Control of vapor compression cycles of refrigeration systems

Details Control of vapor compression cycles of refrigeration systems Control of vapor compression cycles of refrigeration systems

1981-08-04

1983-05-10

Wayner, William E.

Refrigeration

Automatic control

Refrigeration producer

62225, F25B 4100

Patent

active

043823670

ABSTRACT:
A vapor compression cycle refrigeration system of the type having the expansion valve (11) controlled by a temperature sensing bulb (12) at the downstream end of the evaporator (5). A by-pass line (15) is provided from the expansion valve outlet to the evaporator (5) to inject wet vapor upstream from the temperature sensing bulb (12) and provide proportioned negative feedback to the expansion valve (11) to reduce hunting or oscillating of the system.
Variations of the by-pass line are also described to give positive feedback and combinations giving integral and derivative action.

REFERENCES:
patent: 2056401 (1936-10-01), Hoesel
patent: 2323408 (1943-07-01), Miller
patent: 2353240 (1944-07-01), Huggins
patent: 3196630 (1965-07-01), Barbier
patent: 3537272 (1970-11-01), Hales et al.
patent: 3842616 (1974-10-01), Orbesen
patent: 3875757 (1975-04-01), Amano

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