Heat exchange – Movable heating or cooling surface – Rotary drum
Patent
1977-07-29
1979-03-13
Freeh, William L.
Heat exchange
Movable heating or cooling surface
Rotary drum
165 28, 165 43, F25B 2900, B60H 304
Patent
active
041437063
ABSTRACT:
A motor vehicle is equipped with a heater assembly in which hot coolant from the engine is circulated through a first heat exchanger, normally called heater. The vehicle is also equipped with a refrigerating unit, i.e., an air conditioner, which has a second heat exchanger, or cooler, located in front of or behind the heater. Two separate temperature sensors are provided. One of these senses the compartment temperature while the other is located directly adjacent to the heater and senses the temperature of the air leaving the heater. The responsivity of this latter sensor is made substantially lower than that of the compartment sensor, i.e., its signal change per unit temperature change is lower, resulting in differential weighting. A control unit is so constructed that when the compartment temperature rises, the heater, which is normally cycled on and off in a quasi-continuous fashion, is shut off. If the temperature rises further, the controller activates the refrigerator unit and the air is cooled. If, however, the temperature now drops below the set-point without having reached the shut-off point of the two-point air conditioner control, the heater unit is re-activated. The combination of continuous heater control and two-point cooler control insures stable compartment temperatures and rapid response.
REFERENCES:
patent: 3183962 (1965-05-01), Sternhagen et al.
patent: 3183964 (1965-05-01), Spivey
patent: 3590910 (1971-07-01), Lorenz
patent: 3826305 (1974-07-01), Fishman
patent: 3848664 (1974-11-01), Perry et al.
patent: 4019569 (1977-04-01), McMann
Hertfelder Wilhelm
Junginger Erich
Linder Ernst
Schnaibel Eberhard
Freeh William L.
Greigg Edwin E.
Robert & Bosch GmbH
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