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66 lines
2.3 KiB
Markdown
66 lines
2.3 KiB
Markdown
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Frequently Asked Questions
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==========================
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Usage
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-----
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1. My enthalpy and entropy values are not the same as what are used in REFPROP, or EES, or ...
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Values for enthalpy, entropy and internal energy are calculated as *differences*
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with respect to an arbitrarily chosen reference state.
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As a consequence, absolute values may differ hugely between different tools,
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but the difference between two states should be equal.
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At least the following three states are frequently chosen as reference states:
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IIR: saturated liquid (Q=0) at T=273.15 K
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ASHRAE: saturated liquid (Q=0) at T=233.15 K
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NBP: saturated liquid (Q=0) at p=101325.0 Pa
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2. My calls to REFPROP fail with a mysterious `Segementation Fault`:
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Make sure that you have at least REFPROP version 9.1 installed. If you have a license for 9.0,
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the upgrade is for free: http://www.nist.gov/srd/nist23.cfm
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3. Transport properties
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1. Fluid XY does not have viscosity/thermal conductivity/ ...
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Please have a look at
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http://www.coolprop.org/fluid_properties/PurePseudoPure.html#list-of-fluids
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if there is no reference for your property, we do not have the information required to
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implement the functionality. If you file an issue, please provide information and
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a link to a publication with the required data.
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1. ..but it used to work in an earlier version of CoolProp
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For some fluids, version 5 does not have transport properties even though version 4 had
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that information. We decided to remove some correlations, which had very large uncertainties
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and we would like to make the user aware of the fact that the old implementation was
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experimental and results were not reliable at all.
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Compilation
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-----------
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1. I'm on linux and I get compilation errors like
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```
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gcc: error trying to exec 'cc1plus': execvp: No such file or directory
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error: Setup script exited with error: command 'gcc' failed with exit status 1
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```
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This means that the g++ package is missing. On OpenSUSE you can just install the following packages in software manager:
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```
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gcc-c++
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gcc48-c++
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libstdc++48-devel
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```
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On ubuntu, it should be sufficient to just run
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```
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sudo apt-get install g++
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```
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