Refrigeration takes a front seat this month with two articles on the topic, plus there’s coverage on chilling, pumps and cooling tower filtration. With that many features, you, our readers, should be able to home in information to expand your knowledge bank.
For example, if you think Freon doesn’t have a place in process cooling applications, think again. In “Ammonia vs. Freon,” Susan Wagoner, advertising and communications specialist at RAE Corp., Pryor, Okla., discusses how Freon is used in food and beverage processing - sister industries normally associated with ammonia refrigeration. While R-22, the last “true” Freon, will be phased out of the new equipment market next year, the replacement refrigerants approved by the U.S. Environmental Protection Agency are recognized universally as Freons and still play a valuable role in the modern refrigeration industry.
While still focused on refrigeration, explore “A Digital Evolution in Refrigeration Control” for an update on digital temperature switches that provide the same -and more - functions as do mechanical bulb-and-capillary thermostats. According to author Michael Chhutani, temperature and humidity product manager for Dwyer Instruments Inc., Michigan City, Ind., the digital devices also can act as timers, external relays and thermometers.
When it comes to industrial cooling systems, a number of plants run with one foot on the gas and one foot on the brake, according to Bill Beard, market development manager for process industries at Grundfos Pumps Corp., Olathe, Kan. Beard wrote “Driving Pump Efficiency” to tell us why it’s necessary to change the gas/brake mindset if a plant is to operate profitably. Intelligent pump systems are key to the efficiency needed to keep profits up and waste down, he says.
Waste also rears its head when a chiller system is incorrectly sized, located or maintained. And poor fluid selection is another contributing factor. “Chiller O&M Basics” from Alan D’Ettorre, engineering manager at Mokon, Buffalo, N.Y., explains how overlooking just one of these variables can mean the loss of thousands of dollars in excess energy use and equipment repair.
Case histories are a favorite of readers because they zero in on real-life stories and real-life results. “Dry Cooling Can” by Steve Petrakis, president of Frigel North America, Lake Zurich, Ill., lays out how a central chilling system for an injection-molding operation at a container plant changed the way the company viewed such systems. According to Petrakis, Central Can Co. chose a closed-loop, dry-cooling system that reduced water and energy consumption, and provided an almost maintenance-free operation to save even more money.
Another way to keep equipment from sapping the budget is to use appropriate filtration on your cooling towers, which are essentially “gigantic air scrubbers that capture all airborne debris,” says Randy Simmons, vice president of Air Solution Co., Commerce Township, Mich. In “Clean Cooling,” Simmons notes that without effective filtration, the debris can clog the fill and become trapped in the heat exchanger. And that’s where it can build up, restricting water flow and causing equipment to malfunction when it overheats. Use the proper filtration technology and you’ll have a process cooling system that stays clean and runs efficiently all season long.
Maintain Your Mental Information Bank
September 1, 2008