(Fig. 4(d)) as a shorter
charging time is applied in open-partly charging mode. Same to the
closed mode, though the PCM inside the container is partly liquid,
the surface temperatures at different heights are relatively consistent
over the discharging period. Fig. 4(d) shows the absorber
surface temperature for open-fully charging mode during charging
and discharging periods. As seen, the surface temperature variations
for this case are similar to those for closed mode. However, it
is seen that the abrupt rise in the surface temperature greatly
weakens compared with that for closed mode. The maximum
surface temperature is almost 20 C lower than that of closed mode.
The reduced surface temperature is attributed to the heat is taken
away by the airflow.