Simulation results of a variation in ambient conditions and regeneration temperature are assessed with regards to the above described exergetic framework.

5.1 Ambient conditions

The dependence of exergy destruction and exergetic efficiency on ambient humidity ratio is given by Fig 6. As the dependence on ambient temperature is almost equivalent, it is not shown here. The exergy destruction rises with increasing ambient temperature as well as increasing ambient humidity ratio. The change in exergy destruction is dominating in the adsorption and pre-cooling stages in which the driving potential for heat exchange (temperature difference) and adsorption (pressure differential) is increasing, leading to higher irreversibilities in both heat and mass transfer processes. In contrast, the exergetic efficiency is a function characterized by a maximum. This maximum is due
to opposite curvature of the exergetic product and the exergetic input. This suggests that the system performs best in certain climatic conditions for a given set of regeneration temperature, mass flow rates and building return air conditions.