# CHBE7 - Various upcoming AICHE events Guest speaker from...

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Various upcoming AICHE events • Guest speaker from ?? (sometime later in April) • Buddy event: Paintball !! April 4 at 12:30 PM Contact Lara: lniersb2@illinois.edu 1 Today: 3 of you still need to declare project ~5 of you owe me a research project abstract 4 of you still owe me HW4

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Example Lecture: Heat Transfer (ChBE 421) Paul J.A. Kenis, Ph.D. University of Illinois at Urbana-Champaign Many thanks to: Dr. Marina Miletic and Dr. Dan Pack who provided material for these slides 2
How is Heat Transferred? 1. Conduction 2. Convection 3. Radiation Heat transfer (cooling or heating) through a moving fluid (gas or liquid) at different temperature Heat transfer by direct contact of particles of matter; A solid (or liquid) in contact with another solid (or liquid) of different temperature Examples: Coffee heating up a coffee cup Grabbing a cold/hot object with your hand Example: hot water increasing the temp. of a heater in a room Example: Earth receiving radiation from the sun Heat transfer as a result of electro-magnetic waves being exchanged between surfaces

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Fourier’s law of conductive heat transfer (for example to calculate heat transferred through a window) Conduction Heat Transfer q = -k A ( dT/dx ) heat flux (thermal energy transferred) Thermal conductivity (material property) Air: low Metal: high Plastic: intermediate Area across which heat is being transferred Temperature change over a certain distance (typically thickness of material)
Conduction Heat Transfer Example q = -k A ( dT/dx

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## This note was uploaded on 05/05/2010 for the course CHBE 121 taught by Professor Paulkenis during the Spring '10 term at University of Illinois at Urbana–Champaign.

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CHBE7 - Various upcoming AICHE events Guest speaker from...

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