Patent ID: 7228706
Filing Date: 2007-06-12
Classification: F25B,F28F

Abstract:
1. A direct expansion evaporator for facilitating evaporation of a refrigerant moved in a circuit through the evaporator to a compressor through a suction tube, the compressor drawing a first fluid mixture of a refrigerant and a lubrication oil through the suction tube in a first direction, said first fluid mixture exerting a first fluid pressure in a second direction opposite to the first direction, the direct expansion evaporator comprising: a plurality of evaporator tubes, each said evaporator tube providing a conduit for the first fluid mixture; an elongate header comprising a substantially vertical pipe having an internal cavity extending upwardly from a bottom end thereof; each said evaporator tube intersecting said header at a predetermined location along the header; the internal cavity including a bottom portion located at the bottom end of the header in which a second fluid mixture accumulates, said second fluid mixture being substantially static and subject to a second fluid pressure, said second fluid mixture comprising the refrigerant and the lubrication oil, the second fluid pressure being substantially greater than the first fluid pressure; an extraction apparatus comprising: