The experimental parameters effect on the performance of Cromer wheel system in air-conditioning unit

Abstract EN

The main aim of the pre sent study is to design and test the dehumidify sy stem for air-conditioning unit and testing rig to find out the performanc e of using polym er tec hnique to control the inside c onditions, that are represe nted by relative humidity and tempe rature in testing room by using desiccant wheel (Cromer cy cle), and testing the effect of some parameters which can improve the performance of this sy stem.

An air-conditione r unit of 2tons capacity was installed in this sy stem and used one ty pe of de sic cant material (silica ge l) was use d in this work.

Two thickne sses of desicc ant material and two widths (channels depth) were studie d 3.5mm with channe l depth 5cm and 2.5 mm with channel depth 20 cm and wheels diameter of 90cm.Four rotational speeds for desiccant wheel were studie d (36, 45, 60, and 90) rph and the re gene ration temperature was used to control the inlet regeneration air temperature using a number of electric al heaters.

The series of test showe d that, the best COP, efficiency and relative humidity control within the conditioned spac e was for the silica gel at thickne ss 2.5mm and channel depth 20cm.

The maximum adsorption and desorption rate was 0.5427g/kg and 1.322g/kg respe ctively at 36 rph and (36.5 o C) rege neration temperature and the best COP of A/C was about (5.12) at 36 rph and (42 o C) 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 o C) regeneration temperature and (17.88%), (17.76%) at 36rph and (30.91 o C) re generation tempe rature.

The best latent efficiency was (6.2 %) at 45 rph and (43.26 o C) re generation temperatur e.