[Equest-users] Oversized cooling

[Gonzalo Lema]

Hi Joe,
I also believe that the fan size is probably determined by the maximum heating, not the cooling, load. However, I don't understand why after determining the airflow, it doesn't adjust the cooling coil to have a similar capacity as the building HVAC maximum cooling load (SS-D report).
Would you like to see the input/output files?

Thanks for your help

SUMAC
Gonzalo Lema | Mechanical Engineer | LEED GA
Tel: +1.773.857.7906 Ext 7009 (Chicago, USA)
Tel: +1.305.814.8805 (Miami, USA)
Tel: +511.253.5355 (Lima, Perú)
Tel: +593.4.600.0613 (Guayaquil, Ecuador)
Tel: + 571.3151985 (Bogotá, Colombia)
glema at sumacinc.com<mailto:glema at sumacinc.com>
www.sumacinc.com<http://www.sumacinc.com/>

From: Equest-users [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Joe Huang
Sent: Wednesday, November 26, 2014 3:05 PM
To: equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] Oversized cooling

Without looking at the DOE-2.2 input and output files, it's difficult to give you a definitive answer, but from my experience explanations for such sizing questions can always be found with a little digging and understanding of how DOE-2 does autosizing.

When DOE-2 does autosizing, it takes the maximum loads reported from LOADS and calculates the equipment capacity (heating, cooling, and fan) needed to meet those loads. The fact that the building is in a cool climate (Colorado Springs) has  several implications on the sizing calculation - (1) fan size is probably determined by the maximum heating, not the cooling, load, (2) fan size will also be increased significantly (1.24) due to the altitude, (3) substantial difference between the peak cooling load from LOADS and SYSTEMS, since the former is derived at a constant reference temperature with no outside air, while the latter is derived at the actual zone temperature and with outside air (e.g., economizer running earlier in the day, etc.).   To trace these differences, compare the peak loads in the LOADS reports to those in the SYSTEM reports.

Joe

Joe Huang
White Box Technologies, Inc.
346 Rheem Blvd., Suite 205A
Moraga CA 94556
yjhuang at whiteboxtechnologies.com<mailto:yjhuang at whiteboxtechnologies.com>
http://weather.whiteboxtechnologies.com for simulation-ready weather data
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On 11/25/2014 11:18 AM, Sami, Vikram wrote:
Curious.

I do think the higher load seems to be more like what you should expect for a building this size (7501 kBTU/h = 625 tons. For a 102,000 ft2 building that's 163 ft2/ton). That might be slightly oversized for Ft Carson, although Colorado springs gets hot in the summer. Not sure what your building loads are, but 163 ft2/ton is not unheard of for a heavy use building. I would expect something more in the range of 250-300. So the question is why is the maximum cooling load reporting as only 927 kBTU/hr (77.25 tons = 1320 ft2/ton)

Just my two cents from looking at this for five minutes - I might be wrong.


Vikram Sami
BEMP, LEED BD+C
Associate Partner



ZGF ARCHITECTS LLP
T 206.521.3509 E vikram.sami at zgf.com<mailto:vikram.sami at zgf.com>
925 Fourth Avenue, Suite 2400
Seattle, WA 98104


From: Equest-users [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Gonzalo Lema
Sent: Monday, November 24, 2014 12:25 PM
To: equest-users at lists.onebuilding.org<mailto:equest-users at lists.onebuilding.org>
Subject: [Equest-users] Oversized cooling

Hi,

I have a problem with the cooling capacity. The Max cooling load is 927 kbtu/hr, but the cooling capacity is 7501 kbtu/h. I auto-sized the equipment (system and cooling coil) for 1.00, but I don't understand why the factor seems to be 8x.


[cid:image001.jpg at 01D00D49.337195C0]

[cid:image002.png at 01D00D49.337195C0]



The system fan Works in part-load 0-20% all the time:

[cid:image003.png at 01D00D49.337195C0]


Does anybody knows what could be causing this?

Thanks.

