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System optimization of CO2 heat pump water heater based on economy.

Number: pap. ID125

Author(s) : ZHANG F. Z., JIANG P. X., ZHU Y. H., et al.

Summary

As a substitute refrigerant carbon dioxide may be one of the most promising candidates in future. At present the coefficient of performance (COP) is used as a key system evaluation index which is influenced by the compressor discharge pressure and evaporation temperature. Heat rejection pressure optimization is becoming a research focus . Not only the COP but also the heat transfer area of gas cooler of a transcritical CO2 system are influenced by the compressor discharge pressure. The initial investment may be expensive for the system operating at an optimum high side pressure which maximizing COP because the heat transfer area of evaporator and gas cooler is related to the temperature difference, discharge pressure and so on. The initial cost of heat exchangers should be considered in system optimum. In this study, a system model and computer simulation have been developed to optimize the CO2 heat pump water heater based on economy. The results indicated there exists an optimum operating pressure where the system yields the minimum total cost while COPH decreases monotonically with the compressor discharge pressure.

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Pages: 7 p.

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Details

  • Original title: System optimization of CO2 heat pump water heater based on economy.
  • Record ID : 30012515
  • Languages: English
  • Source: 11th IIR Gustav Lorentzen Conference on Natural Refrigerants (GL2014). Proceedings. Hangzhou, China, August 31-September 2, 2014.
  • Publication date: 2014/08/02

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