
Air Cavity Calculator (Tool)The Air Cavity Calculator is used as a tool for rapid calculation of equivalent heat conductivity of small air cavities and air gaps based on the input of their dimensions and heat stream direction. To calculate equivalent heat conductivity (lambda) the application uses formulas defining calculation of heat transfer resistance of air spaces described in EN ISO 6946:2005 Appendix B  please be aware of limitations related to its application (e.g. small, closed air cavities).
Remark: According to normative regulations one shall set the temperature difference, if exact value is not known, accordingly. Buttons "5K (EN 6946)" and "10K (EN 10077) set this value to one of magnitudes required in these respective regulations. For the very usual case of non rectangular air cavities normative regulations define following procedure to account for: An equivalent conductivity is to be calculated for a fictive rectangular cavity. Such fictive cavity shall be constructed as follows:
The conductivity calculated for such fictive rectangular cavity is the used instead for the (non rectangular) original air cavity.
Remark: For this procedure the most sophisticated it is to calculate the real are of the non rectangular cavity itself. Remark: The exact direction of stream flow is known in advance within multi dimensional calculations. This means, that the requirement to decide the correct choice of the "width" and "thickness" for the cavity cannot be fulfilled easily. It is user's decision to estimate the right heat stream direction by some heuristics based on his experience („along the x or yaxis“). Order OnlineOrder the software licenses online via secure and rapid electronic procedure. The pages of CustomerCareCenters shall give you answers to the online process. 