Jacobs_CFD_Fermi_MI-65_VaporDispersionStudy_2021-12-07.pdf
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- Attached to
- A/E MI65 Stack Modifications Federal contract opportunity
- Solicitation number
- ISD-351745-SCM
About this file
This document includes a technical study analyzing vapor dispersion from stacks at the Fermi National Accelerator Laboratory facility and a related federal contract opportunity. The technical study models vapor dispersion under various ambient conditions from two stacks emitting process vapors at airflow rates of 10,000 cfm and 25,000 cfm. The study finds that at wind speeds below 2 mph, droplets could reach the MI-65 building under warm humid conditions from both stacks, but would deposit on the ground before reaching the MI-8 building at the lower airflow rate. At 11 mph winds, no droplets would reach either building. A separate federal contract opportunity from the Department of Energy seeks an engineering firm to provide final design documents for modifications to the MI-65 stack, including a ground-mounted exhaust system, control strategies, transformer design and placement, and a 15,000 gallon integrated condensate storage system with enclosure.
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| Att1 RFP Appendix Detailed Scope description 2024Jan17.pdf | ||
| Jacobs_Fermi_MI-65_ExhaustStackDesignReport_30pct_2021.11.15.pdf | ||
| AE MI65 Stack Modifications RFP.pdf | ||
| General Terms and Conditions for Services (05.2023).pdf | ||
| Jacobs_CFD_Fermi_MI65_VaporDispersionStudy_ExhaustSystemSubModel_2022.02.07_excerpt.pdf |
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Facility Modeling & Analytics Group07 December 2021
Fermi
MI-65 Stack Vapor Dispersion Study
Charles Wang, PhD, PE
469-999-8905 charles.wang2@jacobs.com
Fermi
Andrew Dunavent
619-272-7223 andrew.dunavent@jacobs.com
Keith Kibbee, PE
503-872-4573
Keith.Kibbee@jacobs.com
Facility Modeling & Analytics Group
Preliminary
FDZE7302 Fermi MI-65 Stack Dispersion Analysis 07 December 2021 2
Preliminary Study Cases
Wind Speed
Stack Exhaust Ambient
CFM DB (F) RH HR (lbw/lbda) Density
(lb/ft3) DB (F) RH Enthalpy
Pressure
(in.Hg)
HR
(lbw/lbda) Effective Altitude
< 2.0 mph
10236 73.7 92% 0.017 0.072
73 90% 35.2 29.21 0.016 665 ft 2 25236 73.3 91% 0.016 0.072
11.0 mph
10236 73.7 92% 0.017 0.072
4 25236 73.3 91% 0.016 0.072
5 10237 36.5 27% 0.001 0.079
-2 30% -0.3 29.65 0.000 250 ft
6 25237 35.6 14% 0.001 0.079
Annual Wind Rose.
W. Chicago/D.U. Page, Illinois
Stack N Stack N
Stack SW Stack SW
Stack SE Stack SE
Height
Above
Parapet (ft)
Precondi-tioning Airflow
(cfm)
Velocity
(fpm)
Stack N 10.0 10K 3,500
Stack E 10.0 10K 3,500
Stack W 10.0 10K 3,500
Height
Above
Parapet (ft)
Airflow
(cfm)
Velocity
(fpm)
Stack N 10.0 25K 3,500
Stack E 10.0 25K 3,500
Stack W 10.0 25K 3,500
For this preliminary analysis, two ambient conditions were considered (tabulated below) including cold dry (-2 F degree, 30%RH) and warm humid (73 F degree, 90%RH). Droplet accumulation was calculated for the south prevailing wind direction coincident with these two seasonal conditions, each at two different wind speeds (less than 2 mph and 11 mph). Two pre-conditioning flow rates are included in this preliminary study: 10,000 cfm and 25,000 cfm.
Each stack was modeled with the same discharge velocity (3,500 ft/min), discharge height at 10ft above parapet, and volume of entrained evaporator exhaust (375 cfm). Input parameters are tabulated below.
Precondi-tioning
FDZE7302 Fermi MI-65 Stack Dispersion Analysis 07 December 2021 3
Downwind Droplet
Diameter (μm)
South
Wind
1.5 mph
Downwind Droplet
Diameter (μm)
Case 1 Case 2
Wind Speed
Stack Exhaust Ambient
CFM DB (F) RH HR (lbw/lbda) DB (F) RH Pressure (in.Hg) HR (lbw/lbda)
< 2.0 mph
10236 73.7 92% 0.017 73 90% 29.21 0.016
2 25236 73.3 91% 0.016
South
Wind
1.5 mph
Preliminary Study Cases -1 & 2 (Calm + Warm Humid)
MI-65
TSIB
MI-8
MI-65
TSIB
MI-8
MI-65
MI-8
MI-65
MI-8
The key stack exhaust and ambient information are tabulated below.
• Droplets reach MI-65 with both stack designs with winds out of the South at 1.5 mph.
• Droplets deposit on the ground close to MI-65 at lower stack flow rate.
• Droplets are advected towards much further downwind locations and evaporated prior to reaching downwind building MI-8 at the higher stack flow rate.
Droplets will reach MI-
65 roof top.
Droplets will reach MI-
65 roof top.
Droplets will touch ground before reaching MI-8
FDZE7302 Fermi MI-65 Stack Dispersion Analysis 07 December 2021 4
Downwind Droplet
Diameter (μm)
South
Wind
11.0 mph
Case 3 Downwind Droplet
Diameter (μm) Case 4
Wind Speed
Stack Exhaust Ambient
CFM DB (F) RH HR (lbw/lbda) DB (F) RH Pressure (in.Hg) HR (lbw/lbda) Effective Altitude
11.0 mph
10236 73.7 92% 0.017 73 90% 29.21 0.016 665 ft
4 25236 73.3 91% 0.016
South
Wind
11.0 mph
Preliminary Study Cases -3 & 4 (Warm Humid)
The key stack exhaust and ambient information are tabulated below.
• Droplets remain aloft and do not reach MI-65 with both stack designs with winds out of the South at 11mph.
• Droplets evaporated prior to reaching downwind buildings at the higher stack flow rate.
• Some deposition at MI-8 was observed at the lower stack flow rate.
MI-65
TSIB
TSIB
MI-65
MI-8 MI-8
MI-65 MI-8MI-65 MI-8
Droplets do not reach
MI-65 roof top.
Droplets do not reach MI-65 roof top.Droplets deposit on MI-8 rooftop
FDZE7302 Fermi MI-65 Stack Dispersion Analysis 07 December 2021 5
Wind Speed
Stack Exhaust Ambient
CFM DB (F) RH HR (lbw/lbda) DB (F) RH Pressure (in.Hg) HR (lbw/lbda) Effective Altitude
11.0 mph
10237 36.5 27% 0.0012 -2 30% 29.65 0.0002 250 ft
6 25237 35.6 14% 0.0006
South
Wind
11.0 mph
South
Wind
11.0 mph
Case 5 Case 6Downwind Droplet
Diameter (μm)
Downwind Droplet
Diameter (μm)
Preliminary Study Cases -5 & 6 (Cold Dry)
MI-65
MI-8
MI-65
MI-8
MI-65
TSIB
MI-8
MI-65
TSIB
MI-8
The key stack exhaust and ambient information are tabulated below.
• Droplets evaporated quickly after emitting outside because of lower ambient humidity and enthalpy.
• No droplet deposition was detected on rooftop and ground for both cases.
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