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Evaporative resistance of newly designed bicycle helmets

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As a continuation of the work on the ventilation requirements for a bicycle helmet for commuters, 15 full scale helmet mock-ups were created and tested for dry heat loss properties in a wind tunnel on a thermal head manikin... The helmets were tested in the wind tunnel placed in a climatic chamber at 34 °C and 40 % relative humidity (water vapour pressure in the air 2200 Pa) with the air velocities set to 1.6 m/s (≈6 km/h)... In addition, 4 commercially available helmets were tested as reference... The best reference helmet from the earlier study stayed approximately in the middle of the tested range while the poorest reference helmet was in the end of the line with an often used one as the worst (Figure 1)... Thus, the newer solutions performed much better from an evaporation viewpoint than commercially available helmets... However, the order of the helmets in the "best function line" for evaporation was different from their insulation performance, as reported previously... The best helmet from the evaporation viewpoint was different from the best in terms of insulation... This means that a best solution for a commuter has to be defined by the user's bicycling activity, the weather conditions etc... The newly designed helmets' results can be used as the basis for improvement of helmet ventilation.

No MeSH data available.


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Evaporative resistance of design helmets at 1.6 m.s-1 wind and 34 °C with a wet textile skin
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Figure 1: Evaporative resistance of design helmets at 1.6 m.s-1 wind and 34 °C with a wet textile skin

Mentions: The prototypes differed largely in evaporative resistance (Figure 1).


Evaporative resistance of newly designed bicycle helmets
Evaporative resistance of design helmets at 1.6 m.s-1 wind and 34 °C with a wet textile skin
© Copyright Policy - open-access
Related In: Results  -  Collection

License 1 - License 2
Show All Figures
getmorefigures.php?uid=PMC4580820&req=5

Figure 1: Evaporative resistance of design helmets at 1.6 m.s-1 wind and 34 °C with a wet textile skin
Mentions: The prototypes differed largely in evaporative resistance (Figure 1).

View Article: PubMed Central - HTML

AUTOMATICALLY GENERATED EXCERPT
Please rate it.

As a continuation of the work on the ventilation requirements for a bicycle helmet for commuters, 15 full scale helmet mock-ups were created and tested for dry heat loss properties in a wind tunnel on a thermal head manikin... The helmets were tested in the wind tunnel placed in a climatic chamber at 34 °C and 40 % relative humidity (water vapour pressure in the air 2200 Pa) with the air velocities set to 1.6 m/s (≈6 km/h)... In addition, 4 commercially available helmets were tested as reference... The best reference helmet from the earlier study stayed approximately in the middle of the tested range while the poorest reference helmet was in the end of the line with an often used one as the worst (Figure 1)... Thus, the newer solutions performed much better from an evaporation viewpoint than commercially available helmets... However, the order of the helmets in the "best function line" for evaporation was different from their insulation performance, as reported previously... The best helmet from the evaporation viewpoint was different from the best in terms of insulation... This means that a best solution for a commuter has to be defined by the user's bicycling activity, the weather conditions etc... The newly designed helmets' results can be used as the basis for improvement of helmet ventilation.

No MeSH data available.


Related in: MedlinePlus