ME250 Study Guide - Thermodynamic Cycle, Joule, Thermal Efficiency

• School: University of Waterloo
• Department: Mechanical Engineering
• Course: ME250
• Professor: Dongqing Li

Document Summary

4-77. consider a well-isolated horizontal rigid cylinder that is divided into two compartments by a piston that is free to move but does not allow ether gas to leak into the other side. Initially, one side of the piston contains 1 m3 of n2 gas at 500 kpa and 120c while the other side contains 1 m3 of he gas at 500kpa and 40c. Now thermal equilibrium is established in the cylinder as a result of heat transfer through the piston. Using constant specific heats at room temperature, determine the final equilibrium temperature in the cylinder. An isolated piston-cylinder device initially contains 0. 3m^3 of the carbon dioxide at 200kpa and 27c. An electric switch is turned on, and a 110-v source supplies current to a resistance heater inside the cylinder for a period of 10min. the pressure is held constant during the process, while the volume is doubled. Determined the current that passes through the resistance heater. see bellow.