[Equest-users] Natural Ventilation Modeling

[Sefa Şahin via Equest-users]

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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