www.cppwind.com www.cppwind.com Evaluating AERMOD and Wind Tunnel Derived Equivalent Building Dimensions Guideline 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.
24
Embed
Evaluation of AERMOD and Wind Tunnel Derived Equivalent Building Dimensions
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Transcript
www.cppwind.comwww.cppwind.com
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.
www.cppwind.comwww.cppwind.com
Outline
• Background
• Classic EBD Method
– Wind Tunnel-Derived EBD
• Experimental Method
– AERMOD-Derived EBD
• Evaluation of WT and AERMOD Derived EBD
• Conclusions
www.cppwind.comwww.cppwind.com
Building Downwash
www.cppwind.comwww.cppwind.com
Building Profile Input Program
(BPIP)
Figure created in BREEZE ® Downwash Analyst
BREEZE is a registered Trademark of Trinity Consultants, Inc.
www.cppwind.comwww.cppwind.com
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
www.cppwind.comwww.cppwind.com
BPIP Diagnostic Tool
http://bit.do/cppwind-BPIPDiagnosticLikely Overprediction Factor for each Flow Vector
Source 1
www.cppwind.comwww.cppwind.com
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
www.cppwind.comwww.cppwind.com
• 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?
www.cppwind.comwww.cppwind.com
Classic Approach
Wind Tunnel-Derived EBD
www.cppwind.comwww.cppwind.com
Measure Ground-level
Concentrations
Data taken until good fit and max
obtained
Automated Max GL Concentration Mapper
www.cppwind.comwww.cppwind.com
Measure Ground-level Concentrations
With Site Structures Present
Tracer
from stack
Max ground-level concentrations measured versus x
www.cppwind.comwww.cppwind.com
Measure Ground-level Concentrations w/
Various EBD in Place of Site Structures
Tracer
from stack
Max ground-level concentrations measured versus x
www.cppwind.comwww.cppwind.com
Selecting and Equivalent Building
www.cppwind.comwww.cppwind.com
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
www.cppwind.comwww.cppwind.com
Experimental Method
AERMOD-Derived EBD Approach
www.cppwind.comwww.cppwind.com
AERMOD-Derived EBD• Step 1: Wind Tunnel Study to Establish
Maximum Ground-Level Profile Mapping with
the No Site Structures Present Case
www.cppwind.comwww.cppwind.com
AERMOD-Derived EBD• Step 2: Adjust AERMOD Inputs for the No Site
Structures Present Case
www.cppwind.comwww.cppwind.com
AERMOD-Derived EBD• Step 3: Wind Tunnel Study to Establish Max.