Refrigeration – Automatic control – Selective heating or cooling
Patent
1992-08-12
1994-05-17
Tanner, Harry B.
Refrigeration
Automatic control
Selective heating or cooling
62211, 62223, F25B 4104
Patent
active
053117484
ABSTRACT:
Refrigerant is metered through the expansion valve based on compressor discharge temperature and ambient air temperature measurements. The microprocessor-based control system selects the appropriate stepper motor valve setting to achieve optimal performance. The temperature measurements used in the control system are decoupled from fluctuations due to shifting of the refrigerant dry out point. This allows the system to be operated at much lower superheat temperatures than heretofore attained, yielding improved performance and longer component life.
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Itoh, H. "Improvement of a Heat Pump Room Air-Conditioner by Use of Pulse-Motor-Driven Expansion Valve," Paper No. 2944, pp. 164-172.
Bahel Vijay
Herroon Gregory P.
Hickey Mickey
Millet Hank
Pham Hung
Copeland Corporation
Tanner Harry B.
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