Experimental Investigation of The Performance of Hybrid Desiccant Air Conditioning Systems(Dept.M)

Abstract

In this study, an experimental evaluation of a hybrid desiccant air conditioning in post and pre-cooling arrangements is studied and compared versus the traditional vapor compression system (VCS). The system is mainly consisted of a rotary dehumidification unit integrated with a VCS. The dehumidification unit comprises a rotating liquid desiccant wheel. Lithium chloride is used as the working desiccant material in this investigation. The effect of regeneration air velocity. temperature and rotational speed of the wheel an the performance of the system is studied. The post cooling hybrid system is found to be an energy efficient system, it saves nearly 23% of cooling coil capacity compared to VCS. The COP. of the post cooling arrangement is nearly twice that of VCS with reheat. The pre cooling arrangement ensures low dew point temperature with an increase of COP of about 70% compared to VCS with reheat. A rotational speed of 1 rph is recommended for optimum performance. The results of the numerical model of another work is used for comparison with the experimental results of this study.