Our editors have spread a selection of feature articles before you that touch on a wide variety of cooling-related operations. Written by experts in their field, you'll have a hard time turning any page without finding something to whet your appetite.
If you suffer from separation anxiety of the industrial kind, then you'll be calmed by the article from H.A. Phillips & Co., South Elgin, Ill. “Overcoming Separation Anxiety,” explains water's destructive effects on ammonia refrigeration systems. Despite its caustic and toxic nature, pure ammonia does not affect many common metals - but add a little water and the aqueous ammonia will react rapidly with metals to cause corrosion. Determining the level of water contamination and identifying an effective separation method are crucial to optimizing system performance.
If you're in the plastics industry, then you know that temperature controllers are at the heart of the manufacturing process. From Torrington, Conn., Wittman Inc.'s Water Products Manager Wes Moffitt notes that although today's devices provide tighter control and more consistent deviations, there are vast differences among available products. In “Tight Temperature Control,” Moffitt urges readers to consider the type of cooling (direct vs. indirect), the amount of flow through the process, the size of the heater and the capabilities of the microprocessor when trying to optimize mold temperature control.
In “A Water-Saving Solution for Chilling Plastics,” we look at how one processor reduced his water cooling costs by adding a chiller. Goex Corp., a manufacturer of rigid plastic sheet and roll-stock products in Janesville, Wis., was spending more than $100,000 a year on city water to cool the cylinders in its sheet-extrusion process. Turn to page 26 to learn how installing a new chiller system from Multistack in West Salem, Wis., reduced water costs and met increased production demands.
Director Makarand A. Chitale at Mist Ressonance Engineering Pvt. Ltd., in Pune, India, wrote “Cooling with Mist,” which delves into a particular type of cooling system used in the steam cycle of a power plant and other industrial operations. Mist-cooling technology is capable of maintaining water temperatures at around 88°F (±2°F) [31°C (±1°C)] throughout the year regardless of climate conditions, with minimal power consumption and low maintenance requirements. The technology provides energy and water savings with a higher level of cooling efficiency than other systems, Chitale says.
“Less Energy, Better Drying,” by Donald C. Lewis, P.E., president of Nyle Corp. in Brewer, Maine, discusses the advantages of dehumidification drying using refrigeration compared to conventional heat-and-vent systems or systems using desiccants. Dehumidification systems can reduce energy consumption significantly while also minimizing or eliminating air emissions, Lewis says. Modern systems are effective at operating temperatures from 40 to 220°F (5 to 105°C). When combined with supplemental desiccant drying, dewpoints as low as -60°F (-50°C) can be achieved.
As energy costs continue to rise, plants with process cooling requirements are constantly seeking ways to increase process efficiency and reduce energy consumption. In “Injecting New Life into Old Insulation,” contributing editor Kristi Grahl describes how dry-air injection can restore old insulation to like-new performance without requiring a costly system shutdown.
Finally, in “Water-Saving Temperature Control,” engineers from Allentown, Pa.-based Julabo explain how using recirculating water baths instead of tap water cooling can reduce water waste while providing tight temperature control. According to the company, based on the water savings alone, many plants are able to recoup their investment in recirculating baths within one year.
Anne Armel, Group Publisher, ArmelA@bnpmedia.com
May 1, 2008