Conduction Time Series

The Materials Manager Conduction and CTS > Show CTS opens Conduction Time Series. It is used to review conduction time series (CTS) values for selected constructions. The interactive CTS graph displays the values when the pointer is positioned over the plotted points.

Conduction time series is a series of conduction time factors for a construction over a 24 hour period. OpenBuildings Energy Simulator derives construction CTS graphs based upon the thermal properties of each material type that makes up the construction.

Heat gains from exterior surfaces is affected by the rate of conductive heat transfer through them. In order to determine this rate, OpenBuildings Energy Simulator uses conduction time series (CTS) values. Each exterior construction has 24 different CTS percentage values, summing to 100%, that indicate how much of the heat stored in the envelope has come through after a given amount of time.

Setting	Description
CTS Graph	CTS graph values are derived through a complicated process that examines the material properties that make up each construction. For the purposes of cooling, the U-value of a construction is also used (for heating, only the U-value is used and not CTS values). The weight of a construction (also derived from material properties) also plays a role in determining the thermal storage characteristics of a space. To view CTS data, position the pointer over one of the plotted points on the CTS graph. A pop up dialog appears displaying the data. Also, when a data point is displayed, two perpendicular reference extension lines are drawn on the graph from the point to the Hour and Conduction (%) axes. Inside/Outside – Displays which graph type the selected point belongs to. Hour – Displays the hour for the selected point's data. Conduction (%) – Displays the conduction time series percentage for the selected time period. Legend — The CTS graph legend display highlights when a plotted point is selected. I You can also click the legend item to highlight the corresponding CTS graph.
Up	Used to update the CTS graph with upward flow heat transfer data.
Horizontal	Used to update the CTS graph with horizontal flow heat transfer data.
Down	Used to update the CTS graph with downward flow heat transfer data.