الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
Natural gas is one of the most promising types of fuel. It is a versatile, clean-burning and efficient source of energy; all of this makes natural gas is the best choice for cost savings, comfort and reliability. Natural gas applications developed from street and building lighting in 19th century to a wide variety of applications in the fields of industry, transportation and power generation through complex distributing networks nowadays. The United States Energy Information Administration projects a 50 percent rise in global natural gas consumption between 2010 and 2035 because of the continuous growth in natural gas uses. The aim of the present study is to simulate, study and improve the performance of Propane refrigeration cycle in Abu-Sannan Condensate Recovery plant of the General petroleum Company in the Western Desert. In the current work, three scenarios were suggested to increase the efficiency of the system; first scenario is the optimizing of the operating conditions of the current cycle. Second scenario is using vapor compression cycle with Ammonia as a refrigerant instead of Propane. Third scenario is using Vapor Absorption Refrigeration cycle with Ammonia instead of the current Vapor Compression Refrigeration cycle. All scenarios were simulated using HYSYS software program. For the first scenario, the simulation results demonstrated that the flow rate of the refrigerant and the intermediate pressure are the key operating variables of the refrigeration system. Each effect is studied and simulated to select the optimum operating conditionsto maximize the benefit of the cycle. For the second scenario, the results showed that using Ammonia as a refrigerant is more economical and more efficient than propane because of the low cost and high latent heat of vaporization of Ammonia with special concern to the poisonous nature of ammonia at certain concentrations. For the third scenario, Absorber, Pump and Generator are added to the cycle. The results showed that the capital cost of the Vapor Absorption Refrigeration cycle is the highest and the Return on Investment for the modification is about 17.8% with a Payback time of 6 years. Economical study is made for every scenario based on Capital Cost, Operating Cost and Expected Profit to choose the optimum scenario economically and technically for the refrigeration system in AbuSannan Condensate Recovery Plant.