greater than the third temperature.

[0079] That is, in the case that the medium temperature at the inlet of the second pipeline 203 is higher than the water temperature on the upstream side of the control valve 206 and higher than the refrigerant temperature on the upstream side of the first switch 103 and the second switch 211, the heat pump system 10 is in the second mode, and the waste heat recovered by the waste heat recovery pipeline 400 is transferred to the first pipeline 202 and the third pipeline 204 by the second pipeline 203.

[0080] In the case that the medium temperature at the inlet of the second pipeline 203 is higher than the water temperature on the upstream side of the control valve 206 but lower than the refrigerant temperature on the upstream side of the first switch 103 and the second switch 211, the heat pump system 10 is in the first mode, and the waste heat recovered by the waste heat recovery pipeline 400 is transferred to the third pipeline 204 by the second pipeline 203 to preheat the water in the third pipeline 204. At this time, the refrigerant does not participate in the heat exchange in the heat exchanger 201 to avoid heat loss of the refrigerant in the heat exchanger 201.

[0081] In the case that the medium temperature at the inlet of the second pipeline 203 is lower than the water temperature on the upstream side of the control valve 206 but higher than the refrigerant temperature on the upstream side of the first switch 103 and the second switch 211, the heat pump system 10 is in the fourth mode, and the waste heat recovered by the waste heat recovery pipeline 400 is transferred to the first pipeline 202 by the second pipeline 203 to be absorbed by the refrigerant in the first pipeline 202.

[0082] In the case that the medium temperature at the inlet of the second pipeline 203 is lower than the water temperature on the upstream side of the control valve 206 and lower than the refrigerant temperature on the upstream side of the first switch 103 and the second switch 211, the heat pump system 10 is in the third mode, and the medium in the second pipeline 203 does not exchange heat with the refrigerant and the water provided by the water source. Thus, energy loss of the refrigerant and the water in the heat exchanger 201 is avoided.

[0083] In some embodiments, the heat source device is a photovoltaic-thermal device.

[0084] The photovoltaic-thermal device can include a photovoltaic panel and a heat collector. The waste heat recovery pipeline 400 passes through the heat collector, and the medium in the waste heat recovery pipeline 400 can take away the heat of the photovoltaic-thermal device when passing through the heat collector, thereby cooling the photovoltaic panel. Meanwhile, the part of the heat absorbed by the medium in the waste heat recovery pipeline 400 can be released to the first pipeline 202 and / or the third pipeline 204 in the heat exchanger 201, thereby utilizing the part of the heat.

[0085] In some other embodiments, the heat source device can also be a boiler device, a geothermal power generation device, or a coking device, etc. The waste heat recovery pipeline 400 can recover the waste heat generated by the boiler device or the geothermal power generation device during operation, or recover the heat of the high-temperature flue gas generated by the coking device during operation. Thus, the waste heat can be utilized.

[0086] In the description of the present application, it needs to be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the purpose of facilitating the description of the present application and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation to the present application.

[0087] In addition, the terms "first", "second", "third", etc. are only used for descriptive purpose, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second", etc. can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise explicitly specified and limited.

[0088] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integral; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through intermediate medium, or internal communication of two elements or interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0089] In the present application, unless otherwise explicitly specified and limited, the first feature "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "under" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0090] In the description of the specification, the description using the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" etc. means that the particular feature, structure, material or characteristic being described is included in at least one embodiment or example of the present application. The illustrative appearances of the above-mentioned terms in various places in the specification are not necessarily referred to the same embodiment or example. Moreover, the particular features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples. Furthermore, the terms "comprise", "comprising", "include", "including", "contain", "containing" or variations thereof are used inclusively and do not exclude the additional inclusion of unrecited features, structures, materials, or characteristics.

[0091] Although the embodiments of the present application have been shown and described above, it is understood that the above-described embodiments are exemplary and are not to be interpreted as limiting the present application, and ordinary skilled people in the art can make changes, modifications, replacements and variations to the above-described embodiments within the scope of the present application.

Claims

1. A heat exchange device for a heat pump system, the heat pump system including an outdoor unit, the outdoor unit including a condenser, a refrigerant line, and a first switching member, the refrigerant line passing through the condenser, the first switching member being provided to the refrigerant line, characterized in that, The heat exchange device comprises: a heat exchanger; a first pipeline, a second switch element being arranged on the first pipeline, and two ends of the first pipeline being configured to be connected to the refrigerant pipeline so that the second switch element is connected in parallel with the first switch element; a second pipeline, the second pipeline being used for connecting a waste heat recovery pipeline, and the waste heat recovery pipeline passing through an external heat source device; a third pipeline, the third pipeline being used for connecting a hot water supply pipeline, and the hot water supply pipeline passing through the condenser; a bypass pipeline, the bypass pipeline being used for connecting the hot water supply pipeline; and a control valve, the control valve being used for connecting a water source, the third pipeline and the bypass pipeline being connected to the control valve, and the control valve being used for connecting one of the third pipeline and the bypass pipeline to the water source; wherein the first pipeline, the second pipeline and the third pipeline all pass through the heat exchanger.

