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.HvacEngineArgumentException;
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.Collection;

/**
 * Represents strategy implementation of mixing of multiple humid air flows.
 */
record MixingOfMultipleFlows(FlowOfHumidAir inletAir,
                             Collection recirculationAirFlows) implements MixingStrategy {

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

    @Override
    public AirMixingResult applyMixing() {
        double mdaOut = inletAir.getDryAirMassFlow().getInKilogramsPerSecond();
        double xMda = mdaOut * inletAir.getHumidityRatio().getInKilogramPerKilogram();
        double iMda = mdaOut * inletAir.getSpecificEnthalpy().getInKiloJoulesPerKiloGram();
        double pOut = inletAir.getPressure().getInPascals();

        for (FlowOfHumidAir flow : recirculationAirFlows) {
            mdaOut += flow.getDryAirMassFlow().getInKilogramsPerSecond();
            xMda += flow.getDryAirMassFlow().getInKilogramsPerSecond() * flow.getFluid().getHumidityRatio().getInKilogramPerKilogram();
            iMda += flow.getDryAirMassFlow().getInKilogramsPerSecond() * flow.getFluid().getSpecificEnthalpy().getInKiloJoulesPerKiloGram();
            pOut = Double.max(pOut, flow.getPressure().getInPascals());
        }

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

        double xOut = xMda / mdaOut;
        double iOut = iMda / mdaOut;
        double tOut = HumidAirEquations.dryBulbTemperatureIX(iOut, xOut, pOut);

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

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

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

}