ADSORPTION
REFRIGERATION
WANG Ruzhu
SJTU-IRC
制冷原理与技术
1.Solid sorption concepts
zAdsorption
adsorbent-adsorbate
z Physical adsorption
zeolite-water,silica gel-water,
activated carbon-
methanol/ammonia
z Chemical adsorption
CaCl
2
-ammonia,Metal hydride-
hydrogen
制冷原理与技术
Structure of adsorbent-zeolite
制冷原理与技术
2、Adsorption isobars,isotherms and
isotersis
( )
xfpT
∞
=,
Adsorption system
( )
xfp
T
∞
=
( )
xfT
p
∞
=
( )
pfT
x
=
Isotherms
Isobars
Isotersis
0
20 40 60 80 100 120 140
1000
100
10
1
0.05
0.1
0.6
0204060 80 100 120 140
1000
100
10
1
0.02
0.26
(a)Activated carbon fibre-methanol
Fig.2-135
p-T-x diagram
(b) Activated carbon-methanol
Fig.2-151 p-T-x diagram of LiBr-water
Single effect
P
e
P
c
x
T,
o
C
x
conc
x
dil
T
a
T
g
Fig.2-137,Adsorption Isobars
Adsorption：Ta、Pe;
Desorption,Tg、Pc
制冷原理与技术
3、Adsorption Refrigeration Cycle
1、Adsorption refrigeration working
pair
?Physical adsorption
zeolite-water,silica gel-water,activated
carbon-methanol/ammonia
?Chemical adsorption
CaCl
2
-ammonia,Metal hydride-hydrogen
3、Adsorption Refrigeration Cycle
（1）Basic Cycle
Fig.2-154 Solar ice maker based on basic cycle
lnP
Pc
Pe
Q
cond
Q
g
Q
eva
Q
ad
Q
h Q
c
5
614
2
3
Te
Tc
Ta Tg
Ta
Tg2
-1/T(1/K)
饱和制冷剂 Xconc
Xdil
Fig.2-155 P-T-x diagram of adsorption refrigeration cycle
LnP
A B
P
c
b Q
g
c b Q
g
c
Q
reg
Q
h
Q
c
Q
c
Q
h
Q
reg
P
e
a d a d
Q
ad
Q
ad
T
a2
T
g1
T
a1
T
g2
T
a2
T
g1
T
a1
T
g2
-1/T
Fig.2-155 Two beds heat recovery cycle
（2）Heat Recovery Adsorption Refrigeration Cycle
4,Applications of Adsorption Refrigeration
Fig.2-157
Adsorption chilled
water system driven
by hot water (Japan
Tokyo Gas Co,Ltd)
?Silica gel-water
?Q
f
=70-352kW
?Hot water driven,75-
70℃
?Cooling water:29-
33℃
?Chilled water:14-9℃
?COP：0.6
30
o
C热源温差驱动; 60
o
C COP -0.3; 85
o
C COP-0.4
干盘管工况 COP-0.5
制冷原理与技术
regenerator
evaporator
driver
fan coil
pump
chimney
condenser
check valve A
adsorber
exhaust gas inlet
vaccum valve
noser inlet locomotive roof
exhaust gas outlet
check valve B
check valve C
noser inlet
cabin
gas/air outlet
adsorber
condenser condenser
cooling air inlet cooling air inlet
chimney
内燃机车余热驱动吸附式空调器上海交大,2001
制冷原理与技术
Zeolite-water
4-6 kW AC cooling
Temp,difference between cabin and outside 8
o
C
One single adsorber system + water cold storage
冷凝器冷媒水泵储液器恒温水箱燃烧器引风机蒸发 /蓄冷器吸附床蓄冷水泵鼓风机冷却水
Fig.2-159 Laboratory test unit
Adsorber
Evap/Receiver/Cold storage
制冷原理与技术
Solar cold box for vaccine preservation
(英国 University of Warwick)
z 国际卫生组织向发展中国家推荐的用于疫苗冷藏的太阳能吸附制冷机制冷原理与技术
Solar Ice maker
（CNRS, French Company BLM)
z Solar
collector：
1 m
2
z adsorption
pair：
activated
carbon-
methanol
制冷原理与技术
（5）Adsorption Cold Storage
0
0.05
0.1
0.15
0.2
0.25
0.3
0 50 100 150 200 250
T (℃ )
x
(
kg/kg)
Ts=12.5℃
Ts=34℃
Ts=45℃
dx
fgstor
hxxq )(
10
=
制冷原理与技术
fgc
hxxq )(
12
=
10
12
xx
xx
=ε
dTcmdTxccmdxqm
pbbprpaaada
++= )(
)()/exp(/
021
xxTkkdtdx
eq
=
制冷原理与技术
-1/T
Ln(p)
A
BC
D
E
F
G
H
I
T0 T
x1
Pcond
x3
Pev
J
K
xf
xh
xj
0
0.2
0.4
0.6
0.8
1
30 50 70 90 110 130 150 170
T (℃)
ε
1
2
3
4
5
6
图2-160 Adibatic Cold discharge
0
200
400
600
0 50 100 150 200 250 300
T
g
(℃ )
q
c
(kJ/kg)
Fig.2-161 Cold storage of zeolite-water