Pneumatic-electric complementary heat exchange system

Abstract

The utility model discloses a gas-electric complementary heat exchange system which comprises a gas furnace connected with a gas pipe network; the heat pump is connected with a mains supply pipe network; a user heat exchange space; a first heat exchanger; the primary side of the first heat exchanger is connected with the gas furnace, and the secondary side is connected with an inlet of the user heat exchange space and the heat pump. And an outlet of the user heat exchange space is connected with the heat pump, so that a water circulation loop is formed among the user heat exchange space, the heat pump and the secondary side of the first heat exchanger. According to the system, gas and electricity heat source complementation is achieved, a user heat exchange space can conduct heat exchange and heat supply through a heat pump and a gas furnace, and by reasonably dispatching the working time and power output of the gas furnace and the heat pump, for example, when the load of a mains supply pipe network is high, the gas furnace is preferentially used for heating, and the gas furnace serves as a main heat supply source; when the load of the commercial power pipe network is low, the heat pump is used, so that the dependence on the commercial power pipe network can be reduced, the pressure of the commercial power pipe network is prevented from being too large, and the power demand of the heat pump is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of heat exchange systems, in particular to a gas-electricity complementary heat exchange system. BACKGROUND

[0002] In the prior art, when heating the user heat exchange space, a heat pump is connected to the user heat exchange space to realize heat exchange of the user heat exchange space. The start of the heat pump needs to rely on the power grid, and the heat pump occupies a large amount of energy consumption when exchanging heat for the user heat exchange space, especially in winter heating, during the peak period of energy demand, which puts great pressure on power resources.

[0003] Therefore, the prior art still needs to be improved and developed. CONTENT OF THE INVENTION

[0004] The technical problem to be solved by the present application is to provide a gas-electricity complementary heat exchange system to reduce the power supply pressure.

[0005] The technical solution adopted by the present application to solve the technical problem is as follows:

[0006] A gas-electricity complementary heat exchange system comprises:

[0007] A gas furnace connected to a gas pipe network;

[0008] A heat pump connected to a power grid;

[0009] A user heat exchange space;

[0010] A first heat exchanger, a primary side of the first heat exchanger being connected to the gas furnace, a secondary side of the first heat exchanger being connected to an inlet of the user heat exchange space and the heat pump respectively, and an outlet of the user heat exchange space being connected to the heat pump to form a water circulation loop between the user heat exchange space, the heat pump and the secondary side of the first heat exchanger.

[0011] The gas-electricity complementary heat exchange system further comprises:

[0012] A user hot water end, the gas furnace being connected to the user hot water end and supplying hot water to the user hot water end;

[0013] A first three-way valve arranged between a water outlet of the gas furnace and the user hot water end and connected to an inlet of the primary side of the first heat exchanger, and an outlet of the primary side of the first heat exchanger being connected to a water return port of the gas furnace.

[0014] The gas-electricity complementary heat exchange system further comprises:

[0015] A flue gas discharge pipeline connected to a flue gas outlet of the gas furnace;

[0016] a second heat exchanger; a primary side of the second heat exchanger is connected with the backwater outlet of the gas furnace and the user hot water end respectively, and a secondary side of the second heat exchanger is connected with the flue gas discharge pipeline.

[0017] The gas-electricity complementary heat exchange system, wherein the user heat exchange space comprises:

[0018] an auxiliary cooling device; an inlet of the auxiliary cooling device is connected with the first heat exchanger and the heat pump respectively; and an outlet of the auxiliary cooling device is connected with the heat pump.

[0019] a floor heating device; an inlet of the floor heating device is connected with the first heat exchanger and the heat pump respectively; and an outlet of the floor heating device is connected with the heat pump.

