Refrigeration cycle

1
???? ???? Refrigeration cycle
11-1 ??
11-2 ????????
11-3 ????????
11-4 ?????
11-5 ??????
11-6 ????
2
11-1 ? ?
???????????
???? ???? (heat-pump cycle)
???? (reverse cycle)
3
???????
??lt1
??gt1
???????????????COP?
?? 1 000 kg 0º C?????24 h????0 ºC?????????
1??3.86kJ/s(??1??3.517kJ/s )
4
11-2 ????????
?? ????????(Gas-compression refrigeration cycle)??
5
??????(the coefficient of performance COP)
???(invariable specific heat
capacity)
6
?? 1)
?????T 0?TC
2)
?A361255
7
????????????? ??????,qC??,??p??,e??,???Qc?e,
??????????????
8
??? ??12nm1??45gk4
qc??1mg61 q1??34kn3??35gm3
e??,p??
?A461277
9
11-3 ???????? (The vapor-compression cycle)
???????T-s?
10
??????e
????????
1. T-s??logp-h?
11
(No Transcript)
12
?A466166
13
11-4 ???(Refrigerants)??
????????? 1. ????????????????? 2. ?????
3. ??????????? 4. ??????,????? 5.
???????????,?????????? ???? 6.
??????(?T-s?)??,???????? ????????????????
14
????????? 1.????? 2.????
3.????,??????,???
????????? CHCC HCHC R134a
15
11-5 ??????
?????????(absorption refrigeration)
?????
???????
?A466255
16
?????????(steam jet refrigeration)
1. ????????
????????????? ??????673456
??????6812456 ??? ?kg???q2 q7-3 h3-h7
?kg??????? q? q5-6 h6-h5
?kg??????? q1 q8-1 h1-h8
17
2. ??????
?????????????????????? ???,?????????????????
??
?A446255
18
11-6 ????(heat pump)
????
?? ????
????
?????
??????
19
??????
???????????30???,???
,
??????,???1??m2?????,???? 100???
???? 1.e'?TR-T0??,????e'????
2.??,???????????????
3.??????,?,???????????? ????
???