Heat Transfer and Energy Exchange (1st Day)

Spring 2015

Professor Mason

February 24th

Fahrenheit/Celsius/Kelvin
In this class, we discussed heat transfer and energy exchange. First, we discussed about temperature (in Celsius, Kelvin, and Fahrenheit). There are certain formulas for each one of those.

After that, we calculated x, which was the number converted from Fahrenheit to Celsius (based on the picture above). Based on the numbers we all got in class, we calculated the uncertainty of those numbers, and from what we have gotten, the difference was not too high.

Heat Energy
Next, we discussed about heat (Q) which led us to a formula: Q = mc(delta T). This formula we used was applied to water, and it involved the temperature of water (T), mass of water (m), and the specific heat (c). Here are the examples that we did in class:

Heat Flow and Heat Rate

We also discussed heat rate (dQ/dt) which made us think about a formula: dQ/dt = [kA (delta T)]/L. This formula involves conductivity (k), surface area (A), temperature difference (delta T), and length (L). We applied this formula to copper and aluminum bar example. First, we had to find the Q based on: 

 The picture above is heat flow. Heat flow is the heat going through a material per second (J/s OR Watt). We used heat flow formula in order to move on to the next problem, which was:

Graph

The next thing we did was the graphs. Below are the pictures of the graphs that we took in class, including equilibrium temperature and heat versus temperature: