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Portable Classroom Controls Project. Chuck Collins RCM Meeting April 27, 2007. The portable classroom. Time clock User control Electric heating No scheduling capability Electric heat pumps No A/C Exhaust fans Limited windows No demand charges. Part of PSE rebate program for schools.
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Portable Classroom Controls Project Chuck Collins RCM Meeting April 27, 2007
The portable classroom Time clock User control Electric heating No scheduling capability Electric heat pumps No A/C Exhaust fans Limited windows No demand charges
Part of PSE rebate program for schools • List of eligible equipment • Variable rebate amounts depending on which pieces of equipment installed • Application for rebate • Rebate amount is close to cost of controller
Portable classroom control project process • Project research (cost/benefits, other data) • Make pitch to organization • Rebate application, work with PSE early • Find a contractor to do the work • Commence with project • Set up temperature set-points, times, etc • Verify avoided costs, consumption • Receive rebate
The Project • 127 portable classrooms • Upgraded thermostat controller • Connected to District DDC through network • Control setpoints via DDC system • Can verify temps, setpoints, trends, etc • Ability to remotely shut down all portables • Scheduling, snow day, etc
After-project analysis using PSE’s EIS March 2005 through February 2007
Weekly analysis shows weekend shutdown Feb 24, 2007 through April 24, 2007
Daily profile 2005: High peak, runs during night hours First week of March, 2005
Daily profile 2006: Systems running 24/7 First week of March, 2007
Daily profile shows lower demand, lower night consumption First week of March, 2007
Avoided electricity calculations • Mar 2005 • Cost - $75.22 • kWh – 942.26 • Mar 2006 • Cost - $182.72 • kWh – 2,391.50 • Mar 2007 • Cost - $62.97 • kWh – 766.45 942.26 + 2391.50 2 = 1,666.9 – 766.45 = 900 kWh per year or 54%
Avoided cost calculations • Mar 2005 • Cost - $75.22 • kWh – 942.26 • Mar 2006 • Cost - $182.72 • kWh – 2,391.50 • Mar 2007 • Cost - $62.97 • kWh – 766.45 $75.22 + $182.72 2 = $128.97 - $62.97 = $66.00 per year or 51%!
Avoided cost survey • 18 portables at various sites (14% of total) • Used PSE’s Energy Interval Service for data • Total electricity cost March 2006: $2,468.39 • Total electricity cost March 2007: $1,854.49 • Avoided monthly cost for sample: $613.90 • x 10 months: $6,139.00 annual avoided cost • / 18 portables = $341.05 per portable, per year • x 127 portables = $43,314.05 (estimated annual avoided cost, based on survey)
Total cost/benefit • Estimated annual savings: $43,314 • Total project cost: $110,642 • Simple payback (no rebate): 2.6 years • PSE rebate: $29,750 • Actual project cost: $110,642 - $29,750 = $80,892 • Simple payback (with rebate): 1.9 years
Thank you!! • Questions??