[0020] The gas-electricity complementary heat exchange system further comprises:

[0021] a water inlet pipeline, one end of which is connected with the heat pump, and the other end of which is connected with the inlet of the auxiliary cooling device after passing through the secondary side of the first heat exchanger;

[0022] a water outlet pipeline, one end of which is connected with the outlet of the auxiliary cooling device, and the other end of which is connected with the heat pump;

[0023] a second three-way valve, which is arranged on the water inlet pipeline and located between the first heat exchanger and the auxiliary cooling device; the second three-way valve is further connected with the inlet of the floor heating device;

[0024] a third three-way valve, which is arranged on the water outlet pipeline and located between the auxiliary cooling device and the heat pump; the third three-way valve is further connected with the outlet of the floor heating device.

[0025] The gas-electricity complementary heat exchange system further comprises:

[0026] a water pump, which is arranged on the water outlet pipeline.

[0027] The gas-electricity complementary heat exchange system further comprises:

[0028] a water tank, which is arranged on the water outlet pipeline and located between the water pump and the third three-way valve.

[0029] The gas-electricity complementary heat exchange system, wherein the heat pump comprises:

[0030] a compressor, which is connected with the power grid pipeline;

[0031] a four-way valve;

[0032] an evaporator;

[0033] a throttling valve;

[0034] condenser;

[0035] The compressor, the four-way valve, the evaporator, the throttling valve and the condenser are sequentially connected in series and form a refrigerant circulation loop.

[0036] The gas-electricity complementary heat exchange system further comprises:

[0037] The third heat exchanger, one side of which is connected with the user hot water end and the second heat exchanger respectively, and the other side of which is connected with the compressor and the four-way valve respectively.

[0038] The gas-electricity complementary heat exchange system further comprises:

[0039] The fourth three-way valve is arranged between the third heat exchanger and the user hot water end, and is further connected with the second heat exchanger.

[0040] Beneficial effects: The gas-electricity complementary heat exchange system can realize the complementation of gas and electricity heat sources. The user heat exchange space can be heated by the heat pump and the gas furnace respectively. Through intelligent control, the working time and power output of the gas furnace and the heat pump can be reasonably scheduled. For example, when the load of the power grid is high, the gas furnace is used for heating as the main heat source, and when the load of the power grid is low, the heat pump is used. In this way, the dependence on the power grid can be reduced, the pressure of the power grid can be avoided to be too large, and the power demand of the heat pump can be reduced. BRIEF DESCRIPTION OF DRAWINGS

[0041] Figure 1 is a structural schematic diagram of the gas-electricity complementary heat exchange system in the application. DETAILED DESCRIPTION

[0042] Those skilled in the art can understand that, unless specifically stated, the singular forms "a", "an" and "the" used herein also include the plural forms. It should be further understood that the phrase "comprising" used in the specification of the application means that the features, integers, steps, operations, elements and / or components exist, 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 say that an element is "connected" or "coupled" to another element, it can be directly connected or coupled to the other element, or there can be an intermediate element. In addition, "connected" or "coupled" used herein can include wireless connection or wireless coupling. The phrase "and / or" used herein includes all or any single unit and all combinations of the associated listed items.

[0043] As will be understood by one of ordinary skill in the art, and unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art in the field of the application. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the specification and relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

[0044] The present application provides a gas-electricity complementary heat exchange system, as shown in the drawings, the gas-electricity complementary heat exchange system comprises a gas stove 1, a heat pump 2, a user heat exchange space 3 and a first heat exchanger 4; the gas stove 1 is connected with a gas pipe network 200, the heat pump 2 is connected with a power grid 100; the primary side of the first heat exchanger 4 is connected with the gas stove 1, the secondary side of the first heat exchanger 4 is connected with the inlet of the user heat exchange space 3 and the heat pump 2 respectively; the outlet of the user heat exchange space 3 is connected with the heat pump 2, so as to form a water circulation loop among the user heat exchange space 3, the heat pump 2 and the secondary side of the first heat exchanger 4. Figure 1

[0045] Specifically, the user heat exchange space 3 in the present application is not only connected with the heat pump 2, so as to directly exchange heat for the user heat exchange space 3 through the heat pump 2 under the driving of the power grid 100; but also connects the user heat exchange space 3 with the gas stove 1 through the first heat exchanger 4, so that the water flow path for the user heat exchange space 3 can exchange heat not only with the heat pump 2 but also with the hot water supplied by the gas stove 1, and the gas stove 1 exchanges heat for the user heat exchange space 3 under the driving of the gas pipe network 200, so as to realize the heating of the user heat exchange space 3.

