|
Following recent announcements of new developments,Daikin Europe N.V. enjoyed a record order intake for chillers in May.The next stage in the development programme is the upgrade of the entire screw range to stepless compressors.
With its emphasis on energy efficiency and part load performance, the replacement of stepped with stepless capacity control provides many overall advantages.Coincident with this important change, updating the air cooled R-134a chillers completes the standardisation of the control platform to pCO2 for the entire screw range.The Daikin developed ‘G’type stepless single screw compressor enables capacity requirements to be closely matched by modulating the sliding valve position according to the chilled water control condition.The main advantages of continuous modulation are better part load efficiency and more stable chilled water temperatures with closer control tolerance.
Capacity control is infinitely variable between 30 percent and 100 percent capacity on single circuit units and between 15 percent and 100 percent on dual circuit units.Due to the thermal capacity of the water loop the accuracy of control is maintained for the small percentage of operating hours outside the modulating band.
