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Special Topics, Mechanical Systems
Special Topics, Nonresidential Compliance Modeling Topics
ASHRAE 90.1 Performance Module
See Also: ASHRAE 90.1 Performance Calculation Options, ASHRAE 90.1 Performance Calculation Results,
and ASHRAE 90.1 Performance Reports
EnergyPro’s ASHRAE 90.1 Performance module for nonresidential projects allows you to document project
performance with ASHRAE 90.1: 2004 and 2007 versions. EnergyPro uses the Performance Rating Method,
as defined in Appendix G of the standard to model the building energy performance.
While the 2007 version is the most recent version of the standard, the 2004 version is considered the
commercial building reference standard for state building energy codes under the federal Energy Policy Act of
2005. The Act also requires all federal facilities to exceed ASHRAE 90.1-2004 by 30%, provided it is costeffective to do so. In addition, USGBC’s LEED rating system, references the 2004 version of the standard.
To select which version of the standard EnergyPro will use to create the baseline energy (and energy cost)
data, select Options… from the Tools menu. Select the appropriate version of the ASHRAE 90.1 standard
and Title 24 standard from the drop-down list on the Miscellaneous Tab.
ASHRAE 90.1 Performance Rating Method (Appendix G):
EnergyPro’s ASHRAE 90.1 Performance module uses the Performance Rating Method specified in Appendix
G of the standard, to create an hourly simulation to generate the baseline and proposed energy use and cost
data. EnergyPro automatically creates the baseline data required by the standard as well as the proposed
design data.
To calculate the baseline data, Appendix G requires the building to first be modeled at its actual orientation,
then it must be rotated by 90, 180, and 270 degrees. The baseline against which the proposed design is
compared is the average of the four runs, calculated automatically by the program. EnergyPro displays the
end-use energy usage results for each orientation, automatically calculates the average, and displays both
the baseline and the proposed energy cost estimates and the margin between the baseline and proposed
design.
Refer to the ASHRAE web site to obtain additional details and/or copies of the ASHRAE 90.1-2004 of 2007
Standards.
ASHRAE Policy Statement
ASHRAE 90.1 Performance Results
See Also: ASHRAE 90.1 Performance Calculation Module, ASHRAE 90.1 Performance Calculation Options,
and ASHRAE 90.1 Performance Reports
When the calculation is complete, the display summarizes the results of the NR 90.1 Performance calculation
according to category of energy end use. The NR 90.1 Performance Baseline Annual Site Energy Use
Estimate (in kBtu/sqft-yr) is shown for each orientation, and the Proposed Building Total energy use.
All calculation results displayed are for the building as a whole in kBtu/sqft-yr. Categories of energy end use
are as follows:
Heating:
Annual energy used for space heating
Cooling:
Annual energy used for space cooling
Lighting:
Annual energy used for electric lights
Process Lighting: Annual energy used in process lighting input within the program
User's Manual EnergyPro Version 5
Building Tree • 113