Pneumatic-electric complementary heat exchange system

Abstract

The invention 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, and in particular to a gas-electricity complementary heat exchange system. Background Art

[0002] In the prior art, when heating the user's heat exchange space, the user's heat exchange space is usually connected through a heat pump to achieve heat exchange in the user's heat exchange space; the start-up of the heat pump needs to rely on the municipal power network, and the heat pump consumes a lot of energy when exchanging heat for the user's heat exchange space, especially during winter heating, during the peak period of energy demand, which puts great pressure on electricity resources.

[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 gas-electricity complementary heat exchange system in view of the above-mentioned defects of the prior art, aiming at reducing the power supply pressure of electric power resources.

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

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

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

[0008] Heat pump, connected to the city electricity network;

[0009] User heat exchange space;

[0010] 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 an 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.

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

[0012] 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;

[0013] The first three-way valve is arranged between the water outlet of the gas furnace and the user's 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.

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

[0015] A smoke exhaust pipe connected to the smoke outlet of the gas furnace;

[0016] 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.

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

[0018] 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;

[0019] 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.

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

[0021] A water inlet pipeline, 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;

[0022] A water outlet pipeline, 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;

[0023] 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;

[0024] The third three-way valve is arranged on the water outlet pipeline 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.

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

[0026] A water pump is arranged on the water outlet pipeline.

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

[0028] The water tank is arranged on the water outlet pipeline and is 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 connected to the mains electricity network;

[0031] Four-way valve;

[0032] Evaporator;

[0033] Throttle valve;

[0034] Condenser;

[0035] 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.

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

[0037] 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.

[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; the fourth three-way valve is also connected to the second heat exchanger.

[0040] Beneficial effect: The present application realizes the complementarity of gas and electric heat sources. The user's 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 are reasonably scheduled. For example, when the load of the municipal power network is high, the gas furnace is used for heating first, and the gas furnace is used as the main heating source, and the heat pump is used when the load of the municipal power network is low. This can reduce the dependence on the municipal power network, avoid excessive pressure on the municipal power network, and reduce the power demand of the heat pump. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0042] 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.

[0043] 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.

[0044] The present application provides a gas-electricity complementary heat exchange system, such as Figure 1 As shown, the gas-electric complementary heat exchange system includes a gas furnace 1, a heat pump 2, a user heat exchange space 3 and a first heat exchanger 4; the gas furnace 1 is connected to the gas pipeline network 200, and the heat pump 2 is connected to the municipal power pipeline network 100; the primary side of the first heat exchanger 4 is connected to the gas furnace 1, and the secondary side of the first heat exchanger 4 is respectively connected to the inlet of the user heat exchange space 3 and the heat pump 2; the outlet of the user heat exchange space 3 is connected to the heat pump 2 to form a water circulation loop between the user heat exchange space 3, the heat pump 2 and the secondary side of the first heat exchanger 4.

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

[0046] It can be seen that the present application realizes the complementarity of gas and electric heat sources. The user heat exchange space 3 can be heated by the heat pump 2 and the gas furnace 1 respectively. Then, through intelligent control, the working time and power output of the gas furnace 1 and the heat pump 2 are reasonably scheduled. For example, when the load of the municipal power network 100 is high, the gas furnace 1 is used for heating first, and the gas furnace 1 is used as the main heating source, and the heat pump 2 is used when the load of the municipal power network 100 is low. In this way, the dependence on the municipal power network 100 can be reduced, the excessive pressure of the municipal power network 100 can be avoided, and the power demand of the heat pump 2 can be reduced.

[0047] The gas-electric complementary heat exchange system also includes a user hot water end 5 and a first three-way valve 6; the gas furnace 1 is connected to the user hot water end 5 and supplies hot water to the user hot water end 5; the first three-way valve 6 is arranged between the water outlet of the gas furnace 1 and the user hot water end 5, and is connected to the inlet of the primary side of the first heat exchanger 4; the outlet of the primary side of the first heat exchanger 4 is connected to the return water port of the gas furnace 1.

