Direct heating type heat pump water heater with adjustable concentration and wide temperature zone and working method thereof

Abstract

The invention provides a direct heating type heat pump water heater with adjustable concentration and a wide temperature zone and a working method thereof. The water heater includes a main circulationloop, an air supplement branch and a concentration adjustment branch. The main circulation loop is provided with a compressor, a condenser, a high-pressure liquid accumulator, a subcooler, an economizer, a first expansion valve and an evaporator which are sequentially connected. The air supplement branch is provided with a second expansion valve, an economizer and a stop valve which are connectedsequentially. The concentration adjustment branch is composed of a working medium supplementary expansion valve, a component separation and working medium storage tank, an air supplement concentration regulating valve and a liquid supplement concentration regulating valve. The air jet enthalpy increase and working medium concentration adjustment technologies are comprehensively adopted, the significant improvement in the low-temperature performance of the heat pump water heater, significant expansion of the applicable temperature zone, and significant improvement in the overall energy efficiency throughout the year are simultaneously achieved. In addition, the water heater further has many advantages of simple distillation structure, high component separation efficiency, simple control, safety and reliability.

Description

technical field [0001] The invention relates to the technical field of heat pump water heaters, in particular to a wide temperature zone direct heat heat pump water heater with adjustable concentration and a working method thereof. Background technique [0002] The energy consumption of building operation in my country accounts for about 20% of the total energy consumption of the society, and the energy consumption of domestic hot water is the fourth largest contributor after heating energy consumption, air conditioning energy consumption, and lighting energy consumption. With economic development and improvement of living standards, the demand for domestic hot water will continue to grow rapidly. Therefore, reducing the energy consumption of domestic hot water is an important way to achieve the goal of energy saving and emission reduction. [0003] Compared with traditional water heaters (gas water heaters, electric water heaters and solar water heaters), heat pump water h...

AI Technical Summary

Problems solved by technology

As the most widely promoted and used heat pump water heater, although the air source heat pump water heater can achieve good application results in the southern region where the outdoor ambient temperature is high in winter, it is difficult to obtain large-scale application in the northern region where the outdoor ambient temperature is low in winter. Popularization and application, the main reason is that air source heat pump water heaters will have many problems such as serious attenuation of heating capacity and system energy efficiency, excessive pressure ratio, and excessive exhaust temperature in low temperature environments.

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