[0046] It can be seen that the present application realizes the complementation of gas and electricity heat sources, the user heat exchange space 3 can exchange heat and be heated through the heat pump 2 and the gas stove 1 respectively, and through intelligent control, the working time and power output of the gas stove 1 and the heat pump 2 are reasonably scheduled, for example, the gas stove 1 is used for heating preferentially when the load of the power grid 100 is high, the gas stove 1 is used as the main heat source, and the heat pump 2 is used when the load of the power grid 100 is low; in this way, the dependence on the power grid 100 can be reduced, the pressure of the power grid 100 can be avoided to be too large, and the power demand of the heat pump 2 can be reduced.

[0047] ​The gas-electricity complementary heat exchange system further comprises a user hot water end 5 and a first three-way valve 6; the gas stove 1 is connected with the user hot water end 5 and supplies hot water for the user hot water end 5; the first three-way valve 6 is arranged between a water outlet of the gas stove 1 and the user hot water end 5 and is connected with an inlet of a primary side of the first heat exchanger 4; an outlet of the primary side of the first heat exchanger 4 is connected with a backwater outlet of the gas stove 1.

[0048] Specifically, the inlet of the first three-way valve 6 is connected with the water outlet of the gas stove 1, among two outlets (a first outlet and a second outlet) of the first three-way valve 6, the first outlet of the first three-way valve 6 is connected with the user hot water end 5, so as to deliver the hot water discharged by the gas stove 1 to the user hot water end 5 for use by the user; the second outlet of the first three-way valve 6 is connected with the inlet of the primary side of the first heat exchanger 4, so as to deliver the hot water discharged by the gas stove 1 to the first heat exchanger 4 and exchange heat with the user heat exchange space 3 through the first heat exchanger 4, to realize heating of the user heat exchange space 3.

[0049] When the first outlet of the first three-way valve 6 and the second outlet of the first three-way valve 6 are both opened, the gas stove 1 can supply hot water for the user hot water end 5 and heat the user heat exchange space 3 at the same time, so that the gas stove 1 becomes an auxiliary heat source, and through the heat exchange effect of the first heat exchanger 4, the gas stove 1 and the heat pump 2 can jointly meet the heat demand of the floor heating 32, to improve the reliability and flexibility of the heating system. This synchronous auxiliary heating mode is especially suitable for cold weather, if the heat pump 2 alone cannot efficiently heat the user heat exchange space 3, adding the first heat exchanger 4 and combining the gas stove 1 can reduce the load of the heat pump 2, thereby saving energy and prolonging the service life of the heat pump 2.

[0050] When the user heat exchange space 3 needs to perform a cooling mode or is heated by the heat pump 2 in an electric mode only, the second outlet of the first three-way valve 6 can be closed, the gas stove 1 no longer supplies hot water for heat exchange to the first heat exchanger 4, and the first heat exchanger 4 no longer plays a role in heat exchange.

[0051] In an embodiment of the present application, the gas-electricity complementary heat exchange system further comprises a flue gas discharge pipeline 7 and a second heat exchanger 8; the flue gas discharge pipeline 7 is connected with a flue gas outlet of the gas stove 1; a primary side of the second heat exchanger 8 is connected with the backwater outlet of the gas stove 1 and the user hot water end 5 respectively, and a secondary side of the second heat exchanger 8 is connected with the flue gas discharge pipeline 7.

