ENSC 2213 Thermodynamics Exam Problems - Prof. Afshin Ghajar, Exams of Thermodynamics

Download ENSC 2213 Thermodynamics Exam Problems - Prof. Afshin Ghajar and more Exams Thermodynamics in PDF only on Docsity! ENSC 2213 Thermodynamics EXAM 3/11-18-11 NAME Coils Surroum,lings 7 c- =- l-f ( z.'t 9 I(- T£..) / 'e. :. //q Z -1.(1c. -) / / ,/,/ I,-f "" "Z-s 0e. 1Q>f:- '7 * Q<: VI f Qc:::.:: "/// /ic.7.. (a) The power input (kW). (b) The lowest theoretical temperature inside the refiigerator (0C). (25) Problem 1. A househol refiigerato operates a~ady sta!S>in an environment (kitchen) ~t 25~The refiigerator has a coe ficient of performance of 4.0 and rejects 5.0 kW by heat transfer to its surroundings (kitchen air) from metal coils located on its exterior. For this refrigerator determine: C\) / ENSC 2213 Thermodynamics EXAM 3/11-18-11 NAME (25) Problem 2.. On~-qua~~_,<0.25)--.,1bmol of ,~~rogen g~ ideal gas with variable spefijic heats) contained In M:losed sygem undergoes a compressIOn process from PI = 20 Ib£iln , \ --- ._.-1 TI = 500 oR to P2 = 150 Ibf/in . For the process Q = -125.9 Btu and W = -500 Btu. (a) Determine the final temperature (T2) for the process eR). (b) Determine the change in entropy between states I and 2 (Btu! OR). 1/ ::2-0 f' 5 ; T, :0 '7 (JO C K... J9fv I), -::21~9,~;;':;'r Q. -; -/~5.9 ff/-y W -- - > 176 If..f.,., Y'A 0 .1) /(,~( /?-",,60 'psI ~, !<e: ;().'>.-~ \. I '. a) Q-W - _ / v>.1{$rrc ) .2-$ -I-