H+H Calculated Ψ-values - 3rd issue (Revision B)

As you have registered in the past for our H+H Calculated Ψ-values, we thought you would like to know that the 3rd issue (Revision B) is now available for download from our website and directly from the link below. 

We have taken the opportunity to include an additional 2000 junctions, bringing the total to over 5,300. This version now includes:

• Full fill rigid insulation options with thermal conductivities of 0.019, 0.022 and 0.030W/mK for 100, 125 and 150mm cavities. All insulation thicknesses assumed 10mm less than the cavity they are built in to provide a residual 10mm air gap.
• New 0.019W/mK conductivity partial fill insulation options added for 100, 125 and 150mm cavities.  0.018W/mK options have been retained in the tables for reference.

Having carried out extensive comparison calculations, we can also confirm that it is now permissible to interpolate between insulation thermal conductivities within the same Summary table for a given junction. This will allow for thermal conductivities other than those listed. Interpolation across different tables is not permitted due to changes in material thickness affecting the geometry of the modelled junction.

Other than the addition of the new values (and layout changes to the Junction Summary tables to accommodate them), there are no other changes to the Ψ-values given in the previous 2nd Issue (Revision A).

There have also been some minor changes to the Introduction text and updates to the Checklists to accommodate the above.

Further details of complete changes may be found under Revision Notes on page 2 of the document.

Please feel free to let us know if you are no longer interested in H+H Calculated Ψ-values or if you would like to unsubscribe from our database.