In a spark ignition engine with compression ratio of 10, the lowest temperature is 200C and the...

Question

In a spark ignition engine with compression ratio of 10, the lowest temperature is 200C and the lowest pressure is 200kpa. The work output is 1000kJ/kg.
What is the maximum temperature?
What is the (air-standard) thermal effiency?
What is the Carnot effiency?
What is the Mean Effective Pressure?

Robert · Accepted Answer

1
2
1
 lowest temperatu
Given that ,  
V
compression ratio = r = 10 
V
 200 =4re
 lowest pressure = 200 k
73.15K
work
Pa
1000 k   J k g
 
 
 



 
 
For compression cycle  1 2 , which is adiabatic and reversible (entropy change, s 0  ) , we have 
   
1.41
2 1
2
V
P P 200 10 5023.77 kPa for air 1.4
V

 
     
 
 
and
  
1
0.41
2 1
2
V
T T 473.15 10 1188.499 1188.

In a spark ignition engine with compression ratio of 10, the lowest temperature is 200C and the lowest pressure is 200kpa. The work output is 1000kJ/kg. What is the maximum temperature? What is the...

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