الفهرس 
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Abstract
This Thesis deals with investigations of the heat end mass transfer as well as the pressure DROP for humid air heat exchangers with highly finned lamine tuba cooling systems.
Than tested heat exchanger consists of aluminum plate-type fins pressed arround copper tubes by thermall expansion process.. It has four rows deep in direction of air flow and 12.5 fin par inch. A cold water is used as the Cooling medium and is chilled by a F-12 refrigerating machine.
A theoretical analysis was presented to show the effect of the condensed humidity on fin efficiency, overaII heat transfer coefficients, and the air side pressure drop. The calculations of heat and mass transfer are based 1n this work on enthalpy potential method.
In the study of experimental work on dry and wet fin-surface. lmpaerical correlations controlling the outsides heat transfer coefficient with Reynolds number, and out-sides heat transfer coefficient as a function of air flow rate at standard condition have been obtained. The pressure DROP coefficient is given in formulas as a function of Reynolds number. Comparison was made between dry and wet fin surface conditions The values of out• s1de heat transfer coefficient of wet surface are from 18 to 20 per cent greater than the values of that of dry surface.
Also the results of pressure DROP coefficient showed that, wet surface coefficient is increased by 21 to 23 per cent than that of the coefficient of dry surface. The values of dimensionless ratio between the total heat exchange 1n the coil. end pressure DROP energy, in case of wet surface are 50 to 46 per cent greater than the value obtained with correlations in dry surface.