| http://www.w3.org/ns/prov#value | - Heretofore, and so far as is known, insystems employing heat exchangers of the evaporator type-into which a volatile refrigerant is discharged for contact with tubes, coils or other surfaces to effect a heat-exchange therebetween and thus vaporize the refrigerant into a low-pressure fluidthe normal charge of refrigerant is such as to substantially flood the evaporator or to have a substantially la
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