CIBSE AM10 Flow Chart (Figure 2.8)

Oi Vitor,

Figure 2.8 is a chart that will help designers to decide whether natural ventilation only is suitable for the building they are designing.

It starts with the following question:
Are max heat gains ore than 30-40 Wm2?
If you decide the appropriate answer is YES, the next question is whether you can lower the heat gains, if a building heat gains are not low enough you will need either mixed mode ventilation or full air conditioning.
If you go for NO, you will be asked if the plan is narrow or if you can use courtyards, if YES, you will be asked if occupants can adapt to weather changes, if YES, natural ventilation only is acceptable for your building.

The other "answers" you might find on the end of the chart are mechanical ventilation, mechanical ventilation and humidification, comfort cooling, in addition to full air conditioning and mixed mode ventilation explained earlier.

I hope this helps.

Hi Dionisio Franca,

With respect to the above post, I would like to clarify Max Heat gain calculation.

What are the factors need to be included while calculating max heat gain?

Is that like heat load calculation?

Please clarify.

Thanks.

Hi Praveen,

yes, max heat gain is required for you to check if the building usage and the local climate let you use natural ventilation. If you are located on a region that is too hot or too cold, you need mechanical conditioning and therefore natural ventilation will not be a good fit for your project. You would need to check the CIBSE document to double check the formal definition however.