Energy analysis of innovative dedicated outdoor air system with liquid desiccant

Pao Yue-kong Library Electronic Theses Database

Energy analysis of innovative dedicated outdoor air system with liquid desiccant

 

Author: Kang, Houmin
Title: Energy analysis of innovative dedicated outdoor air system with liquid desiccant
Degree: M.Eng.
Year: 2010
Subject: Hong Kong Polytechnic University -- Dissertations
Air conditioning -- Design and construction.
Air conditioning -- Energy consumption
Department: Dept. of Building Services Engineering
Pages: vii, 64 leaves : ill. ; 31 cm.
InnoPac Record: http://library.polyu.edu.hk/record=b2356374
URI: http://theses.lib.polyu.edu.hk/handle/200/5810
Abstract: The dedicated outdoor air system (DOAS) can handle the sensible load and latent load of supply air independently. Therefore, the problem of over-cooling in conventional air conditioning system can be prevented and the COP of chiller can be improved. In a typical dedicated outdoor air system (typical DOAS) with desiccant wheel, the latent cooling potential of exhaust air is converted to sensible load by direct evaporative cooler and recovered by sensible heat exchanger. However, it would be beneficial to recover the latent cooling potential of exhaust air directly because it is more energy consuming to generate the same amount of latent cooling potential than sensible cooling potential. In this dissertation, the newly proposed system (new DOAS) is developed based on a typical DOAS. The evaporative cooler is replaced by the desiccant wheel to recover total enthalpy of the exhaust air. The desiccant is regenerated by the heat pump which recovers the condenser heat rather than by the heat generated by the boiler. To evaluate the system power consumption and energy savings potential, a typical DOAS and the new system are considered for a building in Hong Kong. Through hour by hour simulations, the energy consumptions of the two systems are calculated and analyzed. The results show that the power consumption of heat device in the new system is half that of the heat device in typical DOAS. The results also indicate that the new system could save up to 38% of primary energy consumption. which sum of energy consumption on chiller and heat device for regeneration desiccant, in comparison with the typical DOAS.

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