Register to reply

Heat transfer equation - formulation

by rammer
Tags: equation, formulation, heat, transfer
Share this thread:
Mar19-12, 11:06 AM
P: 23
Hi, I have a device which is heated from inside by constant heat (let's say by Joule's heat - UIt). Some heat causes temperature rise of the device, some is lost into surroundings through device's surface. I measured how temperature of the device varies with time and I want to calculate constants like heat capacity of the device and heat loss coefficient.

But I'm not sure whether my equation is correct:

dQ = CdT1 + γ(dT2)dt

C - heat capacity of the device
γ - heat loss coefficient
dt - time differential
dT1 - temperature differential (of the device per dt)

I'm confused about last expression in the equation: What does dT in the expression γ(dT2)dt mean? Is it the same as dT1 or is it rather instantaneous temperature of the device minus temperature of surroundings?
Phys.Org News Partner Physics news on
Optimum inertial self-propulsion design for snowman-like nanorobot
The Quantum Cheshire Cat: Can neutrons be located at a different place than their own spin?
A transistor-like amplifier for single photons
Mar21-12, 03:01 PM
P: 23
Anyone? I just need in what form/terms we express heat loss...

Register to reply

Related Discussions
SI units for Heat transfer equation Introductory Physics Homework 5
Heat transfer equation within soils General Physics 2
Heat Transfer Equation Introductory Physics Homework 2
Heat transfer equation Engineering, Comp Sci, & Technology Homework 0