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Performance evaluation of CO2 heat pump-driven liquid desiccant air conditioning system in hot and humid climates.

Number: 0610

Author(s) : REDDY Y. S. K., GURUCHETHAN A. M., MAIYA M. P., HAFNER A.

Summary

Being a natural and eco-friendly refrigerant, CO2 is receiving great attention recently. CO2 transcritical refrigeration system coupled to a liquid desiccant air conditioning system (LDAS) can be a promising solution for air conditioning applications in hot and humid climates. The drawback of providing limited heat for solution regeneration in hot and humid climates using a conventional refrigerant heat pump can be overcome by using a CO2 transcritical heat pump. The energy-saving potential of the proposed hybrid system (HS) is analyzed for different ambient conditions and compared with a conventional chilled water air conditioning system (CS). The indirect contact type (membrane-based) dehumidifier and regenerator are considered in this study. Dehumidifier performance is found to be improved with an increase in latent load and thus reduces the LT evaporator load accordingly. At higher ambient temperature and humidity ratio (35 °C and 0.025 kg/kg), COP improvement of 38% is achieved for HS compared to CS. At ambient humidity ratio more than 0.021 kg/kg or ambient temperature below 34 °C, available heat at optimum gas cooler pressure is not adequate for solution regeneration and thus gas cooler has to be operated at higher than optimum pressures.

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Details

  • Original title: Performance evaluation of CO2 heat pump-driven liquid desiccant air conditioning system in hot and humid climates.
  • Record ID : 30031868
  • Languages: English
  • Subject: Technology
  • Source: Proceedings of the 26th IIR International Congress of Refrigeration: Paris , France, August 21-25, 2023.
  • Publication date: 2023/08/21
  • DOI: http://dx.doi.org/10.18462/iir.icr.2023.0610

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