Vapor Absorption Refrigeration Research Paper

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Solar Vapor Absorption Refrigeration System Triple fluid Vapor Absorption System Vipul Shriyan1 , Utkarsh Bhalbar1 , Sarvesh Masurekar1 , Pavan Katira1 B.E. Students, Department of Mechanical Engineering, Don Bosco Institute of Technology, Mumbai-400070. Abstract - Developed in the early twentieth century, a vapor absorption system relied on external heat energy sources to achieve refrigeration. But with the advent of Vapor Compression System, it eventually lost its usage. With a COP of one fifth of a Vapor Compression System, a Vapor Absorption System is now regaining its usage in areas where power sources are a concern. Because it runs on any…show more content…
The heat exchanger is of shell and tube type. Here the partial pressure of Ammonia drops according to Dalton’s law of partial pressure, and its boiling point decreases. (v) Absorber: The hydrogen-ammonia mixture is passed through the absorber where water is admitted from the solution heat exahanger. This water, on absorbing the ammonia returns to the reservoir forming a strong solution while the hydrogen returns to the evaporator. II. THE SCHEMATIC DIAGRAMIII. THERMODYNAMIC MODEL In this, a model is prepared for analyzing the Diffusion Absorption system. To describe the cycle, two diagrams are needed, one describing the processes of pure ammonia and the other describing the processes of the ammonia solution and the gas mixture. Processes like condensation, subcooling, expansion and evaporation are for pure ammonia and hence are described on the T-s diagram. It can be seen that evaporation takes place at various partial pressures and temperatures. The following processes of the ammonia–water solution and vapor are described on h–x(quality of gas)–T diagram the process at the generator and the bubble…show more content…
14. The expected COP from the below given graphs was calculated to be 0.14 15. Conservation equations specified in reference papers were satisfied, mass flow rate of ammonia was determined to be 1.05 kg / min.  Following graphical representations were followed for selecting the operating conditions of this system: Fig 1: COP v/s Operating Pressure graph Fig 2: Genarator Power v/s COP Fig 3: COP v/s Generator Temp for various Pressure ValuesReferences [1] A. Zohar, M. Jelinek, A. Levy, I. Borde, “The influence of diffusion absorption refrigeration cycle configuration on the performance.” [2] B. Chaouachi, S. Gabsi, “Design and simulation of an Absorption Diffusion Solar Refrigeration Unit.” [3] Ahmed M.Qenawy, Abdel-Wahed F. El-Dib, Metwally M. Ghoraba, “Evaluation and performance study of solar powered Einstein refrigeration cycle.” [4] D.A.Kouremenos, A.Stegou-Sagin, “Measuring the evaporation of NH3 in triple-fluid gas absorption units.” Fig 4 : Ammonia mass fraction v/s Entahlpy The entire process plotted on the curve.  The values of the COP and the mass flow rates have been assumed under ideal conditions.  The actual values may vary slightly due to energy and other

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