![]() G'day,VinishYeah!!!! What he said.I knew rned it a way long time ago in thermal dynamics class. ![]() Which direction dominates depends on many variables such as amount of exposed skin, amount of sweat, relative humidity, and more. Here’s some math for you to do if that’s your thing: Wind chill 35.74 + (0.6215 × T) (35.75 × Wind sfc 0.16 ) + (0.4275 × T × Wind sfc 0.16 ) Wind sfc equals the wind speed and T, the temperature. Hence, wind is a double-edged sword in hot weather. The National Weather Service uses a rigorous scientific formula to arrive at this conclusion. It's after that determined based on the equation listed below. On a hot day - over 95 F - the wind is heating your body but at the same time, your sweat is being evaporated which cools your body and wind speeds up this evaporation which increases the rate of evaporative cooling. As an example, according to the North American Index, wind chill factors in the wind speed (V) along with ambient temperature level (T), as opposed to your riding speed. This is the cooling of the body by the evaporation of sweat. There is another phenomenon occurring which is much more prevalent at higher air temperatures. The above analysis ONLY takes into account radiative, convective, and conductive heat transfer which are all that are considered in the concept of wind chill. Above skin temperature, the wind is heating us. This is shown as a "wind chill" which is the temperature at which the same amount of heat would be transferred in the absence of any wind. That is, it removes heat from our body surfaces faster or more efficiently. It’s then calculated as per the equation below. Higher wind speed makes the air cool us faster. For instance, according to the North American Index, wind chill factors in the wind speed (V) along with ambient temperature (T), as opposed to your riding speed. When the air is below skin temperature (around 95 F), the air is cooling us. ![]() Wind merely increses the rate of heat transfer by reducing the thickness and effectiveness of the stagnant air layer next to the surface being heated or cooled. I perform heat transfer calculations for my job on an almost daily basis. ![]()
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