MECHENG 235 Study Guide - Midterm Guide: Ulm School Of Design, Joule, Polytropic Process

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

Document Summary

Exam ii, november 30, 2010: borgnakke and d. siegel. In a remote location you run a heat engine to provide the power to run a: [30%] refrigerator. The input to the heat engine is at 800 k and the low t is 400 k, it has an actual efficiency equal to of the corresponding carnot unit. 10 c and th = tambient + 10, with a cop that is 1/3 of the corresponding carnot unit. Air at 100 kpa, 20 c is compressed in a piston cylinder to a volume 9 times: [30%] smaller in a polytropic process where n = 1. 25. When large concrete pipes for storm drains are made they are placed in a sealed: [40%] perfectly insulated constant p flexible bag. Assume the bag contains 1000 kg concrete at. 30 c which releases 1. 2 w/kg due to chemical reaction. This chemical heat release is like a work term in and not heat transfer.