Heat pump pre-cooling waste heat recovery system before throttling of integrated heat pump water heater

Abstract

The invention relates to a heat pump pre-cooling waste heat recovery system before throttling of an integrated heat pump water heater, which includes a condenser, a throttle valve and an evaporator. The output port of the device is connected with the input port of the condensing pipe added in the evaporator through the pipeline, the output port of the condensing pipe added in the evaporator is connected with the input port of the throttle valve through the pipeline, and the output port of the throttle valve is connected through the pipeline It is connected with the input port of the evaporation tube of the evaporator. The invention can effectively reduce the temperature of the refrigerant before throttling, improve the evaporation efficiency of the refrigerant after throttling, and recover the waste heat of the condensed refrigerant through the evaporator, thereby reducing the heat loss of the system. These two advantages ensure that the heat pump water heater always maintains an ideal energy efficiency ratio during the entire process of water temperature rise, and the drop rate of the COP value is significantly reduced.

Description

[0001] technical field [0002] The invention relates to a heat pump circulation system of an integrated heat pump water heater, in particular to a precooling waste heat recovery system of an integrated heat pump water heater before throttling of the heat pump. [0003] Background technique [0004] A heat pump water heater is a device that uses the reverse Carnot principle to transfer heat from a low-temperature object to high-temperature water through a medium. The integrated heat pump water heater integrates the compressor, evaporator, condenser, and throttle valve into one body. Compared with the split type, it not only facilitates installation and saves space, avoids the risk of fluorine leakage at the split installation interface, but also has low noise and is easy to use. At present, the outlet water temperature of the integrated heat pump water heater is required to reach about 60 degrees Celsius. Most heat pump water heaters use R134a or R417 refrigerant. When the...

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Problems solved by technology

[0005] At present, the energy efficiency ratio (COP value) of the integrated heat pump water heater is very high when the water temperature is low (such as around 20 degrees Celsius), which can reach about 4.5, but the water temperature is from The average energy efficiency ratio of the whole process of 10-60 degrees Celsius is difficult to break through 3.8

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