CSE User's Manual

California Simulation Engine


MATERIAL constructs an object of class MATERIAL that represents a building material or component for later reference a from LAYER (see below). A MATERIAL so defined need not be referenced. MATERIAL properties are defined in a consistent set of units (all lengths in feet), which in some cases differs from units used in tabulated data. Note that the convective and air film resistances for the inside wall surface is defined within the SURFACE statements related to conductances.


Name of material being defined; follows the word “MATERIAL”.

UnitsLegal RangeDefaultRequiredVariability
63 charactersnoneYesconstant


Thickness of material. If specified, matThk indicates the discreet thickness of a component as used in construction assemblies. If omitted, matThk indicates that the material can be used in any thickness; the thickness is then specified in each LAYER using the material (see below).

UnitsLegal RangeDefaultRequiredVariability
ftx \(>\) 0noneNoconstant


Conductivity of material. Note that conductivity is always stated for a 1 foot thickness, even when matThk is specified; if the conductance is known for a specific thickness, an expression can be used to derive matCond.

UnitsLegal RangeDefaultRequired**Variability
Btuh-ft/ft2-oFx \(>\) 0noneYesconstant


Temperature at which matCond is rated. See matCondCT (next).

UnitsLegal RangeDefaultRequiredVariability
oFx \(>\) 070 oFNoconstant


Coefficient for temperature adjustment of matCond in the forward difference surface conduction model. Each hour (not subhour), the conductivity of layers using this material are adjusted as followslrCond = matCond * (1 + matCondCT*(Tlayer – matCondT))

UnitsLegal RangeDefaultRequiredVariability

Note: A typical value of matCondCT for fiberglass batt insulation is 0.00418 F-1


Specific heat of material.

UnitsLegal RangeDefaultRequiredVariability
Btu/lb-oFx \(\ge\) 00 (thermally massless)Noconstant


Density of material.

UnitsLegal RangeDefaultRequiredVariability
lb/ft3x \(\ge\) 00 (massless)Noconstant


Nominal R-value per foot of material. Appropriate for insulation materials only and used for documentation only. If specified, the current material is taken to have a nominal R-value that contributes to the reported nominal R-value for a construction. As with matCond, matRNom is always stated for a 1 foot thickness, even when matThk is specified; if the nominal R-value is known for a specific thickness, an expression can be used to derive matRNom.

UnitsLegal RangeDefaultRequiredVariability
ft2-oF/Btuhx \(>\) 0noneNoconstant


Optional to indicate the end of the material. Alternatively, the end of the material definition can be indicated by “END” or simply by beginning another object.

UnitsLegal RangeDefaultRequiredVariability

Related Probes: