# Tutorial 7 - UNIVERSITI TEKNIKAL MALAYSIA MELAKA FAKULTI...

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UNIVERSITI TEKNIKAL MALAYSIA MELAKA FAKULTI KEJURUTERAAN MEKANIKAL BMCG 2133 – THERMODYNAMICS TUTORIAL 7 ENTROPY 1. The radiator of a steam heating system has a volume of 20 L and is filled with superheated water vapor at 200 kPa and 200 o C. At this moment both the inlet and the exit valves to the radiator are closed. After a while the temperature of the steam drops to 80 o C as a result of heat transfer to the room air. Determine the entropy change of the steam during this process in kJ/K. 2. An insulated piston-cylinder device contains 5 L of saturated liquid water at a constant pressure of 150 kPa. An electric resistance heater inside the cylinder is now turned on, and 2200 kJ of energy is transferred to the steam. Determine the entropy change of the water during this process in kJ/K. 3. Air is compressed in a piston-cylinder device from 90 kPa and 20 o C to 400 kPa in a reversible isothermal process. Determine: a) The entropy change of air b) The work done.

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