The Exprimental Parameters Effect on The Performance of Cromer Wheel System in Airconditioning Unit

Abstract

The main aim of the present study is to design and test the dehumidify systemfor air-conditioning unit and testing rig to find out the performance of usingpolymer technique to control the inside conditions, that are represented by relativehumidity and temperature in testing room by using desiccant wheel (Cromer cycle),and testing the effect of some parameters which can improve the performance ofthis system. An air-conditioner unit of 2tons capacity was installed in this systemand used one type of desiccant material (silica gel) was used in this work. Twothicknesses of desiccant material and two widths (channels depth) were studied3.5mm with channel depth 5cm and 2.5 mm with channel depth 20 cm and wheelsdiameter of 90cm.Four rotational speeds for desiccant wheel were studied (36, 45,60, and 90) rph and the regeneration temperature was used to control the inletregeneration air temperature using a number of electrical heaters. The series of testshowed that, the best COP, efficiency and relative humidity control within theconditioned space was for the silica gel at thickness 2.5mm and channel depth20cm. The maximum adsorption and desorption rate was 0.5427g/kg and1.322g/kg respectively at 36 rph and (36.5 oC) regeneration temperature and thebest COP of A/C was about (5.12) at 36 rph and (42 oC) regeneration temperature.Experimentally the best sensible and total efficiency that can be achieved was(18.1%) and (17.98%) at 45 rph and (30.6 oC) regeneration temperature and(17.88%), (17.76%) at 36rph and (30.91oC) regeneration temperature. The bestlatent efficiency was (6.2 %) at 45 rph and (43.26 oC) regeneration temperature