Bitzer will showcase its CKH reciprocating compressors for transcritical CO2 applications at the AHR Expo in the United States next week.
The compact and efficient four-cylinder model on display belongs to a compressor range with displacements between 1.9 and 22.3 CFM. All of the models in the series offer speed adjustment between 30 and 70 Hz and, thanks to their modern cylinder heads, work with low pressure pulsation.
The CKH compressors are exceptionally robust and thus reduce the amount of servicing required as well as the costs of operating refrigeration systems.
The CO2 compressors are designed for standstill pressures of up to 1,450 psi low pressure and 2,320 psi high pressure.
Bitzer's president for North America, Peter Narreau, said the company is confident that CO2 is one of the refrigerants of the future, as it offers key benefits, including a global warming potential of 1 that is practically climate-neutral and, at the same time, is exceptionally efficient, versatile and quiet.
"That’s why we developed and began manufacturing CO2 compressors over 15 years ago,” he said.
Bitzer will also be showcasing Ecoline reciprocating compressors with two distinct capacity control options. The mechanical CRII capacity control supports a wide range of control between 10 and 100 per cent, thus ensuring optimal system efficiency across all operating conditions.
To develop the CRII, Bitzer optimized its reliable CR capacity control with blocked suction and introduced a hollow control piston.
The Ecolilne Varispeed features an integrated, suction gas-cooled frequency inverter for infinitely adjustable capacity control. With a range of 25 – 87 Hz, the Varispeed provides 45 per cent more capacity at full speed and nearly 40 per cent less capacity at its lowest speed.
The result is precise temperature control with the least power consumption. Another benefit of the Varispeed is that regular servicing and a cooling fan are no longer necessary, as the frequency inverter’s suction gas-cooled operating elements ensure optimal component temperatures at all times. For supermarket applications, they’re perfect for cascade systems using R134a (for medium temperature application) and CO2 (for low temperature application).
Bitzer’s three CSV screw compressors offer a unique benefit: optimized for use in air conditioning systems, heat pump applications and industrial and process cooling, the compressors are extremely efficient.
Bitzer has integrated the liquid-chilled frequency inverter into the compressor, and it’s carefully fine-tuned at the factory and configured for maximum efficiency. The result is a very high IPLV value of more than 20 BTU/W. The CSV series is therefore unrivaled among air cooled liquid chillers with dry expansion.
Another benefit: the CSV series and CSH compact screw compressors can be combined in a single system, thus increasing versatility in full-load and part-load behavior.
"The semi-hermetic CSH compressors offer infinite or step-capacity control, are optimized for high condensing temp applications, and are the most efficient and quietest screws in their class,” Narreau said.
Bitzer is also showcasing its Orbit 6 and 8 series R410A scroll compressors, which are designed for use in air conditioning systems and heat pumps. Orbit compressors boast high isentropic efficiency, low sound levels and excellent energy efficiency.
“With more than 40 sites around the world offering a wide variety of compressor options for refrigeration and air conditioning applications, we’re always able to offer our users the right solution for any operating conditions,” he said.