Consulting-Specifying Engineer - August 2008 - (Page 55) Case Study Each Modulex boiler combines up to seven independent, 151,500 Btuh, pre-assembled thermal modules housed in a common enclosure. Each module has it own controller, fan, modulating gas valve, electronic ignition, modulating burner, and flow temperature sensor. If a single module requires maintenance or repair, the other modules in the unit continue operating to maintain the system load requirements. Not only is this built-in redundancy a plus, but all of the units in the line, regardless of capacity, use the same modular design, which is beneficial from Novak’s perspective. “Even though I have 18 boilers in six different sizes, my staff only needs to learn one piece of equipment and keep just one set of spare parts on hand,” Novak said. Other Modulex features keep maintenance simple. Its snap-off enclosure panels don’t require tools for removal, and each waist-high unit provides top-lift access for fireside inspection and easy cleaning. “My crew has gone through the first round of training with Dale Prentice Co. and already understands the capabilities,” Novak said. “The units are working perfectly so we haven’t had to do any maintenance, but I’m confident we’ll be able to handle whatever might arise.” Cost savings The gymnasium and student services building, each with two units, were operational for the 2006-2007 heating season. Installation in the remaining six buildings was not complete until the summer of 2007, though early returns are positive. Leege’s ongoing energy audits have demonstrated that the decentralized heating system has achieved overall efficiency of 94%, with some buildings operating at 99%. This is a far cry from the old centralized system that operated at only 70% efficiency. The improved efficiency is driven Input #229 at csemag.com/quickResponse Consulting-Specifying Engineer • AUGUST 2008 by both the system design and the highefficiency Modulex equipment. By moving to a decentralized system design, Concordia reduced the electrical expense for pumping throughout the underground piping system. The new condensing boilers feature very high turndown, from 13:1 to 23:1 depending upon unit, to minimize cycling and prevent wasteful temperature overshoot. Information provided by Aerco International Inc. 55 http://www.sens-usa.com http://www.sens-usa.com http://csemag.com/quickResponse
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