Thermodynamics

1. Thermodynamics
Tutorial 1
Dr. SUN Weimeng
swe3@np.edu.sg
Office no.:6460 8342

2. Question 1
• The volume of the fluid in the storage tank
• The density of the fluid in the storage tank
• The specific gravity of the fluid in the storage tank

3. Question 2
• The volume of the helium in the balloon
• The mass of the helium in the balloon

4. Question 3
• The volume of the bottle
• The density of the fluid
• The specific gravity of the fluid

5. Question 4
1 2 12
2 1 12 12
12 2 1 12
425 , 210 , 98
210 425 98 117
U KJ U KJ W KJ
U U Q W
Q U U W
kJ
Cooling
  
  
  
    

6. Question 5
12 2 1
2 1 12 12
12 12 2 1
625 , 1350
( )
625 1350 725
Q KJ U U U KJ
U U Q W
W Q U U
KJ
Expansion
      
  
  
   

7. Question 6
12
12
2 1 12 12
12
2 1 12 12
280
) 0
280 0 280 0
) 325
280 325 45 0
Q KJ
a W
U U Q W KJ
increase
b W KJ
U U Q W KJ
decrease


      

       

8. Question 7
2 2 3
1 1 1
1
2 2 3
2 2 2
2
1 2
2
1 1 1 1
2 2 2 2
15 15 10 / , 0.2029 / , 2952 /
30 /
1.5 1.5 10 / , 1.286 / , 2580 /
100 /
0.5 / , 20 , 28 /
2952 15 10 0.2029 3256.35 /
out
p bar kN m v m kg u kJ kg
c m s
p bar kN m v m kg u kJ kg
c m s
m kg s Z Z m Q kJ s
h u p v kJ kg
h u p v
    

    

   
      
   2
2 2
1 2
1 21 1 2 2
2 2
1 2
1 21 1 2 2
2 2
1 2
1 2 1 2
3
2580 1.5 10 1.286 2772.9 /
( ) ( )
2 2
( ) ( )
2 2
( ) ( ) ( )
2 2
0.5 (3256.35 2772.9) 10 0
outinin out
out out
out
kJ kg
c c
Q W m h gZ Q W m h gZ
c c
W m h gZ m h gZ Q
c c
m h h mg Z Z m Q
   
        
       
      
    
2 2
3
3
30 100
.5 9.81 20 0.5 ( ) 28 10
2
241725 98.1 2275 28 10
211.548 /kJ s

     
    


9. Question 8
1 2 2 1 1 2
2 2
1 2
1 21 1 2 2
2 2
1 2
1 21 2
2 2
1 2
1 2
0.65 / , 150 / , 60 / , ( ) 345 / , 60 /
( ) ( )
2 2
( ) ( )
2 2
( ) ( )
2 2
0.65 34
out
outinin out
out out
out
m kg s c m s c m s h h h h kJ kg Q kJ s
c c
Q W m h gZ Q W m h gZ
c c
W m h m h Q
c c
m h h m Q
         
        
     
    
 
2 2
150 60
5 0.65 ( ) 60
2
224.25 6.1425 60
170.39 /kJ s

  
  


10. Question 9
1 1
2 2
2 2
1 2
1 21 1 2 2
2 2
1 2
1 21 2
2 2
1 2
1 2
1.8 / , 120 / , 3250 /
30 / , 1630 / , 200 /
) ( ) ( )
2 2
( ) ( )
2 2
( ) ( )
2 2
1.8 (
out
outinin out
out out
out
m kg s c m s h kJ kg
c m s h kJ kg Q kJ s
c c
a Q W m h gZ Q W m h gZ
c c
W m h m h Q
c c
m h h m Q
  
  
        
     
    
 
2 2
3 3
2
1
120 30
3250 1630) 10 1.8 ( ) 200 10
2
2916000 12150 200000
2728150 / 2728.15 /
)
0.14 1.8
0.0021
120
J s kJ s
Ac
b V
m
V m
A m
c

     
  
 


   

11. Thank you
Q & A