第一章__制冷与低温的热力学基础_4_(1.2)_2011_09_20~23.pdf
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1 Thermodynamic fundamentals of
refrigerationand cryogenic engineering
1.1 Methods of refrigeration
11.22 ThermodynamicThermodynamic analysisanalysis ofof refrigerationrefrigeration
cycles (First Law of thermodynamics)
第一章 制冷与低温的热力学基础
第第一节节 制冷的方法制冷的方法
第第二节节 制冷循环热力学特制冷循环热力学特性分析析 (热热一律律)
Cooling and refrigeration cycle
制冷与制冷循环制冷与制冷循环
Normal Boiling Critical Point Inversion Point
Point
T T T T T (K) t (℃)
bb bb cc cc maxmax maxmax
(K) (℃) (K) (℃)
N 74.4 -198.8 126.3 -146.9 604 331
2
0.01atm H 20.4 -252.8 33.3 -239.9 204 -69
2
00.83K83K
H 4.3 -268.9 5.3 -267.9 46 -227
e
9/22/2011 2
Refrigeration cycle
制冷循环制冷循环
High temperature heat source
高温热源
TT
HH
Refrigerator
T
L
LLow ttemperatture hheatt source
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