Engineered Systems - March 2008 - (Page 54)

On A Mission This photo shows the setting of the second half of the chiller module. Each section came with the chillers installed, chilled water pumps, VFDs, and electrical panels. To meet the demands of the schedule the piping, valves, flanges, and welding were completed on the ground. The pipe was lifted in place, set on pipe supports and bolted to the equipment via the flanges at each inlet or outlet. tenance on the existing plant for many years, but as a D-B firm, Mesa was able to offer broader options, based on the inn’s projected load profile, as compared with the single-source solutions proposed by two HVAC manufacturers. A MODULAR SOLUTION A modular solution was selected for two main reasons: the fast-track nature of the project and the unique site. Given that the site is located in a historic area of Riverside, Mesa consulted with the City of Riverside’s Historic Preservation Office and worked with an independent architect, Diane White, to identify a solution with an aesthetically compatible design. It was also necessary to design the layout of the central plant to maintain a small footprint, reserving the most land possible for future expansion of the innís annex. The modular solution helped meet both objectives. And, thanks to the partnering relationship, the usual sixweek historical review process was completed in less than two weeks. Mesa specified a modular central plant with remote cooling tower to be pre-built by the manufacturer, shipped in two sections, and bolted together at the rear of the annex site and adjacent parking garage deck. The selected systems inlcude the following components: • Modular central plant with a total capacity of 600 tons consisting of two centrifugal water cooled chillers with factory-mounted variableflow drives; • Two new stainless steel induced draft counter-flow design, two-cell cooling towers designed to cool 2,000 gpm of water (from 95°F to 85° at 74° entering wetbulb temperature, and VSDs for the fans; • Three frame-mounted, end-suction primary chilled water pumps and two frame-mounted, end-suction condenser water pumps, all with VSDs; • Cooling tower filtration and chemical feed system; • Chilled water system expansion tank and air separator; • Two electric fancoil units for central plant A/C; • Ventilation fan with gravity back-draft damper sized for refrigerant This photo depicts the installation of the pipe. Only one tower was available at the time, with the isolation valves installed and connected to the second tower time when it was available to set. evacuation per ASHRAE 15; • Central plant refrigerant monitoring system; • Magnetic flow meter for flow monitoring of main chilled water distribution; • Six automated isolation control valves. AIMING FOR AN ENERGY STAR RATING Even with the additional capacity, power usage will still be less than the existing plant due to built-in redundancy and the fact that VSD 54 En gi neer ed S y stem s March 2008

Table of Contents Feed for the Digital Edition of Engineered Systems - March 2008

Engineered Systems - March 2008 Contents Editor’s Note Back2Basics HVAC Challenge Case In Point Commissioning Building Automation Energy Wiz HVACR Designer Tips Application Checklist Exemplary Design = Elementary Success The Modern Unit Ventilator On A Mission VAV Systems And Green Design – Part II Issues & Events Products Glossary Classifieds Advertiser Index Tomorrow’s Engineer

Engineered Systems - March 2008

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