Thermodynamics - Entropy 7.2 Increase in Entropy Principle 

I think I'll use these videos (and your notes) to prepare for my PhD qualifying exam

Amazing playlist!

QL could be found using QH/TH = QL/TL ---> QL = QH X TL/TH because it is a reversible heat pump.

Will you please make video lectures for chpater 8 and 9? Thank you

thanks a lot

Respected Sir We have to consider here the consideration of an isolated system: some establish the principle of increase of entropy from consideration of heat added and rejected by two heat reservoirs at different temperatures: how Q=0 idea and T1/T2 remains constant idea lead to same destination? Please help?

Thank you so much >_

We were wondering if you could also please upload lectures for chapters 8 and 9?

Entropy of the universe is increasing s gen? or increase in total entropy from heat transfer plus s gen? Or s gen is just another mathematical expression for total sum of entropy changes from all heat transfers in a closed system from source(s) to sink(s)?

Professor sorry to bother you again but I have a confusion here about 0:40 'Carnot devices' are internally reversible but there's only two isothermal stages, which are _isothermal expansion_ and _isothermal compression_ . So I thought carnot cycle is not totally isothermal.Am I right? Or I'm confusing it?

Respected Sir Do isolated systems have surroundings?what type of interactions do occur between them?please help

in the 3rd problem you could just use Qh/Qc=Th/Tc and get ΔS=0

Good video but I think Work in at 24:27 should have a dot over it to note that it's in rate form.

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Im confused about question 7.2 question 2 as it uses q/t to solve the entropy change of the source and sink, are they not irreversible, why are we using an equation that is meant for reversible isothermal processes, not irreversible isothermal processes?

I have a question about 7.3, in the problem statement it says : "Heat pump produces heat at a rate of 300 KW" shouldn't this be QL and not QH, since we take QH from a low temperature reservoir in heat pumps?

In your imagination, If u put your home on top of the condensing unit and the evaporator is left sitting in the background, now u have a heat pump heating your home. And we need heat pump in winters. The backyard becomes source reservoir and the home becomes the sink reservoir. When I was replacing my air conditioning units, I looked for an AC unit with heat pump but did not go for it because it’s more expensive, I settled for cooling only because the furnace takes care of heating in winters. The backyard becomes source reservoir and the home becomes the sink reservoir.