Test_2_F95 - ME 326: THERMODYNAMICS I Test 2, October 27,...

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ME 326: THERMODYNAMICS I Test 2, October 27, 1995 1) (25%) A steam  turbine  is being  designed  that must  provide  a power   output  of 100 MW when  steam  flows through  it at a rate of    75.2 kg/s.   The  exit  conditions  are  required  to  be  P 2 =8 kPa,  x 2 =90%. The  inlet  pressure   cannot   exceed  5  MPa.  What   is   the   minimum  inlet   steam   temperature  (°C) that will provide  the required  power  output?   SOLUTION:  First Law  for steady-state, steady  flow, with  the  turbine   itself  as  the   CV,  and  assuming   PE   and   KE   negligable,  Q=0  for  adiabatic turbune, gives - Ý W = Ý m ( h e - h in )       h e =173.85+0.9x2402.3=2335.9 kJ/kg  (Table D.11)   From Table D.12, at 5000 kPa, T must be >600°C to achieve this  h in .. _______________________________________________ 2) (25%) A  5 m 3   insulated  tank  is initially  perfectly  evacuated.  It is 
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Test_2_F95 - ME 326: THERMODYNAMICS I Test 2, October 27,...

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