[Trace-users] Multiple Air Handlers

Thu Nov 10 14:50:56 PST 2011

How do I model (for LEED) the fan power of the proposed design of a building that has 3 large air handlers (145,000 cfm each) all looping together?  Do I put the combined HP of (180*3=540) 540 HP?

-Jason

From: trace-users-bounces at lists.onebuilding.org [mailto:trace-users-bounces at lists.onebuilding.org] On Behalf Of Hintz, Scott Fredrick. (KSC-ISC-4011)[URS Federal Technical Services, Inc.]
Sent: Tuesday, November 01, 2011 5:54 AM
To: trace-users at lists.onebuilding.org
Subject: Re: [Trace-users] Max Room dry bulb to high

Leandro,

Also make sure your internal loads are not using the "Cooling Only - Design" schedule as this will result in people, lights, and misc loads being in spaces 24 hours a day, 7 days a week. Combine this with systems and ventilation you may schedule off at night and you may see space temperatures rise.

Scott

-----Original Message-----
From: Bob Vogt [mailto:BVogt at luckett-farley.com]
Sent: Monday, October 31, 2011 7:39 AM
To: trace-users at lists.onebuilding.org
Subject: Re: [Trace-users] Max Room dry bulb to high

Leandro,

The problem could be the system type. If you are using a single zone (SZ) type system, Trace will use the heating supply air dry bulb from the worst case room. You can identify the room by temporarily changing the system to terminal reheat (TRH)and find the room with the high supply air temperature. Sometimes it could be janitor closet or other space with low cooling air flow but higher heating loads. Increase air flow or review the results to adjust your heating supply air temperature.

Bob

-----Original Message-----

From: trace-users-bounces at lists.onebuilding.org [mailto:trace-users-bounces at lists.onebuilding.org] On Behalf Of trace-users-request at lists.onebuilding.org

Sent: Friday, October 28, 2011 4:39 PM

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Today's Topics:

   1. Max Room dry bulb to high (Leandro Lopes)

   2. Re: Max Room dry bulb to high (Scott Parker)

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Message: 1

Date: Fri, 28 Oct 2011 08:50:05 +0100

From: Leandro Lopes <o.leandro.lopes at gmail.com>

To: trace-users at lists.onebuilding.org

Subject: [Trace-users] Max Room dry bulb to high

Message-ID:

      <CADyL48ZLo7xJU+9Up9H-wcKi+3KcTRn3Puwu0zEqoM8PyPuwtw at mail.gmail.com>

Content-Type: text/plain; charset="windows-1252"

Hello,

I'm having trouble understanding why my temperatures in winter are so high.What happens, is that they start at 20?C and go up to 55 ?C ( It?s crazy).

My system consists in heating during winter months (no cooling available), and cooling in summer period.

Can someone help me, how can i control my temperature to 20?C in Winter period.

Could this happen because of the internal loads...

Best regards,

--

Atenciosamente:

Eng?: Leandro Lopes

*Tel: **965771706*

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Message: 2

Date: Fri, 28 Oct 2011 07:51:23 -0500

From: Scott Parker <sparker at aeieng.com>

To: Leandro Lopes <o.leandro.lopes at gmail.com>,

      "trace-users at lists.onebuilding.org"

      <trace-users at lists.onebuilding.org>

Subject: Re: [Trace-users] Max Room dry bulb to high

Message-ID:

      <23DA30AA4022B04FB78CB655A32EF12C09ADFC78 at aei-exswing.aeieng.lan>

Content-Type: text/plain; charset="iso-8859-1"

Leandro,

Not sure the problem, but since you alluded to high internal load I would check the following:

1. Do you have correct units for internal load (e.g. W/sq meter versus W)?

2. Are you using a thermostat schedule that may have a mistake in it?

3. Have you set the airflow to the space rather than allowing TRACE to calculate it?

4. Have you scheduled the cooling coil off during winter?

Regards,

Scott

From: trace-users-bounces at lists.onebuilding.org [mailto:trace-users-bounces at lists.onebuilding.org] On Behalf Of Leandro Lopes

Sent: Friday, October 28, 2011 3:50 AM

To: trace-users at lists.onebuilding.org

Subject: [Trace-users] Max Room dry bulb to high

Hello,