CH E243 Chapter Notes - Chapter 4: Gas Constant, Heat Capacity Ratio, Polytropic Process

• School: University of Alberta
• Department: Chemical Engineering
• Course: CH E243
• Professor: Glaucia Carvalho Do Prado

Document Summary

Apply energy balance relation to systems that do not involve any mass flow across their boundaries (closed systems) Moving boundary work/pdv work commonly encountered in reciprocating devices. Applying general energy balance relation ein - eout = esystem. Obtain relations for internal energy and enthalpy of ideal gases in terms of specific heats and temperature changes. Perform energy balances on systems that involve ideal gases. One form of mechanical work associated w/ expansion and compression of a gas in a piston- cylinder device part of the boundary (inner face of the piston) moves back and forth. This expansion and compression work = moving boundary work/boundary work. Moving boundary work is the primary form of work in automobile engines combustion gases force piston to move, which forces the crankshaft to rotate. In this section, we analyze the moving boundary work for a quasi-equilibrium process process which the system remains nearly in equilibrium at all times.