الفهرس 
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Abstract
Thesis title “Studying the effect of solar energy on cooling using absorption refrigeration cycles”
In this research, a numerical model was established using ANSYS to design a parabolic trough collector PTC collector to supply energy to absorption chiller LG 240 TR for a plant in Cairo, Egypt. The parabolic trough collector is used to heat the water needed to the absorption chiller generator. The model is built up to study the PTC performance all over the year from sunrise to sunset, location Cairo, Egypt. The system consists of parabolic trough collectors (PTC), absorption chiller, cooling tower, circulating pumps, auxiliary natural gas source, etc.
The PTC and the NG source provide thermal energy for absorption chiller during day and night.
The model was validated using experimental data by Yuehong Bi et al [24]. The system’s performance was measured and compared to provide theoretical guidance for the system’s practical application.
Compatibility has been found between the analytical model, which had been built up using computational fluid dynamics analysis system (CFD ANSYS 16) software program and experimental data by Yuehong Bi et al [24] and found that the percentage error ranged from 0.25 % to 4.3 %.
Moreover, this analytical model indicated that; the geometry of PTC, orientation of PTC, absorber and glass envelope diameters that needed to heat the water to the required temperature are achieved.
Also, in case of insufficiency of PTC to heat the water, the results show the amount of LPG needed to heat the water.
For an absorption chiller capacity of 240 TR, the length of the PTC is 100 meter and the width is 23 meter, and this PTC can operate every day from 9 A.M to 3 P.M. Before 9 A.M and after 3 P.M, natural gas will be used as an auxiliary source of heat.
Based on these results, when using solar energy in absorption chiller system as a source of heat for the generator in the absorption chiller, the natural gas needed all over the year is about 42,340 kg.
But in case of non-using of solar energy in absorption chiller system, the natural gas needed all over the year is about 178,485 kg.
Therefore, the saving of natural gas all over the year is about 136,145 kg.