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

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  • Fujun Ju

    (State Key Laboratory of Building Safety and Environment, Beijing 100013, China
    School of Energy and Environment, Zhongyuan University of Technology, Zhengzhou 450007, China
    National Engineering Research Center of Building Technology, 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
    National Engineering Research Center of Building Technology, 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)

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.

Suggested Citation

  • Fujun Ju & Zhenzhen Mu & Guozhu Li & Lihao Hou & Xiaowei Fan & Hongtao Liu & Qinglei Liu & Wenbo Liu, 2023. "Experimental Study on the Feasibility of Quick Startup of Instant Heat Pump Water Heaters Based on Active Control of Heat Sink Flow Step," Energies, MDPI, vol. 16(17), pages 1-15, August.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:17:p:6145-:d:1223770
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    References listed on IDEAS

    as
    1. Atasoy, Erkan & Çetin, Barbaros & Bayer, Özgür, 2022. "Experiment-based optimization of an energy-efficient heat pump integrated water heater for household appliances," Energy, Elsevier, vol. 245(C).
    2. Zhongchao Zhao & Yanrui Zhang & Haojun Mi & Yimeng Zhou & Yong Zhang, 2018. "Experimental Research of a Water-Source Heat Pump Water Heater System," Energies, MDPI, vol. 11(5), pages 1-13, May.
    3. Qu, Minglu & Yan, Xufeng & Wang, Haiyang & Hei, Yingxiao & Liu, Hongzhi & Li, Zhao, 2022. "Energy, exergy, economic and environmental analysis of photovoltaic/thermal integrated water source heat pump water heater," Renewable Energy, Elsevier, vol. 194(C), pages 1084-1097.
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