According to the EPA, there is approximately ???? refrigerant vapor left in an average 350 ton R-11 chiller at 0 psig pressure once all the R-11 liquid has been removed?
The correct answer is 100 lbs. The point the EPA is trying to make here is that even after all the liquid refrigerant has been removed from a very large chiller, there is still quite a lot of refrigerant left in the chiller. For example at 85°F, the density of the R-11 vapor is 0.357 pounds per cubic foot. Therefore, if the total volume of the refrigerant circuit in the chiller (including the condenser and evaporator barrels) was 280 cubic feet, then the mass of refrigerant contained would be 100 pounds (280 ft3 x 0.357 Lb/ft3 = 100 lb). While the inside volume of the average 350 ton chiller may not be quite as large as 280 cubic feet, it is the exam choice closest to an actual case.
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