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Enhancing Portable Classroom Controls: A Project Overview and Energy Cost Analysis

This report details a portable classroom controls project initiated on April 27, 2007, focusing on upgrading thermostat controls for 127 portable classrooms. The project involves connecting these thermostats to the District's DDC, enabling remote management and scheduling. Key findings include avoided electricity costs and variable rebate opportunities through PSE’s rebate program. The analysis illustrates a significant reduction in peak demand and costs, estimating annual savings of $43,314. The project achieved a payback period of 1.9 years after rebates.

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Enhancing Portable Classroom Controls: A Project Overview and Energy Cost Analysis

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  1. Portable Classroom Controls Project Chuck Collins RCM Meeting April 27, 2007

  2. 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

  3. 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

  4. 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

  5. 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

  6. After-project analysis using PSE’s EIS March 2005 through February 2007

  7. Weekly analysis shows weekend shutdown Feb 24, 2007 through April 24, 2007

  8. Daily profile 2005: High peak, runs during night hours First week of March, 2005

  9. Daily profile 2006: Systems running 24/7 First week of March, 2007

  10. Daily profile shows lower demand, lower night consumption First week of March, 2007

  11. 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%

  12. 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%!

  13. 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)

  14. 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

  15. Thank you!! • Questions??

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