The Airliner Cabin Environment Air Quality and Safety (1986) / Chapter Skim
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Appendix A: A Computer Model for Assessing Airliner Cabin Air Quality
Appendix A: A Computer Model for Assessing Airliner Cabin Air Quality
Pages 225-243
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From page 225... ...
A model of cabin air quality could serve adequately as an investigative tool. An accurate, validated model could be used to pinpoint potential problems and to study the sensitivity of pollutant concentrations to various control measures.
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From page 226... ...
Information on air recirculation and filtering is also available, as is information on the source strengths of some of the pollutants, such as carbon dioxide and water vapor from humans, tobacco smoke, and ozone. Less is known about others, such as volatile organic compounds emitted from materials, insecticides, or cleaning agents.
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From page 227... ...
Rj - 1 bj Lj hi/ l Vi, Sit, Kj FIGURE A-1 Schematic of single component of multibox model of aircraft cabin air quality. text for explanation of symbols.
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From page 228... ...
Note that the cabin can be considered to be a single compartment (box 0) , with polluted air leaving the cabin (F)
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! ~ F FIGURE A-3 Schematic of coupled components for multibox model of aircraft cabin air quality.
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From page 230... ...
This system has a tridiagonal form and can be solved efficiently with LU factorization. The coupled cabin and air cleaning system is solved first, with an explicit solution of the two-by-two form.
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From page 231... ...
These are appropriate for an L-1011 with four compartments and tobacco smoke as the pollutant of interest. TABLE A-1 Parameters for Whole Aircraft with L-1011 Four-Zone Parameterization Parameter Volume Recirculation Leak rate Net flow rate Deposition Source rate Exhaust flow Makeup flow Outdoor concentration Number of boxes Value 450.0 m3 150.0 m3/min 10.0 m3/min 140.0 m3/min 0.0033/min 83.3300 mg/min 140.0 m3/min 150.0 m3/min 0.01000 mg/m3 SIMULATING AIRLINER AIR QUALITY The Cabinair model was used to simulate the steadystate concentrations of environmental tobacco smoke, carbon dioxide, and water vapor in multiple zones of three aircraft: B-727-200, B-767-20O9 and MD-80.
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From page 232... ...
The 2,388 cfm from the ECUs is mixed with 2,388 cfm of filtered recirculation air from the forward cabin and delivered to the cockpit and to the overhead air vents in the cabin. The overboard discharge manifold draws air from lavatories, galleys, and the aft avionics compartments, which then mixes with floor-level cabin exhaust and is discharged overboard.
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From page 233... ...
233 ~ , tic AX ~ bc o E t)
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From page 234... ...
234 a, = E c o to it.
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From page 235... ...
I 1 1~30 Service Bar ~: Lavat ~ Zone Rows Seats Crew Flight Deck First Class Lavatory and Galley First Class Non-Smoking First Class Smoking Coach Non Smoking Coach Transition Coach Smoking Coach Lavatory and Galley 13 8 1 4 4 519 81 2 20 21 12 22-30 41 1 FIGURE A-7 Standard B-727-200 interior arrangement. Numbers of rows allotted for smoking can be increased or reduced according to demand for nonsmoking seats.
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From page 236... ...
, I ,, ...._ m ~ m ~ Em, m m , , , m m m m m Ill Em, m m m m m LL] m 18-t 19 - ~1 20- m t111 m 21- m ~ m 22- m cm m m m: m 27 - m 1 1 1 1 m 23- m mm m 33_ m mm m 335- m An, m Lavatory- Em,, [E Closet Movie Screen - 1 _ Movie Screen ~ 6 - 7 -8 _ 9 -10 -11 ~12 1 4^ Closet Lavatory Movie Screen - 18 -19 -20 -21 -22 -23 -24 -25 As_ -26 -27 -28 -29 -30 -3 1 -32 -33 -34 _35 -36 Lavatory Galley 37' Galley ~ Galley \~L Galley Zone Rows Seats Crew Flight Deck First Class Lavatory and Galley First Class Non-Smoking First Class Smoking Business Non-Smoking Business Smoking Business Lavatory and Galley Coach Non-Smoking Coach Transition Coach Smoking Coach Lavatory and Galley 1-2 12 3 6 6-10 30 ~ 1-14 16 18-27 28-29 30-37 67 18 48 l 1 1 FIGURE A-8 Standard B-767-200 interior arrangement.
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From page 237... ...
Changing these values (by filtration) will alter the results only slightly for respirable particles, but might have larger effects for carbon dioxide and water vapor.
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From page 238... ...
, TO Cockpit 0.0100.010 517 7.8 First-class lavatory and galley 0.0100.010 435 5.5 First-class nonsmoking 0.0100.010 919 8.7 First-class smoking 1.3023.886 1,178 10.8 Coach nonsmoking 0.0580.154 1,284 10.9 Coach transition 0.0180.034 1,373 11.6 Coach smoking 2.2436.708 1,367 11.6 Coach lavatory and galley 0.2990.876 484 4.4 Whole aircraftd 0.5601.661 1,139 10.1 Volume averagede 0.5701.691 1,154 10.1 Supply air 0.0100.010 330 3.7 e a Zones are examples of standard configuration zones; 100% occupancy assumed; no recirculation. Supply air concentration is ambient concentration.
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From page 239... ...
d Average concentration derived from arithmetic average of tonal concentrations. e Derived from zonal concentrations weighted by volume .
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From page 240... ...
CO2 and water vapor concentrations assume temperature of 20°C. b One-third of cigarette smokers smoking at any time (2 cigarettes/in)
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From page 241... ...
CO2 and water vapor concentrations assume temperature of 20°C. b One-third of cigarette smokers smoking at any time (2 cigarettes/in)
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From page 242... ...
CO2 and water vapor concentrations assume temperature of 20°C. b One-third of cigarette smokers smoking at any time (2 cigarettes/in)
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From page 243... ...
ASHRAE Standard: Ventilation for Acceptable Air Quality.
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