velitherm/dist/es/examples/risingAir.js

Basic Thermodynamics Equations for Soaring Flight (from velivole.fr/meteo.guru)

import * as velitherm from 'velitherm';
// When the air rises, its specific humidity remains constant
var q = velitherm.specificHumidity(75, 1017, 25);
console.log('Specific humidity = ', Math.round(q), 'g/kg');
console.log('Dew point = ', velitherm.dewPoint(75, 25).toFixed(2), '°C');
// Find the current pressure at 500m AMSL
var P1 = velitherm.pressureFromAltitude(500, 1017, 25);
console.log('Pressure at 500m = ', Math.round(P1), 'hPa');
// Take into account the dry adiabatic cooling over 500m
var T1 = 25 - 500 * velitherm.gamma;
console.log('The new temperature of the air parcel at 500m = ', T1, '°C');
// Compute the new relative humidity of the air parcel at this pressure and
// temperature
var w1 = velitherm.relativeHumidity(q, P1, T1);
console.log('Relative humidity after rising to 500m = ', Math.round(w1), '%');
// If the air parcel has reached 100% relative humidity, then there is
// condensation
if (w1 < 100) {
    console.log('No, it did not form a cloud');
}
else {
    console.log('Yes, it did form a cloud');
}
// If the density of the air parcel is still lower than the
// surrounding air at 500m AMSL, then it will continue to rise
var rhoParcel = velitherm.airDensity(w1, P1, T1);
var rhoAir500 = velitherm.airDensity(50, P1, 20);
if (rhoParcel < rhoAir500) {
    console.log('The air parcel will continue to rise');
}
else {
    console.log('The ceiling has been reached');
}
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