A Construction is a combination of layers, such as a wall or a roof.
Supported Attributes:
| Attribute | Description |
|---|---|
| Id | Unique identifier for the layer. Normally prefixed with mat-. |
Supported Children:
| Element | Description |
|---|---|
| Name | |
| R-value | A measure of the thermal resistance (or resistance to heat loss) through a material layer of a given thickness. R-value = Thickness / Conductivity.
Note: In cases where a specific material layer relates to an air gap, a material of non-uniform thickness (such as metal decking or an I beam) or combination of materials (such as a metal stud partition - air and steel) manual adjustments to layer thickness and/or thermal conductivity is required in order for the R-value to be calculated correctly. This is not to be confused with the R-value for an entire wall, floor, or roof element which is the sum of the resistances of each material layer that makes up each element.
|
| Thickness | The distance across which heat loss occurs through a material. In most cases, this will be the face to face dimension of each material layer. The thickness of a material divided by its conductivity determines the resistance or R-value of that material. |
| Conductivity | A measure of a materials ability to conduct heat. |
| Density | A measure of a materials mass per unit volume. |
| Specific Heat | A measure of the amount of heat required to heat an object per unit mass by one degree (°C/°F). |
Sample:
<Material id="mat-348">
<Name>CMU LW 12in ConcFill (CB57)</Name>
<Description>Concrete Filled 30.5 cm</Description>
<R-value unit="SquareMeterKPerW">2.38</R-value>
<Thickness unit="Meters">0.304785</Thickness>
<Conductivity unit="WPerMeterK">0.725870</Conductivity>
<Density unit="KgPerCubicM">1810.260000</Density>
<SpecificHeat unit="JPerKgK">837.360000</SpecificHeat>
</Material>