Calculator FAQ

This module helps you calculate energy losses in uninsulated pipe and air duct installations, as well as the energy savings you achieve by insulating them.

All calculations require that you enter all parameters before you can perform the calculation. The calculations are divided into an “Uninsulated” and an “Insulated” part. You must first enter and calculate the installation in the uninsulated state before you can enter data for the insulated installation. 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.

 

Uninsulated installation

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.

 

Surface of media pipe:

Here you can select the external surface coating of the service pipe. The surface is important in relation to the calculations, as different surfaces have different emissivities, i.e. they radiate, and thus lose heat at different rates. The menu contains values for the emissivity of typical materials for service pipes according to DS/EN ISO 12240.

 

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.

 

Isolated installation

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

 

Insulation thickness:

Here you can enter the thickness of the insulation. Dan-iso offers a range of standard thicknesses as well as customized thicknesses to suit your specific needs.

 

Outer surface of insulation:

Here you can select the external surface coating 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 coatings for Dan-iso insulation products.

 

Especially for air ducts:

In contrast to calculations for pipes, air ducts are calculated with an internal heat transfer coefficient different from 0 (according to DS/EN ISO 12240:2008, section 4.1.3.2.1 ). This means that when calculating ducts you must also specify the “flow”, i.e. the speed of the air flowing through the duct. The value is specified in m/s.

 

Results:

The calculator indicates the energy loss per meter in W/m and the total energy loss in the installation in W. You can see results for the installation in both the uninsulated and insulated state. Furthermore, the calculator indicates the difference between the two states as the resulting energy saving in W.

This module helps you find the necessary insulation thickness to comply with certain classes.

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.

 

Responsibility:

Since the user's application method in individual cases is beyond our control, Dan-iso A/S cannot assume responsibility for the results obtained if the user has not obtained and received our confirmation that the calculations are suitable for the specific purpose. The right to make changes is reserved.