Chapter 6, Problem 6.38P

Initially, there is 2 kg of liquid water at 80°C in a teapot. It was observed that the water temperature decreased by 40°C after a while by leaving the teapot in the environment at 20°C. The outdoor environment is very large and the temperature variation is negligible. Paying attention to the signs; a) Absolute value of heat transfer from the kettle to the surrounding environment (kj)b) Entropy change of the water in the teapot during the process (paying attention to the sign) (kj/K) c) The entropy change amount of the ambient air during the process (paying attention to the sign) (kj/K)

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At the beginning of a cycle using air, the pressure, volume and temperature are 550 kN/m 2 , 0.025 m 3 and 15°C, respectively. The air is heatedat constant pressure until the temperature is 204°C. It is then expanded adiabatically until the temperature becomes 120°C. The air is cooled atconstant volume to a temperature of 15°C then restored to its original volume by isothermal compression. (a) Draw the pressure volume and temperature entropy diagram.(b) Determine for the cycle, the heat received,(c) the work done,(d) the thermal efficiency, Take Cp =1.00 kJ/kgK, Cp /Cv =1.4