Factors and functions for unit conversions.

Functions
constexpr double	fahrenheitToKelvin (double fahrenheit)
	Convert Fahrenheit to Kelvin.

constexpr double	fahrenheitToRankine (double fahrenheit)
	Convert Fahrenheit to Rankine.

constexpr double	fahrenheitToCelsius (double fahrenheit)
	Convert Fahrenheit to Celsius.

constexpr double	mmbtuPerHrToKW (double mmbtu_per_hr)
	Converts power from MMBtu/hr to kW.

constexpr double	kWToMMBtuPerHr (double kw)
	Converts power from kW to MMBtu/hr.

Variables
constexpr double	kBtuPerLbFToKJPerKgK = 4.1868
	Conversion factor from Btu/(lb·°F) to kJ/(kg·K).

constexpr double	kFahrenheitToRankineOffset = 459.67
	Offset to convert Fahrenheit to Rankine.

constexpr double	kHoursPerDay = 24.0
	Number of hours in a day.

constexpr double	kMinutesPerHour = 60.0
	Number of minutes in an hour.

constexpr double	kKilowattToBtuPerHour = 3412.136247820839
	Conversion factor from kilowatts to BTU/hr \([\unit{\btu\per\hour\per\kilowatt}]\).

constexpr double	kKgPerM3ToLbPerGal = 0.0083454
	Conversion factor from kilograms per cubic meter to pounds per gallon \([\unit{\pound\per\gallon\per\kilogram\per\meter\cubed}]\).

constexpr double	kMMBtuToBtu = 1'000'000.0
	Conversion factor: 1 MMBtu = 1,000,000 Btu.

constexpr double	kLbPerFt3ToKgPerM3 = 16.018463
	Conversion factor: 1 pound per cubic foot = 16.018463 kilograms per cubic meter \([\unit{\kilogram\per\meter\cubed\per\pound\per\foot\cubed}]\).

constexpr double	kBtuPerTonRefrigeration = 12000.0
	BTU per ton of refrigeration \([\unit{Btu/Ton}]\).

Function Documentation

◆ fahrenheitToCelsius()

constexpr double physics::conversions::fahrenheitToCelsius ( double fahrenheit )

constexpr

Converts a temperature from degrees Fahrenheit to degrees Celsius:

Relation: \begin{equation}\label{eq:fahrenheit-to-celsius} T_C = \frac{5}{9}(T_F - 32)\end{equation}

Symbols

\(T_C\)	Temperature in degrees Celsius \([\unit{ \degreeCelsius}]\)
\(T_F\)	Temperature in degrees Fahrenheit \([\unit{ \degreeFahrenheit}]\)

Parameters

[in] fahrenheit Temperature in degrees Fahrenheit \([\unit{\degreeFahrenheit}]\)

Returns: Temperature in degrees Celsius \([\unit{\degreeCelsius}]\)

Definition at line 208 of file constants.h.

◆ fahrenheitToKelvin()

constexpr double physics::conversions::fahrenheitToKelvin ( double fahrenheit )

constexpr

Converts a temperature from degrees Fahrenheit to Kelvin:

Relation: \begin{equation}\label{eq:fahrenheit-to-kelvin} T_K = (T_F - 32) / 1.8 + 273.15\end{equation}

Symbols

\(T_K\)	Temperature in Kelvin \([\unit{ \kelvin}]\)
\(T_F\)	Temperature in degrees Fahrenheit \([\unit{ \degreeFahrenheit}]\)

Parameters

[in] fahrenheit Temperature in degrees Fahrenheit \([\unit{\degreeFahrenheit}]\)

Returns: Temperature in Kelvin \([\unit{\kelvin}]\)

Definition at line 150 of file constants.h.

◆ fahrenheitToRankine()

constexpr double physics::conversions::fahrenheitToRankine ( double fahrenheit )

constexpr

Converts a temperature from degrees Fahrenheit to degrees Rankine:

Relation: \begin{equation}\label{eq:fahrenheit-to-rankine} T_R = T_F + 459.67\end{equation}

Symbols

\(T_R\)	Temperature in degrees Rankine \([\unit{ \degreeRankine}]\)
\(T_F\)	Temperature in degrees Fahrenheit \([\unit{ \degreeFahrenheit}]\)

Parameters

[in] fahrenheit Temperature in degrees Fahrenheit \([\unit{\degreeFahrenheit}]\)

Returns: Temperature in degrees Rankine \([\unit{\degreeRankine}]\)

Definition at line 190 of file constants.h.

