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VAV and Dual-Duct system calculations

VAV and Dual-Duct system calculations

VAV and Dual-Duct system calculations

(OP)
Could anyone give me some clues and rule of tumbs for VAV and Dual-duct hvac system design? Can you please specify where can I find comprehensive calculation details of how sizing cold and hot air ducts and selecting appropriate units for commercial and school applicatios using these type of systems?

thanks

RE: VAV and Dual-Duct system calculations

mitcham,
Do you have access to a set of ASHRAE manuals?   If not, try starting here:
                http://www.ashrae.org/

RE: VAV and Dual-Duct system calculations

Why do you want to go dual duct? This waste energy because of simultaneous heating & cooling. Also the system uses more space & more ductwork. Go VAV instead. You may need reheat (for heating loads & to avoid dumping at diffusers) but this would be at the VAV box minimum volume.

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