If you change the entered values after you have performed a calculation, you must press the "Calculate" button to update the resultsBelow you can see an overview of the values you need to enter to make a calculation.

Ambient temperature:

This is the average temperature in the room or location where the pipes/ducts are installed.

Media temperature:

It is the temperature of the gas or liquid transported in the pipes. All calculations of ventilation ducts assume that the medium is air.

Diameter of media pipe:

This is the outside diameter of the pipe or duct without insulation. All calculations assume that the wall thickness of the pipes/ducts is “small” in relation to the diameter.

Orientation:

Under Orientation, you must select whether the pipes are installed horizontally or vertically. The orientation of the pipes/ducts is used to calculate the external transition coefficient.

Dan-iso product:

Here you can choose between the different insulation products that Dan-iso offers. You can choose between polyurethane insulation (PUR) in different densities and polyisocyanurate insulation (PIR).

You can read more about our products here: Dan-iso Products

Outer surface of insulation:

Here you can select the external surface covering of the insulation shell. The surface is important in relation to the calculations, as different surfaces have different emissivities, that is, they radiate, and thus lose, heat at different rates. The menu contains values for all standard coverings for Dan-iso insulation products.

Installation location:

Here you can choose whether the installation is located indoors or outdoors. This has an impact on whether the installation is expected to be exposed to forced convection due to wind. If you select “Outdoor” as the location, you must also enter the average wind speed in m/sFor installations located indoors, a wind speed of 0 m/sIf pipes/ducts are located indoors, the pipe's own convection is taken into account.

Results:

The calculator indicates the minimum insulation thickness required in mm to comply with the insulation class with the selected Dan-iso product. Note that the program is set to indicate a minimum thickness of 15mm, as thinner shells are difficult to handle during installation. Below the result for the thickness, it is possible to see the required U-value for the selected class.