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Performance optimization of CO2 heat pump water heater.

Author(s) : NAWAZ K., SHEN B., ELATAR A., et al.

Type of article: Article, IJR article

Summary

A preliminary analysis was conducted to analyze the performance of a heat pump water heater (HPWH) that uses CO2 as the refrigerant. A model to predict the performance was developed and calibrated based on the experimental data for an existing HPWH using a CO2 refrigerant. The calibrated model was then used to run a parametric analysis in which factors such as water supply temperature, water circulation rate, tank stratification, and condenser configuration were considered. The performance of a commercial CO2 system was compared with that of a similar system using R-134a as the refrigerant. It was found that CO2 HPWH performance was comparable to that of an R-134a HPWH, more so for a separated gas cooler configuration. For comparable performance, the compressor size and the tube-in-tube heat exchanger (condenser/gas cooler) size were compared for CO2- and R-134a-based systems. The impact of the water circulation rate on the water temperature stratification in the tank, an essential requirement for higher performance for CO2 HPWH systems was also investigated.

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Pages: 213-228

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Details

  • Original title: Performance optimization of CO2 heat pump water heater.
  • Record ID : 30022854
  • Languages: English
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 85
  • Publication date: 2018/01
  • DOI: http://dx.doi.org/10.1016/j.ijrefrig.2017.09.027

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