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Study on the LWT control schemes of a heat pump for hot water supply

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  • Choi, Jong Min

Abstract

Heat pump systems have been widely used in buildings and industries due to their high performance. In this study, a leaving water temperature control scheme has been proposed for a water-to-water heat pump for hot water supply. The study was focused on the following four schemes: (1) using an auxiliary electric heater, (2) varying compressor speed, (3) adjusting water flow rate, and (4) adding heat to the secondary fluid flow of the heat source. With schemes (2) and (3), the system showed higher performance than other schemes. However, scheme (2) could not attain the appropriate LWT at low EWT heat source conditions. For all EWT conditions, using schemes (3) and (4) enabled the system to reach an appropriate LWT. Scheme (4) can be adopted as the best technology to control LWT, because it is not easy to vary flow rate of the secondary fluid as in scheme (3).

Suggested Citation

  • Choi, Jong Min, 2013. "Study on the LWT control schemes of a heat pump for hot water supply," Renewable Energy, Elsevier, vol. 54(C), pages 20-25.
    • Handle: RePEc:eee:renene:v:54:y:2013:i:c:p:20-25
    DOI: 10.1016/j.renene.2012.09.031
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    References listed on IDEAS

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    1. Chua, K.J. & Chou, S.K. & Yang, W.M., 2010. "Advances in heat pump systems: A review," Applied Energy, Elsevier, vol. 87(12), pages 3611-3624, December.
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    1. Shin, Ji-Hyun & Cho, Young-Hum, 2024. "A variable water flow rate control method of hybrid geothermal heat pump systems," Renewable Energy, Elsevier, vol. 226(C).
    2. Kebai Li & Tianyi Ma & Guo Wei, 2018. "Robust Economic Control Decision Method of Uncertain System on Urban Domestic Water Supply," IJERPH, MDPI, vol. 15(4), pages 1-15, March.

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