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

Abstract

The utility model 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 present application relates to the technical field of heat pump heating, in particular to a high-efficiency heat pump system for preventing frosting by utilizing flue gas waste heat. BACKGROUND

[0002] Heat pumps have been widely used in the field of heating, especially in cold northern regions. They provide efficient heating by absorbing heat from outdoor air and transferring it indoors. However, in cold northern regions during winter, the ambient temperature often drops below zero, and heat pumps face a critical problem - the evaporator is prone to frosting.

[0003] When a heat pump operates in a low-temperature environment, the evaporator transfers heat from the air to the refrigerant through heat exchange with the air. However, in a low-temperature environment, the moisture in the air will condense into frost on the surface of the evaporator, and the frost layer will gradually thicken, not only hindering the heat exchange between the air and the evaporator, but also increasing the air flow resistance. This situation causes the heat pump heating efficiency to drop sharply, limiting the heating capacity, and in severe cases, the heat pump may even stop working. To address this problem, the common solution is to use electric heating defrosting, which adds heating wires to the surface of the evaporator to melt the frost layer.

[0004] However, electric heating defrosting, while temporarily solving the frost problem, also brings new problems. First, electric heating consumes additional electrical energy, increasing the system's energy consumption and reducing the overall energy-saving effect of the heat pump. Second, 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 addition, the effectiveness of electric heating is limited by the supply of electricity, especially in cold weather when the power grid load is heavy, the reliability of power supply may not be guaranteed, thus improvement is necessary. SUMMARY

[0005] The present application provides a high-efficiency heat pump system for preventing frosting by utilizing flue gas waste heat, which can heat the heat pump evaporator by the waste heat of flue gas generated by a fireplace, effectively preventing the evaporator from frosting, and the utilization of flue gas waste heat increases the temperature of the evaporator, improving the heating efficiency and heating capacity of the heat pump in low-temperature environments, suitable for various combinations of fireplaces and heat pumps, achieving the goal of efficient and environmentally friendly heating. The present application solves the technical problems in the prior art that the evaporator of the heat pump is prone to frosting in cold weather, causing the heat pump heating efficiency to drop sharply and the heating capacity to be limited; the ordinary heating method consumes additional electrical energy, increasing the system's energy consumption and reducing the energy-saving effect of the heat pump, secondly, the 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, and in cold weather when the power grid load is heavy, the reliability of power supply may not be guaranteed.

[0006] The above technical problem of the present application is solved by the following technical scheme: a high-efficiency heat pump system for preventing frost formation by using flue gas waste heat, comprising a fireplace flue gas exhaust system, a water tank heat exchange system and a heat pump circulation system, wherein the fireplace flue gas exhaust system comprises a fireplace structure, the fireplace structure is connected with the water tank heat exchange system through a flue gas exhaust pipeline, and the water tank heat exchange system is connected with the heat pump circulation system through a one-way circulation communication circulation cooling pipeline. The system of the present application is roughly divided into three parts, namely the fireplace flue gas exhaust system, the water tank heat exchange system and the heat pump circulation system. The fireplace first heats indoor air, and then the flue gas enters the water tank heat exchange system to heat the water tank by using flue gas waste heat, thereby preventing frost formation of the evaporator in the water tank in a low temperature environment. Meanwhile, the heat pump circulation system and the water tank heat exchange system cooperate to further heat indoor air, thereby improving the heating efficiency and overall performance of the heat pump and achieving the purpose of high-efficiency and energy-saving heating.

[0007] Preferably, the water tank heat exchange system is arranged outdoors, and the fireplace flue gas exhaust system and the heat pump circulation system are arranged indoors. During installation, the water tank heat exchange system is arranged outdoors, and the fireplace flue gas exhaust system and the heat pump circulation system are arranged indoors to heat air by the working characteristics of the systems, and the fireplace flue gas exhaust system is used to prevent frost formation of the evaporator in the water tank heat exchange system.

