Refrigeration – Processes – Compressing – condensing and evaporating
Patent
1981-09-28
1983-07-19
Makay, Albert J.
Refrigeration
Processes
Compressing, condensing and evaporating
62157, 62228, 62180, 236 1B, 236 46F, 165 12, F25D 1700, G05D 2332
Patent
active
043936628
ABSTRACT:
A method and apparatus for controlling principle power consuming components such as compressors and fans for a refrigeration or air conditioning system so it will operate automatically with minimal energy consumption despite changing environmental and system conditions. The apparatus comprises a series of sensors to provide input data including the temperature from selected conditioned zones, valves for controlling coolant and refrigerant flow; switching devices for on-off control of the power components; and computing elements for receiving input data and constantly recomputing operating instructions for the power components that control their operation. The method used with the apparatus comprises dividing the total running time for system components such as the compressor and zone fans into equal sampling time periods; modulating the compressor to operate at a relatively high load level for a first predetermined power-on portion of each time period and then at a relatively low load level for the remaining power regulation portion of the period; calculating the amount of compressor energy needed to be added or substracted to maintain temperature equilibrium in the control zone; controlling the compressor to increase or decrease its full power cycle in the next succeeding time period; thereafter continuously adjusting the power and regulation cycles for the compressor in each time period based on the calculations made using the most recent temperature input data. Fans in selected cooling zones are controlled in a like manner during each of a continuous series of sampling time periods of greater length and using a separate two-mode controller function, to further help maintain set point temperature in all zones of the system.
REFERENCES:
patent: 4136392 (1979-01-01), Westphal et al.
patent: 4257238 (1981-03-01), Kountz et al.
patent: 4307576 (1981-12-01), Takano et al.
Makay Albert J.
Tanner Harry
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