[Hap-users] HAP VAV Heating question

Aaron Smith asmith at mreng.ca
Tue Nov 4 09:56:40 PST 2014


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.


Aaron Smith, P.Eng 
M&R Engineering 

-----Original Message-----
Date: Sun, 2 Nov 2014 09:51:18 +0200
From: Ahmed Kamel <ahmed_kamel99 at live.com>
To: "hap-users at lists.onebuilding.org"
	<hap-users at lists.onebuilding.org>
Subject: [Hap-users] HAP VAV Heating question
Message-ID: <DUB114-W69205398E7231430B46E56F7980 at phx.gbl>
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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.
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