Variable-concentration directly-heated type heat pump water heater with flash evaporators and working method thereof

Abstract

The invention provides a variable-concentration directly-heated type heat pump water heater with flash evaporators and a working method thereof. The variable-concentration directly-heated type heat pump water heater with the flash evaporators comprises a main circulation loop, an air supplementing branch and a concentration adjusting branch, and the main circulation loop is formed by connecting acompressor, a condenser, a high-pressure liquid storage device, a subcooler, a first expansion valve, the flash evaporator, a first stop valve, a third stop valve, a second expansion valve and an evaporator; the air supplementing branch is provided with the flash evaporator and a second stop valve which are connected in sequence; and the concentration adjusting branch is formed by connecting a working medium supplementing expansion valve, a component separation and working medium storage tank, an air supplementing concentration adjusting valve and a liquid supplementing concentration adjustingvalve. According to the variable-concentration directly-heated type heat pump water heater, based on the principle of advantage complementation, enhanced vapor injection and working medium concentration adjusting technologies are comprehensively applied to the heat pump water heater, the low-temperature performance and annual comprehensive energy efficiency of the heat pump water heater can be remarkably improved, meanwhile, the applicable temperature range of the heat pump water heater is obviously widened, and the heat pump water heater further has the advantages of being simple in rectification structure, high in component separation efficiency, safe, reliable and the like.

Description

technical field [0001] The invention relates to the technical field of heat pump water heaters, in particular to a variable concentration direct heat heat pump water heater with a flash evaporator and a working method thereof. Background technique [0002] my country's building energy consumption is an important part of the total energy consumption of the society, among which the energy consumption of domestic hot water occupies a large share in the energy consumption of civil buildings and industrial buildings. Although my country's per capita domestic hot water energy consumption is significantly lower than that of developed countries and regions such as the United States, Japan, and Western Europe, the per capita domestic hot water energy consumption and domestic hot water demand in China will increase with the continuous improvement of my country's economic level. increase rapidly. However, the energy crisis and environmental problems have become the main factors hinderi...

AI Technical Summary

Problems solved by technology

Due to the serious attenuation of heating capacity and system energy efficiency, excessive pressure ratio, and high exhaust temperature in low-temperature environments, the low-temperature applicability of conventional air-source heat pump water heaters is poor.

As a result, conventional air source heat pump water heaters can be widely used in southern regions with high outdoor ambient temperature in winter, but it is difficult to achieve large-scale promotion in northern regions (severe cold and cold regions) with low outdoor ambient temperature in winter

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