Efficient heat pump system for preventing frosting by using flue gas waste heat

Abstract

The invention relates to the technical field of heat pump heat supply. An efficient heat pump system capable of preventing frosting through smoke waste heat comprises a fireplace smoke exhaust system, a water tank heat exchange system and a heat pump circulation system, the fireplace smoke exhaust system comprises a fireplace structure, and the fireplace structure is connected with the water tank heat exchange system through a smoke exhaust pipeline; and the water tank heat exchange system is communicated with the heat pump circulating system through a circulating cooling pipeline which is in one-way circulating communication. According to the efficient heat pump system capable of preventing frosting through the waste heat of the flue gas, the evaporator of the heat pump can be heated through the waste heat of the flue gas generated by a fireplace, frosting of the evaporator is effectively prevented, the heating efficiency and the heating capacity of the heat pump in the low-temperature environment are improved, and the efficient and environment-friendly heating target is achieved. The problems that in the prior art, an evaporator of a heat pump is prone to frosting under the cold weather condition at present; and extra electric energy can be consumed in a common heating mode for defrosting, and in cold weather, the reliability of power supply can not be guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of heat pump heating, and in particular to a high-efficiency heat pump system utilizing flue gas waste heat to prevent frost. Background Art

[0002] Heat pumps have been widely used in the heating field, especially in the cold northern regions. They absorb heat from the outdoor air and transfer it to the indoor area, providing an efficient heating method. However, in the cold winter in the north, the ambient temperature often drops below zero, and the operation of heat pumps faces a key problem - the evaporator is prone to frost.

[0003] When the heat pump works in a low-temperature environment, the evaporator transfers the heat in the air to the refrigerant by exchanging heat with the air. However, in a low-temperature environment, the moisture in the air will condense into frost on the surface of the evaporator. The frost layer gradually thickens, which not only hinders the heat exchange between the air and the evaporator, but also increases the resistance of air flow. This situation causes the heating efficiency of the heat pump to drop sharply, the heating capacity is limited, and in severe cases, the heat pump may even stop working. To deal with this problem, a common solution is to use electric heating to defrost, that is, to attach a heating wire to the surface of the evaporator to melt the frost layer by heating.

[0004] However, although electric heating defrosting can temporarily solve the frost problem, it also brings new problems. First, electric heating consumes additional electricity, which increases the energy consumption of the system and reduces the overall energy saving effect of the heat pump. Secondly, frequent heating and defrosting processes not only affect the continuous heating capacity of the heat pump, but may also shorten the service life of the equipment. In addition, the effect of electric heating is limited by the power supply, especially in cold weather when the power grid load is large, the power supply reliability may not be guaranteed, so it is necessary to improve it. Summary of the invention

[0005] The present invention provides a method of heating a heat pump evaporator by using the waste heat of flue gas generated by a fireplace, thereby effectively preventing the evaporator from frosting. At the same time, the use of the waste heat of flue gas increases the temperature of the evaporator, thereby improving the heating efficiency and heating capacity of the heat pump in a low-temperature environment. The present invention is suitable for various fireplace and heat pump combinations, and achieves the goal of efficient and environmentally friendly heating. It is a high-efficiency heat pump system that uses waste heat of flue gas to prevent frost; it solves the technical problems in the prior art that the evaporator of the heat pump is prone to frost in cold weather, causing the heating efficiency of the heat pump to drop sharply and the heating capacity to be limited; ordinary heating methods for defrosting consume extra electricity, increase the energy consumption of the system, and reduce the energy-saving effect of the heat pump. Secondly, frequent heating and defrosting processes not only affect the continuous heating capacity of the heat pump, but also may shorten the service life of the equipment. In cold weather when the power grid load is heavy, the power supply reliability may not be guaranteed.

[0006] The above technical problems of the present invention are solved by the following technical solutions: an efficient heat pump system that utilizes flue gas waste heat to prevent frosting, comprising a fireplace exhaust system, a water tank heat exchange system and a heat pump circulation system, wherein the fireplace exhaust system comprises a fireplace structure, the fireplace structure and the water tank heat exchange system are connected via an exhaust pipe; the water tank heat exchange system and the heat pump circulation system are connected via a circulating cooling pipe that is unidirectionally circulated. The system of the present invention is roughly divided into three parts, a fireplace exhaust system, a water tank heat exchange system and a heat pump circulation system, wherein the fireplace combustion first heats the indoor air, and then the flue gas enters the water tank heat exchange system, and the flue gas waste heat is utilized to heat the water tank, thereby preventing the heat pump evaporator from frosting in a low temperature environment; at the same time, the heat pump circulation system and the water tank heat exchange system cooperate to further heat the indoor air, thereby improving the heating efficiency and overall performance of the heat pump, and achieving the purpose of efficient and energy-saving heating.

