BITZER boosts screw compressor efficiency


22 July 2021
BITZER says the CSW motor version 4 enables OEM screw chiller manufacturers to design and produce water cooled air conditioning chillers that fulfil the highest international energy efficiency standards

BITZER is beginning European production of a new compact screw compressor designed for improved efficiency in water-cooled liquid chillers.

The CSW85/95 motor version 4 is a combination of the existing  BITZER CSW screw compressor with a new motor and special oil charge. It has already entered the Chinese market and, due to increasing efficiency requirements and customer demand, especially from Europe and India, BITZER has now begun manufacturing at its Rottenburg-Ergenzingen site in Germany.  

The product range covers nine models with displacements between 410 m³/h and 1,120 m³/h at 50 Hz as well as 495 m³/h and 1,351 m³/h at 60 Hz. Their application envelope was designed for highly efficient water-cooled air conditioning and process chiller applications with maximum condensing temperatures up to 46°C. CSW was designed for low-pressure medium and low GWP refrigerants like R134a, R1234yf, R513A, R450A, R1234zeE and R515B. Also, the internal gas flow has been optimised and the internal pressure drop further reduced. 

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The combination CSW with motor version 4 and the optimised oil version allows for efficiency to meet the specifications, for example, in a water-cooled air conditioning liquid chiller set under European standard EU 2016/2281 where the CSW motor version 4 enables the chiller’s Seasonal Energy Efficiency Ratio (SEER) to be improved by up to 8 per cent compared to a standard CSW compressor, at typical motor cooled chiller operating conditions.

The mechanical capacity control with single-slider concept can be adjusted between 100 and 25 per cent. This CSW version is also suitable for operation with an external frequency inverter at a frequency range between 20 and 60 Hz. The variable speed range depends on given operating conditions and input voltage range.