[Equest-users] LEED Review Comment - Exhaust Fans

[Ömer Moltay]

Dear Crina,

Thanks for the reply. I just added these exhaust fans to my baseline 
model. The reviewer is also asking for a separate energy consumption 
calculation for the exhaust fans. While trying to capture this through 
separate meters, I just realized that the air volume exhausted through 
some of these independent fans is variable in hourly reports even if I 
define them to be constant volume. I am afraid that this will result in 
mismatching values for energy consumption between the baseline and the 
proposed models.

1. What could be causing the air volume to be variable?
2. Is it a must that both the baseline and the proposed cases should 
display exactly the same amount of energy consumption for these 
independant fan systems?

Thank you,

Omer Moltay, LEED AP BD+C, BREEAM Assessor Mimta Ltd.
Hekimsuyu Cad. 559. Sk. No:39
34255 Kucukkoy Istanbul Turkey
Tel: 90-212-617-2296
Fax: 90-212-617-2297
www.mimtarch.com
www.mimtasolar.com
www.eko-yapi.net

Sürdürülebilir Binalar Blog
http://surdurulebilirbina.blogspot.com

Green Building in Turkey on LinkedIn
http://www.linkedin.com/groups?gid=2278249




14.06.2011 00:04, Bosch, Crina yazmış:
> Omer,
>
> They are talking about independent fans like toilet exhaust or kitchen exhaust. Those values that you have under EF-1 thru EF-9 need to be equal between baseline and proposed model. So, if you have EF-1 at 300 cfm and 2KW for that fan, you need to input the same values in baseline model. Those fans are separate than the Exhaust from the AHU. I usually input them at space level and the kw/cfm for those fans.
> Hope this helps.
>
> Crina Bosch
> Engineer, Mechanical
>
> karpinski
> ENGINEERING
> 3135 Euclid Avenue
> Cleveland, OH  44115
> P  216.391.3700 ext 3087
> F  216.391.0108
> E  cbosch at karpinskieng.com
> W www.karpinskieng.com
>
>
>
> -----Original Message-----
> From: Ömer Moltay [mailto:omoltay at mimtarch.com]
> Sent: Monday, June 13, 2011 9:16 AM
> To: equest-users at lists.onebuilding.org
> Subject: [Equest-users] LEED Review Comment - Exhaust Fans
>
> Dear All,
>
> We have received the following from GBCI regarding the energy modelling
> review:
>
> "Table1.4.2 indicates that exhaust fan systems are reflected in the Proposed model; however, the equipment capacities are inconsistent with the exhaust fan systems (EF-1 through EF-9) as indicated in the mechanical schedules provided for PI Form 4: Schedule and Overview Documents. In addition, the independent fan systems of the HVAC systems in the actual design must be modeled identically between the Proposed and Baseline models at actual equipment capacities (fan volume and fan power) as required by Table G3.1.10 in the Proposed building column, since the fan design air flow rates and fan power per Sections G3.1.2.8 and G3.1.2.9, respectively, only applies to system types 1 through 8 in Table G3.1.1A.
> Revise the
> Proposed and Baseline models so all independentfan systems of the HVAC systems are modeled identically between the Proposed and Baseline models. In addition, separate the energy consumption and peak demand energy for independent#fans in Table EAp2-4 and Table EAp2-5 of the prerequisite form. Further,provide revised SV-A reports reflecting the changes"
>
> Our proposed model has supply and exhaust fans (Supply: AHU, FCU -
> Exhaust: AHU, independant exhaust fans). Our baseline model has supply and relief fans (VAV System).
>
> Please look at Section 6 of the attached Table 1.4.2. Are we expected to additionally model exhaust fans in the baseline case? Do they mean exhaust fans when they say "independent fan systems of the HVAC systems?".
>
> Thanks for all replies,
>
> Omer Moltay, LEED AP BD+C, BREEAM Assessor Mimta Ltd.
> Hekimsuyu Cad. 559. Sk. No:39
> 34255 Kucukkoy Istanbul Turkey
> Tel: 90-212-617-2296
> Fax: 90-212-617-2297
> www.mimtarch.com
> www.mimtasolar.com
> www.eko-yapi.net
>
> Sürdürülebilir Binalar Blog
> http://surdurulebilirbina.blogspot.com
>
> Green Building in Turkey on LinkedIn
> http://www.linkedin.com/groups?gid=2278249
>
>