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Psychrometric Analysis of an Air-Conditioning System Operating Under Given Ambient Conditions

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Document pages: 7 pages

Abstract: When air passes over a cooling coil whose effective surface temperature is below the dew point temperature of entering air, condensation of the moisture takes place. This separation of the moisture results in fall in the specific humidity or humidity ratio. Thus, both de-humidification and cooling can be obtained with a cooling coil effective surface temperature lower than the dew point temperature of the entering air. In this paper, a psychrometric analysis of an air-conditioning system operating under given ambient conditions was undertaken. Working with the outdoor characteristics of 35C db, and 24C wb; and indoor variables of 18C db, the analysis yielded a sensible heat ratio of 0.6966, and cooling capacity of 440 W. For calculation of psychrometric properties, the end points are important irrespective of the path followed. Altering the ambient parameters will, no doubt, either increase or decrease the operation of the air-conditioning system. Therefore, it becomes expedient to put into perspectives these factors that affect the overall performance of the system.

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