In the process of operation, the screw chiller is mainly a refrigerant that is out of the evaporator and is in a state of gas. After being used, it is effectively adiabatic and compressed by its compressor, and becomes a high temperature and high pressure state when it is used, and is compressed. The latter gas refrigerant is condensed by isostatic cooling in a condenser, and after condensation, it is changed into a liquid refrigerant, and then expanded to a low pressure through a throttle valve to become a gas-liquid mixture.
The screw cold water machine is a low-temperature or low-pressure liquid refrigerant, which effectively absorbs the heat of the cold matter in its evaporator. When it is used, it will be changed into a gaseous refrigerant, and the gaseous refrigerant will effectively enter the compressor through its pipeline. Start a new cycle. This is the four processes of the refrigeration cycle and the main working principle of the screw chiller.
Screw chiller selection points
1. When the screw chiller is in use, its main control parameters are the refrigeration performance coefficient, its rated cooling capacity during operation, its input power and refrigerant type during use.
2. The screw chiller should be selected according to the cooling load and the application to a certain extent. For the refrigeration system with long running time of low load operation, it is advisable to use multi-head piston compressor set or screw type. Compressor unit for easy adjustment and energy saving.
3. When selecting a chiller, priority is given to units with higher performance coefficient values. According to statistics, the average chiller operating time under 100% load is about 1/4 of the total running time. The operating time ratios of 100%, 75%, 50%, and 25% of the total operating time were approximately 2.3%, 41.5%, 46.1%, and 10.1%.
Therefore, when selecting a screw chiller, priority should be given to a model with a flat efficiency curve. At the same time, the adjustment range of the chiller load should be considered when designing and selecting. The multi-head screw chiller has excellent partial load performance and can be selected according to actual conditions.
