Adsorption Cooling is a thermally driven refrigeration system, which can be powered by solar energy as well as waste heat. The use of thermal driven systems helps to reduce the carbon dioxide emission from combustion of fossil fuels in power plants. Another advantage for adsorption systems compared with conventional vapor compression systems is the working fluid used. Adsorption systems mainly use a natural working fluid such as water which has zero ozone depletion potential.
Like in a vapour compression system, the adsorption refrigeration system also consists of a compressor, a condenser, an expansion valve, and an evaporator. However, the compressor in an adsorption system is replaced by a thermal compressor which is operated by heat instead of mechanical energy. The vaporised refrigerant is adsorbed in the pores of the adsorbent in the reaction chamber. Due to the loading of the adsorbent, the thermal compressor is operated intermittently. During the first phase of the operation the refrigerant is evaporated at a low pressure and low temperature in the evaporator and is adsorbed by refrigerant under isobaric conditions. In the next phase, the charged refrigerant is regenerated by heating up the adsorber (temperature swing). A two chamber adsorption cooling system, described in the figure below enables continuous operation.
Some of the advantages offered by Adsorption Chillers are:
# Ultra low electricity consumption
# Zero ozone depletion potential
# No dangerous chemicals
# Very few moving parts
# Ease of maintenance
# Wide temperature ranges allowed
The following picture shows different components of our ADsorption chiller: