A STUDY THE EFFECTS OF SOME OPERATION PARAMETERS ON CONDENSER PERFORMNACE IN SMALL A.C. UNIT WITH (R134a)

N. Merza, Basil; H. Majeed, Majid

	A STUDY THE EFFECTS OF SOME OPERATION PARAMETERS ON CONDENSER PERFORMNACE IN SMALL A.C. UNIT WITH (R134a)
AL-TAQANI
Article 1, Volume 21, Issue 4, 2008, Pages 1-17
Authors
Basil N. Merza; Majid H. Majeed
Abstract
Finned-tube heat exchangers are widely used in space conditioning systems, as well as any other applications requiring heat exchange between liquids and gases. The only significant opportunity for electrical power use reduction residential in air conditioners is in technology improvement of the finned-tube heat exchangers In this investigation, two operating parameters that a effect the air cooled condenser, air velocity and ambient temperature are studied. The velocity of air flow over the condenser ranges between 0.5 m/s and 3 m/s and the ambient temperatures are (20,28,and35)°C. It is found that condensers employing tubes of smaller diameters yield the best system performance. The effect of pressure drop for refrigerant side and air side on performance unit has been studied also. It is concluded that when the air velocity riss the condensing temperature is reduced and the work of compressor is reduca in the cycle, then the refrigerating effect rises and the coefficient of performance increases also. And when the ambient temperature rises the condensing temperature rises too and the refrigerating effect is reduce as result of the coefficient of performance decrease. Also when the air velocity over condenser rises the number of heat transfer units rises too therefore the effectiveness of condenser rises

Statistics Article View: 194 PDF Download: 52