[Hap-users] Constant Air Flow

[C. J. Gann]

Matt,

Am not sure what kind of system you are sizing, CAV reheat or VAV,  
however HAP will size the reheat coil to provide reheat of the supply  
air at your min setting (2 ACH) which you have set to 55F plus any  
additional heat needed to warm the zone to 57F (60-3), which is  
heating Tstat - throttling range. The "zone sizing summary" report  
will indicate the reheat coil load. Given that you have such low Tstat  
setpoint there may be very little zone heat required. Hope this helps.

BTW, you should just call Carrier software support with questions as  
this is free provided you have a license. 800-253-1794.

-Craig

Sent from my iPhone

On Mar 17, 2010, at 10:09 PM, "Kimball, Matthew" <Matthew.Kimball at jacobs.com 
 > wrote:

> I am not looking for HAP to size, I just want to know the btu output  
> from the coils.  It gave me preheat coil btu's and cooling coil  
> btu's, but not reheat btu's.
> -----Original Message-----
> From: C. J. Gann [mailto:cjg04austin at swbell.net]
> Sent: Wed 3/17/2010 6:26 PM
> To: Kimball, Matthew
> Cc: <hap-users at lists.onebuilding.org>
> Subject: Re: [Hap-users] Constant Air Flow
>
> HAP will not size your reheat coil because you specified "user- 
> defined" sizing. Use computer sizing and it will size it.
>
> Regards,
>
> Craig J. Gann, P.E.; LEED AP
> www.EnergySimulators.com
>
> Sent from my iPhone
>
> On Mar 17, 2010, at 4:59 PM, "Kimball, Matthew" <Matthew.Kimball at jacobs.com 
> > wrote:
>
>> Anyone care to analyze what I am doing below and tell me why I'm  
>> not getting a terminal heating coil load when I run a simulation on  
>> the system?  Thanks,  Matt.
>>
>>
>> <Outlook.jpg><Outlook.jpg>
>> <Outlook.jpg><Outlook.jpg>
>> <Outlook.jpg><Outlook.jpg>
>>
>> <Outlook.jpg><Outlook.jpg>
>> <Outlook.jpg>
>> From: Brendan Arnold [mailto:BrendanA at MKE-Inc.com]
>> Sent: Tuesday, March 16, 2010 12:58 PM
>> To: Kimball, Matthew; hap-users at lists.onebuilding.org
>> Subject: RE: [Hap-users] Constant Air Flow
>>
>> You can specify a constant volume system under your "general" tap.  
>> Make sure if you are using chilled water select "Chilled Water Air  
>> Handling Units" under Equipment Type. Then select CAV single zone  
>> or terminal reheat (dependant on your situation) in the Air System  
>> Type.   Under the "sizing data" tap you can select "user define",  
>> then specify your supply air and ventilation CFM's.
>>
>> In order to determine cost for heating and cooling water you will  
>> need to construct a building to be simulated.  Thus you will need  
>> to create a chiller and boiler plant and specify all pump  
>> requirements.  Then implement these into your building.
>>
>>
>> Brendan
>>
>> From: hap-users-bounces at lists.onebuilding.org [mailto:hap-users- 
>> bounces at lists.onebuilding.org] On Behalf Of Kimball, Matthew
>> Sent: Tuesday, March 16, 2010 9:12 AM
>> To: hap-users at lists.onebuilding.org
>> Subject: [Hap-users] Constant Air Flow
>>
>> Is there a way to force HAP to supply a constant air flow through a  
>> "system"  (this includes specifying return air and outside air  
>> requirements) and calculate the cost of providing the cooling and  
>> heating water to the "system" and "zone" reheats?  Any explanations  
>> would be helpful.
>>
>> Thanks,
>>
>> <New Logo.jpg>
>>
>> Matthew Kimball
>> **LEED Green Associate
>> Piping Designer II
>> Jacobs Engineering Raleigh
>> 110 Corning Rd. Suite 2500
>> Cary, NC  27518
>> 919-859-5019 office
>> 574-265-3193 cell
>> 919-859-5151 fax
>>
>>
>>
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