The present work investigates the thermodynamic optimality of a double-effect vapor absorption refrigeration system (VARS) driven by blowdown heat of a 210 MW thermal power plant at Badarpur using response surface methodology (RSM). RSM helps to develop a relation amongst the decision variables and the second law efficiency vi a se cond-order nonlinear polynomial regression equation. In addition, the analysis of variance technique (ANOVA) is applied to identify the decision variables having a significant effect on th e system's thermal performance. Moreover, coefficient of structural bond (CSB) analysis of the evaporator is carried out. The decision variables are the temperatures of the high-pressure generator, low-pressure generator, condenser, absorber, and evaporator. Results conclude that the second law efficiency is affected significantly by absorber temp erature (F value = 2049.4), followed by condenser temperature (F value = 1596.4), and is least affected by highpressure generator temperature (F value = 495). CSB value of the Evaporator is 0.5851.
The Vapor Compression Refrigeration System (VCRS) uses a circulating refrigerant as the medium which absorbs and removes heat from the space to be cooled and subsequently rejects that heat elsewhere. Capillary tubes are commonly used as expansion device, serving almost all small refrigeration systems to reduce the pressure and temperature of the refrigerant and to regulate the flow of refrigerant to the evaporator. Objective of this research is to develop an analytical method for computing the length of capillary tube required for a specified reduction in temperature and to determine various thermodynamic and transport properties for refrigerant fluids and mixtures viz. R22, R427A, R407C, R32, R410A, available in REFPROP database and perform a comparative analysis. For achieving this objective, a mathematical model is developed using the integration of MATLAB and REFPROP software programs.
In the present work, the potential usage of blow down water from National Thermal Power Corporation Limited, Badarpur is investigated in the running of double effect H2O-Li-Br vapor absorption refrigeration system. So mass of blow down water available is computed. The blow down water is at 342.45°C which can be used for process heating.So that after process heating water enters high pressure generator at 155°C and transfer heat in such a way that at exit of high pressure generator water temperature is 140°C. The heat recovered is used as a source of energy in high pressure generator of vapor absorption refrigeration system. Results of parametric analysis show that coefficient of performance increases with increase in evaporator temperature and low pressure generator temperature; whereas, coefficient of performance decreases with increase in absorber temperature, condenser temperature and high pressure generator temperature. Parametric analysis also shows that low pressure generator temperature is most significant factor on which coefficient of performance depends. Exergy analysis of individual components of vapor absorption refrigeration system shows exergy destruction is maximum in absorber (26.17 kW) and least in high pressure generator (2.377 kW).The given model is validated with the research work carried out by Kaushik and Arora.
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