![]() ![]() Operation and Service Concerns The function of the purge system is to maintain the refrigeration system free of noncondensable gases such as air, moisture, acids and oil residue. Relief valves minimize the risks associated with an overpressuriztion incident, including potential loss of the entire refrigerant charge. Molecular-sieve canisters have virtually zero emissions, and the refrigerant adsorbed by the canister can be reclaimed and returned to the chiller owner via a refrigerant-credit program. One can also contact the OEM for further recommendations. When the canister is saturated, many refrigerant reclamation centers will dispose of them at a cost of about $75 to $100. The typical carbon-absorption canister lasts for approximately three years on an average chiller, and it has a holding capacity of approximately 9 lb of refrigerant. Activated carbon can cut emissions to 0.0049 lb of CFC per pound of air, but it is important to note that the refrigerant absorbed by the canister is not returned to the machine. Secondary absorption media such as activated carbon or a molecular sieve can reduce purge unit emissions. Make sure this is the certified efficiency of the purge unit alone, without the aid of secondary absorption media. The ARI-certified, tested refrigerant-to-air-emission ratio should be below 0.6 lb of refrigerant per pound of air purged. The only assurance one has that a particular manufacturer's purge unit will perform to its published efficiency rating is to make absolutely sure the unit is Air-Conditioning and Refrigeration Institute (ARI) certified to Standard 580. The most important criteria for any high efficiency purge system is its efficiency level.
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