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QA docs for contributing [ci skip] (#1679)

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Jeff Henning
2018-03-21 10:26:30 -04:00
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parent f638c89085
commit 5d01a5dfeb
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FAQ.md
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@@ -5,7 +5,7 @@ Frequently Asked Questions
Usage
-----
1. My enthalpy and entropy values are not the same as what are used in REFPROP, or EES, or ...
1. **My enthalpy and entropy values are not the same as what are used in REFPROP, or EES, or ...**
Values for enthalpy, entropy and internal energy are calculated as *differences*
with respect to an arbitrarily chosen reference state.
@@ -17,31 +17,38 @@ Usage
NBP: saturated liquid (Q=0) at p=101325.0 Pa
2. My calls to REFPROP fail with a mysterious `Segementation Fault`:
2. **My calls to REFPROP fail with a mysterious `Segmentation Fault`:**
Make sure that you have at least REFPROP version 9.1 installed. If you have a license for 9.0,
the upgrade is for free: http://www.nist.gov/srd/nist23.cfm
3. Transport properties
1. Fluid XY does not have viscosity/thermal conductivity/ ...
3. **Transport properties missing**
Please have a look at
http://www.coolprop.org/fluid_properties/PurePseudoPure.html#list-of-fluids
if there is no reference for your property, we do not have the information required to
implement the functionality. If you file an issue, please provide information and
a link to a publication with the required data.
a. Fluid XY does not have viscosity/thermal conductivity/ ...
Please have a look at
http://www.coolprop.org/fluid_properties/PurePseudoPure.html#list-of-fluids
if there is no reference for your property, we do not have the information required to
implement the functionality. If you file an issue, please provide information and
a link to a publication with the required data.
1. ..but it used to work in an earlier version of CoolProp
b. ..but it used to work in an earlier version of CoolProp
For some fluids, version 5 does not have transport properties even though version 4 had
that information. We decided to remove some correlations, which had very large uncertainties
and we would like to make the user aware of the fact that the old implementation was
experimental and results were not reliable at all.
For some fluids, version 5 does not have transport properties even though version 4 had
that information. We decided to remove some correlations, which had very large uncertainties
and we would like to make the user aware of the fact that the old implementation was
experimental and results were not reliable at all.
4. **Mixture calculation gives error: Could not match the binary pair [0000-00-0,11-11-1] - for now this is an error.**
Mixture calculations require binary interaction parameters for each pair in the mixture. While many binary interaction parameters are available in the CoolProp library, sadly, many are not. If you get this error message, then the binary interaction parameters for the CAS fluids listed are not available in CoolProp.
If you have data for the binary interaction parameters, you can enter them interactively using the [set_mixture_binary_pair_data](http://www.coolprop.org/dev/fluid_properties/Mixtures.html#id826) function in CoolProp. Otherwise, a more sophisticated mixing model is needed, like the ones in NIST RefProp.
Compilation
-----------
1. I'm on linux and I get compilation errors like
1. **I'm on Linux and I get compilation errors like**
```
gcc: error trying to exec 'cc1plus': execvp: No such file or directory
@@ -62,4 +69,11 @@ Compilation
sudo apt-get install g++
```
2. **Building Python wrapper on Windows fails with an error similar to**
```
error: Microsoft Visual C++ 14.0 is required. Get it with "Microsoft Visual C++ Build Tools": http://landinghub.visualstudio.com/visual-cpp-build-tools
```
Different versions of Python (2.7, 3.6, etc.) are built with and require specific versions of the Microsoft Visual C++ compiler. Please see the [common wrapper prerequisites](http://www.coolprop.org/dev/coolprop/wrappers/index.html#wrapper-common-prereqs) specifically for Windows build requirements.