Refrigeration – Automatic control – Selective heating or cooling
Patent
1995-06-26
1997-01-28
Tanner, Harry B.
Refrigeration
Automatic control
Selective heating or cooling
62230, 622387, 623231, F25B 1300
Patent
active
055968783
ABSTRACT:
A refrigeration unit of the type having an economizer cycle driven by a prime mover cooled by a liquid coolant. Electrical control configures refrigerant flow paths of the unit to provide heating and cooling cycles, as required to control the temperature of a conditioned space to a predetermined set point temperature. Heat from the liquid coolant is used to enhance the heating cycle. A heating cycle is initiated immediately, when required, when the temperature of the liquid coolant is above a predetermined temperature. A heating cycle is delayed by a special refrigeration cycle which increases the load on the prime mover, when the temperature of the liquid coolant is not above the predetermined temperature. In a preferred embodiment of the invention, the special refrigeration cycle provides simultaneous heating and cooling cycles, which include evaporating liquid refrigerant in an evaporator associated with the conditioned space, as in a cooling cycle, while condensing hot gas refrigerant from the compressor in a condenser associated with the conditioned space, as in a heating cycle.
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Freund Peter W.
Hanson Jay L.
Hoium Stanley O.
Nixon James E.
Tanner Harry B.
Thermo King Corporation
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