Lecture_4.2__Heat_Transfer

# Lecture_4.2__Heat_Transfer - AE202 Lecture 1.9 Heat...

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AE202 Name______________________ Lecture 1.9 Heat Transfer Date_______________________ Reading: MEEB 10 th Edition o Chapter 7 o Appendix E Heat Transfer Unit of Measurement - Rate of heat transfer 1. English _________ 2. SI (Watts) Convention o Direction of heat flow Objective o ________________heat transfer by increasing resistance Assumptions 1. 2. Definitions Conductivity (k) Amount of heat (BTU/hr) that flows through: in an hour, one square foot of material, one inch thickness, subjected to one degree temperature difference. Conductance (c) Amount of heat flow for a given thickness of material Resistance (R) Reciprocal of conductance [R=1/c] Resistance per inch (R) Reciprocal of conductivity [R=1/k] R value increases with thickness

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Units Conductivity (k) ________________________ Conductance (c) ________________________ Resistance (R=1/c) ________________________ Resistance per inch (R=1/k) ________________________ Assembly Increase ________________ Decrease _______________ Temperature at the center =
Assembly - Coefficient of transmission ( U-value ) 0. Number of BTUs flowing through an assembly per 1 ____________ 1 ____________ Assembly - Example R 1 =2 R 2 =3 Air Air film - Surface resistance of air

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