◆ kWToMMBtuPerHr()

constexpr double physics::conversions::kWToMMBtuPerHr ( double kw )

constexpr

1 kW = 0.003412142 MMBtu/hr.

Relation: \begin{equation}\label{eq:kw-to-mmbtu-per-hr} P_\mathrm{MMBtu/hr} = P_\mathrm{kW} \times 0.003412142\end{equation}

Symbols

\(P_\mathrm{MMBtu/hr}\)	Power in MMBtu/hr \([\unit{ \mega\btu\per\hour}]\)
\(P_\mathrm{kW}\)	Power in kilowatts \([\unit{ \kilo\watt}]\)

Parameters

[in] kw Power in kilowatts (kW) \([\unit{\kilo\watt}]\)

Returns: Power in MMBtu/hr \([\unit{\mega\btu\per\hour}]\)

Definition at line 261 of file constants.h.

◆ mmbtuPerHrToKW()

constexpr double physics::conversions::mmbtuPerHrToKW ( double mmbtu_per_hr )

constexpr

1 MMBtu/hr = 293.07107 kW.

Relation: \begin{equation}\label{eq:mmbtu-per-hr-to-kw} P_\mathrm{kW} = P_\mathrm{MMBtu/hr} \times 293.07107\end{equation}

Symbols

\(P_\mathrm{kW}\)	Power in kilowatts \([\unit{ \kilo\watt}]\)
\(P_\mathrm{MMBtu/hr}\)	Power in MMBtu/hr \([\unit{ \mega\btu\per\hour}]\)

Parameters

[in] mmbtu_per_hr Power in MMBtu/hr \([\unit{\mega\btu\per\hour}]\)

Returns: Power in kilowatts (kW) \([\unit{\kilo\watt}]\)

Definition at line 243 of file constants.h.

Variable Documentation

◆ kBtuPerLbFToKJPerKgK

constexpr double physics::conversions::kBtuPerLbFToKJPerKgK = 4.1868

inlineconstexpr

1 Btu/(lb·°F) = 4.1868 kJ/(kg·K)

Definition at line 134 of file constants.h.

◆ kBtuPerTonRefrigeration

constexpr double physics::conversions::kBtuPerTonRefrigeration = 12000.0

constexpr

Used for refrigeration capacity calculations. Source: ASHRAE Handbook.

Definition at line 225 of file constants.h.

◆ kFahrenheitToRankineOffset

constexpr double physics::conversions::kFahrenheitToRankineOffset = 459.67

inlineconstexpr

Definition at line 153 of file constants.h.

◆ kHoursPerDay

constexpr double physics::conversions::kHoursPerDay = 24.0

inlineconstexpr

Definition at line 156 of file constants.h.

◆ kKgPerM3ToLbPerGal

constexpr double physics::conversions::kKgPerM3ToLbPerGal = 0.0083454

inlineconstexpr

Multiplies water density in kg/m^3 to obtain lb/gal. Source: NIST, CRC Handbook of Chemistry and Physics.

Definition at line 172 of file constants.h.

◆ kKilowattToBtuPerHour

constexpr double physics::conversions::kKilowattToBtuPerHour = 3412.136247820839

inlineconstexpr

Source: NIST, Perry's Chemical Engineers' Handbook

Definition at line 165 of file constants.h.

◆ kLbPerFt3ToKgPerM3

constexpr double physics::conversions::kLbPerFt3ToKgPerM3 = 16.018463

inlineconstexpr

Use this to convert a mass density from lb/ft^3 to kg/m^3.

Definition at line 218 of file constants.h.

◆ kMinutesPerHour

constexpr double physics::conversions::kMinutesPerHour = 60.0

inlineconstexpr

Definition at line 159 of file constants.h.

◆ kMMBtuToBtu

constexpr double physics::conversions::kMMBtuToBtu = 1'000'000.0

inlineconstexpr

Definition at line 211 of file constants.h.

Functions

Variables

Function Documentation

◆ fahrenheitToCelsius()

◆ fahrenheitToKelvin()

◆ fahrenheitToRankine()

◆ kWToMMBtuPerHr()

◆ mmbtuPerHrToKW()

Variable Documentation

◆ kBtuPerLbFToKJPerKgK

◆ kBtuPerTonRefrigeration

◆ kFahrenheitToRankineOffset

◆ kHoursPerDay

◆ kKgPerM3ToLbPerGal

◆ kKilowattToBtuPerHour

◆ kLbPerFt3ToKgPerM3

◆ kMinutesPerHour

◆ kMMBtuToBtu