Chiller power
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Our company has a twin-screw chiller operating at -25°C, with a motor power of 250 KW and a voltage of 10 KV. Currently, the load on the slide valve is 83%, and the cooling temperature sometimes rises to -21°C; yet the motor power in such cases is only 130 KW. Seeking advice from experts: 1. What is the relationship between the load on the slide valve and the motor power? 2. Is this situation normal? Why can’t the motor reach its power rating?
The moderator is here to answer questions @YORK Industrial Refrigeration :lol
What brand is the machine? If it’s convenient, please send me the machine’s nameplate
There are many reasons for this; it is necessary to understand the operating conditions of the unit, as well as its brand and specifications, in order to analyze the cause
There are various reasons for this situation. Based on the data analysis you provided: first, the slide valve is only at 83% of its capacity; the slide valve is used to regulate the volumetric flow rate of the refrigerant, which indicates that the volumetric flow rate of the refrigerant has not yet reached the rated level. Second, the cooling temperature is only -21 degrees, which suggests that the suction pressure is higher than the designed value. As a result, the actual compression ratio of the compressor is low, and thus the power consumption is also low.
Do refrigeration equipment belong to special equipment?
Condensers, separators, and other components attached to refrigerators fall under the scope of pressure vessel management
1 For this motor, the current needs to be considered. . . When selecting a model, there should be a margin in terms of motor power; it’s useless to focus only on the power value. 2 You need to check whether the temperature of the material at the end point has dropped. If it has dropped, it indicates that the load at that end point is very low.
The higher the position of the slide valve, the greater the motor current. In systems such as York units, the slide valve and slider work together to achieve energy savings. Generally, the motor power is selected to be 1.1 times the shaft power of the refrigeration unit; if the motor power is too low, it means that the cooling capacity of the unit is not being fully utilized. Check the refrigerant, condenser, pipelines, etc