Reciprocating compressors for transcritical CO2 systems

Reciprocating compressors for transcritical CO2 systems

Bitzer’s Ecoline reciprocating compressors are for the next generation of CO2 systems. Featuring six-cylinders, the series has been developed for series production to achieve new levels of energy efficiency.

Along with the mechanical capacity control, which is also new for transcritical CO2 applications, system efficiency has increased considerably in full and part-load operation, says the company.

‘We would like to make efficient CO2 technology simpler and easier to understand again, and thus significantly expand the range of applications with the forward-looking refrigerant. The ability to provide refrigeration solutions that are reliable over the long term will require expanding access to CO2 technology’, explains Rainer Große-Kracht, Chief Technology Officer of Bitzer.

Incorporating permanent magnets has made it possible to significantly increase motor efficiency in full and part-load operation. This technology has been undergoing testing and in selected systems out in the field for more than five years, says the company. These motors can be operated in the network and in the familiar speed range with frequency inverters. In addition to accommodating operation with frequency inverters, the new Ecoline+ compressors can also be equipped with the new mechanical capacity control for the first time, enabling compressor operation with a refrigerating capacity between 10 and 100 per cent.

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