Executive SummaryThis report presents a methodology for modeling air infiltration in EnergyPlus to account for envelope air barrier characteristics. Based on a review of various infiltration modeling options available in EnergyPlus and sensitivity analysis, the linear wind velocity coefficient based on DOE-2 infiltration model is recommended. The methodology described in this report can be used to calculate the EnergyPlus infiltration input for any given building level infiltration rate specified at known pressure difference. The sensitivity analysis shows that EnergyPlus calculates the wind speed based on zone altitude, and the linear wind velocity coefficient represents the variation in infiltration heat loss consistent with building location and weather data. EnergyPlus infiltration input is calculated to be 0.2016 cfm/sf of exterior wall area, assuming that uncontrolled air leakage through the building envelope can be specified by a baseline leakage rate of 1.8 cfm/sf (@ 0.30 in. w.c) of exterior above grade envelope area (based on ASHRAE SSPC-90.1 Envelope Subcommittee recommendation).

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This report analyses the content of the 2003 Commercial Building Energy Consumption Survey (CBECS) (DOE EIA 2003) to determine the most typical heating, ventilating, and airconditioning (HVAC) equipment in use in 15 different building types. Two sets of recommended HVAC systems are developed-one for post-1980 buildings and one for pre-1980 buildings. The recommendations are listed below in tables S-1 and S-2.