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TRG-TRC011-EN 15
period one
Absorption Refrigeration Cycle
notes
Equilibrium Chart
The performance of the absorption refrigeration cycle can be analyzed using a
special chart called an Equilibrium Chart for Aqueous Lithium Bromide
Solutions. This chart plots the vapor pressure (vertical axis) versus the
temperature (horizontal axis) and concentration (diagonal lines) of the lithium
bromide (LiBr) solution.
The chart shows that an increase in concentration ($ to %), at a constant
solution temperature, results in a decrease in vapor pressure. Conversely, a
decrease in solution temperature ($ to &), at a constant concentration, results
in a decrease in vapor pressure. Assuming that no air or other
noncondensables are inside the chiller, the vapor pressure of the solution
determines the temperature at which the refrigerant will vaporize. In other
words, the combination of solution temperature and concentration determines
the temperature at which the refrigerant will boil (vaporize).
v
a
p
o
r
p
r
e
s
s
u
r
e
v
a
p
o
r
p
r
e
s
s
u
r
e
6
5
6
5
6
0
6
0
5
5
5
5
5
0
5
0
4
0
4
0
$
$
&
&
%
%
concentration
concentration
concentration
50°F
50°F
[10°C]
[10°C]
100°F
100°F
[37.8°C]
[37.8°C]
150°F
150°F
[65.6°C]
[65.6°C]
200°F
200°F
[93.3°C]
[93.3°C]
solution temperature
solution temperature
15
15
psia
psia
[103.4
[103.4
kPa
kPa
]
]
5
5
psia
psia
[34.5
[34.5
kPa
kPa
]
]
1
1
psia
psia
[6.9
[6.9
kPa
kPa
]
]
0.1
0.1
psia
psia
[0.69
[0.69
kPa
kPa
]
]
LiBr
LiBr
solution
solution
Figure 18