[0052] Specifically, the inlet of the primary side of the second heat exchanger 8 is connected with the outlet of the user hot water end 5, and the outlet of the primary side of the second heat exchanger 8 is connected with the backwater outlet of the gas stove 1; the flue gas outlet of the gas stove 1 is connected with the flue gas discharge pipeline 7, and the flue gas discharge pipeline 7 is respectively connected with the inlet and outlet of the secondary side of the second heat exchanger 8, so that the flue gas discharged by the gas stove 1 can be discharged to the outdoor only after passing through the secondary side of the second heat exchanger 8. The water flowing back to the gas stove 1 after use of the user hot water end 5 first enters the second heat exchanger 8, and then is preheated by the flue gas discharged by the gas stove 1, and then flows back to the gas stove 1.

[0053] The gas stove 1 will generate high-temperature flue gas during combustion, and a large amount of heat energy will be wasted if the flue gas is directly discharged; by installing the second heat exchanger 8 at the flue gas outlet of the gas stove 1, the heat in the flue gas can be used to preheat the backwater of the user hot water end 5, thereby recovering part of the heat energy; because the backwater has been preheated by the second heat exchanger 8, the temperature of the backwater is higher than that of the backwater directly flowing back to the gas stove 1 from the user hot water end 5, so the heating time and gas consumption required by the gas stove 1 are reduced, thereby improving the thermal efficiency and saving gas.

[0054] After the second heat exchanger 8 recovers the heat of the flue gas, the discharge temperature of the flue gas is significantly reduced, which not only reduces energy waste, but also reduces heat pollution discharged into the atmosphere, meeting the needs of energy saving and environmental protection.

[0055] The user heat exchange space 3 includes an auxiliary cooling device 31 and a floor heating 32; the inlet of the auxiliary cooling device 31 is respectively connected with the first heat exchanger 4 and the heat pump 2; the outlet of the auxiliary cooling device 31 is connected with the heat pump 2; the inlet of the floor heating 32 is respectively connected with the first heat exchanger 4 and the heat pump 2; and the outlet of the floor heating 32 is connected with the heat pump 2.

[0056] Specifically, the auxiliary cooling device 31 is used for refrigeration cooling by the heat pump 2, and the floor heating 32 is used for heating by the heat pump 2 and / or the gas stove 1. The auxiliary cooling device 31 includes a receiving box 311, a coil pipe 312 and at least one fan 313, the receiving box 311 is provided with an air inlet and an air outlet, and the two ends of the coil pipe 312 are connected with the heat pump 2 and form a circulation loop. The fan 313 is arranged in the receiving box 311 and is arranged upstream of the coil pipe 312 along the airflow direction in the receiving box 311.

[0057] The coil 312 is in communication with the heat pump 2; when the heat pump 2 cools, the heat pump 2 transmits cold to the coil 312, and the coil 312 is cooled; therefore, when the fan 313 is turned on, the fan 313 forces air to flow, accelerates the heat exchange rate between air and the coil 312, and air passes through the surface of the low-temperature coil 312, so that the cold of the low-temperature coil 312 can be quickly transmitted, thereby quickly absorbing the heat of the surrounding hot air, reducing the temperature of the air, and further improving the heat exchange efficiency. When the floor heating 32 needs to be heated, the heat pump 2 selects the heating mode, and the heat pump 2 exchanges heat with the floor heating 32.

[0058] The heat pump 2 comprises a compressor 21, a four-way valve 22, an evaporator 23, a throttling valve 24, and a condenser 25; the compressor 21 is connected with the power grid 100; the compressor 21, the four-way valve 22, the evaporator 23, the throttling valve 24, and the condenser 25 are connected in series, and form a refrigerant circulation loop.

[0059] Specifically, the primary side of the condenser 25 is connected with the throttling valve 24 and the four-way valve 22 respectively, the inlet of the secondary side of the condenser 25 is connected with the outlet of the auxiliary cooling device 31 and the outlet of the floor heating 32 respectively, and the outlet of the secondary side of the condenser 25 is connected with the inlet of the secondary side of the first heat exchanger 4 respectively.

