Bitzer has released its new compact screw compressor CSW85/95 motor version 4, designed for improved efficiency in water-cooled high-performance liquid chillers. The new compressor motor selection allows manufacturers to achieve the latest efficiency requirements.
“CSW motor version 4 is a combination of the well-known Bitzer CSW screw compressor, with a special selected motor version 4 and special oil charge,” the company says. “This concept has already been successfully implemented for the Chinese market for high reliability and excellent efficiency at water-cooled chiller conditions.”
Due to the requirements of the Ecodesign Directive, the number of water-cooled systems is on the rise in Europe.
“CSW enables OEM screw chiller manufacturers to design and produce water-cooled air conditioning chillers that fulfil the highest international energy efficiency standards like the European Ecodesign 2016/2281 tier 2 and the Indian BEE-ECBC – ISEER star rating,” Bitzer says.
The product range covers nine models with displacements between 410m³/h and 1,120m³/h at 50 Hz as well as 495m³/h and 1,351m³/h at 60 Hz.
Bitzer says the application envelope was designed for highly efficient water-cooled air conditioning and process chiller applications with maximum condensing temperatures up to 46°C, which is why their technical concept includes various measures to improve the compressor’s efficiency.
“The motor features increased efficiency in the target application envelope and a reduced maximum operating current,” Bitzer says. “This gives the possibility to use smaller contactors and smaller mains cable diameters, resulting in an overall system cost reduction.”
CSW was designed for low-pressure medium- and low-GWP refrigerants such as R134a, R1234yf, R513A, R450A, R1234zeE and R515B. Also, the internal gas flow has been optimised and the internal pressure drop further reduced.