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Analysis of automatic control of ammonia walk-in cooler refrigeration device (3)
Analysis of automatic control of ammonia walk-in cooler refrigeration device (3)
Compressor energy regulation energy regulating components: temperature controller 15, high and low pressure controller 19.
Energy regulation principle: The energy regulation of the compressor is realized by the pressure controller to control the suction pressure. The energy adjustment process is as follows.
(1) There are four compressors in the system, and the work of the first compressor (4V-12.5) is controlled by the walk-in cooler temperature controller. As long as there is a walk-in cooler whose temperature is higher than the given upper limit of temperature, the temperature controller will send a cooling signal to start the air cooler, the solenoid valve for liquid supply opens, the main valve opens, and the ammonia pump runs to supply liquid. Compressors were put into operation. Only after all the air coolers stop running, after a delay of 30 seconds, the compressor stops working.
(2) The second compressor is controlled by the pressure controller. After the system has been running for half an hour, when the suction pressure is greater than 0.2MPa (gauge pressure), it is put into operation: when the suction pressure drops to 0.09MPa (gauge pressure), it stops working.
(3) The third compressor is put into operation when the suction pressure is greater than 0.22MPa (gauge pressure) after the system has been running for 1 hour, and stops working when the pressure drops to 0.1MPa (gauge pressure).
(4) The fourth compressor is put into operation when the suction pressure of the system reaches 0.30MPa (gauge pressure), and stops working when the pressure drops to 0.05MPa (gauge pressure). The walk-in cooler compressor is equipped with an energy unloading device, and the energy adjustment of a stand-alone unit is also controlled by a pressure controller, that is, according to the change of suction pressure, the oil circuit of the unloading cylinder is controlled separately to realize the energy adjustment of a stand-alone unit.
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