IF97

IF97 is the high-speed package of IAPWS-IF97 in Rust. It is suitable for computation-intensive calculations，such as heat cycle calculations, simulations of non-stationary processes, real-time process monitoring and optimizations.

Through the high-speed packagey, the results of the IAPWS-IF97 are accurately produced at about 5~8x speed-up compared to the powi() of the Rust standard library.

The following input pairs are implemented:

``` (p,t) (p,h) (p,s) (p,x)

(t,x)

(h,s)
```

Usage

The functions are provided in the if97 pacakge:

• ??(in1,in2,propertyID), , e.g:h=pt(p,t,4), the propertyID h is 4
  • first,second input parameters: the input properties(double)
  • third input parameter: the propertyID of the calculated property(int, 0-29), see Properties in libseuif97
  • the return: the calculated property value(double)

Properties in if97

| Properties | Unit | symbol | propertyID | | ------------------------------------- | :---------: | -----: | ---------: | | Pressure | MPa | p | 0 | | Temperature | °C | t | 1 | | Density | kg/m^3 | d | 2 | | Specific Volume | m^3/kg | v | 3 | | Specific enthalpy | kJ/kg | h | 4 | | Specific entropy | kJ/(kg·K) | s | 5 | | Specific exergy | kJ/kg | e | 6 | | Specific internal energy | kJ/kg | u | 7 | | Specific isobaric heat capacity | kJ/(kg·K) | cp | 8 | | Specific isochoric heat capacity | kJ/(kg·K) | cv | 9 | | Speed of sound | m/s | w | 10 | | Isentropic exponent | | ks | 11 | | Specific Helmholtz free energy | kJ/kg | f | 12 | | Specific Gibbs free energy | kJ/kg | g | 13 | | Compressibility factor | | z | 14 | | Steam quality | | x | 15 | | Region | | r | 16 | | Isobaric volume expansion coefficient | 1/K | ec | 17 | | Isothermal compressibility | 1/MPa | kt | 18 | | Partial derivative (dV/dT)p | m3/(kg·K) | dvdt | 19 | | Partial derivative (dV/dP)T | m3/(kg·MPa) | dvdp | 20 | | Partial derivative (dP/dT)v | MPa/K | dpdt | 21 | | Isothermal Joule-Thomson coefficient | kJ/(kg·MPa) | iJTC | 22 | | Joule-Thomson coefficient | K/MPa | JTC | 23 | | Dynamic viscosity | kg/(m·s) | dv | 24 | | Kinematic viscosity | m^2/s | kv | 25 | | Thermal conductivity | W/(m.K) | tc | 26 | | Thermal diffusivity | um^2/s | td | 27 | | Prandtl number | | pr | 28 | | Surface tension | mN/m | st | 29 |

Cite as

• Wang Pei-hong, Jia Jun-ying, Cheng Mao-hua. General Calculating Models of Water and Steam Properties(IAPWS-IF97), Power Engineering, 21 (6), 2001, pp. 1564-1567. (in Chinese)

• Cheng Maohua. SEUIF97: the high-speed shared library of IAPWS-IF97(1.0.1). Zenodo. https://doi.org/10.5281/zenodo.4586961