MECHENG 235 Study Guide - Midterm Guide: Isentropic Process, Joule, Heat Capacity

• School: U of M
• Department: Mechanical Engineering
• Course: MECHENG 235
• Professor: Donald Siegel

Document Summary

A) find the final pressure: find the specific heat transfer, find the total entropy generation per kg air. Air at 300 k, 100 kpa in a rigid box is heated to 1000 k by a 1500 k source. Air at 300 k, 100 kpa is compressed in a reversible adiabatic process by a piston cylinder so t2 = 1000 k. A large heat pump upgrades 5 mw of heat (q. Me 235 exam 2, november 22, 2005: borgnakke, me, at 85oc to be delivered at 185oc. A 0. 005 m3 tank is empty and filled with steam from a supply line at 500 kpa, 200oc. Me 235 exam 2, solution november 22, 2005: borgnakke, me, [30 points] take cv as the air out to the source surface. The first process is a constant volume process so 1w2 = 0. Energy eq: m(u2 u1) = 1q2 1w2 = 1q2 => q = u2 - u1.