الفهرس 
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Abstract
In this work, A steady state simulation and studying performance of a Diffusion Absorption Refrigeration — DAR cycle for two configurations use ammonia, water, hydrogen as working fluids were conducted. The two configurations were numerically simulated using models developed with the commercial flow sheet Aspen HYSYS V10 software. The first configuration where the main simple DAR cycle components were simulated and validated the experimental results. The first configuration called Simple DAR cycle Which included all of the main components of the cycle and its simulation outputs, are similar to previous studies which have the same input assumptions and operating conditions. The second configuration where the modified DAR cycle was simulated which has an auxiliary heat exchanger added to the main simple DAR cycle as a modification. It was found that for the same input assumptions and heat applied, the modified DAR cycle shows higher cooling load. Therefore, higher COP than the simple DAR cycle. The optimal operation of the modified cycle is 36 W applied to the generator to achieve a COP of 0.235 instead of 0.209 for simple DAR cycle. This indicates that the model of the modified DAR cycle represents fairly well Functionality more than the Simple DAR on steady state mode. The Simulation results show that by using the modified cycle, the COP improves by 12.4%. Also, some recommendation for future work had been mentioned for some enhancement techniques in light of literature review.