Consider a person who is trying to keep his body cool in a hot summer day by turning a fan on and exposing his entire body to an air stream at 30°C. The fan is blowing air at a velocity of 2 m/s. If...

Consider a person who is trying to keep his body cool in a hot summer day by turning a fan on and exposing his entire body to an air stream at 30°C. The fan is blowing air at a velocity of 2 m/s. If the person is doing some light work and generating sensible heat at a rate of 100 W, calculate the average temperature of outer skin of the person. The average human body can be treated as a 30 cm diameter cylinder with an exposed surface area of 1.7 m². Neglect heat loss by radiation. Also calculate the heat dissipation rate from the body if air velocity is doubled.