Screw industrial cold water machine according to different cooling mode can be divided into water-cooled screw
industrial ice machine and air-cooled screw industry cold water machine two kinds.
Screw industrial cold water machine is a large industrial refrigeration equipment, refrigeration, cooling, cooling can be.
Often used in large industrial refrigeration, central air conditioning.
The working principle of the cooling water circulation, can maintain industrial machinery and equipment working in a suitable temperature, improve the work efficiency and prolong its service life.
screw industrial cold water machine the capacity range from 100 kw to 1930 kw/h/h, power from 38 kw - screw compressor
386 kw, which can be widely applied in refrigerating capacity demand particularly large all walks of life, there are a variety of models to choose from.
we choose screw industrial cold water machine, should be in what aspects?
Here we are all listed below 5 points:
1, the selection of screw industrial cold water machine shall, in accordance with the cooling load and prepare for what to contemplate.
For low load operation condition refrigeration system for a longer time, suits to choose more head screw compressor, energy saving, easy to regulate and that is what we call the double-head screw head screw screw screw industrial cold water machine or level industrial cold water machine, but as the change of load, water chiller automatically determine open the capacity of the compressor, the compressor is in the best work of the open state, thus effectively save power.
2, selection of screw screw industrial cold water machine, give priority to the higher coefficient of performance of units.
According to previous statistics, normal screw industrial chiller year-round under 100% load running time accounts for about a quarter of the following points and run time.
Run time 100%, 75%, 50%, 25% load running time ratio is roughly to 2.
3%, 41.
5%, 46.
1% and 10.
1%.
Therefore, when choosing water chillers priority should be given cold water model of the efficiency curve is flat.
at the same time, should be considered when designing selection of load adjusting range, more head screw industrial industrial ice machine partial load performance is good, we can choose according to the actual circumstance of factory screw industrial cold water machine.
3, choose screw industrial cold water machine, should pay attention to the conditions of the nominal working condition.
Cold water machine the actual refrigerating capacity is related to the following two points:
a industrial industrial ice machine, screw water outlet temperature of chilled water and return water temperature, also is in and out of the water temperature of the shell and tube evaporator;
b, screw industrial cold water machine cooling water temperature and flow of the circulating water and dirt coefficient, refers to the condenser in and out of the water temperature.
c, if choose air-cooled screw screw industrial cold water machine must pay attention to the use environment of using the environment temperature, humidity, these factors directly affect the efficiency and service life of screw industrial cold water machine.
d, screw screw industrial cold water machine used in special industries, chemical, pharmaceutical, aerospace, machinery, aviation, chemical fiber and other industries with special requirements need to be used in advance and sales staff clear place, such as chemical industry may need to deal with the electric explosion-proof, shell and tube evaporator needs, corrosion resistance, etc.
4, choose screw industrial cold water machine, should pay attention to the type of screw type industrial cold water machine the normal work of the category, mainly motor current limit value is the current value of the shaft power under the condition of surface.
5, in the design of screw industry cold water machine should pay attention to: under nominal working condition of traffic,
the chilled water outlet temperature 15 ℃ should not be insurmountable, namely evaporation temperature not higher than the range of screw unit, can appear otherwise back to liquid, liquid strike.
Improper air-cooled screw machine cold outdoor dry bulb temperature 43 ℃.
if must overcome the above categories, when understand whether to allow the use of the compressor category, the match from the power of the motor can be enough.
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