Compressed Air Best Practices - March 2008 - (Page 32)

| 03/08 Compressed Air Industry FOOD PROCESSING | B E S T P R A C T I C E S — M U LT I - M O D U L E PROCESS AIR DRYERS the service and replacement of major refrigeration components, up to and including the condenser and refrigeration compressor. Having the means to keep the dryer online with a slightly reduced capacity permits the compressed air system to remain operational even during major servicing of the dryer. When compared to large process air dryers that incorporate a single or, at best, dual large refrigeration compressors or cylinder unloading semi-hermetic compressors to match cooling energy to variable loads, the multi-module solution provides better reliability as each refrigeration system operates at the optimal velocity for internal oil circulation and return. The optimized modules use less refrigerant charge (22 lb. max charge per module) than large heat exchanger dryers of equal capacity, especially flooded evaporator dryers. This is an important consideration in the cost of leak repairs. MultiPlex™ refrigerated dryers create an optimal drying solution for large flow installations. Operating costs are minimized by the dryer’s ability to match the energy consumption with the load on the dryer, and further savings are realized by the unit’s low-pressure drop. With single connection points for air, electric and cooling water, and with no requirement for a dedicated standby dryer, total installation costs are significantly lower than other approaches. While the single dryer footprint frees up valuable equipment room floor space, the MultiPlex™ design permits comparatively inexpensive expansion possibilities, courtesy of the double-ended header design with constant height that enables the dryer to grow with the customer’s compressed air requirements. To minimize the impact of downtime due to maintenance or component replacement, MultiPlex™ dryers can be oversized to allow servicing of one or two modules with no reduction in dew point. Employing this tactic further reduces operating costs due to the reduction in pressure drop. With the impact of downtime due to air treatment equipment failure being so critical and the costs to sustain a supply of usable air so high, it‘s logical to consider the benefits of the multi-module dryer design. Authors: C. John Bergh, Manager of Engineering, ZEKS Compressed Air Solutions Chris Ursillo, Marketing Manager, ZEKS Compressed Air Solutions For more information visit www.zeks.com Each module expands the capacity of the dryer by 1,625, 2,000 or 2,400 scfm 32 www.airbestpractices.com http://www.zeks.com http://www.airbestpractices.com

Table of Contents Feed for the Digital Edition of Compressed Air Best Practices - March 2008

Compressed Air Best Practices - March 2008 Contents From the Editor Utility-Air News The Compressed Air Audit of the Month: Saving Energy with Blowers in Canada Do You Provide World-Class Service? Managing Rotary Screw Air Compressors at Midwest Bakery The Difference Between Acfm and Scfm for Proper Vacuum Sizing Best Practices — Multi-Module Process Air Dryers The Vacuum Formation Process in Building Compressed Air Filter Elements Solberg Manufacturing Real World Best Practices: Measuring Pressure Dewpoint in a Compressed Air System Resources for Energy Engineers: Training Calendar & Product Picks Wall Street Watch Advertiser Index Job Market

Compressed Air Best Practices - March 2008

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