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ME405_Lecture_11

ME405_Lecture_11 - ME 405 Fall 2006 Professor John M...

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ME 405 Fall 2006 Professor John M. Cimbala Lecture 11 09/29/2006 Today, we will : Continue our discussion of Thermal Comfort and Heat Stress in Section 3.5 Do some example problems Discuss Odors in Section 3.6 Finish the rest of Chapter 3 Do C a n d y Q u e s t i o n s f o r C a n d y F r i d a y Continuation from last time – Thermodynamics of the human body: First law of thermo becomes 0 MQ += ± ± , where M ± is the body’s metabolic rate, which includes any work (exercise or activity) being done by the body, and Q ± is the net rate of heat transfer to the body. Note: Since M ± is always positive, Q ± must always be negative. Various ways to gain or lose heat from the body: Conduction cond Q ± : can be + or -, but usually is negligible Convection conv Q ± : can be + or -, but usually negative unless outside air > 98.6 o F Radiation rad Q ± : can be + or -, depending on temperature of walls, etc. Respiration cond Q ± : can be + or -, but usually negative unless outside air > 98.6 o F Conduction cond Q ± : always negative (can’t gain heat by sweating)
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Table 3.8
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ME405_Lecture_11 - ME 405 Fall 2006 Professor John M...

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