Natural Ventilation Modeling

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Dear All,

We are working on residential building that are natural ventilated in
Istanbul/Turkey. The building is heated and cooled by radiators and
split AC respectively. We have to take into account the heating and
cooling loads associated with natural ventilation on both proposed and
baseline model. How can i model this loads ? Please note that our
proposed system type is PSZ, baseline system type is PTAC.

Thank you,

Best Regards

Sefa Sahin, LEED AP BD+C
Mimta EcoYap?
Hekimsuyu Cad. 559. Sk.
No:39 34255 K???kk?y ?stanbul T?rkiye
Tel: 90-212-617-2296
Fax: 90-212-617-2297

www.eco-yapi.com

www.facebook.com/mimtaecoyapi

www.linkedin.com/company/mimta

via Equest-users's picture
Joined: 2016-07-15
Reputation: 400

Dear All,

We are working on residential building in Istanbul/Turkey. The building
is heated and cooled by radiators and split AC respectively. Residential
units are not include any fan for outdoor air supply. All residential
units are natural ventilated.

We got following comment after design final submission :

"IEQp1: Minimum Indoor Air Quality Performance indicates that natural
ventilation is designed for residential spaces. However, it is unclear
whether the heating and cooling loads associated with ventilating the
building have been accounted for in the energy analysis. It is unclear
if the residential fans serving the dwelling units are currently modeled
as cycling on to meet the loads when there is a call for heating and
cooling. Most simulation software models zero ventilation when the fans
are cycled off. Therefore, if the fans are modeled as cycling to meet
the loads, the Baseline and Proposed Case energy model should be revised
to account for the anticipated ventilation loads anticipated when the
fans are cycled off. (e.g. infiltration should be increased equally in
both cases to assume that a certain portion of the windows are open to
meet ventilation loads). If the HVAC system serving residential spaces
are accounted for when the fans cycle off. Provide sample inputs for the
Baseline and Proposed Case dokumentating how the ventilation was
accounted for, and confirming that the ventilation and infiltration have
been modeled identically in the Baseline and Proposed Case models."

We did not understand reviewers comment about fans. Because, our natural
ventilated dwelling units are not include any supply outdoor air fan. Is
there something we do not understand?

We are planning to do folllowing:

We will add same infiltration rate all day long on both Baseline and
Propsod Case amount of ASHRAE 62.1-2007 Minimum Outdoor Air Requirements.

Is our plan proper? Will our submission be accepted?

Best Regards
Sefa Sahin

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Joined: 2016-07-15
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