ComStock Reference Documentation (V.1)

Abstract

has been improved upon through work for parties outside of DOE, most notably the Los Angeles Department of Water and Power, where support and feedback from Armen Saiyan has been instrumental in key improvements to the tool. Lastly, ComStock would not be possible without the EnergyPlus TM whole-building energy modeling tool and the OpenStudio ® Software Development Kit, two pieces of software that are the result of many years of hard work by a large number of people at DOE, the national laboratories, and the private sector. v This report is available at no cost from the National Renewable Energy Laboratory (NREL) at www.nrel.gov/publications List of AcronymsAAMA American Architectural Manufacturers Association AC air conditioner or air conditioning ACC air-cooled chiller ADA Americans with Disabilities Act AER average emissions rate AFUE annual fuel utilization efficiency AHU air handling unit AMI Advanced Metering Infrastructure AMY actual meteorological year ASHP air-source heat pump ASHRAE American Society of Heating, Refrigerating and Air-Conditioning Engineers AWS Amazon Web Services BAS building automation system BEM building energy model BPR base-to-peak ratio BTU British thermal unit CAEUS California End Use Survey CAPFT capacity as a function of temperature CBECS Commercial Buildings Energy Consumption Survey CBSA Commercial Building Stock Assessment CEC California Energy Commission CEJST Climate and Economic Justice Screening Tool CFL compact fluorescent light cfm cubic feet per minute CHW chilled water CMU concrete masonry unit COP coefficient of performance CPUC California Public Utilities Commission CU coefficient of utilization CW condenser water CZ climate zone DCV demand control ventilation

End-Use Savings Shapes Measure Documentation: Thermostat Control for Load Shifting in Large Offices

“…For times outside of the event, the existing thermostat schedules in the model are unchanged. The details of the thermostat schedule in the existing ComStock models can be found in Section 4.2 "Hours of Operation and Occupancy," which determines building hours of operation, and Section 4.8.7 "Thermostat Set Points," which describes how thermostat setpoints/setbacks are applied to the schedule, in the ComStock Reference Documentation [32].…”

End-Use Savings Shapes Measure Documentation: Dispatch Schedule Generation for Demand Flexibility Measures

“…This is likely sufficient for this study since demand response measures are not yet deployed at scale, so their impact at the stock level is likely minimal at this time. The existing baseline schedules (e.g., thermostat setpoint schedules) in ComStock are based on a building automation data from three industry-provided private data sources with over 3,700 buildings, described in detail in the "ComStock Documentation" report [26]. The output schedule from the dispatch schedule generation method described in this document will serve as the input for specific demand flexibility measures applied to certain systems, and the detailed baseline descriptions will be provided in the corresponding measure documents on the ComStock webpage-Thermostat Control for Load Shedding and Thermostat Control for Load Shifting.…”

End-Use Savings Shapes Measure Documentation: Advanced Rooftop Unit Control

“…Packaged single-zone systems are modeled in ComStock with "load-based" control, in which a part-load ratio is calculated reflecting the required run time of the heating or cooling coil to meet the load at design airflow, sized separately for heating, cooling, and ventilation modes (US Department of Energy, 2022). Fans operate continuously during the building's occupied hours, with unoccupied operation assigned to one of three schemes (scheduled on during unoccupied hours, cycling to meet setpoint with ventilation during unoccupied hours, and cycling to meet setpoint without ventilation during unoccupied hours) based on a probability distribution (Parker, 2023).…”