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Test_3_Sp96 - ME 326 THERMODYNAMICS I Test 3 1(33 A...

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ME 326: THERMODYNAMICS I Test 3, April 29, 1996 1) (33%)  A 2-stroke ideal air-standard spark-ignition (Otto) engine (c P  for  air=constant=1.00 kJ/kg•K)  has a compression ratio of 8:1, and operates  at 2400 rpm.  Fuel input to the engine is 5 kJ/revolution. The engine is  used to drive an air-conditioner with a COP of 5.0. How  much cooling  capacity  Ý Q will this system have (kW)? SOLUTION: The Otto cycle efficiency is 1 1.4 1 1 1 1 1 0.564 8 so 0.564 0.564 5( / ) 2.82( / ) 2400( / min) 2.82( / ) 112.9 60( / min) ; 112.9 5 565 net O k v h net h net L refrig L net refrig net w r q w q kJ rev kJ rev rev W kJ rev kW s Q COP Q W COP kW kW W η - - = - = - = = = = = = = = = =♠ = & & & & &  
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2) (33%)   The  steam  turbine  in  a Rankine  power  plant  with  superheat  operates  with  an inlet  temperature of  650 ° C at an inlet  pressure  of  1  MPa, and exhausts to an exit pressure of 4 kPa. When operating  with  a 
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