# Heat Transfer

**Taught by: Dr. Matt Maschmann**

**Taken: FS 2014**

**Text: Introduction to Heat Transfer (Sixth Edition)** *by: Bergman, Lavine, Incropera, Dewitt*

## Exam 1 Formula Sheet

## Energy Balance

- Time rate of energy entering the system

- Time rate of energy leaving the system

- Time rate of energy generated in the system

- Time rate of change of energy stored in the system

## Fourier's Law (Conduction)

- Heat rate in the x direction

k - Thermal conductivity

A - Cross sectional area perpendicular to the heat flow

- Temperature gradient in the x direction

## Newton's Law of Cooling (Convection)

- Heat rate in the x direction

h - Heat transfer coefficient

A - Cross sectional area perpendicular to the heat flow

T - Temperature of the solid surface

- Temperature of the bulk air

## Stephan-Boltzman Law (Radiation)

- Heat rate in the x direction

- Emissivity

- Stephan-Boltzman constant

A - Cross sectional area perpendicular to the heat flow

T - Temperature of the solid surface

- Temperature of the surroundings

## Heat Diffusion Equation (Conduction)

## Thermal Resistances