The York model YK centrifugal chillers from Johnson Controls used falling-film technology to accomplish refrigerant reduction, improving efficiency.
Johnson Controls has announced a refrigerant-charge reduction of up to 40% in its York model YK centrifugal chillers. Falling-film technology is used to accomplish the refrigerant reduction. This technology improves the efficiency of chiller evaporators by spraying refrigerant over the tubes instead of covering the tubes in a refrigerant bath. Because of the efficiency improvement, less refrigerant is needed. When equipped with an OptiSpeed variable-speed drive, the chillers can reduce energy usage to as low as 0.20 kW/TR at off-design conditions.
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Annual Salary Survey
After almost a decade of uncertainty, the confidence of plant floor managers is soaring. Even with a number of challenges and while implementing new technologies, there is a renewed sense of optimism among plant managers about their business and their future.
The respondents to the 2014 Plant Engineering Salary Survey come from throughout the U.S. and serve a variety of industries, but they are uniform in their optimism about manufacturing. This year’s survey found 79% consider manufacturing a secure career. That’s up from 75% in 2013 and significantly higher than the 63% figure when Plant Engineering first started asking that question a decade ago.