Means to measure, indicate and regulate thickness of ice layer in refrigeration system

摘要

A refrigeration system includes a latent heat storage tank having an evaporator coil or tube submerged in water and on which a layer of ice forms in response to circulation therethrough of refrigerant from a motor-driven compressor. Apparatus is provided to measure, indicate and regulate the thickness of the ice layer. The apparatus comprises an ice sensing device which provides an electric signal proportional to ice layer thickness to an electrical control circuit which then operates a meter to indicate thickness and operates a motor controller to stop or start the compressor motor. The ice sensing device comprises a probe which is periodically movable back and forth in a short arc in one cycle to detect ice by a timer-actuated electric motor and a potentiometer which moves in response to probe movement to provide a signal proportional to ice thickness to the above-mentioned electrical control circuit. Motor control is effected by limit switches and relays and a resettable peak hold circuit to maintain a peak signal value in each cycle despite further movement of the probe and potentiometer.