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High-Efficiency AC Replacement Measures: 2006-08 M&V Analysis and Program Insights

This document presents a comprehensive analysis of high-efficiency air conditioning (AC) replacement measures as part of the Measurement and Verification (M&V) programs from 2006 to 2008. It explores different program types, including downstream and upstream replacements, with a focus on gross and net savings evaluations. Key methodologies include Monte Carlo simulations for cost-benefit analysis, as well as robust data collection on AC performance relative to manufacturers' standards. The study incorporates factors like building characteristics and participant surveys to enhance the accuracy of savings estimates.

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High-Efficiency AC Replacement Measures: 2006-08 M&V Analysis and Program Insights

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  1. HVAC MeasuresHigh Efficiency AC Replacement M&V Jarred Metoyer

  2. 2006-08 Measurement and Verification • Programs vary by IOU • Pure Upstream – Replace on burnout • Upstream – Early Replacement • Downstream – Early Replacement • All DEER Measures

  3. 2006-08 Measurement and Verification • Sampling and Uncertainty • Monte Carlo simulations to inform cost-benefit analysis for instrumentation • Assumed larger variation in usage than standard assumptions, larger samples • Samples proportional to savings by IOU and by climate zone

  4. 2006-08 Measurement and Verification • Gross Savings • Unit level performance analysis to inform DEER modeled savings • Measure replacement AC performance relative to manufacturers’ performance • Re-run the DEER models

  5. 2006-08 Measurement and Verification • Data Collection • HVAC unit input power and supply, return and ambient air temperature are logged onsite for several months post installation • Spot power and temperature measurements and airflow are also taken during the initial site visit • Contextual data includes plug loads, lighting, mechanical equipment, setpoint schedules, building characteristics and AC nameplate info

  6. 2006-08 Measurement and Verification • Net Savings • Uses a self report NTG survey • Supplemented by vendor/contractor interviews • Participant spillover and freeridership • Uses a common set of questions and scoring procedure to ensure uniformity

  7. References • Southern California Edison Design & Engineering Services, “EER & SEER As Predictors of Residential Seasonal Cooling Performance.” December 15, 2005 • RLW Analytics, “Evaluation, Measurement, and Verification of the 2004 & 2005 California Statewide ENERGY STAR® New Homes” July 18, 2007 • Itron, Inc. “Statewide Express Efficiency and Upstream HVAC Program Impact Evaluation” December 31, 2008

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