Which one Blows Harder?

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3:30 Cycling Tips review of fans

Fan specs: volumetric flow rate, airflow velocity, power

Measured skin temp, core temp, heat flux

Used an array of Core body temp sensors 

Compared no fan, small desktop fan, low velocity air mover, wahoo headwind, scroll fan

Heat transfer equation: Q=k*A*ΔT, where Q is the heat transfer, k is  the heat transfer coefficient, A is the surface area, and ΔT is the difference between skin temperature and the air around the skin

Maximize all three variable to maximize heat transfer

Perception of thermal comfort vs core temperature

39:30 how much does a flappy run top cost in terms of run power?

Tight clothing improves wicking and cooling

Based on a CdA of 1.0, at 4:00/km, aero drag is 40W

Flappy kit may increase CdA by 20% or 8W

Michael’s 4:00/km Stryd power is 340W, plus 40W for air resistance

So floppy kit hit of 8W is an increase of ~2%

@ a 5:00/km pace, the aero drag is too small to worry about.

Check out our episodes on heat transfer: 112, 115, 32, and the Core Body Temp Sensor page for their webinars and blog posts.