[0007] Preferably, the water tank heat exchange system is arranged outdoors, and the fireplace smoke exhaust system and the heat pump circulation system are installed indoors. During installation, according to the working characteristics of each system, it is necessary to arrange the water tank heat exchange system outdoors, and the fireplace smoke exhaust system and the heat pump circulation system are installed indoors to heat the air, and use the fireplace smoke exhaust system to prevent the evaporator in the water tank heat exchange system from frosting.

[0008] Preferably, the fireplace structure comprises a fireplace, and a heat dissipation pipe, a smoke recovery channel and a fireplace smoke exhaust port are provided on the fireplace. The smoke generated by the fireplace during combustion first passes through the heat dissipation pipe and is heated by the indoor air, and then is guided by the smoke exhaust fan built into the fireplace, collected through the smoke recovery channel, and finally converged to the fireplace smoke exhaust port for discharge.

[0009] Preferably, the water tank heat exchange system comprises a water tank, a fin heat exchanger connected to a smoke exhaust pipe is arranged in the water tank, and a smoke outlet connected to the outdoor environment is arranged at the port of the fin heat exchanger. The smoke generated during the combustion of the fireplace is guided along the smoke exhaust pipe through the fireplace smoke exhaust port to the fin heat exchanger in the water tank. In the fin heat exchanger, the smoke and the water in the water tank are efficiently heat-exchanged to achieve heating of the water in the water tank, thereby preventing the evaporator from frosting in a low temperature environment. The smoke after the heat exchange is finally discharged to the external environment through the smoke outlet.

[0010] Preferably, the fin heat exchanger is a continuously bent pipe, the two ends of the pipe of the fin heat exchanger are connected to the fireplace smoke outlet and the smoke outlet, and the middle part is continuous. The fin heat exchanger pipe of the present invention is a continuously winding pipe, which is continuous and uninterrupted in the middle, can efficiently heat the water in the water pump, prevent the evaporator in the water pump from frosting, and ensure the working efficiency and stability of the heat pump.

[0011] Preferably, the heat pump circulation system includes a condenser arranged indoors, the circulating cooling pipe between the water tank and the condenser is a one-way channel, a compressor is provided in the direction from the water tank to the condenser, and a throttle valve is provided in the direction from the condenser to the water tank. The refrigerant in the heat pump circulation system is sent to the compressor through a pipe, and is converted into a high-temperature and high-pressure gas state after compression, and then the high-temperature and high-pressure gas enters the condenser for condensation, releasing heat to heat the air in the room.

[0012] Preferably, the heat pump circulation system further comprises an evaporator in the water tank. The condensed refrigerant is depressurized by the throttle valve and flows into the evaporator, where the refrigerant exchanges heat with the hot water in the water tank, absorbs heat and turns back into gaseous state, and is sucked into the compressor, thus forming a complete circulation process.

[0013] A circulation method for preventing frost of a high-efficiency heat pump using waste heat of flue gas, used in the above-mentioned high-efficiency heat pump system using waste heat of flue gas to prevent frost, characterized in that it includes the following steps: Step a: The smoke generated by the fireplace during the combustion process is first heated by the indoor air through the heat dissipation pipe, then guided by the built-in smoke exhaust fan of the fireplace, collected through the smoke recovery channel, and finally converged to the fireplace exhaust port for discharge.

[0014] Step b, the smoke generated during the combustion of the fireplace is guided along the smoke exhaust pipe through the fireplace exhaust port to the fin heat exchanger in the water tank. In the fin heat exchanger, the smoke and the water in the water tank are efficiently heat exchanged to achieve heating of the water in the water tank, thereby preventing the evaporator from frosting in a low temperature environment. The smoke after the heat exchange is finally discharged to the external environment through the smoke outlet.

[0015] Step c, the refrigerant in the heat pump circulation system is sent to the compressor through a pipeline, and is converted into a high-temperature and high-pressure gas state after compression. The high-temperature and high-pressure gas then enters the condenser for condensation, releasing heat to heat the air in the room.

[0016] In step d, the condensed refrigerant is depressurized by the throttle valve and flows into the evaporator. The refrigerant exchanges heat with the hot water in the water tank in the evaporator, absorbs heat and turns back into gas, and is sucked into the compressor, thus forming a complete cycle process.

[0017] Therefore, the high-efficiency heat pump system using flue gas waste heat to prevent frosting of the present invention has the following advantages: the waste heat of flue gas generated by the fireplace can be used to heat the heat pump evaporator, effectively preventing the evaporator from frosting; at the same time, the use of flue gas waste heat increases the temperature of the evaporator, thereby improving the heating efficiency and heating capacity of the heat pump in a low-temperature environment; it is suitable for various fireplace and heat pump combinations, and achieves the goal of efficient and environmentally friendly heating. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a system structure diagram of a high-efficiency heat pump system that utilizes flue gas waste heat to prevent frost according to the present invention.

