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NC-v4 EAp2:Minimum energy performance

Energy modeling of building with natural ventilation

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Ricardo Sá
Director of Sustainability
Edifícios Saudáveis Consultores (503 910 767)
LEEDuser Basic Member
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Dear All,

 

we’re currently involved in a project of an office building pursuing LEED certification. The majority of building areas will be endowed with natural ventilation, complying with ASHRAE 62.1-2010 requirements. In what relates with simulation for purposes of energy performance calculation we have the following doubts:

 

  1. how shall we model ventilation in proposed building? We are planning to consider a permanent infiltration of outdoor air corresponding to the minimum outdoor air flowrate according to ASHRAE 62.1-2010 (only during occupied periods);
  2. regarding baseline building, ventilation will be integrated in HVAC system components. Since proposed building is endowed with natural ventilation, we are planning to consider a ventilation effectiveness equal to 1 for baseline building outdoor air calculations.

 

Do you validate the assumptions above?

 

Regards,

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Fri, 02/05/2021 - 17:47

1. If your simulation program has the ability to model natural ventilation directly, then that would be a more accurate option. Otherwise, your approach of modeling the ASHRAE 62.1-2010 minimum rates via infiltration is acceptable. 2. The Baseline must be modeled identically to the Proposed (natural ventilation), not mechanically ventilated.

Wed, 11/17/2021 - 15:27

Section G-3.1.2.6 specifies that outdoor air ventilation rates are the same in both models (see USERS MANUAL).  Users manual example G-F stands: "However, the baseline building HVAC system, as defined in G3.1.1, provides
cooling during periods of time when natural ventilation is not adequate, for example when the red light
is on."  

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