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5. The COP of combination refrigeration cycle is high, but the system is very complicated. 6 Adsorption Refrigeration System Driven by Compressor Compared with the conventional adsorption refrigeration system for which the adsorption quantity is relative to the temperature difference of the adsorption bed, the difference for this system is that the adsorption is relative to the pressure difference between two adsorption beds, which is formed by the compressor. Thus the adsorption quantity decreased with the pressure of the adsorption bed, and the temperature decreased during the desorption process, for which the cooling power was generated.
This is the earliest record of the adsorption refrigeration phenomenon. In the 1920s, G. E. Hulse proposed a refrigeration system in which silica gel-SO2 was used as the working pair for food storage in a train. It was powered by the combustion of propane and was cooled down by the convection heat transfer of air. The lowest refrigerating temperature could reach 12 ∘ C [3]. R. Plank and J. Kuprianoff also introduced the adsorption refrigeration system with a working pair of activated carbon-methanol [4].
For adsorption refrigeration most refrigerant molecules are polar molecular gases that can be absorbed under the van der Waals force, such as ammonia, methanol, and hydrocarbons that can be adsorbed by activated carbon, zeolite, and silica gel. For physical adsorption the cycle adsorption quantity is generally from 10 to 20%. 4. The advantage of chemical adsorption refrigeration is the larger adsorption/desorption quantity, which is essential for the improvement of the specific cooling capacity per kilogram adsorbent (SCP, specific cooling power).