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Consider a person who is trying to keep cool on a hot summer day by turning...

Consider a person who is trying to keep cool on a hot summer day by turning a fan on and exposing his entire body to air flow. The air temperature is 40°C and the fan is blowing air at a velocity of 2 m/s. If the person is doing light work and generating sensible heat at a rate of 300 kJ/h, determine the average temperature of the outer surface (skin or clothing) of the person. The average human body can be treated as a 30-cm-diameter cylinder with an exposed surface area of 1.8 m2 . Disregard any heat transfer by radiation. What would your answer be if the air velocity were doubled? Evaluate the air properties at 40°C.

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Engineering   Mechanical-Engineering   
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