Thermodynamic Analysis of Waste Heat Power Generation

Question: Discuss about the Thermodynamic Analysis of Waste Heat Power Generation. Answer: Solution 1 The chemical reaction for the vapor generation is as follows- Energy generated by steam- For 100% yield Total water amount will be converted into steam and thus- Now calculating the mass of water produced- Ratio of molecular weight of ethylene to water = Ratio of molecular weight of ethylene to water = Therefore mass of ethylene required = 41918*1.55 Therefore mass of ethylene required = 65205.77 kg When yield is 75% i.e. only 75% of the water is converted into steam- Ratio of molecular weight of ethylene to water = Ratio of molecular weight of ethylene to water = Therefore mass of ethylene required = 55890.66*1.55 Therefore mass of ethylene required = 86630.53 kg Solution 3 The given data are as follows- At 50 m above turbine pressure Pa = 307 kPa At 10 m below turbine pressure Pb = 110 kPa Turbine output = 0.5 MW i.e. the height of turbine from ground is 18.70 m Solution 4 The given data are as follows- Volume flow rate of milk V = 5000 liters/day Volume flow rate of milk V = 5 m3/day Initial temperature Final temperature Overall heat transfer coefficient U = 40 Mass of milk = Mass of milk = Mass of milk = Amount of heat required = Amount of heat required = Amount of heat required = The temperature of water leaving the heat exchanger can be calculated as- The required area of the heat exchanger can be calculated as- Total heat Q = UA References Guo, J., Xu, M. and Cheng, L. (2010). Thermodynamic analysis of waste heat power generation system. Energy, 35(7), pp.2824-2835. hman, H. and Lundqvist, P. (2014). Thermodynamic pre-determination of power generation potential in geothermal low-temperature applications. Geotherm Energy, 2(1). Zhang, X. and Jin, H. (2013). Thermodynamic analysis of chemical-looping hydrogen generation. Applied Energy, 112, pp.800-807.