QUESTION:

I want to add a constant airflow of 18.3 l/s, 16 degrees C into a room to see the resulting temperature. How do I do this in ECOTECT ?

ANSWER:

ECOTECT doesn't model mechanical systems in any detail so you can't simulate an air inlet, only infiltration and ventilation from outside. For what you're after it would be best to export from ECOTECT to EnergyPlus which does this very well.