Refrigeration – Processes – Circulating external gas
Patent
1989-03-01
1990-03-06
Capossela, Ronald C.
Refrigeration
Processes
Circulating external gas
62198, F25D 1706
Patent
active
049054767
ABSTRACT:
A device for low temperature refrigerative drying of compressed air and other gases includes a gas/gas heat exchanger in one passage of which a gas to be dried is pre-refrigerated by heat exchange with gas which has already been refrigeratively dried. The pre-refrigerated gas is then passed through a trap to remove liquid therefrom and then selectively supplied to a gas passage in one of a pair, or more, of evaporators wherein the gas is refrigeratively dried at low temperature by heat exchange with a refrigerant, after which the refrigeratively dried gas is circulated through the other passage of the gas/gas heat exchanger and then discharged for use. Each evaporator is provided with a refrigerant circuit selectively supplied from a refrigerant gas condenser unit with high pressure refrigerant via an expansion valve for refrigerative drying or with warm refrigerant via an unfreezing valve for melting frozen condensate in the evaporator. When the gas passage of one evaporator becomes clogged by frozen condensate, its gas and refrigerant expansion valves can be closed while its unfreezing valve is opened to promote thawing, and the gas and refrigerant expansion valves of the other evaporator can be opened so that refrigerative drying can take place in the other evaporator while the clogged evaporator thaws.
REFERENCES:
patent: 3585808 (1971-06-01), Huffman
patent: 3596474 (1971-08-01), Bloxham et al.
patent: 3739594 (1973-06-01), Freese
patent: 4193443 (1980-03-01), Nanaumi et al.
patent: 4253315 (1981-03-01), Fiedler
patent: 4597268 (1986-07-01), Andersson
Capossela Ronald C.
Osmi S.R.L.
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