But it is not easy to compete with the conventional absorption
and vapor compression refrigeration. The refrigeration output
density and the COP of the adsorption refrigeration systems are too
low to meet the requirement of the practical applications. It is not
enough just to resolve the problems and difficulties with vacuum
leakage, poor mass and heat transfer. The adsorption deterioration
of adsorbent is also non-negligible. It shortens the serve life of the
adsorption refrigeration systems. But little work about the
adsorption deterioration of adsorbent especially physical adsorbent
has been done. So much effort should be done to resolve the
problem of the adsorption deterioration.