Inverter scroll compressor
Danfoss’ VZH inverter scroll compressor uses a brushless interior permanent magnet (IPM) design and its variable speed technology provides infinite and smooth capacity modulation.
Danfoss’ VZH inverter scroll compressor uses a brushless interior permanent magnet (IPM) design and is optimized for different pressure ratios to deliver energy savings of more than 30% when compared to a unit equipped with a fixed or mechanically modulating compressor. In addition, the variable speed technology provides infinite and smooth capacity modulation, delivering precise temperature control within 0.1 F of the setpoint. This is ideal for applications that require precise temperature and humidity control, including IT equipment, industrial processes, museums, and libraries. With cooling capacities ranging from 13 to 26 TR, the VZH provides the largest cooling capacity with a single variable speed hermetic scroll compressor and the widest variable speed compressor range in the market for air-conditioning applications. A 4:1 modulation ratio allows the VZH inverter scroll compressor to modulate from 25 to 100 rps for greater savings. Pre-equipped tandem capability extends the cooling capacity to 52 TR and a 12% to 100% stepless modulation for a variety of demanding applications where low part-loads are needed. The VZH is available with optimization at two pressure ratios for either chiller or rooftop applications.
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.