Experimental Study on the Feasibility of Quick Startup of Instant Heat Pump Water Heaters Based on Active Control of Heat Sink Flow Step

Author:

Ju Fujun123,Mu Zhenzhen2,Li Guozhu13,Hou Lihao2,Fan Xiaowei2,Liu Hongtao2,Liu Qinglei2,Liu Wenbo2

Affiliation:

1. State Key Laboratory of Building Safety and Environment, Beijing 100013, China

2. School of Energy and Environment, Zhongyuan University of Technology, Zhengzhou 450007, China

3. National Engineering Research Center of Building Technology, Beijing 100013, China

Abstract

The influence of flow step ratio (FSR) on the startup characteristics of instant heat pump water heaters (IHPWHs) with natural mixture M (R744/R290 (12/88)) under nominal conditions was studied experimentally to verify the feasibility of a new quick startup method. The results show that the FSR had a marked effect on the startup time of system performance parameters. Under the optimal FSR of 0.6, the shortest system startup time and available hot water supply time were 700 s and 250 s, respectively, which were markedly shorter than those in the conventional startup. Therefore, rapid startup of the system and rapid production of usable domestic hot water can be realized by controlling the flow step. The influence of flow step on the variation trend of system performance parameters was obviously different, and there was no slow warming section for the heat sink outlet temperature (HSOT) under three FSRs. The HSOT, heating capacity, and high pressure side pressures had the maximum values in the quick startup, and the maximum values were obviously affected by the FSR. The FSR had no marked effect on the minimum suction pressure. The refrigerant pressures and refrigerant temperatures fluctuated markedly in both rapid and conventional starts.

Funder

Opening Funds of the State Key Laboratory of Building Safety and Built Environment and National Engineering Research Center of Building Technology

Henan Youth Science Foundation Project

Henan Province Science and Technology Project

Zhongyuan University of Technology Youth Talent Innovation Ability Fund Project

Publisher

MDPI AG

Subject

Energy (miscellaneous),Energy Engineering and Power Technology,Renewable Energy, Sustainability and the Environment,Electrical and Electronic Engineering,Control and Optimization,Engineering (miscellaneous),Building and Construction

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