Refrigeration – Automatic control – Refrigeration producer
Patent
1984-12-24
1986-09-02
Tanner, Harry
Refrigeration
Automatic control
Refrigeration producer
62201, 364151, F25B 100
Patent
active
046088334
ABSTRACT:
A self-optimizing, capacity control system for a refrigeration system including a compressor, a condenser, and an evaporator, all connected in a closed refrigeration circuit is provided. The compressor includes a plurality of adjustable inlet guide vanes, a motor connected to regulate the inlet guide vanes position and an electrical speed motor connected to drive the compressor. The self-optimizing capacity control system includes a microprocessor responsive to continual measurements of a PRV signal, a compressor head signal, a motor current signal and a motor speed signal for determining both the compressor speed and the position of the inlet guide vanes to define a current operating point in an initial surge surface array stored in a random-access memory. The microprocessor will initiate a "learning" mode in which the compressor motor speed will continually be decreased incrementally and the PRV will be moved to a more open position until an operating point is found where the compressor is surging. The microprocessor will update the initial surge surface array stored in the random-access memory with the latest surge conditions. Then, the microprocessor will initiate an "operating" mode in which the PRV are moved to a position responsive to a temperature error signal related to the difference between the chilled water temperature and the temperature set point and the compressor speed is set a safety margin away from the surge speed.
REFERENCES:
patent: 4142838 (1979-03-01), Staroselsky
patent: 4151725 (1979-05-01), Kountz et al.
patent: 4249238 (1981-02-01), Spang, III et al.
patent: 4282719 (1981-08-01), Kountz et al.
patent: 4490791 (1984-12-01), Morrison
Borg-Warner Corporation
Tanner Harry
Tracy James E.
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