Namespaces

For naming, follow the conventions of the Buildings.UsersGuide. Further details or deviations are explained below.

General

Class, instance and constant names may contain numbers.

Constant Names

Constant names, i.e., names of variables declared with the constant prefix, usually start with an upper case letter with only a few exceptions if this is common sense e.g. pi, cp.

Sensor Names

Sensors are named in the following format: Sen<Measurement><FlowDirection>. Measurement and flow direction are used as explained above. The resulting sensor names for instances of temperature sensors in both flow directions (supply and return) would be senTSup and senTRet

Frequently used strings

• Start variables: e.g. T_start, p_start ...
• Indices of ports: e.g. port_a, port_b, heatPort_x1, heatPort_x2, radiationPort_in, radiationPort_out ...
• Constant variables: e.g. x_const ...

Bus Connector

For further guidelines concerning expandable connectors refer to bus connector conventions.

Exceptions

The following table contains variable names that do not conform to the naming conventions in the Buildings.UsersGuide. A distinction is made between existing naming(s), for example due to old models, and desired naming as chosen exceptions from the convention. It is not (yet) a complete list of all exceptions to the naming conventions.

Meaning	Existing naming(s)	Desired naming	SI unit	Modelica type
Absolute humidity	X, hum	absHum	kg/kg	Modelica.Units.SI.MassFraction
Air path flow exponent	m		1	Real
Area	A, area	A	m2	Modelica.Units.SI.Area
Convective heat transfer coeff.	hCon	hCon	W/(m2.K)	Modelica.Units.SI.SurfaceCoefficientOfHeatTransfer
Current	I	I	A	Modelica.Units.SI.Current
Density	rho in .Movers but d in .Sensors and .Media	rho	kg/m3	Modelica.Units.SI.Density
Diameter	diameter, d, D, diam	d	m	Modelica.Units.SI.Diameter
Efficiency	eta, eff	eta	1	Modelica.Units.SI.Efficiency
Electrical resistance	R	R	Ohm	Modelica.Units.SI.Resistance * *
Heat capacity	C	C	J/K	Modelica.Units.SI.HeatCapacity
Heat conductivity	lambda, k	lambda	W/(m.K)	Modelica.Units.SI.ThermalConductivity
Height	height, h	height	m	Modelica.Units.SI.Length
Internal energy	U	U	J	Modelica.Units.SI.Energy
Kinematic viscosity	nu	nu	m2/s	Real
Latitude of the location	lat, Latitude, latitude	lat	deg	Modelica.Units.SI.Angle
Length	length	len	m	Modelica.Units.SI.Length
Longitude of the location	Longitude	lon	deg	BuildingSystems.Types.Angle_deg
Long-wave emittance	eps, a, emissivity	eps	1	Modelica.Units.SI.Emissivity
Mass	m	m	kg	Modelica.Units.SI.Mass
Number of something (1,2,3,...)	n, N	n	1	Real
Prandtl number	Pr	Pr	1	Modelica.Units.SI.PrandtlNumber
Relative humidity	relHum, phi	relHum	1	Real
Reynolds number	Re	Re	1	Modelica.Units.SI.ReynoldsNumber
Short-wave absorptance	solar_absorptance	solabs	1	BuildingSystems.Types.Absorptance
Solar irradiation	H, I	H	W/m2	Modelica.Units.SI.RadiantEnergyFluenceRate
Spec. heat capacity (const. p)	cp	cp	J/(kg.K)	Modelica.Units.SI.SpecificHeatCapacityAtConstantPressure
Specific enthalpy	h	h	J/kg	Modelica.Units.SI.SpecificEnthalpy
Specific heat capacity	c	c	J/(kg.K)	Modelica.Units.SI.SpecificHeatCapacity
Thermal conductance	UA, C	UA	W/K	Modelica.Units.SI.ThermalConductance
Thickness	thickness, d, s	s	m	Modelica.Units.SI.Thickness
Time	time	time	s	Modelica.Units.SI.Time
Transmittance	tau	tau	1	Real
Velocity	v, velocity	vel	m/s	Modelica.Units.SI.Velocity
Voltage	V	V	V	Modelica.Units.SI.Voltage
Volume	V, vol, volume	V	m3	Modelica.Units.SI.Volume
Width	width	width	m	Modelica.Units.SI.Length

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