2. The heat exchange device according to claim 1, wherein The heat exchange device further comprises a first temperature sensor and a second temperature sensor, the first temperature sensor being arranged at an inlet end of the second pipeline, and the second temperature sensor being arranged at an upstream side of the control valve.

3. The heat exchange device according to claim 1, wherein The outdoor unit further comprises a first throttling device, and the first throttling device is arranged on the refrigerant pipeline. The heat exchange device further comprises a second throttling device, and the second throttling device is arranged on the first pipeline, and the second throttling device is connected in parallel with the first throttling device.

4. The heat exchange device according to claim 1, wherein The heat exchange device further comprises a water pump, and the water pump is arranged on the second pipeline.

5. The heat exchange device according to any one of claims 1 to 4, characterized in that, The heat exchange device further comprises a box body, an accommodating cavity being arranged in the box body, and the heat exchanger, the first pipeline, the second pipeline, the third pipeline and the bypass pipeline are all located in the accommodating cavity. A plurality of interfaces are arranged on the box body, and the first pipeline, the second pipeline and the control valve are all connected to a corresponding interface.

6. The heat exchange device according to claim 5, wherein The heat exchange device further comprises a three-way valve, the third pipeline and the bypass pipeline are both connected to the three-way valve, and the three-way valve is also connected to a corresponding interface.

7. A heat pump system, characterized by, The heat exchange device comprises: an outdoor unit, the outdoor unit comprising a condenser, a refrigerant pipeline and a first switch element, the refrigerant pipeline passing through the condenser, and the first switch element being arranged on the refrigerant pipeline; a heat source device; the heat exchange device according to any one of claims 1 to 6, two ends of the first pipeline being connected to the refrigerant pipeline so that the second switch element is connected in parallel with the first switch element, the second pipeline being connected to a waste heat recovery pipeline, the waste heat recovery pipeline passing through the heat source device, the control valve being connected to a water source, the third pipeline and the bypass pipeline both being connected to a hot water supply pipeline, and the hot water supply pipeline passing through the condenser.

8. The heat pump system of claim 7, wherein, The outdoor unit further comprises a compressor, an evaporator and a first throttling device, and the compressor, the condenser, the first throttling device and the evaporator are sequentially connected through the refrigerant pipeline to form a refrigerant circulation loop.

9. The heat pump system of claim 7, wherein, The heat pump system has a first mode, a second mode, a third mode and a fourth mode; when the heat pump system is in the first mode, the third pipeline is connected to the water source, the first switch element is opened, and the second switch element is closed. In the second mode, the third pipeline is connected to the water source, the first switch is closed, and the second switch is opened. In the third mode, the bypass pipeline is connected to the water source, the first switch is opened, and the second switch is closed. In the fourth mode, the bypass pipeline is connected to the water source, the first switch is closed, and the second switch is opened.

10. The heat pump system of claim 9, wherein, The heat pump system further comprises a controller, and the first switch, the second switch, and the control valve are electrically connected to the controller. The controller is configured to determine the first mode, the second mode, the third mode, or the fourth mode of the heat pump system according to the relationship among a first temperature, a second temperature, and a third temperature. The first temperature is the temperature of the medium at the inlet of the second pipeline, the second temperature is the temperature of the water upstream of the control valve, and the third temperature is the temperature of the refrigerant upstream of the first switch and the second switch.

11. The heat pump system of claim 10, wherein, The controller is configured to: In the case that the first temperature is greater than the second temperature and the first temperature is less than the third temperature, the heat pump system is in the first mode. In the case that the first temperature is greater than the second temperature and the first temperature is greater than the third temperature, the heat pump system is in the second mode. In the case that the first temperature is less than the second temperature and the first temperature is less than the third temperature, the heat pump system is in the third mode. In the case that the first temperature is less than the second temperature and the first temperature is greater than the third temperature, the heat pump system is in the fourth mode.

12. The heat pump system of claim 7, wherein, The heat source device is a photovoltaic-thermal device, a boiler device, a geothermal power generation device, or a coking device.

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