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It's Qa - Wa = Qb - Wb not Q + W

Every textbook has U = Q - W

How is water a vapor at 80 C and 2 bar?

How do i do this with Moles instead of gram Though?

In the last example, on the Enthalpy change, the enthalpy change is only equal to the heat added, as a liquid is incompressible. If the fluid was a compressible gas, wouldn’t we have to account for the PV work (flow work) done also? Or, because the pressure change is zero, there is no PV work?

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Very cryptic. Altough I am still learning the disciplines on ChemeE course day by day, I'm still very disapointed for not having a natural comprehension of the topics my classmates seem to understantand - at least conceptually - so easily.

where can i downlond this biotech software? Im trying to do a probabilty plot in excel but not succeding

I guess you copy fogler without understanding what is going on. I am Disappointed. What is your Tref? Stop copy paste what ever you see in books.

why we didint include that 70mol when we were doing overall balance

Be serious ξ is called ksi

I felt trouble in this concept before but now its clear thanks to you

For an ideal system, this diagram is okay. In practice, one needs to consider the heat transfer coefficient of heat going in and heat going out of the heat pump per time unit. This transfer is temperature difference dependent. For instance, the compressed gas is adiabatically expanded to a temperature below the outdoor temperature. For fast flow at least 10 C below the outdoor temperature. Subsequently the cold expanded gas is heated by the outdoor temperature. Next the gas is compressed to a temperature above the room temperature. Subsequently the temperature drops to the desired room temperature. For efficient fast heat transfer the gas has to compressed to at leat 25 degrees above room temperature. The compressed gas releases the heat to the room to 5 degrees above room temperature. Say room is at T=293 K one needs Th=323 K. Say outside is T=283 K, then the compressed gas of 298 K should expand to 273 K. This gives Qh/W=Th/(Th-Tc)=318/(318-273)=6.

he said if P2 = P1 then enthalpy doesn't change, but enthalpy is based on temp not pressure

Work done ON a gas is negative, work done BY a gas is positive, correct?

can COSMO-RS do this?

How is m3 half the flowrate of m1?

which programm did you use on deriester chart to help you and give you values of k ??

Ooh yeah, I actually watched this video while I was still at school but now that I’m working I fully understand every small detail of each word you said. When I was still at school I noticed I didn’t really pay attention or fully understood the importance of 60% of the video

great video

Good morning/afternoon/evening. Regarding the mole fraction of component 1, x1, at 5:28, should we use the x1 in Alpha phase or the x1 in Beta phase?

how is the temperature of the saturated steam the same as the condensed water? Isn't this essientially a heat exchanger, therefore the heat from the steam exchanges into the green solution meaning the condensed water would be at a lower temperature?

May I know what are the remaining elements in the matrix other than the diagonal? i.e. C01, C02, etc. Thanks.

what is the reason for the 1/3 exponent?

04:20 "So we have a 3.3 molar solution of NaOH, so we need a 3.3 molar solution of HCL to neutralize the stream." It's the mole flowrate of the HCL that needs to match the mole flowrate of NaOH, not the concentration.

By the whims of a system error, the transaction was sent to an invalid email address.

thank you, that's actually so helpful to understand the key concepts in each cell

thank you so much!!

Hi, I tried using this simulation. And I wonder if I can change the feed rate and quality? What if the feed that I want not 50% methanol and 50% water? Thank you in advance

Thank you so much . Iam a NEET UG aspirant from India. And I was stuck in this concept and I was confused badly by mixed answers from various sites . Your one video cleared all confusions. Thank you sir❤

Its Ti - Te and here that's a positive number same as the Work term being positive, fyi

work out of the system is positive, the opposite of Q out of the system which is negative.

How do you find delta h1 and delta h3

can you make for h2o2 beacoming h2o and o2?

what is the question fpr this problem? i mean in words of paragraph?

What's the reason for changing curve concavity by changing fluid? Does it depend on varying K or Cp values by temperature along the heat exchanger?

I DO NOT agree that there is no work in this problem, the volume is increasing 4 fold for christ sakes!! Plus, the piston is being moved for crying out loud!! Total Bull on this one Falconer!!!

Awesome! a very clear explination.

I guess this formula is for UA clean & in case of UA dirty we have to add the fouling factor contributions on the inner & outer of the surface as well. What is the equation for that? Will the fouling factors be assumed from literature or calculated?

Indeed a picture is worth thousand words.

Thanks for the explanation in detail. In case of the reboiler using heat transfer fluid other steam which does not change phase i.e. hot oil, will the heat transfer coefficient of the reboiler be the same as that of the condenser?

Using userform with checkbox in WORD?

Could you explain why in the eq 7 there is + in front of the x1*W, when I found its originally - there

1:02 I have been unable to put/spin the turbun onto my head using this system, any ideas?

So helpful, thanks

Why is there a coefficient of "2" in the mass balance for A? I thought that was already accounted for with the Ca^2

May I know which simulator are you using?

What is x? And what is the purpose of solving x=0.91?

You multiply the H values (BTU per lb) by the total pounds of each stream in your energy balance. Are the units of H in "BTU per lb of total mixture" or "BTU per lb of H2SO4"? If you think about it, the enthalpy of mixing arises from mixing the H2SO4, not the other stuff in solution (which should be arbitrary to the total heat). So accounting for only the masses of H2SO4 from in and out of the mixer in the energy balance makes most sense to me. Is this logic flawed?