Analytical Performance Evaluation of Hybrid Desiccant Air Conditioning Systems.

Document Type : Research Studies

Authors

1 Mechanical Power Engineering Department., Faculty of Engineering., Tanta University., Tanta., Egypt

2 Mechanical Power Engineering Department., Faculty of Engineering., Cairo University., Cairo., Egypt

3 Mechanical Power Engineering Department., Faculty of Engineering., Tanta University., Tanta.,Egypt

4 Mechanical Power Engineering Department., Faculty of Enginering., Tanta University., Tanta., Egypt

Abstract

Atheoretical 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 performance of the rotary desiccant wheel Is  also studied as the heart of the hybrid desiccant cooling system. Lithium chloride IS applied as the working desiccant material In this investigation. A  mathematical model of coupled heal and mass transfer of the desiccant wheel  is presented and numerically solved. The model validity is check against other   work and results are in good agreement. Effect of rotary wheel speed ,  number of transfer units (NTU) and the desiccant surface area to volume on  the performance of the wheel are investigated. The effect of regeneration air  velocity and temperature, slot diameter, evaporator an d condenser  effectiveness and dehumidification effectiveness on the system performance  is also studied. The post cooling hybrid system is found 10 be an energy  efficient system, it saves up to 30% of cooling coil capacity compared to  traditional VCS. The COP of the post cooling arrangement, is nearly twice that  of VCS with reheat. The pre cooling arrangement supplies air at lower dew  point temperature (down to 6°C) with an increase of COP up 10 80%  compared to VCS with reheat. 

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MEJ- Mansoura Engineering Journal
Volume 33, Issue 4
December 2008
Pages 25-43

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