Centrifugal Chiller: Johnson Controls
The YORK brand of Johnson Controls has launched the YORK YK-EP “Efficiency Plus” water-cooled centrifugal chiller. The chiller achieves 5% capacity and efficiency improvements over the previous model. It utilizes a patent-pending mechanical compression economizer cycle to boost performance over conventional chiller platforms.
The YK-EP uses a YORK OptiSpeed™ variable speed drive, which can accept medium or high voltage power, trimming average annual energy consumption up to 30%. The chiller is able to operate with 50ºF (10ºC) low entering condenser water temperature (ECWT) compared to 75ºF (23.9ºC) of other chillers, trimming instantaneous energy consumption as much as 50 percent, according to the manufacturer. Additionally, in facilities with multiple YK-EP chillers, energy savings can be accomplished with series-counter flow arrangement. The company claims this reduces the compressor work needed on each chiller, cutting system energy use by as much as 8% at design conditions.
The YK-EP chiller, capacity of 2,500-3,500 tons, is ideal for large tonnage applications including district cooling or large central plants (universities and airports) and gas-turbine inlet-air cooling.