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Modeling Multifamily Heating Energy Use

This document discusses the challenges faced by the RTF in calibrating the Multifamily Weatherization UES. With identified discrepancies in the Model’s efficacy, the preference for the SEEM model is under scrutiny due to its limitations in accommodating multi-zone modeling. This analysis highlights the need for clear direction on modeling software, the benefits and drawbacks of SEEM, and the potential advantages of a multi-zone approach to accurately reflect heating behaviors in multifamily units. The aim is to capture more precise savings estimates and better inform future energy efficiency measures.

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Modeling Multifamily Heating Energy Use

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  1. Modeling Multifamily Heating Energy Use Can SEEM be used, or do we need to use a multi-zone model? Regional Technical Forum January 17, 2011

  2. Background • MF Weatherization UES is “out-of-compliance” due to lack of model calibration • In the RTF’s “Multifamily Weatherization UES Scoping Study (Phase 1),” SBW identified 5 studies that would provide useful data for calibration • See link to memo on MF Weatherization UES measure page • In “Phase 2,” the RTF will hire a contractor to use those 5 studies to perform a calibration exercise. • The SOW should specify the preferred model. • RTF-staff preference = SEEM • At the December 2011 RTF meeting, there was concern regarding using SEEM for multifamily buildings

  3. Background (2) • Definition: Multifamily • More than 4 units; and • 3 floors or less above grade • Prototypes • Townhouse on Crawlspace • 12 units • 3 stories • 1500 ft2 per unit • Townhouse on Slab (same specs) • Apartment Building (Double-loaded corridor) • 24 units • 3 stories • 1000 ft2 per unit • Measures • Insulation (Attic, Floor, Walls) • Windows

  4. Use SEEM or not? • Benefits of using SEEM • Consistent with other RTF work • Simple • Easily documentable • Negatives of using SEEM • Doesn’t allow for multi-zone modeling

  5. Discussion • What would we expect to get from multi-zone modeling that single-zone modeling wouldn’t provide? • Will ability to model individual apartments allow better savings estimates? • Common area heating setpoint & infiltration rates • Vary heating setpoint across units to account for different behavior (including vacancies) • What data would we need for model inputs?

  6. What’s Needed from RTF… • Clear direction regarding modeling software to use for the Multifamily Weatherization UES measures and attempted calibration exercise.

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