[0060] The coil 312 is in communication with the heat pump 2; when the user heat exchange space 3 needs to be cooled, the compressor 21 changes the flow direction of the refrigerant, the condenser 25 is used as an evaporator, and the condenser 25 is used as a heat exchanger, so that the refrigerant in the heat pump 2 exchanges heat with the water circulating in the auxiliary cooling device 31, thereby playing a role of auxiliary cooling for the user heat exchange space 3, and improving the cooling effect of the user heat exchange space 3. Specifically, when the heat pump 2 cools, the condenser 25 is used as an evaporator to absorb heat by evaporation of the refrigerant, thereby reducing the surrounding temperature; through the connection between the secondary side of the condenser 25 and the auxiliary cooling device 31, the water in the secondary side of the condenser 25 exchanges heat in the condenser 25, and transmits cold to the coil 312, thereby cooling the coil 312; therefore, when the fan 313 is turned on, the fan 313 forces air to flow, accelerates the heat exchange rate between air and the coil 312, and air passes through the surface of the low-temperature coil 312, so that the cold of the low-temperature coil 312 can be quickly transmitted, thereby quickly absorbing the heat of the surrounding hot air, reducing the temperature of the air, and further improving the heat exchange efficiency.

[0061] When the heat pump 2 is heating, the compressor 21 changes the flow direction of the refrigerant, and the condenser 25 is used as a condenser again; the condenser 25 exchanges heat with the floor heating 32, thereby achieving the heating of the floor heating 32.

[0062] The gas-electricity complementary heat exchange system further comprises a water inlet pipeline 9, a water outlet pipeline 10, a second three-way valve 11 and a third three-way valve 12; one end of the water inlet pipeline 9 is connected with the heat pump 2, and the other end of the water inlet pipeline 9 is connected with the inlet of the auxiliary cooling device 31 through the secondary side of the first heat exchanger 4; one end of the water outlet pipeline 10 is connected with the outlet of the auxiliary cooling device 31, and the other end of the water outlet pipeline 10 is connected with the heat pump 2; the second three-way valve 11 is arranged on the water inlet pipeline 9 and located between the first heat exchanger 4 and the auxiliary cooling device 31; the second three-way valve 11 is further connected with the inlet of the floor heating 32; the third three-way valve 12 is arranged on the water outlet pipeline 10 and located between the auxiliary cooling device 31 and the heat pump 2; the third three-way valve 12 is further connected with the outlet of the floor heating 32.

[0063] Specifically, the floor heating 32 forms a water circulation loop connected in parallel with the auxiliary cooling device 31 through the second three-way valve 11 and the third three-way valve 12; the inlet of the second three-way valve 11 is connected with the secondary side of the first heat exchanger 4, the first outlet of the second three-way valve 11 is connected with the auxiliary cooling device 31, and the second outlet of the second three-way valve 11 is connected with the inlet of the floor heating 32; the first inlet of the third three-way valve 12 is connected with the auxiliary cooling device 31, the second inlet of the third three-way valve 12 is connected with the floor heating 32, and the outlet of the third three-way valve 12 is in communication with the secondary side of the condenser 25.

[0064] When the heat pump 2 is cooling, the second outlet of the second three-way valve 11 and the first inlet of the third three-way valve 12 are closed, and the second outlet of the first three-way valve 6 is closed, so that the auxiliary cooling device 31 is only in communication with the secondary side of the condenser 25, thereby forming a water circulation loop and achieving the cooling of the auxiliary cooling device 31. When the gas-electricity mode is adopted, the second outlet of the first three-way valve 6, the second outlet of the second three-way valve 11 and the first inlet of the third three-way valve 12 are opened synchronously, and the first outlet of the second three-way valve 11 and the first inlet of the third three-way valve 12 are closed, so that the floor heating 32 exchanges heat with the heat pump 2 and the gas stove 1 at the same time, thereby achieving the heating of the floor heating 32.