[0048] Specifically, the inlet of the first three-way valve 6 is connected to the water outlet of the gas furnace 1. Among the two outlets (the first outlet and the second outlet) of the first three-way valve 6, the first outlet of the first three-way valve 6 is connected to the user hot water end 5, so that the hot water discharged from the gas furnace 1 is transported to the user hot water end 5 for user use; the second outlet of the first three-way valve 6 is connected to the inlet of the primary side of the first heat exchanger 4, so that the hot water discharged from the gas furnace 1 is transported to the first heat exchanger 4, and heat is exchanged with the user heat exchange space 3 through the first heat exchanger 4, so as 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 open, the gas furnace 1 can heat the user's heat exchange space 3 while supplying hot water to the user's hot water terminal 5, so that the gas furnace 1 becomes an auxiliary heat source. Through the heat exchange effect of the first heat exchanger 4, the gas furnace 1 and the heat pump 2 can jointly meet the heat demand of the floor heating 32, thereby improving the reliability and flexibility of the heating system. This synchronous auxiliary heating method is particularly suitable for cold weather. If the heat pump 2 operates alone, it may not be able to efficiently heat the user's heat exchange space 3. Adding the first heat exchanger 4 and combining it with the gas furnace 1 can reduce the load of the heat pump 2, thereby saving energy and extending the service life of the heat pump 2.

[0050] When the user heat exchange space 3 needs to execute the cooling mode, or heat the user heat exchange space 3 through the heat pump 2 only in the electric mode, the second outlet of the first three-way valve 6 can be closed, and the gas furnace 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 heat exchange role.

[0051] In one embodiment of the present application, the gas-electric complementary heat exchange system also includes a flue gas exhaust pipe 7 and a second heat exchanger 8; the flue gas exhaust pipe 7 is connected to the flue gas outlet of the gas furnace 1; the primary side of the second heat exchanger 8 is respectively connected to the return water port of the gas furnace 1 and the user hot water end 5, and the secondary side of the second heat exchanger 8 is connected to the flue gas exhaust pipe 7.

[0052] Specifically, the inlet of the primary side of the second heat exchanger 8 is connected to the outlet of the user hot water end 5, and the outlet of the primary side of the second heat exchanger 8 is connected to the water return port of the gas furnace 1; the smoke outlet of the gas furnace 1 is connected to the smoke exhaust pipe 7, and the smoke exhaust pipe 7 is respectively connected to the inlet and outlet of the secondary side of the second heat exchanger 8, so that the smoke exhausted by the gas furnace 1 first passes through the secondary side of the second heat exchanger 8 before being discharged to the outdoors. The water that flows back to the gas furnace 1 after use at the user hot water end 5 first enters the second heat exchanger 8, exchanges heat with the smoke exhausted by the gas furnace 1, and then flows back to the gas furnace 1.

[0053] The gas furnace 1 generates high-temperature flue gas during combustion, and a large amount of heat energy will be wasted if it is discharged directly. By installing the second heat exchanger 8 at the flue gas outlet of the gas furnace 1, the heat in the flue gas can be used to preheat the return water of the user's hot water end 5, thereby recovering a part of the heat energy. Since the return water is preheated by the second heat exchanger 8, its temperature is higher than the return water temperature directly flowing back from the user's hot water end 5 to the gas furnace 1, so the heating time and gas consumption required for the gas furnace 1 are reduced, thereby improving thermal efficiency and saving gas.

[0054] After the second heat exchanger 8 recovers the flue gas heat, the exhaust temperature of the flue gas is significantly reduced, which not only reduces energy waste, but also reduces the thermal pollution discharged into the atmosphere, meeting the requirements 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 to the first heat exchanger 4 and the heat pump 2; the outlet of the auxiliary cooling device 31 is connected to the heat pump 2; the inlet of the floor heating 32 is respectively connected to the first heat exchanger 4 and the heat pump 2; the outlet of the floor heating 32 is connected to the heat pump 2.

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

[0057] The coil 312 is connected to the heat pump 2; when the heat pump 2 is cooling, the heat pump 2 transfers the cold to the coil 312 to cool the coil 312; therefore, when the fan 313 is turned on, the fan 313 accelerates the heat exchange rate between the air and the coil 312 by forcing the air to flow, and the air passes through the low-temperature surface of the coil 312, so that the cold of the low-temperature coil 312 can be quickly transferred, thereby quickly absorbing the heat of the surrounding hot air, reducing the air temperature, and further improving the heat exchange efficiency. When it is necessary to heat the floor heating 32, 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 includes a compressor 21, a four-way valve 22, an evaporator 23, a throttle valve 24 and a condenser 35; the compressor 21 is connected to the mains network 100; the compressor 21, the four-way valve 22, the evaporator 23, the throttle valve 24 and the condenser 25 are connected in series in sequence to form a refrigerant circulation loop.

