Description
The Min. / Max. Temperature tool lets you calculate and display the minimum, maximum and average surface temperatures, and the condensation zone along a surface line. For the minimum surface temperature spot, the fRsi factor, the surface humidity at a given humidity, and the critical humidity (point at which surface condensation forms, and/or at which predefined surface humidity is reached along with the temperature factor) are additionally calculated.
How do I activate it?
The Min. / Max. Temperature tool can be activate with the menu command Min./Max. Temperature in the menu Results or by clicking on the 
icon in the Toolbox Flyout. When the tool is active, the mouse becomes a 
in areas of possible start and endpoints.
The desired surface line is defined by entering a start and an endpoint:
Click on the boundary point, where the surface line should begin. The boundaries of the construction, which come into question for the definition of the surface line, will appear as a dashed line. Move the mouse to the desired endpoint. The dashed line now highlights those parts, for which the minimum, average, and maximum surface temperature and the fRsi factor, the condensation zone, the surface temperature, and critical room humidities for the minimum temperature is calculated and shown. The surface line is defined as soon as you click on the endpoint.
If the start and endpoints lie on the exterior boundary of a construction, then flixo calculates the minimum and, optionally, the maximum surface temperature (cf. Min./Max. Temperature Style dialog window on the Extended tab) along with the critical room humidity for the line segment, which leads counterclockwise from the start to the endpoint; if the start and endpoint lie on an interior boundary (e.g. the interior boundary of an entire chimney), then the calculation for the line segment is a carried out clockwise.
The values of the minimum and maximum surface temperatures can be displayed at the corresponding positions, in addition with the minimum temperature spot, the fRsi factor, the surface humidity as well as the critical room humidity. The start and endpoint of the surface line segment will be labeled as well.
If you would like to interrupt the input process before defining the endpoint, then use the context menu command (right click) Cancel or hit the ESC key.
With the Edit tool you can change the position of the label along with the start and endpoints.
The style of the label (e.g. the number of post-decimal place holders, critical humidity, display of maximum temperatures, display of average temperatures), the optional display of condensation zones, the room humidity and the accepted room humidity, as well as the graphical properties of the label lines can all be changed through the corresponding Style im Styles Flyout.
Defining Styles
The presentation of a Min./Max. temperature object can be defined in the Style list of the Min./Max Temperature tool properties (see Figure 1). The list shows all styles for Min./Max. temperature objects that have previously been determined in the Styles Flyout.
A new Min./Max. temperature object will always be created with the styles currently marked in the Style drop down list. You can either change the selection of the styles in the Styles Flyout or in the Style drop down list from the Min./Max. Temperature tool properties.
The styles can be also be adjusted afterwards by using the Assign properties tool or by using the Drag&Drop function (see Tutorial 1).
Figure 1: Min./Max. Temperature tool properties
In addition to the minimum temperature, the temperature factor, the surface humidity and the two critical room humidities can be displayed (cf. Figure 2):
Temperature factor fRsi is calculated according to the following formula:
And the temperature factor fRsi* for problems with more than 2 boundary condition temperatures is calculated according to the following formula:
where:
θsi min: calculated minimum surface temperature according to the defined surface line segment [°C]
θi: interior boundary condition temperature [°C]
θe: exterior boundary condition temperature [°C]
θe min: lowest exterior boundary condition temperature [°C]
Surface humidity ϕsi(*%) In parentheses, the set room humidity of the bordering room is shown. You can define this value in the Min. / Max. Temperature Style dialog window. The surface humidity is dependent on the chosen interior temperature and room humidity. Thus, the surface humidity must be respectively calculated for different interior temperatures and room humidities.
Room humidityϕ100%, is shown where condensation forms at the minimum surface temperature spot. If the room humidity is as high or higher than the calculated room humidity ϕ100% (as in the example below 32%), then condensation forms at this spot. This value is dependent on the chosen interior temperature and thus, the room humidity, must respectively be calculated for different interior temperatures.
Room humidityϕ80%, is shown at the minimum surface temperature spot where the surface humidity is 80%. In the example below, there would be 80% humidity at that minimum surface temperature spot with same boundary conditions and a 26% room humidity. This value is dependent on the chosen interior temperature and thus, the room humidity, must respectively be calculated for different interior temperatures.
The critical surface humidity (e.g. to analyse a potential mildew problem) can be adjusted in the Min./Max.Temperature Style dialog window in the Styles Flyout.
| • | The Min./Max. temperature tool can only be used on report pages, and only if a calculated model result object is present. |
| • | The start and endpoints of the border line or the surface must be on the surface of the construction. |
| • | The start and endpoints of the border line or the surface line must be able to be joined by a line. |
| • | The critical room humidities and the surface humidity are only shown if the minimum temperature point is on a boundary segment with a temperature/h-value boundary condition, and the minimum temperature is lower than the adjacent room temperature. |
| • | The temperature factor fRsi is only shown if there are exactly two boundary conditions in the model, and the minimum temperature is lower than the adjacent room temperature. |
| • | The temperature factor fRsi* is shown if there are more than two boundary conditions in the model, and the minimum temperature is lower than the adjacent room temperature. In general, the temperature factor fRsi*cannot be used for other boundary condition temperatures. |
Url: http://www.infomind.ch/bph/en/flixo/help/version5/index.html?tools_minmaxtemp.htm