[0008] Preferably, the fireplace structure comprises a fireplace, and the fireplace is provided with a heat dissipation pipe, a flue gas recovery channel and a fireplace flue gas exhaust port. The flue gas generated during the combustion of the fireplace first heats indoor air through the heat dissipation pipe, and then is guided by a built-in flue gas exhaust fan, collected through the flue gas recovery channel and finally discharged to the outside through the fireplace flue gas exhaust port.

[0009] Preferably, the water tank heat exchange system comprises a water tank, and the water tank is provided with a fin heat exchanger connected with the flue gas exhaust pipeline, and the fin heat exchanger is provided with a flue gas outlet connected with the outdoor environment. The flue gas generated during the combustion of the fireplace is guided to the fin heat exchanger in the water tank along the flue gas exhaust pipeline, and in the fin heat exchanger, the flue gas exchanges heat with the water in the water tank to heat the water in the water tank, thereby preventing frost formation of the evaporator in a low temperature environment. The flue gas after heat exchange is finally discharged to the outside through the flue gas outlet.

[0010] Preferably, the fin heat exchanger is a continuously bent pipeline, and the pipeline of the fin heat exchanger is connected with the fireplace flue gas exhaust port and the flue gas outlet at both ends and continuous in the middle. The pipeline of the fin heat exchanger of the present application is a continuously winding pipeline, which is continuous and uninterrupted in the middle, can efficiently heat the water in the water pump and prevent frost formation of the evaporator in the water pump, thereby ensuring the working efficiency and stability of the heat pump.

[0011] As preferred, the heat pump circulation system comprises a condenser arranged in the room, the circulation cooling pipeline between the water tank and the condenser is a one-way channel, the water tank is provided with a compressor in the direction flowing to the condenser, and the condenser is provided with a throttling valve in the direction flowing to the water tank.

[0012] As preferred, the heat pump circulation system further comprises an evaporator in the water tank. The condensed refrigerant is processed by the throttling valve to reduce pressure and flows into the evaporator, the refrigerant exchanges heat with the hot water in the water tank in the evaporator, absorbs heat and reconverts into a gaseous state, and is sucked into the compressor, thereby forming a complete circulation process.

[0013] A high-efficiency heat pump anti-frosting circulation method using flue gas waste heat, used in the high-efficiency heat pump system using flue gas waste heat for anti-frosting, characterized by comprising the following steps,

[0014] Step a: the flue gas generated in the combustion process of the fireplace first heats the indoor air through the heat dissipation pipe, and then is guided by the built-in flue gas exhaust fan of the fireplace, collected through the flue gas recovery channel, and finally flows into the flue gas exhaust port of the fireplace and discharged.

[0015] Step b: the flue gas generated in the combustion process of the fireplace is guided to the fin heat exchanger in the water tank along the flue gas exhaust pipe, the flue gas exchanges heat with the water in the water tank in the fin heat exchanger, the water in the water tank is heated, the frosting phenomenon of the evaporator in the low-temperature environment is prevented, and the flue gas after heat exchange is finally discharged to the external environment through the flue gas outlet.

[0016] Step c: the refrigerant in the heat pump circulation system is sent into the compressor through the pipeline, converted into a high-temperature and high-pressure gas state after compression, and then the high-temperature and high-pressure gas enters the condenser to condense and release heat to heat the air in the room.

[0017] Step d: the condensed refrigerant is processed by the throttling valve to reduce pressure and flows into the evaporator, the refrigerant exchanges heat with the hot water in the water tank in the evaporator, absorbs heat and reconverts into a gaseous state, and is sucked into the compressor, thereby forming a complete circulation process.

[0018] Therefore, the high-efficiency heat pump system using flue gas waste heat for anti-frosting has the following advantages: the flue gas waste heat generated by the fireplace can be used to heat the heat pump evaporator, effectively preventing the evaporator from frosting, and the use of flue gas waste heat increases the temperature of the evaporator, improves the heating efficiency and heating capacity of the heat pump in a low-temperature environment, and is suitable for various combinations of fireplaces and heat pumps, achieving the goal of efficient and environmentally friendly heating BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a system structure diagram of a high-efficiency heat pump system using flue gas waste heat to prevent frosting.

