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Staff Summary of Robson and Woese HVAC System Life Cycie Analysis <br />Richard E. Whiffed and Northern Human Services Center <br />The Need <br />^ Existing HVAC systems: <br />o Do not meet modern standards for air quality; <br />o Are at or beyond their useful life; <br />o Have increasingly high maintenance costs; <br />o Are not energy efficient. <br />The Approach <br />^ In June 2000, the BOCC approved a feasibility study to determine the most economically <br />efficient HVAC system based on life cycle costs for the Richard E. Whiffed and Northern <br />Human Services Center. The following criteria were used to identify and evaluate a <br />range of potential systems for consideration: <br />1. energy cost; <br />2. ease of maintenance; <br />3, controllability; <br />4. initial cost. <br />Robson and Woese initially considered a wide range of HVAC systems, including: <br />• Fan .Coil/Unit Ventilator with Air-cooled Chiller and Hot Water Bailer <br />• Multi-zone with Air-cooled Chiller and Hot Water Boiler <br />• Packaged or Split Direct Expansion (DX) <br />• ,Packaged Rooftop Type-Multi-zone (PRTU-MZ) <br />• Packaged Rooftop Type- Variable Air Volume (PRTU-VAV) <br />• Solar <br />• Thermal Storage <br />• Through-the-wall Type Packaged Terminal Air Conditioning (PTAC) Units <br />• Water Source Heat Pumps with Evaporative Cooler and Hot Water Boiler <br />• Variable Air Volume (VAV) with Air-cooled Chiller and Hot Water Boiler <br />• Window Air Conditioning System (units) with Steam Boiler and Finned Radiation Heating <br />Findings <br />A short list of system fvr further consideration was developed for each location. A detailed <br />analysis of each of these systems was performed. The following tables summarize the findings <br />of this analysis: <br />