Technical Assessment of Dry Ice Limits on Aircraft (2013) / Chapter Skim
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Pages 35-42
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From page 35... ...
35 Results of Previous Studies Reviewing the studies mentioned previously: • The observed carbon dioxide concentration in the passenger cabin varied over a 700- to 2,000-ppm range but was typically about 1,200 to 1,500 ppm. • There was not always sufficient information on passenger loading to estimate carbon dioxide production from human metabolism.
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From page 36... ...
36 range of 0 to 2,000 ppm of carbon dioxide, and the second had a 5-cm path length and a range of 0 to 5,000 ppm carbon dioxide. An SKC "Grab Air" sample pump was used to draw a sample of cabin air through the Li-Cor at a nominal rate of 1 liter per minute.
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From page 37... ...
37 considerable amount of food must be stowed, and dry ice is used to provide additional cooling.§ As the right photo in Figure 12 shows, the food in some of these carts is covered with slabs of dry ice. Results of Measurements The data collected on the outbound flight are shown in Figure 13; Figure 14 and Figure 15*
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From page 38... ...
Figure 13. Cabin carbon dioxide concentration on outbound flight.
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Figure 14. Cabin carbon dioxide concentration on return flight, location 1.
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Figure 15. Cabin carbon dioxide concentration on return flight, location 2.
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From page 41... ...
41 The overall levels of carbon dioxide were somewhat higher on the outbound flight, particularly near the beginning of the flight. While the difference in the steady-state concentration between the outbound and return flight might not be statistically significant, the 50 ppm difference in steady-state values, as well as the higher levels observed at the beginning of the outbound flight, could be attributed to (a)
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From page 42... ...
42 Carbon Dioxide from Dry Ice Used for Food and Beverage Cooling Some airlines use dry ice for keeping food and beverages cold that will be served on board. The amount of carbon dioxide from this source varies widely and is dependent on the type of meal service provided, the length of the flight, and the way that the dry ice is used.
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