[0020] Figure 2 is a three-dimensional structure schematic diagram of a fireplace structure in the application.

[0021] In the figure, the fireplace structure 1, the flue gas exhaust pipeline 2, the heat dissipation pipe 3, the flue gas recovery channel 4, the fireplace flue gas exhaust port 5, the water tank 6, the fin heat exchanger 7, the flue gas outlet 8, the circulating cooling pipeline 9, the condenser 10, the evaporator 11, the compressor 12, and the throttling valve 13. DETAILED DESCRIPTION

[0022] The technical solutions of the application will be further specifically described below by examples in combination with the drawings.

[0023] Example:

[0024] As shown in Figure 1 and 2 , a high-efficiency heat pump system using flue gas waste heat to prevent frosting includes a fireplace flue gas 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 flue gas exhaust system and the heat pump circulation system are installed indoors.

[0025] The fireplace flue gas exhaust system includes a fireplace structure 1, and the fireplace structure 1 is connected with the water tank heat exchange system through a flue gas exhaust pipeline 2; the fireplace structure 1 includes a fireplace, and the fireplace is provided with a heat dissipation pipe 3, a flue gas recovery channel 4, and a fireplace flue gas exhaust port 5.

[0026] The water tank heat exchange system includes a water tank 6, and the water tank 6 is provided with a fin heat exchanger 7 connected with the flue gas exhaust pipeline 2; the water tank 6 is further provided with an evaporator 11, and the fin heat exchanger 7 is provided with a flue gas outlet 8 connected with an outdoor environment; the fin heat exchanger 7 is a continuously bent pipeline, and the pipeline of the fin heat exchanger 7 is connected with the fireplace flue gas exhaust port 5 and the flue gas outlet 8 at two ends and continuously at the middle part.

[0027] The water tank heat exchange system and the heat pump circulation system are connected through a circulating cooling pipeline 9 in one-way circulation communication; the heat pump circulation system includes a condenser 10 installed indoors, the circulating cooling pipeline 9 between the water tank 6 and the condenser 10 is a one-way channel, the water tank 6 is provided with a compressor 12 in a direction flowing to the condenser 10, and the condenser 10 is provided with a throttling valve 13 in a direction flowing to the water tank 6.

[0028] The system working cycle steps of the application are as follows:

[0029] Step a, the flue gas generated in the combustion process of the fireplace is first heated by the heat dissipation pipe 3 with indoor air, and then guided by the built-in flue gas exhaust fan of the fireplace, collected through the flue gas recovery channel 4, and finally flows to the fireplace flue gas outlet 5 and is discharged.

[0030] Step b, the flue gas generated in the combustion process of the fireplace is guided along the flue gas duct 2 to the fin heat exchanger 7 in the water tank 6 through the fireplace flue gas outlet 5, and in the fin heat exchanger 7, the flue gas exchanges heat with the water in the water tank 6, realizing the heating of the water in the water tank 6, preventing the frosting phenomenon of the evaporator 11 in the low temperature environment, and the flue gas after heat exchange is finally discharged to the outside environment through the flue gas outlet 8.

[0031] Step c, the refrigerant in the heat pump circulation system is sent into the compressor 12 through the pipeline, 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 10 to be condensed, and releases heat to heat the air in the room.

[0032] Step d, the condensed refrigerant is processed by the pressure reducing valve 13, and flows into the evaporator 11, and the refrigerant exchanges heat with the hot water of the water tank 6 in the evaporator 11, and after absorbing heat, it is converted into a gaseous state again and is sucked into the compressor 12, thereby forming a complete circulation process.

