ASHRAE 90.-1 2004 Appendix G - Building Energy Codes

131 Pages·2008·3.62 MB·English

ASHRAE 90.1-2004
Appendix G
Performance Rating Method
Presented By
Michael Rosenberg, Pacific Northwest National Laboratory
1
Federal Building Energy
Efficiency Standard Overview
• Energy Policy Act of 2005 (Section 109) requires
new federal buildings meet a target of at least

30% energy savings (compared to ASHRAE 90.1.
2004), if cost-effective
• Rules Found in:
10 CFR Part 433 – effective January 3, 2007
(cid:190)
Rules require use of ASHRAE 90.1-2004 Appendix G
(cid:190)
2
Performance Rating Method
Overview
• ANSI/ASHRAE/ IESNA
Standard 90.1-2004

Prevailing private sector energy
(cid:190)
standard for commercial and
high-rise multi-family residential
buildings
3
Performance Rating Method
Overview
• Appendix G
(cid:190) Appendix chapter to ASHRAE
Standard 90.1
A modification of Energy Cost
(cid:190)
Budget (ECB)
• ECB
(cid:190) Modeling rules designed to show a
building that doesn’t meet prescriptive
requirements, will have an equivalent
energy cost to a building that meets
those requirements.
Not Flexible
(cid:190)
4
Performance Rating Method
Overview
• Appendix G - Modeling rules for
rating buildings that are designed

to be substantially “Better Than
Code”
Built-in Flexibility
(cid:190)
• Incorporates standard practice as
well as code requirements

• Allows more discretion by the
“Rating Authority”

5
Performance Rating Method
Overview
• Used For “Beyond Code
Programs”

LEED
(cid:190)
Utility Programs
(cid:190)
EPACT 2005 Federal Tax
(cid:190)
Incentives
Federal Buildings energy
(cid:190)
efficiency requirements
from EPACT 2005
6
Performance Rating Method
Overview
LEED EA Credit 1 - OPTION 1 – WHOLE BUILDING
ENERGY SIMULATION (1-10 Points)
“Demonstrate a percentage improvement in the
proposed building performance rating compared to the
baseline building performance rating per
ASHRAE/IESNA Standard 90.1-2004 (without
amendments) by a whole building project simulation
using the Building Performance Rating Method in
Appendix G of the Standard.”
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Performance Rating Method
Overview
EPACT 2005 - Federal Tax Incentives for
Commercial Buildings
“The energy performance of the Reference Building
shall be determined by following the methods for
baseline building performance in the PRM in
Appendix G of Standard 90.1-2004.”
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Performance Rating Method
Overview
10 CFR Part 433—Energy Efficiency Standards For
The Design And Construction Of New Federal
Commercial And Multi-Family High-Rise Residential
Buildings
“Each Federal agency shall determine energy consumption
levels for both the baseline building and proposed building by
using the Performance Rating Method found in Appendix G of
ANSI/ASHRAE/IESNA Standard 90.1–2004, Energy Standard
for Buildings Except Low-Rise Residential Buildings.”
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Performance Rating Method
Overview - Terminology
Proposed Design
•
“A computer representation of the actual proposed
building design or portion thereof used as the basis for
calculating the design energy cost”
matches the actual design – with some limitations
(cid:190)
Baseline Design
•
“A computer representation of a hypothetical design
based on the proposed building project. This
representation is used as the basis for calculating the
baseline building performance for rating above-
standard design”
just meets code and standard practice
(cid:190)
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