Good morning, everyone.
Welcome to your Heat Transfer Experiment Number Two, Heat Transfer From Extended Surface.
We also call this Fin Performance.
In order to do this experiment, you need two devices.
Number one, that's the service unit.
We have used this before.
Number two, that's going to be the extended heat transfer module.
And this extended heat transfer module actually is a brass bar coated with insulating material
with total 8 thermocouples embedded to measure the temperature distribution.
And also on the base side-- this is the base side-- with an electrical heater.
And we also have one more thermocouple actually measures-- that's thermocouple 9-- measures
the room temperature.
Once there's a heat transfer from extended surface module connected to the service unit,
we will be able to measure the temperature distribution.
Now first, let's set up the equipment, connect this to the power cord.
This is a power cord for the service unit.
This is the power source for the electrical heater connected to the back side of the service
unit.
We also need to connect all, total nine thermocouples to the service unit.
Please check the label of the thermocouple.
This is thermocouple with a label, number 1.
Connect it to T1.
This is thermocouple number 2.
You need to connect this one to T2.
And do the same thing for all the other thermocouples.
So now the thermocouples, and also the module, and service unit all been connected.
You can start to do the experiment.
Let's start the experiment for the first part.
The service unit, actually, was already turned on.
For the first set of data, we need to set up the voltage to be about 9 volts.
Again, this is going to be the voltage set up for group number one.
Please refer to the manual to find out the voltage input for your group.
So now, I'm trying to set up the voltage to be 9 volts.
So this is the voltage input, 9 volts, for group number one.
And also, you will be able to get the current reading, which right now equal to 0.31 amp.
Now if you use the voltage multiplied by current, you're going to get a constant.
That constant is going to be the constant input for the electrical heater.
And that's also the constant heat transfer rate from the base through the extended surface
to the environment.
Then when the temperature becomes steady state, you will be able to collect the temperature
value.
How do we know the temperature right now becomes stable?
You need to monitor the temperature value of any thermocouple.
Let's say right now, we are looking at the temperature value of thermocouple number 1.
If you notice that this value, temperature value, does not change for about 90 seconds,
then you can start to record your temperature value of T1 all the way to T9, and also the
voltage and the current.
That's going to be your first set of data.
And then, we can change the voltage set up to be 14 volts.
Again, that's going to be the voltage input for group number one.
Please refer to the manual to find out the input of voltage for your group.
So now I'm trying to set up the voltage to be 14 volts.
So this is a voltage of 14 volts.
Again, you can also, just like before, get a current reading by turning the knob to the
I. And the voltage multiplied by current, again, that's going to equal to the constant
input to the electrical heater.
That's also the constant heat transfer rate from the base through the extended surface
to the environment.
You have to wait another 20 to 25 minutes to let the temperature become stable and collect
your second set of data, which includes total 9 temperature values, and also the current
and voltage.
This will complete your Heat Transfer Experiment Number Two.