1
???????
??????(??) ????? ?????????? 2005?5?
2
???? ???? refrigeration cycle
3
12-1 ??
???? ??????????
???
???
??(??)?? ????(?????),??? ????
???? ????(?????),?????????
???
3
4
?????????
Coefficient of Performance
T0??
q1
?????
w
q2
T2??
5
?????????
Coefficient of Performance
T1??
q1
?????
w
q2
T0??
6
???????
???????????????????
????????????????? ????(kJ/s)?
???????????
1??1?0C????24?????? ?0C???????
????(??)? r 334 kJ/kg
1??3.86 kJ/s
1????3.517 kJ/s
7
??????
v
?????? ???? ?????? ????? ???? ????? ?????? ????? ????
v
v
8
8
9
12-2 ???????? --
Gas-compression refrigeration cycle
???
?.??
2
3
???
???
???
???
1
4
10
??????????
??????????
???????? ???? ? ??
11
P-v??T-s?
p
T
3
2
2
3
T0
T2
1
4
1
4
v
s
s
1 2 ????
2 3 ????
p
??????
3 4 ????
s
4 1 ????
p
12
?.????the coefficient of performance(COP)
???invariable specific heat
capacity
12
13
??????????
? ??????,??,?????
2. q2cp(T1-T4),??cp??, (T1-T4)????, q2 ???
3. ?????m?,???Q2m q2?,
? ?????,???????
14
?? 
1)?????T 0?TC 
2)
14
15
?????????????????????
?
16
?.???????????  ??????,qc??, ??p??,e??,??? Qc
?e,????????? ?????
16
17
???  ?? ??12nm1??45gk4  ?? qc??1mg61 
q1??34kn3??35gm3
e??, 
p??
17
18
???????????????p10.1MPa,t1-20
?,??????????p20.5MPa,????????????????????t320???
tc-20?,t020?,?????????????,?1.4???(1)?????????
??kg??????(2)??????????,????????????
(2)?
????
19
? (1)??????? ???,
?
??
??????
20
????????
???????????
?kg?????????????kg??????
21
??????
???????
?????????
(2) ?????????
???,?????12-4,?
?
22
?? ? ??,?????????????????,?? ??,?
? ???,??????,????????????? ?????? ?????
???????????????6.33,????????,?????????????????????
??????????,????????????
23
???????????
2. q2cp(T1-T4)?, ????q2 ???
? ?????,???????
24
12-3 ????????   --The vapor-compress
ion cycle
?.????e 
24
25
?.??????
25
26
26
27
27
28
????????????????,????105kJ/h????????27c,?????-5
c,?????????????????????????????????
29
? ?logp-h?,??
30
12-4 ???(Refrigerants)??
??????? 1.?????????????????
2.????? 3.??????????? 4.??????,?????
5.???????????,?????????? ????
6.??????(?T-s?)??,???????? ????????????????
30
31
???????  1.????? 2.????   3.????,??????,


31
32
??????
Cm Hx Fy Clz
???
F
R(m-1)(x1)y
Cl
Cl
H
?R12CF2Cl2
C
R22CHF2Cl
F
R12 1 0 2
90n
C
H
F
33
??????
?????
R134a C2H2F4Cl2
R134a
R134
34
???????
?????????????????????????????????
?????????????????????????????????????
?????(???)?(???)
?(???)??? (???)
????(??)????,??????????????????????????
?,???????????,????????????????????????????????????
,??????????????? ???????????????????,????
????????????
35
????????,??????????,??????????????????????????
? ?????????????????????,??????????????????????
?????????????????,? ??, ?????????????, ?????
???????????????,???????????????????????,????,??
?????????,?????????????????????????,??????????????
?????????,???????? ???,????????,??????????????
???????,???????????????????
36
12-6 ????heat pump
?. ??
?. ????
????
?????
??????
36
37
?. ???? ????????????30???,???
??????,???1000????
?????,????100??? ????
1.e'?TR-T0??,????e'????
2.??,???????????????
3.??????,?,????????? ???????
37