Method and device for wastewater waste heat utilizing of heat pump water heater

Abstract

The invention discloses a method and device for wastewater waste heat utilizing of a heat pump water heater, and belongs to the technical field of engineering thermophysics and bathroom accessories. Through heat absorption of a refrigeration working medium and heat exchange between tap water with the low temperature and shower wastewater with the high temperature, waste heat in the shower wastewater is fully recycled to generate hot water for shower. Under the condition of insufficient wastewater quantity or blockage, in a prior technical scheme, an evaporator is prone to being frozen, and consequently, a system loses efficacy and is damaged. According to the technical scheme, heat transfer can be conducted between the tap water and the refrigeration working medium, through convective heattransfer, the tap water compensates the heat absorbed by the refrigeration working medium to avoid freezing of the evaporator, the problem existing in the prior technical scheme is solved, and the hot water temperature in the shower process is more stable and easy to adjust while the system reliability is guaranteed.

Description

technical field [0001] The invention discloses a method and a device for using waste water waste heat in a heat pump water heater, belonging to the technical fields of engineering thermophysics and sanitary ware. Background technique [0002] The prior heat pump hot water device using the waste heat of shower waste water was first invented by Dang Kunxuan and Lu Yingmei and submitted an invention patent application to the China Patent Office on July 26, 1996. The application was authorized (name: a production Method and device for using hot water in shower, invention patent number: ZL96118737.9). The technical solution of the invention describes a heat pump water heater to fully recover and utilize the waste heat in the shower wastewater by absorbing heat from the refrigerant to the shower wastewater and exchanging heat between the lower-temperature tap water and the higher-temperature shower wastewater . Thereafter, on the basis of the method for recovering and utilizing ...

AI Technical Summary

Problems solved by technology

[0003] The direct heat source in the evaporator is the waste hot water recovered by the water pump for bathing. The water volume and water temperature are not stable, and the waste water may be blocked due to dirt and hair accumulation, water pump failure, etc.

When the amount of wastewater is insufficient or the wastewater channel is blocked, the evaporator will be frosted or even cracked, resulting in failures of the entire system that cannot be easily eliminated by the user or even damage to the equipment

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