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MEASUR-Tools-Suite v1.0.11
The MEASUR Tools Suite is a collection of industrial efficiency calculations written in C++ and with bindings for compilation to WebAssembly.
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Physical constants defined in U.S. Customary units.
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| constexpr double | kOrificeAreaFactor = 1300.0 |
| Orifice area factor for volumetric flow calculations \([\unit{\dimensionless}]\). | |
| constexpr double | kAtmosphericPressurePsi = 14.7 |
| Standard atmospheric pressure at sea level \([\unit{psia}]\). | |
| constexpr double | kWaterBoilingPointF = 212.0 |
| Boiling point of water \([\unit{\degreeFahrenheit}]\). | |
| constexpr double | kSpecificHeatWaterVapor = 0.481 |
| Specific heat of water vapor \([\unit{\btu\per\pound\degreeFahrenheit}]\). | |
| constexpr double | kWaterEvaporation = 970.0 |
| Latent heat of evaporation for water \([\unit{\btu\per\pound}]\). | |
| constexpr double | kStefanBoltzmann = 1.713441e-9 |
| Stefan–Boltzmann constant \([\unit{\btu\per\hour\foot\squared\degreeRankine\tothe{4}}]\). | |
| constexpr double | kStandardGasTemperatureR = 520.0 |
| Standard gas temperature for exhaust calculations \([\unit{\degreeRankine}]\). | |
| constexpr double | kAmbientTemperatureF = 60.0 |
| Ambient reference temperature for exhaust calculations \([\unit{\degreeFahrenheit}]\). | |
| constexpr double | kSpecificHeatAirBase = 0.017828518 |
| Base specific heat of air \([\unit{\btu\per\pound\degreeFahrenheit}]\). | |
| constexpr double | kSpecificHeatAirCoeff = 0.000002556 |
| Temperature coefficient for specific heat of air \([\unit{\btu\per\pound\degreeFahrenheit\per\degreeFahrenheit}]\). | |
| constexpr double | kAirCorrectionBase = -1.078913827 |
| Base for air correction in exhaust gas heat loss calculations \([\unit{\btu\per\pound}]\). | |
| constexpr double | kWaterDensity = 8.335 |
| Water density \([\unit{lb/gal}]\). | |
| constexpr double | kAirSensibleHeatFactor = 1.08 |
| Sensible heat factor for air flow \([\unit{Btu\cdot\minute\per(\cubicFoot\cdot\degreeF\cdot\hour)}]\). | |
| constexpr double | kWaterSensibleHeatFactor = 500.0 |
| Sensible heat factor for water flow \([\unit{Btu\cdot\minute\per(\gallon\cdot\degreeF\cdot\hour)}]\). | |
| constexpr double | kGravityFtPerSec2 = 32.174 |
| Gravitational acceleration in U.S. customary units \([\unit{\foot\per\second\squared}]\). | |
| constexpr double | kStandardGravityApprox = 32.2 |
| Conventional engineering approximation for standard gravity \([\unit{\foot\per\second\squared}]\). | |
| constexpr double | kSpecificGasConstantAir = 53.34 |
| Specific gas constant for dry air in U.S. customary units. | |
| constexpr double | kGammaAir = 1.4 |
| Ratio of specific heats (adiabatic index) for dry air \([\unit{\unitless}]\). | |
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Used for exhaust gas heat loss calculations in non-EAF electric furnaces.
Definition at line 119 of file constants.h.
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Product of standard air density (0.075 lb/ft³), specific heat of air (0.24 Btu/lb·°F), and the minutes-to-hours conversion factor (60 min/hr): 0.075 × 0.24 × 60 = 1.08. Used to calculate sensible heat transfer rate of an air stream in U.S. customary units.
Definition at line 133 of file constants.h.
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Definition at line 101 of file constants.h.
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Used as the reference pressure for gas property and flow calculations in U.S. customary units.
Definition at line 68 of file constants.h.
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gamma = Cp/Cv = 1.4 for dry air at typical compressed-air operating conditions (below ~250°F). Used in isentropic flow and orifice discharge calculations.
Definition at line 168 of file constants.h.
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Precise value of standard gravity.
Definition at line 145 of file constants.h.
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Empirical, effectively dimensionless factor used in U.S. customary orifice meter equations to convert orifice diameter (in) squared to effective area for volumetric flow (scfh).
Definition at line 61 of file constants.h.
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53.34 ft·lbf / (lbm·°R). Derived from the universal gas constant divided by the molar mass of air: R = 1545 ft·lbf/(lbmol·°R) / 28.97 lbm/lbmol = 53.34 ft·lbf/(lbm·°R). Used in ideal-gas density calculations for compressed-air engineering.
Definition at line 161 of file constants.h.
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Used for exhaust gas heat loss calculations in non-EAF electric furnaces.
Definition at line 107 of file constants.h.
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Used for exhaust gas heat loss calculations in non-EAF electric furnaces.
Definition at line 113 of file constants.h.
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Definition at line 78 of file constants.h.
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This is an absolute temperature (520°R = 60°F + 460), commonly used as the reference for gas property calculations in U.S. customary units.
Definition at line 96 of file constants.h.
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32.2 ft/s² is the rounded value used in U.S. customary compressible-flow and gas-dynamics calculations (e.g., orifice and nozzle flow equations). The precise standard value is 32.174 ft/s². The approximation is used here to match established industry formula coefficients.
Definition at line 153 of file constants.h.
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Source: [2]
Definition at line 89 of file constants.h.
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Definition at line 73 of file constants.h.
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Used for water flow calculations in process heating systems. Source: CRC Handbook of Chemistry and Physics.
Definition at line 125 of file constants.h.
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Definition at line 83 of file constants.h.
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Product of standard water density (8.33 lb/gal), specific heat of water (1.0 Btu/lb·°F), and the minutes-to-hours conversion factor (60 min/hr): 8.33 × 1.0 × 60 ≈ 500. Used to calculate sensible heat transfer rate of a water stream in U.S. customary units.
Definition at line 141 of file constants.h.
1.9.8