[0033] The flue gas generated by the combustion in the fireplace is first heated by the heat dissipation pipe 3 to heat the indoor air, and then discharged from the flue gas outlet guided by the fan; the flue gas enters the fin heat exchanger 7 and 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 a 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 after pressure reduction through the pressure reducing valve 13, flows into the evaporator 11 in the water tank 6, absorbs the heat of the water in the water tank 6, and then gasifies into the compressor 12 again to form a cycle; through the present application, the waste heat of the flue gas generated by the fireplace is fully utilized, not only effectively preventing the frosting phenomenon of the heat pump evaporator 11 in the low temperature environment, but also improving the heating efficiency and overall performance of the heat pump, realizing the purpose of high-efficiency and energy-saving heating.

[0034] The present application utilizes the waste heat of the flue gas generated by the fireplace to heat the heat pump evaporator 11, effectively preventing the frosting of the evaporator 11; at the same time, the utilization of the waste heat of the flue gas improves the temperature of the evaporator 11, thereby improving the heating efficiency and heating capacity of the heat pump in the low temperature environment.

[0035] The present application combines the heat pump and the fireplace for heating, so that the heat is more evenly distributed in the room; the heat pump is responsible for converting the low-grade heat energy in the external environment into high-grade heat energy, combined with the heat generated by the combustion of the fireplace, on the one hand, the heating efficiency is improved, and on the other hand, the local temperature unevenness phenomenon caused by single heat source heating is reduced, thereby significantly improving the thermal comfort of the room.

[0036] The present application is suitable for various fireplace and heat pump combinations, ensuring stable operation in cold weather; makes full use of the flue gas waste heat generated by the fireplace combustion, reduces energy waste, and achieves the goal of efficient and environmentally friendly heating.

[0037] The specific embodiments described herein are merely illustrative of the principles of the application. Various modifications or changes in addition or substitution to the described specific embodiments can be made by those skilled in the art of the present application without departing from the spirit of the present application or exceeding the scope defined by the appended claims.

Claims

1. A high-efficiency heat pump system that utilizes waste heat from flue gas to prevent frosting, characterized in that: It includes a fireplace exhaust system, a water tank heat exchange system, and a heat pump circulation system. The fireplace exhaust system includes a fireplace structure, which is connected to the water tank heat exchange system via an exhaust pipe. The water tank heat exchange system and the heat pump circulation system are connected via a unidirectional circulating cooling pipe.

2. The high-efficiency heat pump system for preventing frost formation using waste heat from flue gas according to claim 1, characterized in that: The water tank heat exchange system is located outdoors, while the fireplace exhaust system and heat pump circulation system are installed indoors.

3. The high-efficiency heat pump system for preventing frost formation using waste heat from flue gas according to claim 1, characterized in that: The fireplace structure includes a fireplace, which is equipped with heat dissipation pipes, a flue gas recovery channel, and a fireplace exhaust port.

4. A high-efficiency heat pump system for preventing frost formation using waste heat from flue gas according to claim 1, characterized in that: The water tank heat exchange system includes a water tank, inside which is a finned heat exchanger connected to a flue gas duct, and the port of the finned heat exchanger is provided with a flue gas outlet connected to the outdoor environment.

5. A high-efficiency heat pump system for preventing frost formation using waste heat from flue gas according to claim 4, characterized in that: The finned heat exchanger is a continuously bent pipe, with both ends of the pipe connected to the fireplace exhaust port and flue gas outlet, and the middle section being continuous.

6. A high-efficiency heat pump system for preventing frost formation using waste heat from flue gas according to claim 1, characterized in that: The heat pump circulation system includes a condenser installed indoors, a one-way circulating cooling pipe between the water tank and the condenser, a compressor located in the direction of water tank flow towards the condenser, and a throttling valve located in the direction of condenser flow towards the water tank.

7. A high-efficiency heat pump system for preventing frost formation using waste heat from flue gas according to claim 6, characterized in that: The heat pump cycle system also includes an evaporator inside the water tank.

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