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THERMODYNAMICS II
LECTURE 4
DUAL COMBUSTION CYCLE AND SOME
SOLVED EXAMPLES
1
Contents
 General Discussion of dual combustion cycle
 Examples on Diesel cycle
 Home assignment
2
Dual Combustion Cycle
3
Example
4
1 =


=
287288
10000
= 0.82656 3

 1 = 288 , 1 = 205.478 情
   1 =688.1
 2 =
2
1
  1 =
1
12
 688.1 = 57.3416  2 = 751.37  2 = 768.79
Method 1
Example
5
3 = 1100 + 273 = 1373 
2
2
=
3
3
 3 =
2
2
 3 = 1 
2
1

3
2
= 0.82656 
1
12

1373
751.37
= 0.126
3

 3 = 9.492, 3 = 1483.1  4 =
4
3
  3 =
0.82565
0.126
 9.492 = 62.198
駒  $,  =
3
2
=
0.126
0.82656 
1
12
= 1.829
4 = 729.716 , 4 = 537.3753
Example
6
Heat input to the cycle
 = 3  2 = 1483.1  768.79 = 714.31


Heat input to the cycle
  = 4  1 = 537.3753  205.478 = 331.89


Net work output of cycle
  =     = 714.31  331.89 = 382. 42


Cycle Efficiency
  =
 

=
. 
. 
= .   . %
Example
7
Method 2
Example
8
Example
9
Example
10
Method 3
Cold Air Standard Cycle Efficiency
  =  

 .
.  .  
.  .   
=  

. 
. 
. 
= . %
  =  

 .
.  .
 
.  .   
=  

. 
. 
. 
= . %
Cut off ratio = 1.829 from method 1
Cut off ratio = 1.829 from method 2
Home assignment 1
11
Home assignment 2
12

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