Engineered Systems - April 2008 - (Page 17)

CaseInPoint Retrofit makes 35% fuel savings a habit for Dominican Sisters Standard Plumbing Heating Controls Corporation of Spokane, WA, recently designed a new heating and domestic hot water system for the Dominican Center, which was constructed in 1969 to house the Dominican Sisters, who work with charity organizations worldwide to help troubled women and victims of abuse and addiction. Originally designed with a separate boiler room located 150 ft away from the main building, the heating plant housed a 3 million Btuh ﬁretube boiler. The steam was piped underground from the boiler room across the entire length of the building to a steam-to-water converter located 350 ft away, where water was heated at 120°F to 180° to heat the building. The building that housed the boiler room also produced domestic hot water for the center, which was stored and maintained at 150° in a 546-gal tank before being piped to the main building. LUKEWARM INSTEAD OF COLD “While the equipment had been well maintained and the piping was in good condition, a signiﬁcant amount of heat was being lost in many unwanted areas, causing the cold water to run lukewarm and the crawl spaces and storage areas to become unbearably hot,” explained Dave Ressa, the center’s the facilities manager. “We estimated that the steam boiler was running at an efﬁciency of 60%, so for each one million Btu of natural gas, the boiler used only 600,000 Btuh to make steam and the other 400,000 Btuh was lost to venting, piping, or the air in the boiler room.” Designer Don Smet chose two Lochinvar KNIGHT Boilers with 500,000 Btuh and 95% thermal efﬁciency to heat the building; in addition, he selected a Lochinvar ARMOR Water Heater with 399,000 Btuh and up to 98% efﬁciency and a new ASME 100-gal insulated storage tank to supply domestic hot water for the entire building and kitchen. As Smet explained, “We accessed the existing four-in. water heating loop by welding two closely spaced two-and-a-half-in. tees and valves behind the boilers using a primary/secondary conﬁguration. The two boilers were then piped in cleanly and easily, utilizing their own circulating pumps.” FREE INFO: 8 FREE INFO: 137 w w w. esmag a zin e . c o m 17 http://www.marsair.com http://www.marsair.com http://www.automatedbuildings.com http://www.esmagazine.com

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Engineered Systems - April 2008 Contents Editor’s Note Back2Basics HVAC Challenge Case In Point Commissioning Building Automation Energy Wiz HVACR Designer Tips This Time, Water Cooled Was All Wet Cleanroom Design In 10 Easy Steps It's Not The Heat, It's The Humidity Issues & Events Computers and Software Products Glossary Classifieds Advertiser Index Tomorrow’s Engineer

Engineered Systems - April 2008

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