Hey everyone,
I hope these notes help you out:
* A carnot cycle is the most efficient way heat can be converted to work. It is ideal and never actually occurs in real life because of friction and the loss of heat to the environment. The cycle is composed of two isothermal (no temp. change) and two adiabatic (no heat flow) reversible processes. These processes are either expansions (Won is negative) or compressions (Won is positive).
* A reversible process is one that can be reversed because it is ideal and none of the energy or heat involved is mistakenly lost forever due to friction and loss of heat to the environment. Reversible process never actually occur in real life.
* The efficiency of a carnot cycle is measured with the equation: efficiency = 1 - (Tlow/Thigh).
* Remember that all of the equations D-Rock wrote on the board should be used for engines. When you have a refrigerator problem, you should use these (I hope these are right):
- AB... Won = -qAB = nRTln(VA/VB)
- BC... Won = -qBC = Cv (Thigh - Tlow)
- CD... -Won = qDC = nRTln(VC/VD)
-DA... -Won = qDA = Cv (Tlow - Thigh)
* Work is always measured in terms of the work done on the system by the surroundings while heat is always measured in terms of heat gained by the system from the surroundings.
* Heat flows spontaneously from high to low temperature areas. If you want to make heat flow from low to high (like with a refrigerator), work needs to be done on the system.
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2 comments:
Hi Derek! I was on facebook and noticed that you wore a really sweet yellow jacket to your prom. could you please wear it to workshop next week? I would really appreciate it, I'm certain it would help enhance the learning atmosphere.
p.s. I would also like it if you could bring a metaphorical closet to workshop as well!
i thought i was supposed to be the scribe for this past week, did i get it mixed up? and i also don't know how to post on the main page, please help.
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