When you realise you must alter the configuration file in Revit 2024 to enable the Heating and Cooling Loads analyses, it does raise a few questions. I looked on the forums and there is not too much chatter around this.

However, when you discover the Ripple Engineering tools, then you are given the methodology and theory in much better detail than Autodesk has managed to achieve in the past.

Among my own Engineering friends, the Heating and Cooling loads analysis were sometimes calculated in external programs in which the spaces in Revit were exported as gbXML files for analysis. I do not know if that is the case globally.

Then a Dynamo graph was used to write the HAPS calculation results back into the spaces. Without the air supply values the modellers cannot place the diffusers and other equipment necessary to supply the spaces with the necessary heating or cooling. This also impact the development of the HVAC network.

If values are known for HVAC Zones, they can be used to model the largest ducts, but the details for the spaces/rooms will be missing until the airflow values have been calculated. At the very least, a first pass can be made during the development of the building until the models are finally ready for detailed Engineering analysis. The Revit Heating and Cooling Loads analysis tool can help with this.

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