Engineered Systems - March 2009 - (Page 41)

www.dedietrichboilers.com Basics For Absorption Chillers 1 Condensor 0.10 0.09 0.08 2 Expansion 0.07 0.06 Pressure (ATM) 0.05 0.04 0.03 4 Absorber 0.02 3 Evaporator 0.01 0 0 40 60 80 100 120 140 160 180 200 220 240 260 ˚F 5 Generator concentrator As the Boiler Should Be!!! 6 Solution heat exchanger GT SERIES NEAR CONDENSING CAST IRON BOILERS Diagram 1. Single-effect Duhring diagram. • Evaporator waterside fouling factor: 0.0001 • Tube-side fouling factor (steam): 0.000 (indirect fired) • Tube-side fouling factor (hot water): 0.0001 (indirect fired) It is very important to understand that chillers rarely operate at their maximum capacity. ARI used typical building types and operations in 29 different cities to develop a chiller loading profile during a typical year. The resulting chiller loading profile is at 100% capacity about 1% of the time, 75% capacity about 42% of the time, 50% capacity about 45% of the time, and 25% capacity about 12% of the time. These values are incorporated into the IPLV equations, which are: IPLV = 0.01A + 0.42B + 0.45C + 0.12D (coefficient of performance [COP]) where: A = COP at 100% capacity (condenser water at 85° ) B = COP at 75% capacity (condenser water at 77.5° ) C = COP at 50% capacity (condenser water at 70°) D = COP at 25% capacity (condenser water at 70°) IPLV = 1 (MBtuh/ton) where: (0.01/A) + (0.42/B) + (0.45/C) + (0.12/D) A = MBtuh/ton at 100% capacity (condenser water at 85° ) B = MBtuh/ton at 75% capacity (condenser water at 77.5°) C = MBtuh/ton at 50% capacity (condenser water at 70°) D = MBtuh/ton at 25% capacity (condenser water at 70°) When evaluating different chiller energy usage, the IPLV provides the most accurate average chiller energy usage. When the known parameters are different than prescribed above, the c ABSOLUTELY THERMAL SHOCK PROOF!!! GUARANTEED!! c True Eutectic Cast Iron = flexibility in the casting c +88% Thermal Efficiency c Lowest Pressure Drops c Best Warranty in the Industry c 33 Models Ranging from 94 to 6,200 MBH c 90 PSI Working Pressure c Low NOx Burners Available c In Stock, Next Day Delivery!! WHEN YOU TH!NK BOILERS TH!NK Input 219 at www.esmagazine.com/instantproductinfo w w w. esmag a zine . c o m 41 http://www.dedietrichboilers.com http://www.dedietrichboilers.com http://www.esmagazine.com/instantproductinfo http://www.esmagazine.com

Table of Contents Feed for the Digital Edition of Engineered Systems - March 2009

Engineered Systems - March 2009 Contents Editor’s Note Back2Basics Case In Point Commissioning Building Automation HVACR Designer Tips Application Checklist Teaching An Old School New Tricks Basics For Absorption Chillers A New Haven For Sustainable Schools Glossary Classifieds Advertiser Index Tomorrow’s Environment

Engineered Systems - March 2009

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