Endurance Innovation

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. 

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Endurance InnovationBy Andrew Buckrell and Michael Liberzon

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