Transport 2 Project

Transport 2 Project
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Storyboard Description

Conduction

Storyboard Text

  • What a beautiful day in the wonderful city of Philadelphia
  • Now that I finished my morning pop its time to do my daily wall touches
  • Hey Charlie... Could you stop hugging the walls again 
  • Hey Dennis man, I'm really scared man. I think my hands are different temperatures 
  • Stop hugging the walls you are scaring all of the customers 
  • Charlie, your hands are not different temperatures
  • What customers? We couldn't get people in here if we paid them 
  • SHUT UP D! Dumb bird
  • When I touch the walls my hands feel different temperatures, but when I hold them to my face they feel the same...
  • Hmmm, maybe I'm dying guys, I'm really scared. 
  • You aren't dying you, idiot! You are feeling the effects of heat transfer at work
  • Of course, not drugs are bad and this is a college learning tool ;) 
  • Heat Transfer... Frank are you on drugs again??
  • I'm telling you, Charlie, this is heat transfer at work. My friend Lucas gave a lecture about it during Transport II
  • Well alright, if this heat transfer thing is real what is it? And will it kill me? 
  • Let's see if I remember correctly, heat transfer is the movement of thermal energy from one thing to another
  • No Charlie, shut up and listen!
  • Oh, so heat transfer is some sort of superpower. I want it!
  • Heat transfer is caused by a temperature gradient and works to reach equilibrium 
  • Where'd you get the chalkboard from, Frank? 
  • I found it in the dumpster around back, what a steal right? Now stop interrupting and pay attention! There are three modes of heat transfer 
  • Hmm.  I think im just going to go kill some rats. This seems too complicated
  • Conduction 
  • Stay or I'll fire you
  • Which is the random molecular motion of adjacent particles Can be found using-                                     
  • Convection 
  • Which is the bulk motion of a fluid or particles  Can be found using-                                     
  • Radiation
  • Heat Transfer by electromagnetic waves or particles Can be found using-                                     
  • So what you are feeling is the combination of conduction and convection through the walls.  
  • Wait so you are telling me that the walls are broken? 
  • Let's punch it see if that fixes it 
  • No Charlie, look at the wall. It is being heated on one side by the warm summer air 
  • The wall is made up of 3 components; paint, sheet rock, and wood. 
  • Each component of the wall has a different K value for conduction. K is the thermal conductivity coefficient
  • Which material do you think would conduct heat better; steel or wood? 
  • Wood right? My rat club is made of wood and those rats sure feel the heat
  • Thats wrong Charlie
  • The Thermal Conductivity coefficient (K)- is a measure of a materials ability to conduct heat. Metals generally conduct heat better than many other materials
  • Wood
  • Steel
  • Similarly, each of the fluids that interact with the wall has a heat transfer coefficient, h
  • The summer air is being pushed to the wall and will transfer more heat to the wall than its cold counterpart on the other side
  • You lost me, Frank, what does any of this mean and why is it important? 
  • Turbulent
  • The Heat Transfer Coefficient (h)- is a characteristic of convective heat transfer between a fluid medium and the surface flowed over by the fluid.  h for turbulent air flow is greater than h for laminar flow due to higher fluid mixing
  • Laminar
  • From Professor Landherr's lecture we can talk about a few equations
  • Frank, i stopped doing math when I failed the 5th grade for the third time. Sorry but no thank you sir
  • Here is the important part though, Charlie. In order to do a lot of these calculations, we need to make assumptions.
  • I'm great at assuming Frank! 
  • The Energy Equation 
  • Now let's simplify
  • The Energy Equation Cont. 
  • CHARLIE! Wake up! I am almost done
  • ZZZZZ....ZZZZZ
  • This means that the flux is the same between all parts of the wall! This makes the math so much easier 
  • Watch this Charlie
  • One final assumption that we need to make is that the system is continuous. This means that there is no contact resistance.  - The walls are perfectly aligned 
  • Now let's go back to your problem with the wall
  • Let's find the conduction components for the wall
  • Wait Wait, I'm lost frank! Why is this part conduction?
  • Its conduction because we have direct contact between the different layers of the wall. This is also why we are using k.
  • Now let's look at the convective part for this problem
  • Before you ask why this is convection it is because the bulk warm air is coming into contact and flowing over the cooler wall
  • I understood that part, Frank. Please treat me with respect 
  • Here's the bread and butter Charlie. We can combine all the equations! !
  • I really could go for some bread and butter right about now 
  • This can be reduced using the overall Heat Transfer Coefficient, U. 
  • Wait, Frank, I think I get it!  = U
  • No Charlie! 
  • Oh darn so close 
  • Just a few finishing touches Charlie. Let's talk about resistance!
  • No Charlie, shut up and listen!
  • I'm having a hard time resisting sleep right now. Does that count? 
  • Thermal Resistance is the ability of an object to resist heat flow. Here are the equations for both types of heat transfer
  • Do you understand now why your hands feel different temperatures and that you aren't dying? 
  • Well not really, I just know I have to clean the bathrooms during my lunch break now. Thanks, Frank.  
  • Well before you do that lets summarize
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