Performance study on solar assisted heat pump water heater using CO2 in a transcritical cycle

M. Raisul Islam, K. Sumathy, J. Gong, Samee Ullah Khan

Research output: Contribution to journalArticle

8 Scopus citations


This study reports the numerical analyses of a CO2 transcritical cycle on solar assisted heat pump water heating system in which evacuated tube U-pipe solar collector is utilized as an evaporator. This simulation model can predict operating characteristics for moderate meteorological conditions of North Dakota. The main purpose of this work is to simulate the overall performance of the heat pump cycle by varying compressor speed. From the analysis the coefficient of performance (COP) value is predicted from 1.5 – 2.8 with three different average solar insolation. The results showed that the performance of the system significantly influenced by the compressor speed and solar irradiation. This study also calculated the instantaneous collector efficiency and found in the range of 50 – 55%.

Original languageEnglish (US)
Article number720
Pages (from-to)1421-1425
Number of pages5
JournalRenewable Energy and Power Quality Journal
Issue number10
StatePublished - Apr 2012


All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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