A German energy specialist has launched what it claims is the world’s first production-scale chiller using water as refrigerant at the Chillventa exhibition in Germany.
The launch has provided the major talking point from the show’s first day.
Efficient Energy said its eChiller, available initially as a 45 kW unit features bespoke components to provide a highly efficient package - which the firm appears to claim could save up to 50 per cent over conventional chillers in its class.
While technical details in English are currently in short supply, the firm says that the key to using water as refrigerant is a patent micro-turbined centrifugal compressor which rotate at up to 90,000 rpm to increase pressure and therefore temperature in the fraction of water leaving the evaporator.
The resulting steam is condensed directly into the remaining cool water flow
Use of infinitely variable oil-free turbo compressors enables the eChiller’s cooling capacity to be adjusted continuously from 10 per cent to 100 per cent, while an intelligently controlled refrigerant circuit enables efficient modulation in response to changes in the ambient temperature.
Among other benefits are a free-cooling function that doesnt require an additional free-cooling circuit and the fact that using water makes it immediately F-gas compliant, the firm says.
Products offering 20 kW and 90 kW capacitz are set to follow shortly.
.The firm said that the temperature difference between evaporation and the cold water temperature and between condensing and the heat exchange temperature are minimal, making heat transfer losses negligible.
The firm also claims very low pressure drop from the refrigerant to the compressor.