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At the recent Society of Automotive Engineers (SAE) World Congress in Detroit, Denso outlined its progress on developing an automotive air conditioning system based on CO2 as the refrigerant. However, there is much research and development to do before the system becomes technologically viable and financially feasible.
Why Co2 ? The potential global warming effect of
Co2 is extremely low-- about 1300 that of R-134a. Even if Co2 is accidentally leaked from an a/c system, the adverse effect on the environment is said to be negligible. Also, Co2 is a natural element and readily available without extensive manufacturing processes.
*A gas cooler, which corresponds to a conventional condenser, cools Co2 refrigerant discharged from the compressor. Because this refrigerant exceeds the critical point of Co2 at the high-pressure side, it's not condensed by the gas cooler. Instead, the expansion valve condenses a part of the Co2 refrigerant.
(Continued in “Refrigeration” tab…) They will imperatively have to complete their file and obtain their certification from recognized authorities before October 2009, to be able to keep on handling refrigerants. All other operators must first attain their certification to legally pursue their activities.
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