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Evaluating AERMOD and Wind
Tunnel Derived Equivalent
Building DimensionsGuideline on Air Quality Models: The New Path
A&WMA’s 6th Specialty Conference - Chapel Hill, NC
Abstract #25
April 13, 2016
Sergio A. Guerra, Ph.D. – CPP Inc.
Ron Petersen, Ph.D., CCM – CPP Inc.
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Outline
• Background
• Classic EBD Method
– Wind Tunnel-Derived EBD
• Experimental Method
– AERMOD-Derived EBD
• Evaluation of WT and AERMOD Derived EBD
• Conclusions
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Building Downwash
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Building Profile Input Program
(BPIP)
Figure created in BREEZE ® Downwash Analyst
BREEZE is a registered Trademark of Trinity Consultants, Inc.
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PRIME
AERMOD’s Building Downwash Algorithm
• Used EPA wind tunnel data
base and past literature
• Developed analytical
equations for cavity height,
reattachment, streamline
angle, wind speed and
turbulence
• Developed for specific
building dimensions
• When buildings outside of
these dimensions, theory falls
apart
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BPIP Diagnostic Tool
http://bit.do/cppwind-BPIPDiagnosticLikely Overprediction Factor for each Flow Vector
Source 1
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ComplianceCompliance
CPP’s EBDCPP’s EBD
BPIP Diagnostic
ToolBuilding Geometry
Meteorological Data
Terrain Data
AERMET
AERMAP
Operating Parameters AERMODOther Inputs
Building
Inputs
BPIP Diagnostic Tool
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• Equivalent Building Dimensions (EBDs) are the dimensions (height, width, length and location) that are input into AERMOD in place of BPIP dimensions to more accurately predict building wake effects
• Guidance originally developed when ISC was the preferred model –
– EPA, 1994. Wind Tunnel Modeling Demonstration to Determine Equivalent Building Dimensions for the Cape Industries Facility, Wilmington, North Carolina. Joseph A. Tikvart Memorandum, dated July 25, 1994. U.S. Environmental Protection Agency, Research Triangle Park, NC
• Determined using wind tunnel modeling
What is EBD?
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Classic Approach
Wind Tunnel-Derived EBD
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Measure Ground-level
Concentrations
Data taken until good fit and max
obtained
Automated Max GL Concentration Mapper
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Measure Ground-level Concentrations
With Site Structures Present
Tracer
from stack
Max ground-level concentrations measured versus x
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Measure Ground-level Concentrations w/
Various EBD in Place of Site Structures
Tracer
from stack
Max ground-level concentrations measured versus x
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Selecting and Equivalent Building
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Summary of Approved Projects• Studies conducted and approved using original guidance for ISC
applications– Amoco Whiting Refinery, Region 5, 1990
– Public Service Electric & Gas, Region 2, 1993
– Cape Industries, Region 4, 1993
– Cambridge Electric Plant, Region 1, 1993
– District Energy, Region 5, 1993
– Hoechst Celanese Celco Plant, Region 3, 1994
– Pleasants Power, Region 3, 2002
• Studies conducted using original guidance for AERMOD/PRIME
applications – Hawaiian Electric (Approved), Region 9, 1998
– Mirant Power Station (Approved), Region 3, 2006
– Cheswick Power Plant (Approved), Region 3, 2006
– Radback Energy (Protocol Approved), Region IX, 2010
• After 2011 EPA Clearinghouse Memo
– Chevron 1 (Study Approved), Region 4, 2012
– Chevron 2 (Study Approved), Region 4, 2013
– Confidential Project (In process), Region 4, 2015
– Confidential Project, Region 10, 2016
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Experimental Method
AERMOD-Derived EBD Approach
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AERMOD-Derived EBD• Step 1: Wind Tunnel Study to Establish
Maximum Ground-Level Profile Mapping with
the No Site Structures Present Case
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AERMOD-Derived EBD• Step 2: Adjust AERMOD Inputs for the No Site
Structures Present Case
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AERMOD-Derived EBD• Step 3: Wind Tunnel Study to Establish Max.
Ground-Level Profile Mapping with Site
Structures Present
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AERMOD-Derived EBD• Step 4: AERMOD-Derived EBD
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Comparison between
Wind Tunnel and AERMOD-Derived
EBDs
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Comparison of WT-derived and
AERMOD-derived EBD profiles
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Conclusion
• Adjustments to key parameters in the *.sfc
and *.pfl meteorological files can be used to
get better agreement between WT and
AERMOD MGL concentrations for the no site
structures present case
• After these adjustments the AERMOD-EBD do
not match the Wind Tunnel-EBD
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Conclusion
• Discrepancy suggests that AERMOD is not
suitable to evaluate EBDs derived from WT
observations
• Wind Tunnel-derived EBD are still the
preferred method to replace BPIP-generated
ones
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Ron Petersen, PhD, CCM Sergio A. Guerra, PhD
[email protected] [email protected]
Mobile: +1 970 690 1344 Mobile: + 612 584 9595
CPP, Inc.
2400 Midpoint Drive, Suite 190
Fort Collins, CO 80525
+ 970 221 3371
www.cppwind.com @CPPWindExperts
Thanks!