Manufacturer says its new YZ centrifugal chiller range, optimised for use with lower GWP refrigerant, is 35 per cent more energy efficient than comparable fixed speed models
Johnson Controls has launched a new magnetic bearing centrifugal chiller range optimised for use with the low-GWP refrigerant, R1233zd(E).
The York YZ chiller has been designed to be oile-free and lubricant-free, while also reducing energy costs through improved efficiency features. The manufacturer claims this is the first chiller to be designed holistically around R1233zd, a refrigerant which has a GWP of 1, and is commercially available in volume, thanks to its use in the foam industry.
Johnson Controls said that the combination of low maintenance - requiring 80 per cent fewer parts than a refrigerant lubricated design - and high energy efficiency added up to a total cost of ownership that was the lowest available on the markett. It claimed that this combination meant the YZ range offered 7 per cent energy savings over its previous magnetic bearing range, the YMC2 and up to 35 per cent energy savings over traditional fixed-speed oil-bearing chillers.
Along with the magnetic bearings, the York YZ uses an integral, variable speed drive and the company’s patent falling film evaporator technology which sprays an even film of refrigerant across the length of the tubes, thus avoiding the need for a refrigerant pump.
The YZ chiller can deliver significant energy savings and lower operating costs by taking advantage of the off-design conditions where chillers operate 99 per cent of the time, to provide industry-leading ’real world’ energy efficiencythe firm claims - it operates with entering condenser water temperature as low as 4.5 deg C, providing ’enhanced performance in every operating condition and the widest operating envelope in the industry’. The chiller can also operate with condenser temperatures below the evaporator temperatures, eliminating the need for a water-side economizer, which simplifies the system, requires less mechanical room space and saves money on components, piping, controls and maintenance.