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

[0060] The coil 312 is connected to 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, and the condenser 25 is used as an evaporator. At the same time, 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 an auxiliary cooling role in the user heat exchange space 3 and improving the cooling effect of the user heat exchange space 3. Specifically, when the heat pump 2 is cooling, the condenser 25 is used as an evaporator to absorb heat through evaporation of the refrigerant to reduce the ambient temperature; through the connection between the secondary side of the condenser 25 and the auxiliary cooling device 31, the water on the secondary side of the condenser 25 exchanges heat in the condenser 25, and transfers the cold energy to the coil 312 to cool the coil 312; therefore, when the fan 313 is turned on, the fan 313 accelerates the heat exchange rate between the air and the coil 312 by forcing air to flow, and the air passes through the low-temperature surface of the coil 312, so that the cold energy of the low-temperature coil 312 can be quickly transferred, thereby quickly absorbing the heat of the surrounding hot air, reducing the air temperature, 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 heater 32 , thereby achieving heating of the floor heater 32 .

[0062] The gas-electric complementary heat exchange system also includes an inlet pipe 9, an outlet pipe 10, a second three-way valve 11 and a third three-way valve 12; one end of the inlet pipe 9 is connected to the heat pump 2, and the other end of the inlet pipe 9 is connected to the inlet of the auxiliary cooling device 31 after passing through the secondary side of the first heat exchanger 4; one end of the outlet pipe 10 is connected to the outlet of the auxiliary cooling device 31, and the other end of the outlet pipe 10 is connected to the heat pump 2; the second three-way valve 11 is arranged on the inlet pipe 9 and is located between the first heat exchanger 4 and the auxiliary cooling device 31; the second three-way valve 11 is also connected to the inlet of the floor heating 32; the third three-way valve 12 is arranged on the outlet pipe 10 and is located between the auxiliary cooling device 31 and the heat pump 2; the third three-way valve 12 is also connected to 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 equipment 31 through the second three-way valve 11 and the third three-way valve 12 respectively; the inlet of the second three-way valve 11 is connected to the secondary side of the first heat exchanger 4, the first outlet of the second three-way valve 11 is connected to the auxiliary cooling equipment 31, and the second outlet of the second three-way valve 11 is connected to the inlet of the floor heating 32; the first inlet of the third three-way valve 12 is connected to the auxiliary cooling equipment 31, the second inlet of the third three-way valve 12 is connected to the floor heating 32, and the outlet of the third three-way valve 12 is connected to 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 at the same time, so that the auxiliary cooling device 31 is only connected to the secondary side of the condenser 25, thereby forming a water circulation loop to achieve cooling and cooling of the auxiliary cooling device 31. When the gas-electric 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 furnace 1 at the same time, and the heating of the floor heating 32 is achieved.

[0065] In one embodiment of the present application, the gas-electricity complementary heat exchange system further includes a water pump 13 , which is disposed on the water outlet pipeline 10 .

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

[0067] In addition, in winter, the temperature of the water discharged from the floor heating 32 may be relatively low when it returns to the heat pump 2. Without the help of the water pump 13, the water flow may be blocked and the return water temperature may be lower than the tolerance range of the heat pump 2, affecting the performance and life of the heat pump 2. Therefore, in this embodiment, the water pump 13 is provided to ensure that the return water temperature is within the designed temperature range of the heat pump 2, which helps to protect the equipment body of the heat pump 2.

[0068] In one implementation of the present embodiment, the gas-electricity complementary heat exchange system further includes a water tank 14 , which is disposed 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 pipe 10, the water tank 14 is located upstream of the water pump 13 and downstream of the third three-way valve 12. Providing the water tank 14 upstream of the water pump 13 can ensure that the water pump 13 always has sufficient water source when starting, and avoid the water pump 13 from sucking in air or empty suction; empty suction will cause the water pump 13 to fail to work properly and may even damage the water pump 13, and the water tank 14 can provide a constant water source for the water pump 13 to avoid the problem of empty suction.

