Method frostControlSetPointLimit

src/EnergyPlus/UnitarySystem.cc:1400–1440

    }

    void UnitarySys::frostControlSetPointLimit(EnergyPlusData &state,
                                               Real64 &TempSetPoint,       // temperature setpoint of the sensor node
                                               Real64 &HumRatSetPoint,     // humidity ratio setpoint of the sensor node
                                               Real64 const BaroPress,     // barometric pressure, Pa [N/m^2]
                                               Real64 const TfrostControl, // minimum temperature limit for frost control
                                               int const ControlMode       // temperature or humidity control mode
    )
    {

        // SUBROUTINE INFORMATION:
        //       AUTHOR         Bereket Nigusse, FSEC
        //       DATE WRITTEN   January 2013

        // PURPOSE OF THIS SUBROUTINE:
        // Controls the frost formation condition based on user specified minimum DX coil outlet
        // air temperature. Resets the cooling setpoint based on the user specified limiting
        // temperature for frost control.

        // SUBROUTINE PARAMETER DEFINITIONS:
        int constexpr RunOnSensible(1); // identifier for temperature (sensible load) control
        int constexpr RunOnLatent(2);   // identifier for humidity (latent load) control
        static constexpr std::string_view routineName("FrostControlSetPointLimit");

        Real64 AirMassFlow = state.dataLoopNodes->Node(this->CoolCoilInletNodeNum).MassFlowRate;
        if (ControlMode == RunOnSensible && AirMassFlow > HVAC::SmallAirVolFlow &&
            TempSetPoint < state.dataLoopNodes->Node(this->CoolCoilInletNodeNum).Temp) {
            if (TempSetPoint < TfrostControl) {
                TempSetPoint = TfrostControl;
                this->m_FrostControlStatus = 1;
            }
        } else if (ControlMode == RunOnLatent && AirMassFlow > HVAC::SmallAirVolFlow &&
                   HumRatSetPoint < state.dataLoopNodes->Node(this->CoolCoilInletNodeNum).HumRat) {
            Real64 HumRatioSat = Psychrometrics::PsyWFnTdpPb(state, TfrostControl, BaroPress, routineName);
            if (HumRatioSat > HumRatSetPoint) {
                HumRatSetPoint = HumRatioSat;
                this->m_FrostControlStatus = 2;
            }
        } else {
            this->m_FrostControlStatus = 0;
        }
    }

    void UnitarySys::getUnitarySystemInput(EnergyPlusData &state, std::string_view objectName, bool const ZoneEquipment, int const ZoneOAUnitNum)
    {