Bitzer has been showing off various technological innovations at the Mostra Convegno exhibition in Milan including compressor developments
- BITZER claims its Advanced Header Technology (BAHT) for scroll compressor tandems and trios makes it easier to use BITZER scroll compressors in parallel circuits for air conditioning and heat pump systems. The newly developed suction gas header with integrated oil distribution plays a key role, specifically directing oil to one of the compressors in the tandem and trio units.
The company claims the system even works when uneven compressors are combined and allows the frequency of a single compressor to be adjusted. One major benefit is that active oil management with an oil separator is no longer necessary for distributing the oil. Even when a compressor is shut off, oil distribution is maintained in the unit.
- BITZER says it has optimised its CR capacity control system by adding blocked¬ suction. The heart of the CRII system is the newly constructed control piston with a hollow -design, which facilitates an extremely high switching frequency.
Depending on the operating conditions and refrigerant, a special control algorithm allows compressors to be infinitely adjusted. With the CRII, BITZER has achieved an exceptionally wide range of control between 10 and 100% for four and six-cylinder compressors.
The increased switching frequency on the other hand ensures smaller fluctuations in controlled value, temperature and pressure and, in combination with the expanded range of control, optimises system efficiency. As a result, tandem compressors can even be reduced to 5 per cent.
- The CSVH3 series is a regulated speed compact screw compressor range. BITZER has added two significantly more powerful larger models to its existing CSVH series. The CSVH37 compact screw compressor has a cooling capacity of 550 kW (+5/50 deg C) and a displacement of up to 960 m3/h, while the larger CSVH38 possesses an impressive cooling capacity of 660 kW (+5/50 deg C) and a displacement of up to 1,156 m3/h.
Bitzer says the series is based on the proven engineering of the CSH series and has a very wide range of applications, from liquid chillers to heat pumps.
Additional advantages of the CSVH3 series are its ease of installation and the integrated frequency inverter’s soft start feature, which facilitates the steady increasing of the initial current with no voltage spikes.
- BITZER also exhibited a study for a CSVW2 compact screw compressor The CSVW2 has been optimised for water-cooled rather than air-cooled chillers. To this end BITZER has adapted the familiar mechanism of the CSVH2 compact screw compressor to these new operating conditions, thereby bringing on board for the CSVW2 the CSVH2’s strengths such as durability and wide application range, from process cooling to heat pump applications.
The CSVW2 study also features automatic operating parameter control and a performance range which can be reduced by up to 16 per cent. The CSVW2 study is the same size and weight as the compact CSVH2 range. Thus the CSVW2 will not only set new efficiency benchmarks for its class but also offer the lowest weight and most compact dimensions.