Compositions – Heat-exchange – low-freezing or pour point – or high boiling... – Organic components
Reexamination Certificate
1999-06-11
2001-04-24
Ogden, Necholus (Department: 1751)
Compositions
Heat-exchange, low-freezing or pour point, or high boiling...
Organic components
C252S079000, C252S067000, C252S069000, C252S075000, C062S112000, C062S114000
Reexamination Certificate
active
06221276
ABSTRACT:
The invention relates to a heat transfer liquid for ventilation and air conditioning installations used at low temperatures, in which installations heat is recovered from exhaust air and conveyed to supply air by means of the heat transfer liquid.
In the ventilation installations in temperate and frigid climate zones, heat is nowadays generally recovered from exhaust air and transferred to supply air. This allows cutting down the annual heat consumption of air-conditioning to less than a half, and the total consumption of energy in buildings by more than 25%.
Perhaps the commonest way of heat recovery is a so-called liquid circulation system, in which the heat of the exhaust air is bound to the heat transfer liquid in a heat exchanger and the liquid is pumped via a pipeline to a supply air heat exchanger in which the heat is transferred to the supply air. The cooled liquid returns to an exhaust air exchanger to be re-heated etc.
Water would be an ideal heat transfer liquid as regards all its characteristics, but it cannot be used in systems of this kind because the supply air heat exchanger has a direct contact with cold outdoor air. When a high degree of heat recovery is required, the temperature of the heat transfer liquid drops below the freezing point of water, that is, down to −10 . . . −15° C. in Finnish climate.
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patent: 96/39472 (1996-12-01), None
ABB Installaatiot oy
Nixon & Vanderhye P.C.
Ogden Necholus
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