com.synerset.hvacengine.process.mixing.MixingOfMultipleFlows 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.common.exceptions.InvalidArgumentException;
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.flows.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 multiple humid air flows.
 */
record MixingOfMultipleFlows(FlowOfHumidAir inletAir,
                             List recirculationAirFlows) implements MixingStrategy {

    MixingOfMultipleFlows {
        Validators.requireNotNull(inletAir);
        Validators.requireNotNull(recirculationAirFlows);
    }

    @Override
    public AirMixingResult applyMixing() {
        double mda_out = inletAir.dryAirMassFlow().getInKilogramsPerSecond();
        double xMda = mda_out * inletAir.humidityRatio().getInKilogramPerKilogram();
        double iMda = mda_out * inletAir.specificEnthalpy().getInKiloJoulesPerKiloGram();
        double p_out = inletAir.pressure().getInPascals();

        for (FlowOfHumidAir flow : recirculationAirFlows) {
            mda_out += flow.dryAirMassFlow().getInKilogramsPerSecond();
            xMda += flow.dryAirMassFlow().getInKilogramsPerSecond() * flow.fluid().humidityRatio().getInKilogramPerKilogram();
            iMda += flow.dryAirMassFlow().getInKilogramsPerSecond() * flow.fluid().specificEnthalpy().getInKiloJoulesPerKiloGram();
            p_out = Double.max(p_out, flow.pressure().getInPascals());
        }

        if (mda_out == 0) {
            throw new InvalidArgumentException(String.format("Sum of all dry air mass recirculationFlows. %s", mda_out));
        }

        double x_out = xMda / mda_out;
        double i_out = iMda / mda_out;
        double t_out = HumidAirEquations.dryBulbTemperatureIX(i_out, x_out, p_out);

        HumidAir outletHumidAir = HumidAir.of(Pressure.ofPascal(p_out),
                Temperature.ofCelsius(t_out),
                HumidityRatio.ofKilogramPerKilogram(x_out));

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

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

}