Refrigeration – Processes – Evaporation induced by sorption
Reexamination Certificate
2000-03-17
2001-06-26
Buiz, Michael Powell (Department: 3744)
Refrigeration
Processes
Evaporation induced by sorption
C062S476000, C062S141000, C062S238300
Reexamination Certificate
active
06250089
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates to a multiple stage absorption refrigeration system and, in particular, to a multiple stage absorption system having the capability of heating water for domestic and other uses.
In many absorption chillers, the heat transfer surfaces are encased in relatively large vessels or shells. Where the absorption system operates near or below atmospheric pressure, the shells are not required to meet safety codes. Multiple stage chillers, however, are now operating at high temperatures and pressures in the upper stages and, as a consequence, the high pressure vessels must meet the safety code requirements, thus increasing the cost of the system.
One option offered to the purchaser of a direct fired absorption system is a domestic hot water condenser wherein hot water is produced using high temperature refrigerant that is generated in the high stage boiler. Because of the pressures involved, the hot water condenser and its associated valves and piping must also meet the ASME code. This, in turn, further raises the cost of the system and, under certain conditions may adversely effect the solution concentration within the system.
SUMMARY OF THE INVENTION
It is a primary object of the present invention to improve absorption refrigeration system having the capability to heat water for domestic and other uses.
A further object of the present invention is to eliminate the need of meeting safety code requirements for a hot water condenser that is installed in a multi-stage absorption system wherein one or more upper stages operate at a relatively high pressure.
Yet another object of the present invention is to place a hot water heating condenser in direct contact with a low stage generator of a multiple stage absorption system which contains an upper stage that operates well at above atmospheric pressure and is required to meet the safety code standards.
Still another object of the present invention is to provide a hot water heating capability in an absorption cooling system without considerably raising the cost of the system.
These and other objects of the invention are attained in a multiple stage absorption refrigeration system wherein the upper stage or stages of the system operate at above atmospheric pressures. A hot water heating condenser is coupled to a lower stage generator that operates at or near atmospheric pressure so that the heat of vaporization produced in the generator is used to heat domestic hot water. Control valves are provided in the lines connecting the stages so refrigerant vapor formed in a higher pressure stage can be used to produce the heat required in the lower stage condenser. The condensate is returned to the upper stage generator. The flow of solution through the upper stage generator is also terminated at this time and the loss of solution and condensate from the lower stage generator and condenser to the rest of the system is prevented by valves positioned in the appropriate solution and condensate return lines. Refrigerant vapor formed in the lower stage generator is circulated through the hot water condenser when it is employed to heat domestic water to a desired level and the condensate from this process is returned to the lower stage generator.
REFERENCES:
patent: 5636526 (1997-06-01), Plzak et al.
patent: 5727397 (1998-03-01), He
patent: 5931007 (1999-08-01), Sgamboti et al.
patent: 5941094 (1999-08-01), Tang et al.
patent: 352009149 (1977-01-01), None
Reimann Robert C.
Serpente Christopher P.
Buiz Michael Powell
Carrier Corporation
Jiang Chen-Wen
Wall Marjama & Bilinski
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