??(TH)??????? TH Series Of Environment-Friendly Refrigerants - PowerPoint PPT Presentation

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??(TH)??????? TH Series Of Environment-Friendly Refrigerants

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Title: ??(TH)??????? TH Series Of Environment-Friendly Refrigerants


1
???????
  • ??????(??)
  • ?????
  • ??????????
  • 2005?5?

2
??? ??????? Properties of ideal gas
3
???????????
1?????( ideal gas)
?????????
?????????????????????????????
2?????( real gas)
??????????,????
?????????????????????
4
3-1 ????????
kg
K
Pa
m3
RMRg8.3145J/(mol.K)
????J/(kg.K)
4
5
????Vm
  • ???????
  • ?? p ? T ???????
  • ????Vm??

??????
Vm???????
6
R?Rg???
R?????? (???????)
Rg???? (???????)
M-----????
??
7
???????
1?????
2????? K
3?????(????????)
8
??????
1. ????????? 2. ????????
?????????
??, ????? p ??, V ??, T????,
?????????????, ????????
9
????????????
??, ????? p ??, V ??, T????,
?????????????, ????????
Tgt??,plt7MPa ??????
????
O2, N2, Air, CO, H2
?????????????????????
?????(H2O, CO2)??????????
??,???????,?????CO2 ,??
10
????????????????
  • ????????????,?????pe0.22MPa,??t156?,????????????
    3200m3???????pb765mmHg,??????????qm(kg/h),???????
    ???qv0(m3/h)?

11
????????????T156273429K ?????
????????qv 3200m3/h??????????????????????????????
??qn(mol/h)
12
??????Mr28.97, ?????M28.9710-3kg/mol,????????
qmMqn28.9710-3 kg/mol 288.876103mol/h
8368.76kg/h ????????? qv022.414110-3
qn22.4141?10-3 m3 288.876?103mol/h
6474.98 m3/h?
13
3-2 (?)??specific heat
????, ?, ????????
?? ???
?????????1K?1oC?????
c ?????
?????
C ?????
CmMc22.414C
14
?????cv
???????
u????,?
??
???? v ?1kg????1K??????
15
?????cp
???????
h????,?
??
???? p ?1kg????1K?????
16
cv?cp???
1? cv ? cp ,????, ?????? ?
2????????????????, ??
????????
3? h?u ?s?????cv ? cp ?
17
???????????
  • 1)??????????????????,????,?????,?????????????????U
    U(T)?
  • 2)?HUPVUmRT??,????????????????HH(T)?

18
???????????
  • 1)
  • 2)
  • 3)

????
???,
?
19
?.?????????
??
?cn????????????????????? 
20
1?????????????
?????
?????
???
???
???
Cv,mkJ/kmol.K
Cp,m kJ/kmol.K
k
1.67
1.4
1.29
21
2.?????????
22

23
2.????????(mean  specific heat capacity)
t1, t2????, ????? 
??amoda-??bnodb
24
?
?0?t??????
????0,???????????????
?t1?t2????????
?t1?t2??????????
25
(No Transcript)
26
3.??????? 
  • ?cnabt,?

??
??????????
27
??
1) t ??????2 
2) t ??t1t2 ??
28
(No Transcript)
29
??????????
  • 1kg???0.1MPa,100????0.5MPa,1000?
  • ?

?????????,???????
30
a)??????
31
b)??????? ???6
32
c)?????? ???5
33
d)??????? ??7
34
??
  • ????u646.2kJkg ?h904.5kJ/kg

????? ?u732.1kJ/kg ?h990.4kJkg
?????? ?u729.9kJkg ?h988.1kJ/kg
??????? ?u 732.0kJ/kg?h990.3kJ/kg
1)???????
2)????????????
35
3-3 ?????u?h?s
???????u
1843?????,??????
A
B
p v T ??
??
??????
36
???????u
???????? p v T ??
????u??T??
37
???????????
????????
T, v
T
???????????,?????????
? ?????????? u
38
?????????
????
????
????,????
39
????????
????h??T??
????
????
????,????
40
? ??A?????,??,?????h????,????A??????
??
??A?????
41
0
????????,??h?u ?????? 1)?0????
2)?0 K???
42
????
?? ??1)?????????,?
?????????,?????????? ?????
43
???( Entropy)
  • ??????

reversible
??? kJ/K
??? kJ/kg.K
ds ???? ?qrev??????T????
?????????????
44
????
1???????
2??????????????? ????????
3?????
??????? Q gt 0 dS gt 0 ??????? Q lt 0 dS
lt 0
4????????? ??????????
45
??????
????
??????
????
????
pv RT
46
3-4 ????u?h?s???
h?u ?s?????cv ? cp
47
????? u???
???????????
1.
2. cv ?????
3. cv ?????
4. ????,??? ??2
48
????? h???
???????????
1.
2. cp ?????
3. cp ?????
4. ????,??? ??2
49
?????s???(1)
???????????
1?????
50
????? s???(2)
2?????
????? T0
????,? ??2?
51
???????----??
  • ???????????,
  • ??s12

?1)???????, ???????
0
?T1T2
52
???????,m??,?V22V1
0
?
???????????????
??
????????
53
?? 1)
????
2)??????,???????????? ?????????
3)??????????????
54
???????????
  • ???????????????????0.8MPa,??27 ????74.33kg?????,??
    ??0.75MPa,????????????10kg???????,????????????????
    ???p00.1MPa,??t027?,??????????????h1005TJ/kg,?u
    718TJ/kg?

55
?????????,???????????
???
??????????????,???????????? ???????
???????
???????
56
?
???,?????,???????????27???,?????????????????,?????
??????,????????????????,?????????,?????????
57
??
58
?????????
????????????
???????????????,?????  ????????
?????????????,???????  ?????????????????
??
(reduced gas constant of a mixture)
(reduced molar mass  of a mixture) 
???????????Rg??M?????????
58
59
??????????????????
?????
Daltons law of partial pressure
p T V
???pi
60
?????
p T V
???pi
61
?????????
????????????
1. ????????? 2. ????????
??????
???????????????????????????
???????i ????????????
62
?????
????
????
p T V
???Vi
63
????????
1.????(mass fraction of a mixture)
2.????(volume fraction of a mixture)
3.????(mole fraction of a mixture)
63
64
4.????????
64
65
6.????????M??Rg? 
a)??????
65
66
b)??????
66
67
?????????(1)
  • ?????????????1kmol O2?N2??VAVB,
  • TATB?????,????
  • ?,????

68
????????????
???1kmol
0
0
?
69
???
???
70
????????(pA1,TA)?????,?O2?N2??????????????????,??
0
71
?????????(2)
????A,B????1kmolO2?N2,???????C,?VAVBVC,TATBTC
????

72
????
???
73
?? ?O2??N2,?S?
????S??S???
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