Professor Mason
March, 12th
Thermal Electric Cooler
The first thing we did in class was an experiment about a thermoelectric cooler, which involves boiling water and ice water. This thing works just like rooftop solar panels, and it is dependent on the sun because heat is the source.
As shown on the picture above, one side of the cooler is dipped into boiling water and the other one is dipped into ice water. Therefore, we can conclude that temperature difference make the motor starts or make electricity (the circle plate starts spinning with a certain direction). Next, we flip the sides of the cooler, and what happened was the circle plate went into the opposite direction. The next thing we did was to take out the motor and plug in the power supply into the cooler.
This time, we did not put the cooler into any water, however, by plugging in the cooler into the power supply, it makes some temperature difference out of electricity. Therefore, we can conclude that power supply can turn electricity into temperature difference because it is acting as a heat pump.
Heat Capacity
In class, we learned about heat capacity; we started with molar heat capacity. Molar heat capacity is defined as heat per unit change of temperature [C = Q/delta T]. Molar heat capacity of the gas is defined by and equation [C molar = Q/ (n*delta T)], which n is defined as molar.
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We define isobaric process by an equation [Q = n*Cp*delta T], which Cp is a constant that equals to [5R/2]. We also define isochoric process by an equation [Q = n*Cv*delta T] (noble gas), which Cv is a constant equals to [3R/2]. We also had an adiabatic process, which the equation can be simplified as [(delta P/P) + ((Cp*deltaV)/(V*Cv)) = 0]. For adiabatic process, we can say that Q = 0, which leads to a simplified equation of
[(Ti*Vi^2/3) = (Tf*Vf^2/3)].
Carnot Engine
In class, we discussed about an engine other than heat engine, which is Carnot engine. We were supposed to do calculations based on Carnot engine by using equations [Qc = nRTc ln(Vi/Vf)] and [Qh = nRTh ln(Vi/Vf)]. We can simplify those equations into [(Qc/Qh) = (Tc/Th)]. By using those equations, we needed to find delta E internal, Q, and W by making table based on the ABCD diagram on the picture above.
Heat Engine Experiment
In class, we got to play with a sample of heat engine that professor Mason provided.
There are some steps in heat engine, and these are the following:
There are ways to increase Power output in an engine, and below are the following:
1. Increase cycle per second.
2. Larger volume of cylinder of the piston.
3. Increase maximum pressure.
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