Create BEM EXISTING BUILDING VERIFICATION METHODOLOGY

BEM EXISTING BUILDING VERIFICATION METHODOLOGY

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+EXISTING BUILDING VERIFICATION METHODOLOGY FOR WATTCARBON
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+ENERGY ATTRIBUTE CREDITS (EACS) AND ENERGY ATTRIBUTE TRACKING SYSTEM (WEATS)
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+INTRODUCTION
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+AUROS Group developed the following existing building EAC verification methodology to be used in
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+the WEATS platform for the transaction of operational carbon savings from the decarbonization of
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+existing buildings. This methodology is intended to be used when buildings do not have metered,
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+hourly consumption data. Using calibrated, physics-based dynamic whole-building simulation energy
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+models, authenticated hourly consumption metrics can be simulated and generated.
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+DEFINED TERMS
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+Building Energy Model (BEM) is a physics-based software simulation that dynamically (8760) predicts
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+a building\'s hourly energy use. BEM takes input from a variety of sources, including, but not limited
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+to, building geometry, construction materials, lighting, HVAC, refrigeration, water heating, and
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+renewable generation systems, component efficiencies, control strategies, building use and operation
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+schedules, and local weather. Acceptable BEM software are IES VE, eQuest, and EnergyPlus.
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+Baseline BEM (BEM baseline ) is a representative BEM of the existing building using a Time Period of
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+carbon emissions prior to decarbonization mitigation. The BEM is calibrated as defined in Model
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+Calibration within the limits of ASHRAE Guidelines 14-2023 using meteorological hourly weather data
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+for the same Time Period.
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+Betterment BEM (BEM betterment ) is a representative BEM of the existing building using a Time Period of
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+carbon emissions after decarbonization mitigation. The BEM is calibrated as defined in Model
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+Calibration within the limits of ASHRAE Guidelines 14-2023 using meteorological hourly weather data
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+for the same Time Period.
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+Model Calibration according to ASHRAE guideline 14-2023 Section 4.3.2.4 Whole-Building Calibrated
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+Simulation Performance Path requires minimum acceptable model calibration of a normalized mean
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+bias error (NMBE) of 5% and a coefficient of variation of the root-mean-square error of (CV\[RMSE]) of
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+15% relative to monthly calibration data.
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+Time Period is any consecutive 12-month period of time where acceptable utility consumption data is
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+available for all forms of energy used within the building.
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+Source Data represents meteorological hourly weather data used in the BEM and consumption data
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+for all forms of energy from monthly utility consumption data, metered, hourly consumption data, or
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+another data source, approved by WattCarbon, that represents actual building performance for the
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+representative Time Period.
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+VERIFICATION METHODOLOGY FOR BUILDING DECARBONIZATION
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+When metered, hourly consumption data is not available for existing buildings, calibrated physics-
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+based dynamics whole-building simulation energy BEM models can be used to generate
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+authenticated hourly consumption data for transactional purposes.
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+The intent of using BEM models is to simulate and generate authenticated EAC (EAC a ) hourly
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+consumption data for the WEATS platform for all buildings that do not have metered, hourly
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+consumption data. This verification methodology reliably converts monthly utility data to transactable,
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+authenticated hourly consumption data using proven building science technology.
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+The mathematical methodology for the hourly time series data is as follows:
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+BEM baseline – BEM betterment = EAC a