8 Solar Thermal-Powered Adsorption Chiller
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Table 8.2 Specifications of
different components of the
adsorption chiller
Ad/de-sorber bed
Mass of adsorbent used, M bed
80 kg
Number of modules, N m
10
Length of each module, L m
3.65 m
Tube material
Copper
Number of tubes in each module, N t
3
Outside diameter of the tube, D m,o
16.6 mm
Inside diameter of the tube, D m,i
15 mm
Fin material
Aluminium
Number of fins in each module, N f
3310
Length of the fin, L f
342 mm
Height of the fin, H f
30 mm
Width of the fin, W f
0.105 mm
Evaporator
Tube material
Copper
Number of tubes, N t,evap
115
Length of the tube, L t,evap
3.9 m
Mass per tube, M t,evap
1.4 kg
Inner diameter of the tube, D e,i
17.65 mm
Condenser
Tube material
Copper
Number of tubes, N t,cond
220
Length of the tube, L t,cond
2.65 m
Mass per tube, M t,cond
0.96 kg
Inner diameter of the tube, D e,i
17.65 mm
from the test results of commercial adsorption chiller and can be utilized to validate
the model. The variation of temperature and uptake of the beds is depicted in Fig. 8.12.
As expected, the bed temperature increases during desorption and decreases during
adsorption. The instantaneous cooling capacity at different stages of cycle time can
be seen in Fig. 8.13. It needs mentioning that in determining the average cooling
capacity and COP, the simulation result of the first cycle is ignored. It is done as the
initial results are strongly influenced by the values used for initialization, and the
model requires a few time steps to stabilize.