com.synerset.hvacengine.process.mixing.MixingOfTwoFlows 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.mixing;

import com.synerset.hvacengine.common.Validators;
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.flow.MassFlow;
import com.synerset.unitility.unitsystem.humidity.HumidityRatio;
import com.synerset.unitility.unitsystem.thermodynamic.Pressure;
import com.synerset.unitility.unitsystem.thermodynamic.Temperature;

import java.util.List;

/**
 * Represents strategy implementation of mixing of two humid air flows.
 */
record MixingOfTwoFlows(FlowOfHumidAir inletAir,
                        FlowOfHumidAir recirculationAirFlow) implements MixingStrategy {

    MixingOfTwoFlows {
        Validators.requireNotNull(inletAir);
        Validators.requireNotNull(recirculationAirFlow);
    }

    @Override
    public AirMixingResult applyMixing() {
        double mdaIn = inletAir.getDryAirMassFlow().getInKilogramsPerSecond();
        double mdaRec = recirculationAirFlow.getDryAirMassFlow().getInKilogramsPerSecond();
        double mdaOut = mdaIn + mdaRec;

        if (mdaIn == 0.0) {
            return new AirMixingResult(inletAir, recirculationAirFlows(), recirculationAirFlow);
        }

        if (mdaRec == 0.0 || mdaOut == 0.0) {
            return new AirMixingResult(inletAir, recirculationAirFlows(), inletAir);
        }

        double xIn = inletAir.getHumidityRatio().getInKilogramPerKilogram();
        double xRec = recirculationAirFlow.getHumidityRatio().getInKilogramPerKilogram();
        double pIn = inletAir.getPressure().getInPascals();
        double iIn = inletAir.getSpecificEnthalpy().getInKiloJoulesPerKiloGram();
        double iRec = recirculationAirFlow.getSpecificEnthalpy().getInKiloJoulesPerKiloGram();

        double xOut = (mdaIn * xIn + mdaRec * xRec) / mdaOut;
        double iOut = (mdaIn * iIn + mdaRec * iRec) / mdaOut;
        double tOut = HumidAirEquations.dryBulbTemperatureIX(iOut, xOut, pIn);

        HumidAir outletHumidAir = HumidAir.of(Pressure.ofPascal(pIn),
                Temperature.ofCelsius(tOut),
                HumidityRatio.ofKilogramPerKilogram(xOut));

        FlowOfHumidAir outletFlow = FlowOfHumidAir.ofDryAirMassFlow(outletHumidAir, MassFlow.ofKilogramsPerSecond(mdaOut));


        return new AirMixingResult(inletAir, recirculationAirFlows(), outletFlow);
    }

    @Override
    public List recirculationAirFlows() {
        return List.of(recirculationAirFlow);
    }

}