IIR document

Performance evaluation of CO2 HPWH system.

Number: 1171

Author(s) : NAWAZ K., SHEN B., ELATAR A., BAXTER D. van, ABDELAZIZ O.

Summary

A preliminary analysis has been conducted to analyze the performance of heat pump water heater which uses CO2 as refrigerant. The model to predict the performance was developed and calibrated based on the experimental data of an existing HPWH using CO2 refrigerant. The model was then used to run a parametric analysis where factors such as water supply temperature, water circulation rate, tank stratification, and condenser configurations were considered. The performance of a commercial CO2 system was compared with a similar system based on R-134a as the refrigerant. For comparable performance, the compressor size and the tube-in-tube heat exchanger (condenser/gas cooler) size have been compared for CO2 and R134a based systems. The impact of water circulation rate on the water temperature stratification in the tank, an essential requirement for higher performance for CO2 HPWH systems, has been investigated.

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Performance Evaluation of CO2 HPWH System

Pages: 6

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Details

  • Original title: Performance evaluation of CO2 HPWH system.
  • Record ID : 30027936
  • Languages: English
  • Subject: Technology
  • Source: 14th IIR-Gustav Lorentzen Conference on Natural Refrigerants(GL2020). Proceedings. Kyoto, Japon, December 7-9th 2020.
  • Publication date: 2020/12/07
  • DOI: http://dx.doi.org/10.18462/iir.gl.2020.1171

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