Therefore conventional, electrically powered vapor compression refrigeration systems may not be of much use for them. The conventional vapor compression
system is run by commercial, non-natural working fluids, like
chlorofluorocarbons (CFCs), hydro chlorofluorocarbons (HCFCs)
and hydro fluorocarbons (HFCs). These are directly responsible for
ozone depletion and/or global warming. Hence, the adsorption
system is one of the promising solar thermal refrigeration methods, and it is environment friendly along with additional benefits
of low cost and low maintenance requirements. Earlier gas
separation and catalysis were the only applications of adsorptive
processes but it is only recently that these have been widely studied for refrigeration and heat pumps also.