A heat pump air-conditioning system with supplementary air and enthalpy increase to improve the heat transfer performance of the heat exchanger

Abstract

The invention discloses an air-supplementing and enthalpy-increasing heat pump air-conditioning system for improving the heat exchange performance of the heat exchanger, comprising an air-supplementing and enthalpy-increasing compressor, a four-way valve, an outdoor heat exchanger, an indoor heat exchanger, and a gas-liquid separator , Two-way spiral flash evaporator, the side wall of the upper cylinder of the two-way spiral flash evaporator is provided with an outlet pipe, and the side wall of the lower cylinder is provided with a first refrigerant inlet and outlet pipe and a second refrigerant inlet and outlet pipe extending to the inner cavity of the cylinder; The gas pipe is connected to the first solenoid valve and the gas supply port of the gas supplement and enthalpy increasing compressor in sequence, and is also connected to the second solenoid valve and the gas-liquid separator in sequence, and the first refrigerant inlet and outlet pipes are connected to the first expansion valve and the outdoor side heat exchanger in sequence. The second refrigerant inlet and outlet pipes are sequentially connected to the second expansion valve and the indoor heat exchanger. The invention can realize not only heating and air replenishment but also high-temperature refrigeration air replenishment. In the normal temperature refrigeration working condition without air replenishment, the flash evaporator is used as a gas-liquid separator, which reduces the ratio of refrigerant gas at the inlet of the heat exchanger and improves the efficiency of the exchange rate. Heat transfer performance of the heat exchanger.

Description

technical field [0001] The invention relates to an air-conditioning system for increasing enthalpy by supplementing air, in particular to a heat pump air-conditioning system for increasing enthalpy by supplementing air, which can improve the uniformity of refrigerant distribution and the heat exchange efficiency of heat exchangers when the air is not supplemented. Background technique [0002] Existing heat pump air-conditioning systems operate in low-temperature environments, and there are still problems such as attenuation of heating capacity, reduced heating efficiency, and unreliable system operation due to elevated compressor exhaust temperatures, which limits the popularization and use of heat pump air conditioners in cold northern regions. Due to its good low-temperature adaptability, the air-supplementing and enthalpy-increasing heat pump air-conditioning system has been gradually applied to low-temperature household air conditioners, automobile air conditioners and o...

AI Technical Summary

Problems solved by technology

When cooling, the flash evaporator is bypassed, and the refrigerant directly enters the evaporator for evaporation and heat exchange after throttling. However, due to the uneven distribution of refrigerant at the inlet of the micro-channel heat exchanger and the existence of gaseous refrigerant, the heat transfer efficiency of the heat exchanger is reduced , the performance of the air conditioning system degrades

[0005] Moreover, increasing enthalpy by replenishing air can not only improve the low-temperature heating performance of the heat pump air-conditioning system, but also improve the high-temperature cooling performance of the air-conditioning system. It involves the switching of cooling / heating modes. At this time, to ensure the one-way flow of the flash evaporator, at least four additional solenoid valves are required for control, which increases the complexity of the system.

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