[0065] In an embodiment of the present application, the gas-electricity complementary heat exchange system further comprises a water pump 13 arranged on the water outlet pipeline 10.

[0066] Specifically, the floor heating 32 is usually a large loop with large water flow resistance; the water pump 13 is arranged to ensure that the hot water of the floor heating 32 can quickly and effectively return to the heat pump 2, to ensure smooth water circulation in the floor heating 32, thereby improving the heating efficiency and ensuring that heat can be continuously transmitted to the end of the floor heating 32. At the same time, the stable water flow rate between the floor heating 32 and the heat pump 2 is crucial to the system energy efficiency. The water pump 13 can maintain a suitable water flow rate, thereby maximizing the heat exchange efficiency in the condenser 25 and avoiding insufficient heat exchange caused by too fast or too slow water flow, to improve the efficiency and energy saving effect of the overall system.

[0067] In addition, in winter, the water outlet from the floor heating 32 to the heat pump 2 may be at a low temperature, and without the help of the water pump 13, the water flow may not be smooth, and the return water temperature may be lower than the bearing range of the heat pump 2, affecting the performance and service life of the heat pump 2; therefore, the arrangement of the water pump 13 in the embodiment can ensure that the return water temperature is within the temperature range designed for the heat pump 2, which helps to protect the main body of the heat pump 2.

[0068] In an embodiment of the present embodiment, the air-electricity complementary heat exchange system further comprises a water tank 14, which is arranged on the water outlet pipeline 10 and located between the water pump 13 and the third three-way valve 12.

[0069] Specifically, along the water flow direction of the water outlet pipeline 10, the water tank 14 is located upstream of the water pump 13 and downstream of the third three-way valve 12. Arranging the water tank 14 upstream of the water pump 13 can ensure that the water pump 13 always has sufficient water source when starting, avoiding air suction or air suction phenomenon of the water pump 13; air suction can cause the water pump 13 to fail to work normally, and even can damage the water pump 13, while the water tank 14 can provide a constant water source for the water pump 13, avoiding the problem of air suction.

[0070] At the same time, the water tank 14 can store excess cold (in cooling mode) or heat (in heating mode), and store the excess cold or heat when the load demand is low, and provide supplement when the load demand increases. This heat storage or cold storage function reduces the operating pressure of the heat pump 2, so that the heat pump 2 operates under relatively stable load conditions, improving the overall efficiency and durability of the air-electricity complementary heat exchange system.

[0071] In addition, the water tank 14 can also cooperate with the water pump 13 to ensure the stability of the water flow pressure and flow rate of the secondary side of the condenser 25 to the floor heating 32 and the auxiliary cooling device 31. The water pump 13 at the downstream position of the water tank 14 can ensure that the water flow through the floor heating 32 and the auxiliary cooling device 31 is sufficient, thereby ensuring the uniformity and stability of the cooling and heating supply, avoiding the fluctuation of the cooling and heating supply caused by the instability of the pressure in the gas-electricity complementary heat exchange system. Moreover, in the case of extreme load period (such as power peak, extreme weather) or in the case of short-term shutdown of the heat pump 2 for maintenance, the hot water or cold water in the water tank 14 can temporarily guarantee the heating or cooling demand of the system, improve the reliability and safety of the gas-electricity complementary heat exchange system for heating and refrigeration, and avoid system interruption.

[0072] The gas-electricity complementary heat exchange system further comprises a third heat exchanger 15 and a fourth three-way valve 16. The primary side of the third heat exchanger 15 is connected with the user hot water end 5 and the second heat exchanger 8 respectively, and the secondary side of the third heat exchanger 15 is connected with the compressor 21 and the four-way valve 22 respectively. The fourth three-way valve 16 is arranged between the third heat exchanger 15 and the user hot water end 5. The fourth three-way valve 16 is also connected with the second heat exchanger 8.

