Heat exchange – Movable heating or cooling surface – Rotary drum
Patent
1984-10-09
1986-07-08
Davis, Jr., Albert W.
Heat exchange
Movable heating or cooling surface
Rotary drum
62202, 236 68B, F25B 2900
Patent
active
045987645
ABSTRACT:
A control system for a refrigeration heat pump apparatus and an auxiliary heating apparatus has a two stage thermostat with the first stage normally controlling the heat pump apparatus and the second stage normally controlling the auxiliary heating apparatus. An outdoor temperature thermostat is used to transfer the control of the auxiliary heating apparatus to the first stage when the outdoor temperature drops below a predetermined value and the heat pump is deenergized as its efficiency drops at that low outdoor temperature. Each of the stages of the thermostat has an anticipation means such as a heater to artificially heat the temperature responsive element. In order to improve the control and reduce the large change in temperature when the auxiliary heat is switched over to the first stage, both of the anticipation heaters of the first and second stage are connected to be controlled by the first stage during the operation of auxiliary heat by the first stage.
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Blinn Clyde C.
Davis Jr. Albert W.
Honeywell Inc.
Smith Randolph A.
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