[Hap-users] Manipulating HAP

Thu Sep 8 12:00:59 PDT 2016

Well the equation is Q=1.085*CFM*ΔT so it is dependent more on your return/mixed air temperature (which is based on your design temps obviously) you can solve for one ton of load based on your conditions. But you have to start with an assumed mixed air temp and work your psych chart to determine if you are also meeting the latent load. To answer your other question we simply do not input any ventilation information, so zeroed out. And if you look at the room reports there is no ventilation load listed under the rooms itself that's why we ended up using those reports they are strictly that, room loads.

Thank You,
Matthew J. Baron, PE

[cid:image003.jpg at 01D209E1.CE564EA0]

Wendel, Centerpointe Corporate Park, 375 Essjay Road, Suite 200, Williamsville, NY 14221
p. 716.688.0766   tf. 877.293.6335   e. mbaron at wendelcompanies.com<mailto:mbaron at wendelcompanies.com>   w. wendelcompanies.com<http://www.wendelcompanies.com/>

architecture  |  engineering  |  planning  |  energy efficiency  |  construction management

CONFIDENTIALITY NOTICE: This email transmission is confidential and is intended only for the person(s) named above.  Any distribution, copying or disclosure of this email is strictly prohibited.

From: Trevis Cardinez [mailto:engineer2 at welchmorris.com]
Sent: Thursday, September 08, 2016 2:47 PM
To: Matthew J. Baron <mbaron at wendelcompanies.com>
Subject: RE: [Hap-users] Manipulating HAP

Well yea its really high due to the fact that the building was mostly glass and in our weather conditions, this would produce alot of sensible heat load. This hence will cause the high required cfm since the cfm is directly proportional to the sensible heat....E=mcΔT. What I am curious off though, is what method you used to remove the ventilation load? Did you make the OA requirements in the spaces zero or you had an alternative means via the systems tab?

Trevis Cardinez
Mechanical Engineer
Welch, Morris + Associates Ltd.
Athelstane Building,
59 Chacon Street,
San Fernando.
Tel: 1-868-657-0183/657-0582
Fax:1-868-653-2381
Mobile: 1-868-373-4935
Email: engineer2 at welchmorris.com<mailto:engineer2 at welchmorris.com>
Website: www.welchmorris.com<http://www.welchmorris.com>

This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify the system manager at Welch Morris and Associates. This message contains confidential information and is intended only for the individual named. If you are not the named addressee you should not disseminate, distribute or copy this e-mail. Please notify the sender immediately by e-mail if you have received this e-mail by mistake and delete this e-mail from your system. If you are not the intended recipient you are notified that disclosing, copying, distributing or taking any action in reliance on the contents of this information is strictly prohibited.

From: Matthew J. Baron [mailto:mbaron at wendelcompanies.com]
Sent: Thursday, 08 September 2016 02:30 PM
To: Trevis Cardinez
Subject: RE: [Hap-users] Manipulating HAP

We ran into a similar issue when first utilizing HAP, our solution has been to use the room load reports and totalize the sensible and latent room load without entering the ventilation information in HAP then we use a spreadsheet to the determine the additional ventilation load based on enthalpy. We have also in the past, when the cfm requirement was less stringent, given the OA cfm requirements and space load data to an equipment vendor along with design conditions for return and outdoor air and let them determine the overall cfm. Our typical number we see is 350 to 400 cfm/ton of total load. If you are at 550 cfm /ton that seems unusually high.

Thank You,
Matthew J. Baron, PE

[cid:image004.jpg at 01D209E0.FED482F0]

Wendel, Centerpointe Corporate Park, 375 Essjay Road, Suite 200, Williamsville, NY 14221
p. 716.688.0766   tf. 877.293.6335   e. mbaron at wendelcompanies.com<mailto:mbaron at wendelcompanies.com>   w. wendelcompanies.com<http://www.wendelcompanies.com/>

architecture  |  engineering  |  planning  |  energy efficiency  |  construction management

CONFIDENTIALITY NOTICE: This email transmission is confidential and is intended only for the person(s) named above.  Any distribution, copying or disclosure of this email is strictly prohibited.

From: Hap-users [mailto:hap-users-bounces at lists.onebuilding.org] On Behalf Of Trevis Cardinez via Hap-users
Sent: Thursday, September 08, 2016 11:37 AM
To: hap-users at lists.onebuilding.org<mailto:hap-users at lists.onebuilding.org>
Subject: [Hap-users] Manipulating HAP

So I got an issue where my cooling load requirement was roughly 12 tons while my airflow requirement was approx 6600 cfm. When searching for a packaged unit to serve this purpose, I saw a little problem getting a unit that's not too large and can satisfy the cfm requirement in particular. So my attempt now, is to split the room load and ventilation load, hence the cfm as well, and use two smaller units to meet my requirements. My question now is how do I model HAP to obtain my room load only? Do I need to take of the OA requirements in the space itself or I can do something about it in the system itself?

Trevis Cardinez
Mechanical Engineer
Welch, Morris + Associates Ltd.
Athelstane Building,
59 Chacon Street,
San Fernando.
Tel: 1-868-657-0183/657-0582
Fax:1-868-653-2381
Mobile: 1-868-373-4935
Email: engineer2 at welchmorris.com<mailto:engineer2 at welchmorris.com>
Website: www.welchmorris.com<http://www.welchmorris.com>

This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify the system manager at Welch Morris and Associates. This message contains confidential information and is intended only for the individual named. If you are not the named addressee you should not disseminate, distribute or copy this e-mail. Please notify the sender immediately by e-mail if you have received this e-mail by mistake and delete this e-mail from your system. If you are not the intended recipient you are notified that disclosing, copying, distributing or taking any action in reliance on the contents of this information is strictly prohibited.

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