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Corresponding Author

Elzahaby, A.

Subject Area

Mechanical Power Engineering

Article Type

Original Study

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.

Keywords

hybrid desiccant system: vapor compression system: rotary desiccant wheel

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