Also, regarding problem 18, while you can present your answer in Btu/s, it is better to give it in hp (horsepower). Thanks.
-Avi

Hi Class,
I have a few notes for this assignment:
- For problem 16, since temperatures are given in English units, present your answers in Btu/lb-mol
- For problem 17, you can use 4.18 kJ/kg*K for the Cp of water
These two comments also apply for the rest of the course.
-Avi

Hi Class,
I'm not sure if you know this but just in case:
My office is #3218
-Avi

Monday Office Hours

Hi Class,
I'm sorry, but something has come up, so I need to cancel today's office hours. To make up for this, I'll extend my office hours tomorrow - it will be 5-7pm. Furthermore, I will be avaliable all day tomorrow in my office, in case you have some questions for me. Also, feel free to send me an email.
-Avi

Problem 19

The formula for the cost stated on this problem is in dollars ($).
MSS

Solution to part d of problem session

Hi class-

The correct solution to part d of the problem session we worked in class today is:

eta = 1 - (1/r)^(gamma - 1)

In class, I initially wrote (1-gamma) incorrectly.

Please do spend 10 minutes working parts (c) and (d) if you haven't already gotten to the answer. This will help prepare you when you start your problem set.

Cheers,
MSS

Thought problem on HW3

Hi class,

For this problem, you will want to come up with an analytic expression for the work that involves only the temperature T, the initial and final volumes and pressures (V1, V2, P1, P2), and an integral int f(P) dP, since these are the things that you know or could do, according to the problem statement.

MSS

By the way, regarding the thought porblem on this problem set, you'll need to show some calculus (rather than just abstractly discuss it).

Hi Class,
Although Monday is a holiday, I'll be holding office hours that day if anyone is interested. If I'm not in the regular classroom, that means I'm in my office (feel free to pop in). In any case, there'll also be office hours on Tuesday.
-Avi

PS2 thought problem

A quick note: instead of "chain rule" it should say "product rule". Also, you may recall that the product rule in integral calculus takes the form of "integration by parts."

HW2, problem 6 hint

By definition, the constant-pressure heat capacity is given by

Cp = d(U + PV)/dT

However, for liquids the molar volume V changes very little upon heating. Therefore, at constant pressure, we can neglect the second term to good approximation in liquids:

Cp ~ dU/dT

Rearranging, we arrive at an equation we can integrate to get a relation between U and T:

Cp dT = dU

-MSS

Discussion section time

I was asked if it would be possible to move the discussion section time, if the entire class were able to agree upon some other choice. Unfortunately, this would be very difficult to do since, in addition to making sure that it worked with each students' schedule (a challenging task), we would need to go through an official request with the registrar to find another suitable room. Therefore, I believe we must leave the time as it is. Apologies, but sometimes this is just how things work out.

Cheers,
MSS

Hi Thermo Students,
On problem set #2, realize that the "ton" and the "gal" are the US units (since we don't live in the UK). Here are the corresponding conversions you need to use:
1 ton = 907.18 kg
264.17 gal = 1 m^3
Just remember that the same goes for all subsequent problems you will have in the course...
-Avi

Office hours

Dear class,

Office hours for the course will be as follows:

Friday 1:00-2:50pm - my office
Monday 4-5pm - Engr II 3301
Tuesday 5-6pm - Engr II 3301

MSS

Also, I forgot to reiterate one more thing. Remember, this is not an actual project you will have to do, this is just a fictitious proposal.

Problem Set No. 1

Hi Class,
I just wanted to clarify for you the thermo you need to discuss in your email. For my example, I'll use the steam engine. So, just as Dr. Shell mentioned in class, do not pick this as your example.

Foremost, you want to discuss the thermo embodiment in your example. You can discuss: different transformations in energy, driving forces, phase changes, connection of entropy, etc.
My example - Heat flows from the hotter firebox to the colder boiler, making chemical energy in fuel transform into mechanical energy in machinery...

Also, you want to discuss a possible thermo analysis aspect of your example (something that would be interesting to calculate if implementing the example). You can discuss: optimum operating conditions, energy efficiency, amount of heat/work, solubility limits, etc.
My example - It would be interesting to calculate the required operating temperature of the firebox and boiler that yields the optimum energy conversion efficiency...

In any case, the entire goal of the assignment is to have you communicate in a scientifically proper way. So, you will be mostly graded for language/format. I don't have official office hours this week, but if you have any questions, feel free to contact me by email or to stop by my office.
Cheers,
Avi

ChE110A W09 Problem Set 1

Dear class-
For this assignment, just send a plain-text email memo. There is no need to compose the memo in a separate document and attach it.
MSS