ALF Tools

Design guidelines

Increasing the south-facing window size often leads to increased net heat losses, whereas increasing north-facing windows may lead to net benefits. The net result depends on window type, shading, and other design factors.

Increased thermal mass leads to larger warm-up loads but also increases the usefulness of gains. The net result depends on other design factors such as amount of solar gains, insulation levels, climate, heating schedule and others.

Increasing insulation always reduces the heating energy required. Priorities for increasing insulation should be large areas with existing low insulation levels (i.e. windows).

Heating energy consumption is very sensitive to the selected heating schedule and heating level. It is recommended that the heating energy for different heating patterns be calculated to get a 'feel' for how realistic any calculated savings are considering the uncertainties in how the building will be heated by the occupants.

 Create an ALF account

Register now to create your free ALF account.

Every user needs to create an ALF account. Creating an ALF account will ensure:

  • Confidentiality for your project.
  • Allow BRANZ to record usage of the ALF tool – BRANZ cannot access any individual projects. Your privacy is assured.

 Contact and Feedback

Contact us at Branz for further information about the ALF 3.2: Annual Loss Factor.