[0019] Figure 2 It is a three-dimensional structural schematic diagram of the fireplace structure in the present invention.

[0020] In the figure, there are a fireplace structure 1, a smoke exhaust pipe 2, a heat dissipation pipe 3, a smoke recovery channel 4, a fireplace smoke exhaust port 5, a water tank 6, a fin heat exchanger 7, a smoke outlet 8, a circulating cooling pipe 9, a condenser 10, an evaporator 11, a compressor 12, and a throttle valve 13. DETAILED DESCRIPTION

[0021] The technical solution of the invention is further specifically described below through embodiments and in conjunction with the accompanying drawings.

[0022] Example: like Figure 1 and 2 As shown, a high-efficiency heat pump system that utilizes flue gas waste heat to prevent frost formation includes a fireplace exhaust system, a water tank heat exchange system, and a heat pump circulation system; the water tank heat exchange system is arranged outdoors, and the fireplace exhaust system and the heat pump circulation system are installed indoors.

[0023] The fireplace smoke exhaust system includes a fireplace structure 1, which is connected to the water tank heat exchange system through a smoke exhaust pipe 2; the fireplace structure 1 includes a fireplace, and a heat dissipation pipe 3, a smoke recovery channel 4 and a fireplace smoke exhaust port 5 are installed on the fireplace.

[0024] The water tank heat exchange system includes a water tank 6, in which a fin heat exchanger 7 connected to the smoke exhaust pipe 2 is installed. An evaporator 11 is also installed in the water tank 6. A smoke outlet 8 connected to the outdoor environment is installed at the port of the fin heat exchanger 7. The fin heat exchanger 7 is a continuously bent pipe. Both ends of the pipe of the fin heat exchanger 7 are connected to the fireplace smoke exhaust port 5 and the smoke outlet 8, and the middle part is continuous.

[0025] The water tank heat exchange system is connected to the heat pump circulation system through a circulating cooling pipe 9 with a one-way circulation connection; the heat pump circulation system includes a condenser 10 installed indoors, the circulating cooling pipe 9 between the water tank 6 and the condenser 10 is a one-way channel, a compressor 12 is provided in the direction of the water tank 6 flowing toward the condenser 10, and a throttle valve 13 is provided in the direction of the condenser 10 flowing toward the water tank 6.

[0026] The system working cycle steps of the present invention are as follows: In step a, the smoke generated by the fireplace during the combustion process first passes through the heat dissipation pipe 3 and is heated by the indoor air, and then is guided by the smoke exhaust fan built into the fireplace, collected through the smoke recovery channel 4, and finally converged to the fireplace exhaust port 5 for discharge.

[0027] In step b, the smoke generated during the combustion of the fireplace is guided along the smoke exhaust pipe 2 through the fireplace smoke exhaust port 5 to the fin heat exchanger 7 in the water tank 6. In the fin heat exchanger 7, the smoke and the water in the water tank 6 are efficiently heat exchanged to achieve heating of the water in the water tank 6, thereby preventing the evaporator 11 from frosting in a low temperature environment. The smoke after the heat exchange is finally discharged to the external environment through the smoke outlet 8.

[0028] In step c, the refrigerant in the heat pump circulation system is sent to the compressor 12 through a pipeline, and is converted into a high-temperature and high-pressure gas state after being compressed. The high-temperature and high-pressure gas then enters the condenser 10 for condensation, releasing heat to heat the air in the room.

[0029] In step d, the condensed refrigerant is depressurized by the throttle valve 13 and flows into the evaporator 11. The refrigerant exchanges heat with the hot water in the water tank 6 in the evaporator 11, absorbs heat and turns back into gas, and is sucked into the compressor 12, thus forming a complete cycle process.

[0030] The smoke generated by the combustion in the fireplace first heats the indoor air through the heat dissipation pipe 3, and is then discharged from the smoke exhaust port under the guidance of the fan; the smoke enters the fin heat exchanger 7, exchanges heat with the water in the water tank 6 to heat the water tank 6; at the same time, the refrigerant in the heat pump circulation system is converted into high-temperature and high-pressure gas under the action of the compressor 12, enters the condenser 10 to release heat and heat the air, and flows into the evaporator 11 in the water tank 6 after being reduced in pressure by the throttle valve 13, absorbs the heat of the water in the water tank 6, and then vaporizes and enters the compressor 12 again to form a cycle; through the present invention, the waste heat of the smoke generated by the fireplace is fully utilized, which not only effectively prevents the frosting of the heat pump evaporator 11 in a low-temperature environment, but also improves the heating efficiency and overall performance of the heat pump, and achieves the purpose of efficient and energy-saving heating.