[0073] Specifically, the inlet of the fourth three-way valve 16 is connected with the outlet of the user hot water end 5, the first outlet of the fourth three-way valve 16 is connected with the inlet of the primary side of the third heat exchanger 15, the second outlet of the fourth three-way valve 16 is connected with the inlet of the primary side of the second heat exchanger 8, so as to communicate with the return water port of the gas furnace 1 through the second heat exchanger 8, and the outlet of the primary side of the third heat exchanger 15 is connected with the inlet of the primary side of the second heat exchanger 8.

[0074] The four valves of the four-way valve 22 are respectively communicated with the return flow port of the compressor 21, the outlet of the secondary side of the third heat exchanger 15, the evaporator 23 and the condenser 25, and are used for adjusting the flow direction of the refrigerant in the heat pump 2. When the refrigerant flows out from the compressor 21 and passes through the third heat exchanger 15, under the conduction of the four-way valve 22, the refrigerant passes through the evaporator 23 and the condenser 25 in turn and then returns to the compressor 21, then the heat pump 2 is used for refrigeration. Conversely, when the refrigerant flows out from the compressor 21, first passes through the condenser 25, then passes through the evaporator 23, and finally returns to the compressor 21, then the heat pump 2 is used for heating.

[0075] When the heat pump 2 is cooling, the condenser 25 is used as an evaporator, the gas stove 1 is coupled with the heat pump 2 through the third heat exchanger 15, so that the refrigerant in the heat pump 2 is preheated by the low-temperature water flowing back to the gas stove 1, the temperature of the refrigerant entering the evaporator 23 (at this time the evaporator 23 is used as a condenser) is reduced, so that the burden of the evaporator 23 is reduced, and the refrigerant does not need to be reduced from a very high temperature to a condensing temperature, reducing the workload of the evaporator 23, so that the evaporator 23 can more efficiently complete the cooling and condensing process, reducing or even avoiding the phenomenon of fouling and material fatigue of the evaporator 23, so as to achieve the purpose of improving the cooling efficiency of the heat pump 2.

[0076] At the same time, in the heat pump 2, the high-temperature refrigerant flowing out of the compressor 21 can exchange heat with the water flowing back to the gas stove 1 from the user hot water end 5, so that the water is preheated before flowing back to the gas stove 1, and the basic temperature of the water is increased when the gas stove 1 heats the water, thereby improving the working efficiency of the gas stove 1 and reducing the energy consumption of the gas stove 1.

[0077] When the heat pump 2 is heating, the first outlet of the fourth three-way valve 16 is closed, so that the third heat exchanger 15 no longer functions as a heat exchanger. At the same time, when the temperature of the water flowing back after being used through the user hot water end 5 is high enough and the water flowing back to the gas stove 1 does not need to be exchanged by the third heat exchanger 15, the fourth three-way valve 16 can be adjusted to close the first outlet of the fourth three-way valve 16.

[0078] In summary, the present application provides a gas-electricity complementary heat exchange system, which comprises: a gas stove connected with a gas pipe network; a heat pump connected with a city power grid; a user heat exchange space; a first heat exchanger; the primary side of the first heat exchanger is connected with the gas stove, and the secondary side of the first heat exchanger is connected with the user heat exchange space and the heat pump, respectively; the outlet of the user heat exchange space is connected with the heat pump, so as to form a water circulation loop among the user heat exchange space, the heat pump and the secondary side of the first heat exchanger. The present application realizes the complementation of gas and electricity heat sources, and the user heat exchange space can be heated by the heat pump and the gas stove, respectively. Through intelligent control, the working time and power output of the gas stove and the heat pump are reasonably scheduled, for example: when the load of the city power grid is high, the gas stove is used for heating preferentially, and the gas stove is used as the main heat source, and when the load of the city power grid is low, the heat pump is used. In this way, the dependence on the city power grid can be reduced, the pressure of the city power grid can be avoided from being too large, and the power demand of the heat pump can be reduced.

