Smaller footprint, energy savings, and enhanced control (including a handheld pendant) are some of the new features of the first “green” chiller from ACS Group, New Berlin, Wis. New GP Series portable chillers introduce several new technologies that will later appear on central chillers. ACS markets the chillers under the AEC, Sterling, and Colortronic brands. Although ACS Group is not exhibiting at NPE, the new chillers will be operating in other companies’ booths. From 5 to 15 tons (20 to 50 kw) cooling capacity, the GP Series is the first from ACS to utilize R-410a non-CFC refrigerant in place of familiar R-22 (“Freon”). According to EPA rules, no new chillers can be sold with R-22 after 2009. R-410a is a little more efficient than R-22 and is the most efficient non-CFC refrigerant available, according to ACS R&D director Patrick Klingberg. Because R-410a operates at higher pressures, it cannot be used on standard chillers without major retrofitting. Higher refrigerant efficiency and other new features are expected to make these chillers more energy efficient. One key feature is the electronic hot-gas bypass valve, which permits an infinite range of load steps from 2 to 15 tons, thus providing much finer capacity control than standard on/off bypass valves. The externally equalized thermal expansion valve also helps provide more precise control at partial and low loads. New scroll compressor design allows for leaving water temperatures from 20 to 80 F, vs. 35 to 65 F on previous models. Klingberg says all these features provide control of leaving water temperature within 0.1° F—unusual for a standard chiller. Also unusual is the lack of a conventional control panel. Instead, a small handheld pendant has a magnetic clip that allows it to “stick” anywhere on the unit. It also can be detached from the cable and plugged into another chiller. More compact components, such as new microchannel condensers, provide a 36% smaller footprint than previous models. A thermal dispersion flow switch to protect from freezing is said to be more reliable than mechanical switches. Also new is an internal process-water bypass valve, which recirculates the water and keeps it cold during a process stoppage, thus allowing instant restart of chilling. (847) 273-7700 • www.aecinternet.com (262) 641-8610 • www.sterlco.com (810) 720-7300 • www.colortricna.com
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Editor PickChiller Sets New Benchmarks For Energy Efficiency, Tight Control
Coming in July, a new chiller line boasts up to 50% energy savings and ±0.5°F temperature control.