[0031] The present invention utilizes the flue gas waste heat generated by the fireplace to heat the heat pump evaporator 11, effectively preventing the evaporator 11 from frosting; at the same time, the utilization of the flue gas waste heat increases the temperature of the evaporator 11, thereby improving the heating efficiency and heating capacity of the heat pump in a low temperature environment.

[0032] The present invention achieves a more even distribution of heat in the room through the combined heating of a heat pump and a fireplace; the heat pump is responsible for converting low-grade thermal energy in the external environment into high-grade thermal energy, which, combined with the heat generated by the combustion of the fireplace, improves the heating efficiency on the one hand, and reduces the local temperature unevenness that may be caused by heating with a single heat source on the other hand, thereby significantly improving the thermal comfort in the room.

[0033] The present invention is applicable to various fireplace and heat pump combinations, ensuring stable operation even in cold weather; it fully utilizes the flue gas waste heat generated by the fireplace combustion, reduces energy waste, and achieves the goal of efficient and environmentally friendly heating.

[0034] The specific embodiments described herein are merely examples of the concept of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A high-efficiency heat pump system that uses flue gas waste heat to prevent frost, characterized in that: It includes a fireplace smoke exhaust system, a water tank heat exchange system and a heat pump circulation system. The fireplace smoke exhaust system includes a fireplace structure, and the fireplace structure and the water tank heat exchange system are connected through a smoke exhaust pipe; the water tank heat exchange system and the heat pump circulation system are connected through a circulating cooling pipe with a one-way circulation connection.

2. The high-efficiency heat pump system for preventing frosting by utilizing flue gas waste heat according to claim 1, characterized in that: The water tank heat exchange system is arranged outdoors, and the fireplace smoke exhaust system and the heat pump circulation system are installed indoors.

3. The high-efficiency heat pump system for preventing frosting by utilizing flue gas waste heat according to claim 1, characterized in that: The fireplace structure comprises a fireplace, on which a heat dissipation pipe, a smoke recovery channel and a fireplace smoke exhaust port are arranged.

4. The high-efficiency heat pump system for preventing frosting by utilizing flue gas waste heat according to claim 1, characterized in that: The water tank heat exchange system comprises a water tank, in which a fin heat exchanger connected to a smoke exhaust pipe is arranged, and a smoke outlet connected to an outdoor environment is arranged at a port of the fin heat exchanger.

5. The high-efficiency heat pump system for preventing frosting by utilizing flue gas waste heat according to claim 4, characterized in that: The fin heat exchanger is a continuously bent pipe, both ends of which are connected to the fireplace smoke outlet and the smoke outlet, and the middle part of the pipe is continuous.

6. The high-efficiency heat pump system for preventing frosting by utilizing flue gas waste heat according to claim 1, characterized in that: The heat pump circulation system comprises a condenser arranged indoors, the circulating cooling pipeline between the water tank and the condenser is a one-way channel, a compressor is arranged in the direction from the water tank to the condenser, and a throttle valve is arranged in the direction from the condenser to the water tank.

7. The high-efficiency heat pump system for preventing frosting by utilizing flue gas waste heat according to claim 6, characterized in that: The heat pump circulation system also includes an evaporator in the water tank.

8. The working cycle of a high-efficiency heat pump system for preventing frosting by utilizing flue gas waste heat according to any one of claims 1 to 7, characterized in that: The following steps are included: Step a, the smoke generated by the fireplace during the combustion process is first heated by the indoor air through the heat dissipation pipe, then guided by the built-in smoke exhaust fan of the fireplace, collected through the smoke recovery channel, and finally converged to the fireplace exhaust port for discharge; Step b, the smoke generated during the combustion of the fireplace is guided along the smoke exhaust pipe through the fireplace smoke exhaust port to the fin heat exchanger in the water tank. In the fin heat exchanger, the smoke and the water in the water tank are efficiently heat-exchanged to achieve heating of the water in the water tank, thereby preventing the evaporator from frosting in a low-temperature environment. The smoke after the heat exchange is finally discharged to the external environment through the smoke outlet; Step c, the refrigerant in the heat pump circulation system is sent to the compressor through a pipeline, and is converted into a high-temperature and high-pressure gas state after being compressed. The high-temperature and high-pressure gas then enters the condenser for condensation, releasing heat to heat the air in the room; In step d, the condensed refrigerant is depressurized by the throttle valve and flows into the evaporator. The refrigerant exchanges heat with the hot water in the water tank in the evaporator, absorbs heat and turns back into gas, and is sucked into the compressor, thus forming a complete cycle process.

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