Heat exchange – Movable heating or cooling surface – Rotary drum
Patent
1980-05-02
1981-10-27
Tapolcai, Jr., William E.
Heat exchange
Movable heating or cooling surface
Rotary drum
236 1C, 236 91D, F25B 2900
Patent
active
042967953
ABSTRACT:
A pneumatically operated system having a control unit provided with a single inlet interconnected to a one pressure level pneumatic source and having an outlet arrangement interconnected to a pneumatically operated heating and cooling heat exchanger to control the same in either its heating mode or its cooling mode in relation to the pressure value of the pneumatic signal being directed thereto from the control unit through the outlet arrangement thereof, the control unit having a temperature sensing arrangement for controlling the value of the signal in relation to the sensed output temperature of the heat exchanger by operating a bleed arrangement of the control unit. The outlet arrangement comprises a single outlet and the bleed arrangement comprises a single bleed device having an arrangement of parts thereof that is the same regardless of whether the heat exchanger is operating in its heating mode or in its cooling mode whereby the heat exchanger is adapted to be operated in either its heating mode or its cooling mode by the single bleed device without changing the arrangement of the parts of the bleed device and by a one pressure level pneumatic source.
REFERENCES:
patent: 2727691 (1955-12-01), Alyea et al.
patent: 3047233 (1962-07-01), Scharpf
patent: 3140047 (1964-07-01), Holloway
patent: 3237860 (1966-03-01), Jentoft
patent: 3575190 (1971-04-01), Puster et al.
patent: 3605781 (1971-09-01), Joesting
patent: 3819113 (1974-06-01), Puster et al.
Robertshaw Controls Company
Tapolcai, Jr. William E.
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