Compound air source heat pump heating system and circulating method

Abstract

The invention discloses a compound air source heat pump heating system and a circulating method. The warming by firing coals in winter, as an important pollution source, causes bad air pollution, so that the change of warming modes and the reduction or even forbidding of coal-fired boilers are problems urgent to solve in present environmental treatment. The compound air source heat pump heating system comprises a R744 transcritical compressor (1) and a R134a compressor (2); the R744 transcritical compressor is connected with a gas cooler (3); the gas cooler is connected with a constant-pressure valve (13); the constant-pressure valve is connected with an evaporation condenser (5); the evaporation condenser is connected with one end of a reheater (6); the reheater is connected with a R744 high-pressure liquid storer (7); the R744 high-pressure liquid storer is connected with a medium pressure system (8); the medium pressure system is connected with an air cooling evaporator (9); and the air cooling evaporator is connected with the other side of the reheater. The compound air source heat pump heating system is applied to heating of various civil and commercial buildings.

Description

[0001] Technical field:

[0002] The invention relates to a composite air source heat pump heating system and a circulation method.

[0003] Background technique:

[0004] Burning coal for heating in winter is an important source of pollution, causing serious air pollution. Therefore, changing the heating method, reducing or even banning coal-fired boilers is an urgent problem to be solved in current environmental governance. Low-carbon and environmentally friendly heating methods have also attracted widespread attention.

[0005] Carbon dioxide and R134a, as the heat pump cycle working fluid, are both environmentally friendly working fluids, which can reduce the greenhouse effect and the attenuation of the ozone layer, and the operating cost is very low. Among them, carbon dioxide has a large cooling capacity per unit volume and excellent thermal conductivity. The higher exhaust temperature and larger temperature glide of the gas cooler match the temperature rise process of ...

Examples

Embodiment 1

[0026] A composite air source heat pump heating system, which consists of: R744 transcritical compressor 1 and R134a compressor 2, the R744 transcritical compressor is connected to a gas cooler 3, and the gas cooler is connected to a constant pressure The valve 13 is connected, the constant pressure valve is connected with the evaporative condenser 5, the evaporative condenser is connected with one end of the regenerator 6, the regenerator is connected with the R744 high-pressure liquid receiver 7, and the described The R744 high-pressure accumulator is connected to the medium-pressure system 8, the medium-pressure system is connected to the air-cooled evaporator 9, the air-cooled evaporator is connected to the other side of the regenerator, and the other side of the regenerator is The side is also connected with the R744 gas-liquid separator 10, and the R744 gas-liquid separator is connected with the R744 transcritical compressor.

Embodiment 2

[0028] According to the composite air source heat pump heating system described in Embodiment 1, the R134a compressor is connected to the condenser 4, the condenser is connected to the R134a liquid storage 11, and the R134a liquid storage is connected to the electronic expansion The valve 14 is connected, the electronic expansion valve is connected with the other side of the evaporative condenser, and the other side of the evaporative condenser is also connected with the R134a compressor 2 .

Embodiment 3

[0030] According to the composite air source heat pump heating system described in Embodiment 1 or 2, the R744 transcritical compressor is also connected to the defrosting valve 12, and the defrosting valve is connected to the air-cooled evaporator.

[0001] Technical field:

[0002] The invention relates to a composite air source heat pump heating system and a circulation method.

[0003] Background technique:

[0004] Burning coal for heating in winter is an important source of pollution, causing serious air pollution. Therefore, changing the heating method, reducing or even banning coal-fired boilers is an urgent problem to be solved in current environmental governance. Low-carbon and environmentally friendly heating methods have also attracted widespread attention.

[0005] Carbon dioxide and R134a, as the heat pump cycle working fluid, are both environmentally friendly working fluids, which can reduce the greenhouse effect and the attenuation of the ozone layer, and the operating cost is very low. Among them, carbon dioxide has a large cooling capacity per unit volume and excellent thermal conductivity. The higher exhaust temperature and larger temperature glide of the gas cooler match the temperature rise process of ...

Examples

Embodiment 1

[0026] A composite air source heat pump heating system, which consists of: R744 transcritical compressor 1 and R134a compressor 2, the R744 transcritical compressor is connected to a gas cooler 3, and the gas cooler is connected to a constant pressure The valve 13 is connected, the constant pressure valve is connected with the evaporative condenser 5, the evaporative condenser is connected with one end of the regenerator 6, the regenerator is connected with the R744 high-pressure liquid receiver 7, and the described The R744 high-pressure accumulator is connected to the medium-pressure system 8, the medium-pressure system is connected to the air-cooled evaporator 9, the air-cooled evaporator is connected to the other side of the regenerator, and the other side of the regenerator is The side is also connected with the R744 gas-liquid separator 10, and the R744 gas-liquid separator is connected with the R744 transcritical compressor.

Embodiment 2

[0028] According to the composite air source heat pump heating system described in Embodiment 1, the R134a compressor is connected to the condenser 4, the condenser is connected to the R134a liquid storage 11, and the R134a liquid storage is connected to the electronic expansion The valve 14 is connected, the electronic expansion valve is connected with the other side of the evaporative condenser, and the other side of the evaporative condenser is also connected with the R134a compressor 2 .

Embodiment 3

[0030] According to the composite air source heat pump heating system described in Embodiment 1 or 2, the R744 transcritical compressor is also connected to the defrosting valve 12, and the defrosting valve is connected to the air-cooled evaporator.

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