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 5-20x speed-up compared to using the powi() of the Rust standard library in the forloop directly when computing the basic equations of Region 1,2,3.

• The comparison results of the computing-time are obtained using the criterion.rs.

The Fast Methods

1. The multi-step method unleashes the full power of the compiler optimizations while using powi() with the for loop
2. The recursive method computes the polynomial values of the base variable and its derivatives

In IF97, 36 thermodynamic, transport and further properties can be calculated.

The following input pairs are implemented:

(p,t) (p,h) (p,s) (p,v) 

(t,h) (t,s) (t,v) 

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

(h,s)  

Usage

Install the crate

cargo add if97

The type of functions are provided in the if97 package:

fn(f64,f64,i32) -> f64

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

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
pv(p:f64,v:f64,o_id:i32)->f64

th(t:f64,h:f64,o_id:i32)->f64
ts(t:f64,s:f64,o_id:i32)->f64
tv(t:f64,v:f64,o_id:i32)->f64

px(p:f64,x:f64,o_id:i32)->f64
tx(p:f64,x:f64,o_id:i32)->f64
hx(h:f64,x:f64,o_id:i32)->f64
sx(s:f64,x:f64,o_id:i32)->f64

hs(h:f64,s:f64,o_id:i32)->f64

Example

use if97::*;
fn main() {
    
    let p:f64 = 3.0;
    let t:f64= 300.0-273.15;
   
    let h=pt(p,t,OH);
    let s=pt(p,t,OS);
    let v=pt(p,t,OV);
    println!("p={p:.6} t={t:.6} h={t:.6} s={s:.6} v={v:.6}");   
}

Properties