[Hap-users] Hap-users Digest, Vol 53, Issue 3

[Aaron Smith]

Danny,

I'd recommend contacting Carrier software support - I find them to be pretty
helpful.

That being said, I don't think HAP can model wrap-around coils and it can't
model outdoor air from another system.  Here are my suggestions but they may
not be of much help:

As a work-around to allow you to model the rooftop AHU conditioning outdoor
air, you could model the floor level AHUs without any outdoor air (in each
space, select OA ventilation requirements as "user defined" then enter "0").
Then model a separate AHU with all of the building's outdoor air (you'll
need to create a dummy space for it and enter all of the building's outdoor
airflow into this space).  This may work ok if you are supplying neutral
temperature outdoor air to the floors but if not; you'll probably want to
incorporate the rooftop AHU fan power and coil capacities into the floor
AHUs.  

As for the free reheat you are getting from the wrap around coil, I see that
v4.9 has a heat recovery chiller - that may be the best way to simulate it.
I haven't installed v4.9 yet so I'm not familiar with how that works but I
don't think you would want to have that chiller serve the floor level AHUs
as it would make too much free heat recovery available to the whole building
- you probably only want to use this if you choose to model a separate
rooftop AHU as you could have your heat recovery chiller only serve that
AHU.

Aaron

Aaron Smith, P.Eng 
M&R Engineering 

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Today's Topics:

   1. Modeling Pre-cooled Ventilation Air (Daniel Lim)


----------------------------------------------------------------------

Message: 1
Date: Sun, 14 Dec 2014 14:41:52 +0000 (UTC)
From: Daniel Lim <dannyllim at yahoo.com>
To: "hap-users at lists.onebuilding.org"
	<hap-users at lists.onebuilding.org>
Subject: [Hap-users] Modeling Pre-cooled Ventilation Air
Message-ID:
	
<1464281635.275591.1418568112617.JavaMail.yahoo at jws10045.mail.ne1.yahoo.com>
	
Content-Type: text/plain; charset="utf-8"

I am new to HAP and would appreciate advice or guidance from the HAP-user
forum. I am modeling floor level AHUs receiving pre-cooled fresh air from
rooftop pre-cooling AHU equipped with wrap around??heat pipe (AHU cooling
coil between heat pipe cooling section and heating section) to remove
moisture. I am using HAP 4.9 and the closest I can find to start with is the
CAV Tempering Ventilation system but can't figure out how to make it feed
the floor level AHUs. Can this configuration be implemented in HAP? Thanks
in advance for any guidance.
Danny Lim??
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