In order to adapt to the change of the air conditioning system load, the screw chiller still needs to maintain its constant temperature in the process of operation. The screw chiller mainly accomplishes this task through its energy regulation, its control system. First, it is necessary to detect the outlet water temperature of the unit, compare it with the set value, and then issue an energy adjustment command to increase or decrease the cooling capacity of the unit accordingly.
The energy of the screw chiller is adjusted by adjusting the displacement to adjust the cooling capacity. To a certain extent, it is mainly realized by the energy regulator of the compressor. The internal pressure ratio is adjustable in the compressor. The device can reduce the load of the compressor and achieve stepless adjustment of the cooling capacity.
The screw type cold water machine can be adjusted by the energy of the multi-head unit, and can also be realized by increasing or decreasing the number of compressors. The control program can set the loading sequence of each compressor. Therefore, the multi-head screw chiller is more widely used in engineering practice due to its excellent partial load performance.
The liquid of the screw chiller is too cold before throttling, which is generally advantageous for improving the economics of the chiller refrigeration cycle, but increases equipment investment and direct operating costs. In actual use, specific conditions should be considered and a technical and economic analysis should be conducted to determine whether liquid overcooling is used.
In the single-stage compression system of the screw chiller, the supercooling of the liquid before the throttling is realized in the gas-liquid heat exchanger, and the coldness is generally 5 °C; in the two-stage compression system, the liquid before the throttling is generally After two subcoolings, it is first supercooled in the intermediate cooling and then subcooled in the gas-liquid heat exchanger.
The screw chiller is mainly based on its overheat protection as the basic protection measure. The operating temperature of the equipment in its equipment is within the safe range. If it is operated for a long time, the temperature of its industrial chiller will be larger. Changes, and even problems caused by short circuits in industrial chillers.
