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 package, the results of the IAPWS-IF97 are accurately produced at about 5~10x speed-up compared to the powi() of the Rust standard library，5x speed-up compared to the shared library in C using the same fast algorithms.

The following input pairs are implemented:

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

(t,x)

(h,s)
```

Usage

Install the crate

bash cargo add if97

The type of functions are provided in the if97 package:

```rust fn(f64,f64,i32) -> f64; ``````

• first,second input parameters: the input propertry pairs(f64)
• third input parameter: o_id - the property ID of the calculated property(i32)
• the return: the calculated property value(f64)

rust pt(p:f64,t:f64,o_id::i32)->f64; ph(p:f64,h:f64,o_id::i32)->f64; ps(p:f64,s:f64,o_id::i32)->f64; hs(h:f64,s:f64,o_id::i32)->f64; px(p:f64,x:f64,o_id::i32)->f64; tx(p:f64,x:f64,o_id::i32)->f64; Examples

```rust use if97::pt; fn main() {

let p:f64 = 3.0;
let t:f64= 300.0-273.15;

let h=pt(p,t,if97::OH);
let s=pt(p,t,if97::OS);
let v=pt(p,t,if97::OV);

println!("p={} t={} h={} s={} v={}",p,t,h,s,v);

} ```

Properties in if97

| Propertry | Unit | Symbol | o_id |
| ------------------------------------- | :---------: | ------:|-----:| | Pressure | MPa | p | OP | | Temperature | °C | t | OT | | Density | kg/m^3 | d | OD | | Specific Volume | m^3/kg | v | OV | | Specific enthalpy | kJ/kg | h | OH | | Specific entropy | kJ/(kg·K) | s | OS | | Specific internal energy | kJ/kg | u | OU | | Specific isobaric heat capacity | kJ/(kg·K) | cp | OCP | | Specific isochoric heat capacity | kJ/(kg·K) | cv | OCV | | Speed of sound | m/s | w | OW | | Steam quality | | x | OX | | Region | | r | OR | | Dynamic viscosity | kg/(m·s) | dv | ODV | | Kinematic viscosity | m^2/s | kv | OKV | | Thermal conductivity | W/(m.K) | tc | OTC | | Thermal diffusivity | m^2/s | td | OTD | | Prandtl number | | pr | OPR | | Surface tension | N/m | st | OST | | Static Dielectric Constant | | sdc | OSDC |