BUSCH screw chiller working principle and selection

Working principle of the screw chiller:

     Screw chillers for the key parts of the compressor with screw type named screw chiller, unit evaporator out of state for the gas refrigerant; adiabatic compressor after compression into state of high temperature and high pressure. After being compressed gas refrigerant, in the condenser, isobaric cooling and condensation, condensed into liquid refrigerant, through the throttle valve was expanded to a low pressure into gas-liquid mixture. The liquid refrigerant at low temperature and low pressure, which is absorbed by the heat of cold material in the evaporator, and re becomes the refrigerant of the gas.The gaseous refrigerant is re entering the compressor and starting a new cycle. This is the four process of freezing.. Also the main working principle of the screw chiller.

Application of the screw chiller:
    The power of the screw chiller is relatively large compared with the vortex chiller, and is mainly used in the central air-conditioning system or the large industrial refrigeration.

Product selection points:
1.The main control parameters of the screw chiller are refrigeration performance coefficient, amount of cooling capacity, input power and refrigerant type etc.
2.The choice of the chiller should be considered according to the cold load and its use.. For the refrigeration system with a long working condition of low load, it is advisable to choose the multi - head piston compressor unit or the screw - compressor unit to adjust and save energy.

3.When selecting the chiller, the high priority is given to the unit with the higher performance coefficient.According to the data, the general chiller runs about 100% of the total running time of the 1/4 under the whole year.Total running time of 75%, 50%, 25%, 100% of the load of the running time of the ratio is roughly 2.3%, 41.5%, 46.1%, 10.1%. Therefore, the choice of chiller should give priority to the efficiency of the curve is relatively flat model. At the same time, the adjustment range of the load of unit should be considered in the design of the design. The partial load of the multi - head screw - the cooling chiller is good, and can be chosen according to the actual situation.
4.When selecting cooled water chillers, the condition of nominal working condition should be noted. The actual cold output of the chiller is related to the following factors:

a) cooled water effluent temperature and flow;
b) the cooled water input temperature, flow rate and fouling coefficient of cooling water.

5.When selecting cooled water chillers, the normal operating range of the model unit should be noted, and the main current limit of the main motor is the current value of the shaft power under the nominal condition.
6.In the design selection should pay attention: in the nominal working condition flow, cold water outlet temperature should not exceed 15 deg.C, the outdoor dry bulb temperature of the air cooled chiller should not exceed 43 deg.C. If it is necessary to exceed the scope, the use of the compressor should be understood whether the range of the main motor power is sufficient.

Consultation: 13816563450/021-63530083

Tags:chiller,screw chiller,BUSCH,working principle