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New Construction: Small Office Prescriptive Path

This presentation outlines the energy efficiency standards and prescriptive paths for small office buildings, including measures for HVAC systems, lighting, windows, and integrated design. Key specifications include a lighting power budget of 0.75 W/ft², the use of occupancy sensors, efficient window ratings (U-0.35/SHGC-0.30), and various HVAC system options. The guidelines aim to achieve significant energy savings (estimated at 2.0 kWh/sq.ft-yr) while ensuring cost-effectiveness. Developed by industry experts, these standards are targeted at buildings three stories or less and under 100,000 square feet.

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New Construction: Small Office Prescriptive Path

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  1. New Construction: Small Office Prescriptive Path

  2. RTF Presentation Outcome • RTF Deemed Measure (Package) • HVAC Efficiency – CEE Tier II • Lighting Power Budget – 0.75 w/ft2 • Lighting Controls – Occupancy sensors • Efficient Windows – U-0.35/SHGC-0.30 • Integrated Design – Capacity reduction • Enhanced OSA Economizer

  3. Measure Criteria • New Office Building/Addition/Remodel • 3 Stories or Less • Maximum of 100,000 Square Feet • Maximum 40% Window/Wall Ratio • One of Four HVAC System Types • Packaged Roof-top VAV • Electric reheat • Hot water reheat (gas boiler) • Packaged Air-Source Heat Pump • Packaged Roof-top w/Gas Furnace

  4. Package Summary • Best Available Information • Estimated Energy Savings: • 2.0 kWh/sq ft-yr (see Charlie’s summary) – approx. 20% electric energy/15% total energy • Estimated Cost: • Avg. $1.2/sq ft (see Charlie’s summary) – approx. 1% construction cost increase • Cost Effectiveness: • > 1.2 B/C Ratio (see Charlie’s analysis)

  5. Background • RTF Subcommittee - Charlie Grist, Michael Mann, David Hales, Ken Eklund, Jill Steiner, Tim Steele, Mira Vowles, and Will Miller. Consultants Mark Frankel, Brian Thornton and David Baylon. • One-year in development • 17 Meetings • Based on NBI Advanced Building Guidelines • Subset of ABG Measures • Limited to electric energy and cost-effective • Additional NW weather sites (five) and comparison energy codes (four)

  6. Background (cont.) • Key components • Impact Evaluation • Under Development • Measure Specifications • NBI to Develop by 9/30/07 • Incorporate duct system design/layout and HVAC system sizing guidelines • Specify Commissioning - Checklist

  7. Background (cont.) • Timing: • Target Small Office – add other building types to match ABG over time. • Add to PTR system for 10/1/08 revision.

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