Cascade heating multi-mode coupled multi-water-tank dual compression heat pump water heater

Abstract

The invention discloses a cascade heating multi-mode coupled multi-water-tank dual compression heat pump water heater. The water heater comprises an evaporator, a first compressor, a first stop valve,a second stop valve, a second compressor, a first expansion valve, a second expansion valve, a heat regenerator, a third expansion valve, a second condenser, a first condenser, a water pump, a thirdstop valve, a fourth stop valve, a fifth stop valve, a sixth stop valve, a seventh stop valve, an eighth stop valve, a ninth stop valve, a tenth stop valve, a flow adjusting valve, a first water tank,a second water tank, a third water tank, a first water mixing valve, a second water mixing valve, a third water mixing valve and an eleventh stop valve. The two-stage compression two-stage throttlingtype heat pump circulation is adopted for carrying out cascade heating on the multiple water tanks with different set temperatures through multi-mode switching, the water tanks with different set temperatures are separately heated by switching the different stop valves in different coupled modes, and water is taken out from the water tanks with different set temperatures. The cascade heating multi-mode coupled multi-water-tank dual compression heat pump water heater is high in heat production efficiency.

Description

technical field [0001] The invention belongs to the field of heat pumps and relates to a heat pump water heater. Background technique [0002] With the gradual recognition of the market and the support of national policies, air source heat pump water heaters have been widely promoted, and users pay special attention to water comfort and energy saving. However, the heat pump water heater still needs to consume a large amount of electric energy, and the efficiency is not ideal enough, so improving its electric efficiency is an important improvement direction. Existing heat pump water heaters can only heat water to a very high temperature and store it in the water tank. When users use hot water at a lower temperature, they can only use it after mixing hot water with high temperature from the water tank and mixing it with cold water. This process wastes the available energy in the hot water As a result, large entropy production is generated, energy utilization is reduced, and...

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the low heat production efficiency of existing water heaters, the present invention provides a multi-tank dual-compression heat pump water heater with cascade heating and multi-mode coupling with high heat production efficiency.

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