com.synerset.hvacengine.process.heating.HeatingFromTemperature 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.heating;

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.thermodynamic.Power;
import com.synerset.unitility.unitsystem.thermodynamic.Temperature;

/**
 * Calculates outlet heat of process for heating case based on target temperature.
 * This method can be used only for heating, inQ must be passed as positive value
 * REFERENCE SOURCE: [1][2] [t2,oC] (42)(2.2) [6.12][37]
 *
 * @param inletAir          initial {@link FlowOfHumidAir}
 * @param targetTemperature target outlet {@link Temperature}
 */
record HeatingFromTemperature(FlowOfHumidAir inletAir,
                              Temperature targetTemperature) implements HeatingStrategy {

    @Override
    public AirHeatingResult applyHeating() {

        if (inletAir.getTemperature().equals(targetTemperature) || inletAir.getMassFlow().isEqualZero()) {
            return new AirHeatingResult(inletAir, Power.ofWatts(0));
        }

        HumidAir inletHumidAir = inletAir.getFluid();
        double xIn = inletHumidAir.getHumidityRatio().getInKilogramPerKilogram();
        double mdaIn = inletAir.getDryAirMassFlow().getInKilogramsPerSecond();
        double tOut = targetTemperature.getInCelsius();

        double pIn = inletHumidAir.getPressure().getInPascals();
        double iIn = inletHumidAir.getSpecificEnthalpy().getInKiloJoulesPerKiloGram();
        double i2 = HumidAirEquations.specificEnthalpy(tOut, xIn, pIn);
        double qHeat = (mdaIn * i2 - mdaIn * iIn) * 1000d;
        Power requiredHeat = Power.ofWatts(qHeat);

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

        return new AirHeatingResult(outletFlow, requiredHeat);
    }

}