Blower system and control system therefor

Refrigeration – Automatic control – Of external fluid or means

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165 31, F24F 302

Patent

active

040117359

ABSTRACT:
An automatic control system for high pressure blower applications prevents surging under variable supply flow rate requirements and achieves maximum efficiency of operation. The supply flow rate establishes the set point of a proportional plus reset controller, the latter receiving a feedback signal corresponding to the static discharge pressure of the supply blower and responding thereto for controlling the output of the supply blower. A return blower is controlled either through a characterizer relay in proportion to the control of the supply blower to maintain a fixed precalibrated relationship between supply and return flow rates or by a further proportional plus reset controller responsive to the supply flow rate, for establishing the set point thereof, and to the return flow rate, as a feedback signal thereto, for controlling the output of the return blower.

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patent: 2696715 (1954-12-01), Lehane
patent: 2710724 (1955-06-01), McMahon
patent: 2747842 (1956-05-01), Shataloff
patent: 3465962 (1969-09-01), Matulick
patent: 3584785 (1971-06-01), Matulick
patent: 3687364 (1972-08-01), McNabney
patent: 3690548 (1972-09-01), McNabney

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