insulated_pipe_reduction.h

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#pragma once
 
#include <vector>
 
namespace insulated_pipe_reduction {
 
struct InsulatedPipeInput {
    int    operating_hours                   = 0;   
    double pipe_length                       = 0.0; 
    double pipe_diameter                     = 0.0; 
    double pipe_thickness                    = 0.0; 
    double pipe_temperature                  = 0.0; 
    double ambient_temperature               = 0.0; 
    double wind_velocity                     = 0.0; 
    double system_efficiency                 = 1.0; 
    double insulation_thickness              = 0.0; 
    double pipe_emissivity                   = 0.0; 
    double jacket_emissivity                 = 0.0; 
    std::vector<double> pipe_material_coefficients;        
    std::vector<double> insulation_material_coefficients;  
};
 
struct InsulatedPipeOutput {
    double heat_loss_per_length = 0.0; 
    double annual_heat_loss     = 0.0; 
};
 
InsulatedPipeOutput calculate(const InsulatedPipeInput& input);
 
InsulatedPipeOutput insulatedPipeHeatLoss(const InsulatedPipeInput& input);
 
InsulatedPipeOutput bareInsulatedPipeHeatLoss(const InsulatedPipeInput& input);
 
double thermalResistance(double diameter_a, double diameter_b, double diameter_c,
                         double thermal_conductivity);
 
double reynoldsNumber(double diameter, double wind_velocity, double kinematic_viscosity);
 
double rayleighNumber(double expansion_coefficient, double surface_temperature,
                      double ambient_temperature, double diameter,
                      double kinematic_viscosity, double alpha);
 
double nusseltNumber(double nusselt_forced, double nusselt_free);
 
double nusseltForcedConvection(double reynolds, double prandtl);
 
double nusseltFreeConvection(double rayleigh, double prandtl);
 
double radiativeHeatTransferCoefficient(double emissivity, double surface_temperature,
                                        double ambient_temperature);
 
double convectiveHeatTransferCoefficient(double nusselt, double air_conductivity, double diameter);
 
} // namespace insulated_pipe_reduction