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Ammonia-liquid desiccant based hybrid air-conditioning system.


The combination of a vapour-compression system and a liquid desiccant (LD) system is the hybrid air-conditioning system (HACS) which can be energy efficient and environmental friendly. The HACS has received considerable attention due to its inherent ability to use low-grade thermal energy and reduce the latent cooling load. These systems have the ability to provide the required humidity and temperature for human comfort, while reducing the electrical energy requirement compared to a vapour-compression system alone. This paper presents the simulation results of a HACS, working with ammonia refrigerant and calcium chloride LD. The capacity of the ammonia compressor selected is 42.5 kW with an evaporator temperature of 15°C and condenser temperature of 50°C. As the evaporator temperature is increased from 7.2°C of conventional air conditioner to 15°C, the COP of HACS increases by 35%. The process air is cooled and dehumidified in the absorber. The heat rejected from the condenser is used to regenerate the LD in the regenerator. The absorber and regenerator used incorporate a large heat and mass transfer area and work without any carryover of LD. The simulation is carried out using MATHCAD software.

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Pages: 2007-2


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  • Original title: Ammonia-liquid desiccant based hybrid air-conditioning system.
  • Record ID : 2007-2240
  • Languages: English
  • Source: Ammonia Refrigeration Technology for Today and Tomorrow.
  • Publication date: 2007/04/19


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