com.synerset.hvacengine.process.drycooling.DryCoolingFromPower Maven / Gradle / Ivy

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HVAC|Engine is a comprehensive library for calculating moist air properties, including crucial thermodynamic processes such as heating, dry cooling, real cooling with condensate discharge, mixing single or multiple air streams, and more. Immutable, thread-safe, very accurate.

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package com.synerset.hvacengine.process.drycooling;

import com.synerset.hvacengine.fluids.humidair.FlowOfHumidAir;
import com.synerset.hvacengine.fluids.humidair.HumidAir;
import com.synerset.hvacengine.fluids.humidair.HumidAirEquations;
import com.synerset.unitility.unitsystem.thermodynamic.Power;
import com.synerset.unitility.unitsystem.thermodynamic.Temperature;

/**
 * Calculates outlet temperature for dry cooling case based on input cooling power (inputHeat). Input heat must be
 * passed negative value.
 * IMPORTANT: Inappropriate use of dry cooling will produce significant overestimation of outlet temperature or
 * underestimation of required cooling power! Real cooling methodology is recommended to use as relatively accurate
 * representation of a real working cooling process.
 *
 * REFERENCE SOURCE: [1][2] [t2,oC] (42)(2.2) [6.12][37]
 *
 * @param inletAir   initial {@link FlowOfHumidAir}
 * @param inputPower cooling {@link Power}
 */
record DryCoolingFromPower(FlowOfHumidAir inletAir,
                           Power inputPower) implements DryCoolingStrategy {

    @Override
    public DryAirCoolingResult applyDryCooling() {

        if (inputPower.isEqualZero() || inletAir.getMassFlow().isEqualZero()) {
            return new DryAirCoolingResult(inletAir, inputPower.withValue(0));
        }

        double qCool = inputPower.getInKiloWatts();
        double xIn = inletAir.getHumidityRatio().getInKilogramPerKilogram();
        double mdaIn = inletAir.getDryAirMassFlow().getInKilogramsPerSecond();
        double pIn = inletAir.getPressure().getInPascals();
        double iIn = inletAir.getSpecificEnthalpy().getInKiloJoulesPerKiloGram();
        double iOut = (mdaIn * iIn + qCool) / mdaIn;
        double tOut = HumidAirEquations.dryBulbTemperatureIX(iOut, xIn, pIn);

        HumidAir outletHumidAir = HumidAir.of(inletAir.getPressure(), Temperature.ofCelsius(tOut), inletAir.getHumidityRatio());
        FlowOfHumidAir outletFlow = FlowOfHumidAir.ofDryAirMassFlow(outletHumidAir, inletAir.getDryAirMassFlow());

        return new DryAirCoolingResult(outletFlow, inputPower);
    }

}