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

Fujun Ju (), Zhenzhen Mu, Guozhu Li, Lihao Hou, Xiaowei Fan, Hongtao Liu, Qinglei Liu and Wenbo Liu
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Fujun Ju: State Key Laboratory of Building Safety and Environment, Beijing 100013, China
Zhenzhen Mu: School of Energy and Environment, Zhongyuan University of Technology, Zhengzhou 450007, China
Guozhu Li: State Key Laboratory of Building Safety and Environment, Beijing 100013, China
Lihao Hou: School of Energy and Environment, Zhongyuan University of Technology, Zhengzhou 450007, China
Xiaowei Fan: School of Energy and Environment, Zhongyuan University of Technology, Zhengzhou 450007, China
Hongtao Liu: School of Energy and Environment, Zhongyuan University of Technology, Zhengzhou 450007, China
Qinglei Liu: School of Energy and Environment, Zhongyuan University of Technology, Zhengzhou 450007, China
Wenbo Liu: School of Energy and Environment, Zhongyuan University of Technology, Zhengzhou 450007, China

Energies, 2023, vol. 16, issue 17, 1-15

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.

Keywords: quick startup; startup characteristics; instant heat pump water heater; R744/R290; natural zeotropic refrigerant (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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