Johnson Controls’ new YZ Magnetic Bearing Centrifugal Chiller, rated “the world’s most efficient chiller”, is now available locally. Released globally in September 2018, the YZ Magnetic Bearing Centrifugal Chiller is the world’s first chiller to be fully optimised to use the next-generation low global warming potential (GWP) refrigerant R-1233zd(E).

York YZThe chiller uses an integral, variable speed drive and advanced magnetic bearing technology that features a single moving assembly suspended in a magnetic field that does not require lubrication. This technology requires significantly fewer moving parts than traditional oil- or refrigerant-lubricated drivelines.

Compared to traditional fixed-speed oil-bearing chillers, the YZ delivers up to 35% annual energy savings, according to Johnson Controls’ Russell Hattingh. “That’s a huge saving when you consider that the initial cost of the chiller is only a small fraction of the life cycle operating energy cost,” he says.

“The York YZ, which provides cooling capacities of between 800kW and 3.5MW, is truly the most advanced and energy efficient solution in its class. I believe it will achieve a strong uptake among organisations that are focused on energy efficiency and greener refrigerants, driving down operating and lifetime costs, and maximising their investments.”

The energy savings and lower operating costs delivered by the YZ chiller are achieved by taking advantage of the off-design conditions where chillers operate 99%, Hattingh adds. The YZ operates with condenser water temperature as low as 4.5°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 economiser. This also simplifies the system, requires less mechanical room space and saves money on components, piping, controls and maintenance.

With a single moving assembly levitating in a magnetic field, the driveline in the York YZ doesn’t require any lubrication and has 80% less moving parts. The non-contact design of the driveline delivers dramatically reduced maintenance costs over the life of the chiller, Hattingh says. “With simplified driveline maintenance, ongoing maintenance expenses of the York YZ equate to less than 10% of the initial chiller cost, which is why the York YZ is simply unrivalled in savings over the lifetime of the chiller.”


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