A high-efficiency large temperature rise single-stage throttling intercooling heat pump water heater

Abstract

The invention discloses an efficient large-temperature-rise single-stage-throttling intercooling heat pump water heater. An outlet of a high-pressure compressor communicates with a cooling agent inlet of a first condenser. One path of a cooling agent outlet of the first condenser communicates with a cooling fluid inlet of a subcooler through a first throttling device, and the other path of the cooling agent outlet of the first condenser communicates with a subcooled liquid inlet of the subcooler. A gas outlet of the subcooler communicates with an inlet of the high-pressure compressor. A liquid outlet of the subcooler communicates with an inlet of a low-pressure compressor through a third throttling device, a check valve, a second throttling device and an evaporator. An outlet of the low-pressure compressor is divided into two streams; one stream of the outlet communicates with a cooling agent inlet of a second condenser through a first stop valve, and a cooling agent outlet of the second condenser communicates with an inlet of the second throttling device; the other stream of the outlet communicates with a gas inlet of the subcooler through a second stop valve. A main cold water inlet communicates with the second condenser and the first condenser through a water pump. A hot water outlet of the first condenser serves as a main hot water outlet. According to the efficient large-temperature-rise single-stage-throttling intercooling heat pump water heater, the energy consumption is effectively reduced, the energy efficiency is improved and the working range is enlarged.

Description

technical field [0001] The invention relates to the field of water heaters, in particular to a heat pump water heater. Background technique [0002] The heat pump water heater can absorb the heat energy in the environment driven by electric energy and turn it into high-temperature heat energy for use. Its COP can reach about 4 in normal use. As environmental and energy problems are becoming more and more serious, especially the hazards of smog, heat pump water heaters have become a research hotspot in related fields, and are widely used in hotels, hospitals, schools, domestic water and even industrial production. However, the heat pump water heater still needs to consume a large amount of electric energy after all, so improving its efficiency has become a focus of improvement. In addition, under the low temperature in winter in northern my country, the efficiency of ordinary heat pump water heaters drops sharply or even fails to operate, which seriously restricts its energy...

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the shortcomings of existing heat pump water heaters, such as high energy consumption, low energy efficiency, and insufficient working range, the present invention provides a high-efficiency large temperature rise single-stage section that can effectively reduce energy consumption, improve energy efficiency, and expand the working range. Flow intercooling heat pump water heater

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