http://nkhome.com/news/2010/07/when-the-heat-index-is-lower-than-the-actual-temperature/ Kestrel Pocket Weather Meters and NK Electronics for Rowing Mon, 30 Jan 2012 02:45:33 +0000 hourly 1 http://wordpress.org/?v=3.2.1 http://nkhome.com/news/2010/07/when-the-heat-index-is-lower-than-the-actual-temperature/comment-page-1/#comment-2708 Todd Tue, 07 Jun 2011 16:39:09 +0000 http://nkhome.com/wp/?p=369#comment-2708 I find this an interesting formula/calculation but was curious about a few of the variables (some of which appear to be constant values) in the formula. I am an avid bicyclist and commute on a regular basis to work via bike. As such, I often wear engineered garments designed to wick miosture away from skin, which may impact the values for "Skin resistance to moisture transfer" and “Clothing resistance to heat transfer”. In addition I typically wear cycling shorts so more of the thigh is exposed than would be with the “long trousers" defined in the “Clothing cover” Variable/Constant so the value used here should be different, which in turn should result in a different Kestrel table value. Another potentially large variation on this index for cyclists is “Effective wind speed”. For example, Riding North at 16 mph with a 20 mph tail wind (directly from the south) results in net wind speed of 4 mph. However, the impact would be much greater riding north at 13 mph into a headwind (directly from the north) at 14 mph. This scenario would result in net wind speed of 27 mph. How would a 27 mph wind speed change the kestral index versus the assumed 3 mph constant? Perhaps this index could be modifed to account for outdoor enthusiasts (especially bicyclists) whose garments are engineered with specific materials for moisture wicking, accross a range of wind speeds, and with consideration to higher “Activity” levels and “Ventilation” rates in addition to different values for the “Skin resistance to moisture transfer” and “Clothing resistance to heat transfer” constants and maybge even calculated across mutliple “Basic Dimensions” from small to medium to large body sizes? Hmmm. Basically curious to know what the kestral heat index would be for a bicyclist with a mass of 270 lbs riding 13 mph on a 95 degree day against a 12 mph headwind while wearing cycling shorts and short sleved shirt made engineered from poly/nylon (and other) blended materials? Thanks for listening and perhaps I can chart this myself but am too lazy so I thought I would ask. Thanks again. Sincerely, Todd. I find this an interesting formula/calculation but was curious about a few of the variables (some of which appear to be constant values) in the formula. I am an avid bicyclist and commute on a regular basis to work via bike. As such, I often wear engineered garments designed to wick miosture away from skin, which may impact the values for “Skin resistance to moisture transfer” and “Clothing resistance to heat transfer”. In addition I typically wear cycling shorts so more of the thigh is exposed than would be with the “long trousers” defined in the “Clothing cover” Variable/Constant so the value used here should be different, which in turn should result in a different Kestrel table value. Another potentially large variation on this index for cyclists is “Effective wind speed”. For example, Riding North at 16 mph with a 20 mph tail wind (directly from the south) results in net wind speed of 4 mph. However, the impact would be much greater riding north at 13 mph into a headwind (directly from the north) at 14 mph. This scenario would result in net wind speed of 27 mph. How would a 27 mph wind speed change the kestral index versus the assumed 3 mph constant? Perhaps this index could be modifed to account for outdoor enthusiasts (especially bicyclists) whose garments are engineered with specific materials for moisture wicking, accross a range of wind speeds, and with consideration to higher “Activity” levels and “Ventilation” rates in addition to different values for the “Skin resistance to moisture transfer” and “Clothing resistance to heat transfer” constants and maybge even calculated across mutliple “Basic Dimensions” from small to medium to large body sizes? Hmmm. Basically curious to know what the kestral heat index would be for a bicyclist with a mass of 270 lbs riding 13 mph on a 95 degree day against a 12 mph headwind while wearing cycling shorts and short sleved shirt made engineered from poly/nylon (and other) blended materials? Thanks for listening and perhaps I can chart this myself but am too lazy so I thought I would ask. Thanks again. Sincerely, Todd.

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