[0070] At the same time, the water tank 14 can store excess cold (cooling mode) or heat (heating mode), storing excess cold and heat when the load demand is low, and providing supplementary heat when the load demand increases. This heat storage or cold storage function reduces the operating pressure of the heat pump 2, allowing the heat pump 2 to operate under relatively stable load conditions, and improving the overall efficiency and durability of the gas-electric 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 water flow rate from the secondary side of the condenser 25 to the floor heating 32 and the auxiliary cooling equipment 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 equipment 31 is sufficient, thereby ensuring the uniformity and stability of cooling and heating, and avoiding fluctuations in the supply of cold and heat caused by unstable pressure in the gas-electric complementary heat exchange system. In addition, during extreme load periods (such as peak electricity consumption, extreme weather) or when the heat pump 2 is briefly shut down for maintenance, the hot water or cold water in the water tank 14 can temporarily guarantee the heating or cooling needs of the system, improve the reliability and safety of heating and cooling of the gas-electric complementary heat exchange system, and avoid system interruptions.

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

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

[0074] The four valves of the four-way valve 22 are respectively connected to the return 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 to adjust the flow direction of the refrigerant in the heat pump 2. When the refrigerant flows out of the compressor 21 and passes through the third heat exchanger 15, under the conduction effect of the four-way valve 22, the refrigerant passes through the evaporator 23 and the condenser 25 in sequence, and then flows back to the compressor 21, then the heat pump 2 is used for cooling. On the contrary, when the refrigerant flows out of the compressor 21, first passes through the condenser 25, then passes through the evaporator 23, and finally flows back 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, and the gas furnace 1 and the heat pump 2 are coupled through the third heat exchanger 15, so that the refrigerant in the heat pump 2 is pre-heated by the low-temperature water returning to the gas furnace 1, thereby reducing the temperature of the refrigerant entering the evaporator 23 (at this time the evaporator 23 is used as a condenser), so that the burden of the evaporator 23 is reduced, and there is no need to reduce the refrigerant from an extremely high temperature to the condensation temperature, thereby reducing the workload of the evaporator 23. The evaporator 23 can complete the cooling and condensation process more efficiently, reducing or even avoiding the scaling and material fatigue of the evaporator 23, thereby achieving the purpose of improving the refrigeration efficiency of the heat pump 2.

[0076] At the same time, in the heat pump 2, the high-temperature refrigerant flowing out from the compressor 21 can exchange heat with the water returning from the user's hot water end 5 to the gas furnace 1, so that the water is preheated before returning to the gas furnace 1. When the gas furnace 1 heats the water, the basic temperature of the water is increased, thereby improving the working efficiency of the gas furnace 1 and reducing the energy consumption of the gas furnace 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 performs heat exchange. At the same time, when the temperature of the water returned after use through the user's hot water end 5 is high enough, and it is not necessary to perform heat exchange of the water returned to the gas furnace 1 through 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-electric complementary heat exchange system, which includes: a gas furnace connected to a gas pipeline network; a heat pump connected to a mains pipeline network; a user heat exchange space; a first heat exchanger; the primary side of the first heat exchanger is connected to the gas furnace, and the secondary side of the first heat exchanger is respectively connected to the inlet of the user heat exchange space and the heat pump; the 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. The present application realizes the complementarity of gas and electric heat sources, and the user heat exchange space can be heated by the heat pump and the gas furnace respectively. Then, through intelligent control, the working time and power output of the gas furnace and the heat pump are reasonably scheduled, for example: when the load of the mains pipeline network is high, the gas furnace is used for heating first, and the gas furnace is used as the main heat source, and the heat pump is used when the load of the mains pipeline network is low; this can reduce the dependence on the mains pipeline network, avoid excessive pressure on the mains pipeline network, and reduce the power demand of the heat pump.

[0079] 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 gas-electricity complementary heat exchange system, characterized in that: It includes: A gas furnace connected to a gas network; Heat pump, connected to the city 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 an 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's 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 smoke exhaust pipe connected to the smoke 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 pipeline, 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 pipeline, 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 pipeline 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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