[0079] It should be understood that the application is not limited to the examples described above, which can be modified or transformed by a person of ordinary skill in the art in light of the above description, all these modifications and transformations being intended to belong to the scope of protection of the claims appended to the application.

Claims

1. A gas-electricity complementary heat exchange system, characterized in that: It includes: Gas furnace, connected to the gas network; Heat pump, connected to the mains electricity network; User heat exchange space; a first heat exchanger; a primary side of the first heat exchanger is connected to the gas furnace, and a secondary side of the first heat exchanger is respectively connected to the inlet of the user heat exchange space and the heat pump; an outlet of the user heat exchange space is connected to the heat pump to form a water circulation loop between the user heat exchange space, the heat pump and the secondary side of the first heat exchanger.

2. The gas-electricity complementary heat exchange system according to claim 1, characterized in that: It also includes: User hot water end; the gas furnace is connected to the user hot water end and supplies hot water to the user hot water end; The first three-way valve is arranged between the water outlet of the gas furnace and the user hot water end, and is connected to the inlet of the primary side of the first heat exchanger; the outlet of the primary side of the first heat exchanger is connected to the return water port of the gas furnace.

3. The gas-electricity complementary heat exchange system according to claim 2, characterized in that: It also includes: a flue gas exhaust pipe connected to the flue gas outlet of the gas furnace; The second heat exchanger; the primary side of the second heat exchanger is connected to the return water port of the gas furnace and the user's hot water end respectively, and the secondary side of the second heat exchanger is connected to the flue gas exhaust pipe.

4. The gas-electricity complementary heat exchange system according to claim 1, characterized in that: The user heat exchange space includes: Auxiliary cooling equipment; the inlet of the auxiliary cooling equipment is connected to the first heat exchanger and the heat pump respectively; the outlet of the auxiliary cooling equipment is connected to the heat pump; Floor heating; the inlet of the floor heating is connected to the first heat exchanger and the heat pump respectively; the outlet of the floor heating is connected to the heat pump.

5. The gas-electricity complementary heat exchange system according to claim 4, characterized in that: It also includes: a water inlet pipe, one end of which is connected to the heat pump, and the other end of which is connected to the inlet of the auxiliary cooling device after passing through the secondary side of the first heat exchanger; a water outlet pipe, one end of which is connected to the outlet of the auxiliary cooling device and the other end of which is connected to the heat pump; A second three-way valve is provided on the water inlet pipeline and is located between the first heat exchanger and the auxiliary cooling device; the second three-way valve is also connected to the inlet of the floor heating; The third three-way valve is arranged on the water outlet pipe and is located between the auxiliary cooling device and the heat pump; the third three-way valve is also connected to the outlet of the floor heating.

6. The gas-electricity complementary heat exchange system according to claim 5, characterized in that: It also includes: A water pump is arranged on the water outlet pipeline.

7. The gas-electricity complementary heat exchange system according to claim 6, characterized in that: It also includes: The water tank is arranged on the water outlet pipeline and is located between the water pump and the third three-way valve.

8. The gas-electricity complementary heat exchange system according to claim 3, characterized in that: The heat pump comprises: A compressor connected to the mains electricity network; Four-way valve; evaporator; Throttle valve; condenser; The compressor, the four-way valve, the evaporator, the throttle valve and the condenser are sequentially connected in series to form a refrigerant circulation loop.

9. The gas-electricity complementary heat exchange system according to claim 8, characterized in that: It also includes: The third heat exchanger; the primary side of the third heat exchanger is connected to the user hot water end and the second heat exchanger respectively, and the secondary side of the third heat exchanger is connected to the compressor and the four-way valve respectively.

10. The gas-electricity complementary heat exchange system according to claim 9, characterized in that: It also includes: The fourth three-way valve is arranged between the third heat exchanger and the user hot water end; the fourth three-way valve is also connected to the second heat exchanger.

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