JTcTD | R Documentation |

The function `JTcTD(Temp,D,digits=9)`

returns the Joule-Thomson coefficient
for given Temp [K] and D [kg/m3].

```
JTcTD(Temp, D, digits = 9)
```

`Temp` |
Temperature [ K ] |

`D` |
Density [ kg m-3 ] |

`digits` |
Digits of results (optional) |

This function calls a Fortran DLL that solves the Helmholtz Energy Equation. in accordance with the Revised Release on the IAPWS Formulation 1995 for the Thermodynamic Properties of Ordinary Water Substance for General and Scientific Use (June 2014) developed by the International Association for the Properties of Water and Steam, http://www.iapws.org/relguide/IAPWS-95.html. It is valid from the triple point to the pressure of 1000 MPa and temperature of 1273. The temperature change produced during a Joule-Thomson expansion is quantified by the Joule-Thomson coefficient, which may be positive (cooling) or negative (heating).

The Joule-Thomson coefficient and an Error Message (if an error occur: errorCodes)

```
Temp <- 500.
D <- 838.025
JT <- JTcTD(Temp,D)
JT
```

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