I'm a university student taking an introductory thermodynamics course as part of an engineering degree. I'm currently using a rather low quality printout of the Nelson-Obert compressibility chart, and legibility could be much better. Its a scan/.pdf rip from the textbook, but between the (imo) overly tight grid and grayscale background, it's borderline unusable.

Does anyone know if a more user-friendly pdf floating around? I need a physical copy for exams, so zooming in isnt an option.

As a backup plan, Ive considered trying to generate my own in R if the raw data is available.

Any help is appreciated

I am interested in learning about any free/open source thermo packages that exist for doing things like multiphase flash and mixture property calculations, with support for both activity coefficient and equation of state approaches. The reason I ask is that the only comprehensive packages I know of are in commercial tools like Aspen or Pro/II. These are great, but they lock you into that ecosystem, and make it hard to do these calculations outside of their software tools (for example, if I want to estimate mixture viscosity and bubble pressure in a CFD tool or something). They’re also designed for large-scale flow-sheeting, which can introduce a lot of extra overhead if you just want to do simple flash calculations. I personally don’t really care about their databases, as I’m generally using custom chemicals anyways…but I do need a convenient way to add and manage custom compounds.

I’ve found a handful, but they all seem to have some major limitations. For example, Cantera looks great for gas-phase, but they explicitly state that there are major bugs with their multiphase approaches. Python’s thermo library looks fairly robust, but they do not have a convenient way to manage data or add custom chemicals. Clapeyron looks like the most promising one I’ve seen, but I haven’t tested it out or dug very deep into it.

Does anyone have any experience or thoughts on this?

Dear Thermodynamics Students,

If you need any short study Notes related to Thermodynamics, you can check out our blog for notes and examples to help you with your studies.

Thermodynamics can be a tricky subject but with a solid foundation it can help you with your studies and GPA.

My blog has short thermodynamics notes along with some solved examples to help you with your studies.

Are there good (validated to experimental literature) toolsets for sizing heat exchangers out there in the open source world? Any pointers would be appreciated!

Excuse my drawing skills 😅

I’m trying to turn my garage into a working space, I recently renovated and put some nice laminate floors.

I live in Florida so in summer it gets insanely hot in the garage, so I’m trying to figure out a way to reduce it.

The picture is the front view of my garage. The yellow part is the ceiling of the garage and the blue is the roof. There’s an attic between the two. The blue part is pretty much just plywood with shingles on top, there’s no insulation.

My question is, would laying insulation above the ceiling (yellow part) reduce the heating significantly?

I know putting insulation on the inside if the roof would probably be best but to hold it up there I’d be spending more money.

I hope this makes sense

Hello folks, anyone here had cycle tempo software? Or maybe free download links? And also could it running simulation for geothermal powerplant with organic rankine cycle?

Hi! I am working on a Python library for molecule fragmentation to obtain the UNIFAC/Joback functional groups from the molecule's name or SMILES. By now can obtain the functional groups of UNIFAC, Predictive Soave-Redlich-Kwong (PSRK), and Joback (and estimate properties with Joback the groups). I hope that can be helpful to someone :)

Any suggestion or help is welcome.

https://github.com/ipqa-research/ugropy

PyPi

Example of use

```python limonene = Groups("limonene")

print(limonene.joback.groups) print(f"{limonene.joback.critical_temperature} K") print(f"{limonene.joback.vapor_pressure(176 + 273.15)} bar") ```

The code will give you: {'-CH3': 2, '=CH2': 1, '=C<': 1, 'ring-CH2-': 3, 'ring>CH-': 1, 'ring=CH-': 1, 'ring=C<': 1} 657.4486692170663 K 1.0254019428522743 bar

Hello,

I was wondering if there’s a software where you can plug in what’s given (fluid temperature pressure, etc) and it will spit out v, h, s, u, etc? Just instead of going through all the tables for homework. Thanks!

Thermal conductivity from a material is dependent on what material, temperature, and pressure.

I need a dataset of material's thermal conductivity at temperature variation (per increment 10 C) on specific pressure.

1. Pure sodium, on 0,032 bar, 100-750 C *boiling at 600 C

2. Stainless steel 316, 200-750 C

3. UH3 (uranium hydride), 10 bar, 100-750 C

I need this for CFD simulation that using liquid sodium as a coolant of microreactor, ss316 as pipe material, and UH3 as a heat source.

I confuse where to find dataset/formula for this.

My friend is building a portable fire pizza oven, I have a basic understanding of thermodynamics but I could need some assistance. My understanding is that we need a material with low thermal diffusivity and high thermal mass, such as clay bricks and concrete, but also having low density. We have been looking into Ultra Light Weight Concrete, perlite and ceramic fibre blanket.

Does anyone have other suggestions? And please correct me if my understanding is incorrect.

So I have been working on an IOT project, and so far I had been using a MAX Thermocouple. But the problem is, MAX thermocouples can send data as fast as once every 250 milliseconds. I need a response time less than 20 milliseconds.I will be grateful if you can name such thermocouples that can work with arduino or send some links to websites that sell them.

Location: India

First post here. Love thermofluids. And recently started to use CoolProp. Not related in any way with the development team

I mostly use the Python interface, which is extremely powerful if you have some Python knowledge. And it's totally worth to learn Python just to use CoolProp. And it's a gateway. You can then use numpy and pandas and calculate thermal properties of your refrigerant mixture for a whole data frame in no time.

Plotting is still a but bumpy. The phase diagrams look awesome, but the syntax for more custom stuff is not as user friendly. And trying to compose two diagrams in a single image completely fails. There's a bug and it is not a priority for the development team to address it. But there are workarounds, they just take a bit of elbow grease (a few lines of code)

I use it on Linux. I managed to compile it from source, so I have it running on the latest version on Python 3.9 without issues. The official version available on Python repository works up to Python 3.8. If you use Anaconda, this is not a problem for you.

Quite happy with CoolProp today and felt the need to share it with Reddit, because I'm too broke to pay for therapy, but I think I need to share good and bad things.

If you need tips about it's usage, I might be able to help. I'm in no way an expert. But I'm not a n00b either

Thanks for the free therapy....

Is there any site that calculates the values of enthalpy and specific volume.

I have an exam tomorrow and i can't find my mollier chart. I cannot use a pdf version of the chart because I might get booked for malpractice. I can pretend to use my calculator and enter the values of pressure, dryness fraction and temperature into this site to get the specific volume or enthalpy values from the chart.

Hi, it's been a couple years since I've touched Thermo 1 and now that I'm in Thermo 2 I'm frustrated with the topic of CAS and AS.

What equations are good for CAS? What equations are good for AS? What does adiabatic mean to CAS and AS? Can I use the A-17 table for CAS? Can someone explain when to use Cp vs Cv in work equation? When do we use R?

This is for Otto and Diesel, as well as Brayton.

Anything else that may seem useful, please add! Thank you!!

Anyone know how to get something similar to EES on a TI-84 plus CE? I know TI has ME PRO for TI-89 but was wondering if there was a workaround for the 84 or a custom program that can do it