Agenda - 06-05-2001-9e - Laserfiche WebLink

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31 HVAC System Life Cycle Analysis Richard E. Whiffed and Northern Human Services Buildings County of Orange June 5, 2Q01 EXECUTIVE SUMMARY Purpose Orange County contracted Robson 8~ Woese, Inc. Consulting Engineers to perform a life cycle cost analysis on the replacement of heating, ventilation, and air conditioning (HVAC) systems at the :Richard E. Whiffed Human Services Center and the Northem Human Services Center. The analysis was intended to: mallow the County to select appropriate HVAC systems that :are energy efficient, economical on a life cycle basis, and improve the indoor air quality (IAQ) for occupants and users. preview the existing HVAC facilities construction, determine systems deficiencies, propose and evaluate various HVAC systems as replacement options. The existing systems are approaching the end of their useful lives and replacement should be planned far at this time. Additionally, the building usage and indoor air quality standards have changed dramatically since the systems were installed. The analysis is intended to assist the County The analysis is to be the basis of systems document. in its selection of appropriate HVAC systems. design. It is not intended to be a design Recommendations The Richard E. Whiffed Human Services Center is heated and cooled by a central boiler and chiller plant with a variable air volume (VAV) distribution system serving the main building and the east wing. The Recreation Department building is served by the central boiler. Window units provide cooling for the main floor. The gymnasium is not served with cooling at this time. Robson and Woese recommends providing a new variable air volume system for the main building and east wing, with a constant volume HVAC system for the recreation building. All buildings would be supplied with hot water heating from a central boiler plant and chilled water from a central air cooled chiller plant. The Northem Human Services Center is heated by a central steam boiler utilizing finned tube radiation and unit heaters. Individual window air conditioning units serve roams other than the cafeteria, which has a split system air conditioning unit. Robson and Woese "recommends providing a new variable air volume system for the rooms, with a constant volume HVAC. system far the gymnasium and cafeteria. Heating would be supplied from a central hot water boiler and chilled water from a central air cooled chiller. (31)