Semi-open and heat-returning type air compression circulation heat pump water heater

Abstract

The invention relates to a semi-open and heat-returning type air compression circulation heat pump water heater. The heat pump water heater comprises an air compressor, a heating water tank, a heat returning device and an air expansion machine. The air compressor is communicated with the air inlet end of the heating water tank, the heat returning device is communicated with the air outlet end of the heating water tank, the air outlet end of the heat returning device is directly communicated with the outside environment, a circulation loop is formed between the air expansion machine and the heat returning device in a communicated mode, and the air expansion machine and the air compressor are connected through a transmission coupler. Compared with the prior art, the heat pump water heater is designed based on the reverse Brayton cycle basic principle, a heat pump unit absorbs heat from the environment air in the compressing, heat releasing, expanding and heat absorbing processes and transmits the heat to high-temperature water. Air directly serves as cycle working fluid in the heat pump and is free of damage, pollution and preparing cost, a non-closed structure can be adopted in the using process, the cycle working fluid can be directly obtained from the environment through a cryogenic heat exchanger part, the leakage of the working fluid does not need to be taken into consideration, and the frosting problem under the low-temperature work condition does not exist.

Description

technical field [0001] The invention relates to a heat pump water heater, in particular to a heat pump water heater of a semi-open heat recovery type air compression cycle. Background technique [0002] The heat pump water heaters currently used in the market are mainly vapor compression heat pump water heaters. This type of water heater uses the reverse Carnot cycle principle to transfer heat from a low-temperature environment to high-temperature water through a medium, and its structure must adopt a closed structure. . Due to its fully enclosed structure, the vapor compression heat pump water heater has heat exchangers in both high and low temperature sections, and during the working process, the low temperature heat exchangers in contact with the environment are actually continuously absorbing heat and cooling. When the outside temperature is low, frosting will occur when the moisture in the air contacts the outdoor heat exchanger of the heat pump water heater. The effi...

AI Technical Summary

Problems solved by technology

The above two problems have hindered the development of vapor compression heat pump water heaters and their popularization and application in larger areas

Images