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33 <br />O tions <br />For these applications we considered the following HVAC systems: <br />Richard_E~Whitked_Humar~ Services Center <br />• Packaged or Split Direct Expansion (DX) <br />• Water Soun~ Heat Pumps with Evaporative Cooler and Hot Water Boiler <br />• Fan Coil/Unit Ventilator with Air-cooled Chiller and Hot Water Boiler <br />• Multi-zone with Air-cooled Chiller and Hot Water Boiler <br />• Variable Air Volume (VAV) with Air-cooled Chiller and Hot Water Bailer <br />Northem Human Services Center <br />• Through-the-wall Type Packaged Terminal Air Conditioning (PTAC) Units <br />• Packaged or Split Direct Expansion (DX) <br />• Water Source Heat Pumps with Evaporative Cooler and Hot Water Boiler <br />• Fan CoiVUnit Ventilator with Air-cooled Chiller and Hot Water Boiler <br />• Multi-zone with Air-cooled Chiller and Hot Water Boiler <br />• VAV with Air-cooled Chiller and Hot Water Boiler <br />• Packaged Rooftop Type-Multi-zone (PRTU-MZ) <br />• Packaged Rooftop Type-VAV (PRTU-VAV) <br />• Window Air Conditioning System (units) with Steam Boiler and Finned Radiation Heating <br />Thermal Storaae <br />We have considered the use of a thermal (ice) storage system for use at each of the <br />facilities. Our conclusion is that the electrical costs to create ice for storage at night exceeds <br />any demand charge savings under the current electrical power rate schedule. Since it will <br />actually cost mare to operate the system through its implementation, we do not recommend <br />the installation of an ice thermal storage system. This is discussed in mare detail in our <br />analysis. <br />Solar Heating Systems <br />We have also considered the use of solar heating systems for use at each of the facilities. <br />Solar heating could be considered as a supplement to the conventional heating system, but <br />would not be able to meet the entire heating needs at either location. Our conclusion is that <br />the initial capital costs to install a solar system would not provide a payback within a <br />reasonable period of time. <br />Also, solar heating is best incorporated into a building during the initial design. A design <br />approach that considers the whole-building design would consider solar heating within the <br />context of the entire building envelope, including windows, daylighting, and the HVAC <br />system(s). Orange County may wish to investigate solar heating fvr domestic hot water <br />needs, especially at the Northern Center. <br />The following pages provide descriptions of each of the systems considered. <br />(33) <br />