Application of Liquid Desiccant System

  • Xiaohua Liu
  • Yi Jiang


Liquid desiccant air-conditioning systems have developed quickly in recent years in China. Processed air can be dehumidified and cooled in summer, and humidified and heated in winter using liquid desiccant. Low-grade heat can be utilized to regenerate liquid desiccant, such as exhaust heat from condenser of heat pump, hot water. The operating principle of heat pump-driven-type as well as heat-driven-type outdoor air processor is analyzed. The COPair of the heat pump (or power)-driven-type outdoor air processor can be as high as 5.0 both in summer and in winter operating conditions. The COPair of the hot water-driven type (65 ~ 80 °C) is 1.19 and 0.93, respectively, using evaporative indoor exhaust air or cooling water to cool the dehumidification process. Liquid desiccant air processor-based temperature- and humidity-independent control air-conditioning system can save 20 ~ 30 % operating energy, compared with the conventional air-conditioning system.


Humidity Ratio Total Heat Exchanger Total Heat Recovery Liquid Desiccant Direct Contact Heat Exchanger 
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Copyright information

© Springer-Verlag London 2014

Authors and Affiliations

  1. 1.Department of Building ScienceTsinghua UniversityBeijingPeople’s Republic of China

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