SUMAC
Gonzalo Lema | Mechanical Engineer | LEED GA
Tel: +1.773.857.7906 Ext 7009 (Chicago, USA)
Tel: +1.305.814.8805 (Miami, USA)
Tel: +511.253.5355 (Lima, Perú)
Tel: +593.4.600.0613 (Guayaquil, Ecuador)
Tel: + 571.3151985 (Bogotá, Colombia)
glema at sumacinc.com<mailto:glema at sumacinc.com>
www.sumacinc.com<http://www.sumacinc.com/>

From: Dante Garcia
Sent: Monday, November 24, 2014 10:24 AM
To: Gonzalo Lema
Subject: RE: eQuest - Fort Cartson

Hola Gonzalo,  no he podido encontrar el error hasta el viernes que estuve avanzando.
Ahora he estado con otras prioridades, mañana puedo volver a revisar el proyecto.

Saludos,

Dante

SUMAC
Dante Garcia, LEED AP BD+C | Analista LEED Energía
Tel: +511.253.5355 Anexo 16 (Lima, Perú)
Cel: +51.989.685.769 (Lima, Perú)
Tel: +593.4.600.0613 (Guayaquil, Ecuador)
Tel: + 571.3151985 (Bogotá, Colombia)
Tel: +1.773.857.7906 (Chicago, USA)
dgarcia at sumacinc.com<mailto:dgarcia at sumacinc.com>
www.sumacinc.com<http://www.sumacinc.com/>


De: Gonzalo Lema
Enviado el: lunes, 24 de noviembre de 2014 11:17 a.m.
Para: Dante Garcia
Asunto: RE: eQuest - Fort Cartson

Buen día,
¿Alguna novedad?

Yo sigo revisando también.
Saludos

SUMAC
Gonzalo Lema | Mechanical Engineer | LEED GA
Tel: +1.773.857.7906 Ext 7009 (Chicago, USA)
Tel: +1.305.814.8805 (Miami, USA)
Tel: +511.253.5355 (Lima, Perú)
Tel: +593.4.600.0613 (Guayaquil, Ecuador)
Tel: + 571.3151985 (Bogotá, Colombia)
glema at sumacinc.com<mailto:glema at sumacinc.com>
www.sumacinc.com<http://www.sumacinc.com/>

From: Gonzalo Lema
Sent: Friday, November 21, 2014 5:52 PM
To: Dante Garcia
Subject: RE: eQuest - Fort Cartson

Como va?
Encontraste algo mas?

Buen finde.


SUMAC
Gonzalo Lema | Mechanical Engineer | LEED GA
Tel: +1.773.857.7906 Ext 7009 (Chicago, USA)
Tel: +1.305.814.8805 (Miami, USA)
Tel: +511.253.5355 (Lima, Perú)
Tel: +593.4.600.0613 (Guayaquil, Ecuador)
Tel: + 571.3151985 (Bogotá, Colombia)
glema at sumacinc.com<mailto:glema at sumacinc.com>
www.sumacinc.com<http://www.sumacinc.com/>

From: Dante Garcia
Sent: Thursday, November 20, 2014 5:21 PM
To: Gonzalo Lema
Subject: eQuest - Fort Cartson

Gonzalo, te envío el eQuest que revisé, todavía no encuentro el error, solo edité un poco el primer piso ya que dos zonas se sobreponían, mañana seguré revisando y ver si encuentro algo, una consulta, viste este reporte, así son los cfm que deben tener cada zona o es bien alto?

Saludos,

Dante


[cid:image004.jpg at 01D00D49.337195C0]

SUMAC
Dante Garcia, LEED AP BD+C | Analista LEED Energía
Tel: +511.253.5355 Anexo 16 (Lima, Perú)
Cel: +51.989.685.769 (Lima, Perú)
Tel: +593.4.600.0613 (Guayaquil, Ecuador)
Tel: + 571.3151985 (Bogotá, Colombia)
Tel: +1.773.857.7906 (Chicago, USA)
dgarcia at sumacinc.com<mailto:dgarcia at sumacinc.com>
www.sumacinc.com<http://www.sumacinc.com/>

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