Heat exchange – With timer – programmer – time delay – or condition responsive... – Having heating and cooling capability
Patent
1995-07-12
1998-03-24
Ford, John K.
Heat exchange
With timer, programmer, time delay, or condition responsive...
Having heating and cooling capability
165255, 165 42, 165293, 165 61, 165 64, 62 503, 62239, 62 502, F25B 2900
Patent
active
057302162
ABSTRACT:
Air conditioning and refrigeration apparatus for controlling the temperature of a conditioned space to a predetermined temperature band adjacent to a predetermined set point temperature via cooling and heating cycles utilizing a supply of pressurized cryogen. A cryogen driven motor drives a fan and an alternator. The alternator provides control voltage for operating electrical control devices which select a heating cycle, or a cooling cycle, as required, and which control the flow of cryogen during the selected cycle. Electrical load on the alternator, and thus a load on the vapor driven motor, is minimized to maintain air delivered by the fan to the conditioned space at a level which provides a substantially uniform air flow and temperature throughout the conditioned space. A cryogen flow control valve is motor controlled and only requires electrical energy when a change in the cryogen flow rate is desired. Heating and cooling cycle selecting valves require no electrical energy during a cooling cycle, and very little electrical energy during a heating cycle, as cryogen pressure is utilized to shift the heating and cooling cycle selecting valves when a heating cycle is desired.
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Ellingson Bradley G.
Viegas Herman H.
Ford John K.
Thermo King Corporation
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