ME235_Final_W13 (1).pdf

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Department
Mechanical Engineering
Course
MECHENG 235
Professor
Donald Siegel
Semester
Winter

Description
ME 235 Winter 2013 Final Exam Solutions, Section 001 (Siegel) 1. A power plant for a polar expedition operates via a Rankine cycle and uses ammonia as the working fluid. In the boiler of the plant the ammonia is heated to 80 C at a pressure of 1000 kPa. The condenser is maintained at -15 C. a. After passing through the boiler, determine whether the ammonia is saturated or superheated vapor b. Find the specific work done by the turbine, w T c. Find the specific work done by the pump, w P d. What is the thermal efficiency, η, of the cycle? 2. A diesel engine has a compression ration of 20:1 with an inlet state of 95 kPa, 290 K, and volume of 0.5 L. The cycle has a maximum temperature of 1800 K. Find: a. The maximum pressure occurring during the cycle b. The net specific work done by the cycle, w net c. The thermal efficiency of the cycle, η 3. A balloon, which is initially empty, is filled with air from a line at 200 kPa, 300K. When filled, the balloon contains 0.1 kg of air at 110 kPa, 300K. Assume the pressure of the air in the balloon is proportional to the balloon volume, P = 100 kPa + CV, and that the ambient temperature, T amb = 300K. Find: a. The final volume of the balloon, V 2 b. The work done in filling the balloon, W1 2 c. The heat transfer to/from the balloon d. The total entropy generation, S1 2,gen !!"!#$ ! -!.#/)$!.0'&,!1#$!'!.#0'$!)2.)*3,3#&!45)5!'66#&3'!/7387!35!7)',)*!,#!9: ;!',! # #30)$!'&*!,7)!8#&*)&5)$!35!6'3&,'3&)*!',!?0)!"AGAG! O ! +,',)!3&)D! T&)$%CD!!!!!/ FL5H!7 O?!7 P!!!!! ! ! T&,$#.CD!!!!!!5P!H!5 [email protected])!$).$#*48)*!>C!3&5,$48,#$5!1#$!*35,$3>4,3#&!#&!'!,?1#$?.$#13,!>'535!1#$! ,)5,3&%!#$!3&5,$48,3#&'0!.4$.#5)5!#&0C!,#!5,4*)&,5!)&$#00)*!3&!8#4$5)5!1#$!/7387!,735!,)2,>##(!7'5!>))&! '*#.,)*A!!"#$%&'()$)(*)%+,-&.%"$%)$&)/"01/&.%"$%2$&'.0$3%)4$5(#%"+$&'/&$*()6.&&(+$5#$7(-&.%"0$89:$%)$89;$ %2$&'($8".&(+$7&/&(0$?%*#)[email protected]'&$!-&$3.&'%,&$&'($*()6.00.%"$%2$&'($-%*#)[email protected]'&$%3"()$.0$,"1/32,1A$ ! ! !"#$%& & -!*.)/)0!)&%.&)!1'/!'!2#34$)//.#&!$',.#!#5!6789!:.,1!'&!.&0),!#5!;!6;7!?>! /,',)!9>!:.,[email protected]#0A3)!7B!,1)!&),!/4)2.5.2!:#$(!'&*!,1)!,1)$3'0!)55.2.)&2FB! Problem 2 (30 points): +#0A,.#&8! I#34$)//.#&!4$#2)//!J./)&,$#4.2K!!5$#3!LM/BGB6NO6
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