com.synerset.hvacengine.process.drycooling.DryCoolingFromTemperature 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.flow.MassFlow;
import com.synerset.unitility.unitsystem.thermodynamic.Power;
import com.synerset.unitility.unitsystem.thermodynamic.Temperature;

/**
 * Calculates outlet cooling power (heat of a process) for dry cooling case based on target outlet temperature.
 * The Target temperature must be lower than inlet flow temp for a valid cooling case.
 * 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 a relatively accurate representation of a real world cooling process.
 * 
 * REFERENCE SOURCE: [1][2] [t2,oC] (42)(2.2) [6.12][37]
 *
 * @param inletAir          initial {@link FlowOfHumidAir}
 * @param outletTemperature target {@link Temperature}
 */
record DryCoolingFromTemperature(FlowOfHumidAir inletAir,
                                 Temperature outletTemperature) implements DryCoolingStrategy {

    @Override
    public DryAirCoolingResult applyDryCooling() {

        // The Target temperature must be lower than inlet temperature for a valid cooling case.
        if (outletTemperature.isEqualOrGreaterThan(inletAir.getTemperature()) || inletAir.getMassFlow().isEqualZero()) {
            return new DryAirCoolingResult(inletAir, Power.ofWatts(0));
        }

        // If the target temperature is below dew point temperature, it is certain that this is no longer dry cooling
        if (outletTemperature.isLowerThan(inletAir.getFluid().getDewPointTemperature())) {
            return new DryAirCoolingResult(inletAir, Power.ofWatts(0));
        }

        double xIn = inletAir.getHumidityRatio().getInKilogramPerKilogram();
        double mdaIn = inletAir.getDryAirMassFlow().getInKilogramsPerSecond();
        double tOut = outletTemperature.getInCelsius();
        double pIn = inletAir.getPressure().getInPascals();
        double iIn = inletAir.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 DryAirCoolingResult(outletFlow, requiredHeat);

    }

}