Hello,
When I choose VAV system type in HAP, I get 3 options which are VAV, 1 Fan Dual Duct VAV and 2 Fan Dual Duct VAV.
I want to design a VAV system but with central cooling AND heating. When I use VAV, it doesn't give me the option to use central heating and I'm forced to use a VAV box with reheat instead. Is there any work around this?
Can I add the total of the terminal heating coil for each zone and just place a central heating coil with the same amount?
Thanks in advance.
Admed,
The option isn't there for VAV because you typically don't want to have
central heating from a single duct VAV system - if you did you would lose
the option of providing simultaneous cooling in some zones and heating in
others. If you didn't plan on having simultaneous heating and cooling,
there is a type of system called VVT (Variable Volume and Temperature) which
switches back and forth, I think they are only used on smaller projects
because you sacrifice a level of comfort.
I think a more common type of system today would be a true VAV system with a
separate perimeter heating system either through baseboard heaters or
fan-powered boxes these options are available when VAV is selected.
Regards,
Aaron
Aaron Smith, P.Eng
M&R Engineering