natural ventilation openstudio

asked 2026-06-07 08:30:10 -0500

Bishan Thapa
73 ●1 ●1 ●2

updated 2026-06-08 09:12:34 -0500

Aaron Boranian

14480 ●93 ●25 http://bigladdersoftware.com/

I am comparing the performance of two envelopes. However, when modeling natural ventilation, the windows open and close 350-400 hours per year depending on the envelope to maintain the temperature range specified. I was originally planning to compare the zone operative temperature of the two different envelope. With natural ventilation object in place within the model, the ventilation object is opening and closing the windows to regulate the temperature. This totally changes the direction of study. Instead of comparing the zone operative temperature of two envelopes, I am having to compare opening hours of windows to regulate the specified indoor air temperature. Could anyone please guide me on how to model the natural ventilation so that I still can compare the zone operative temperature instead of natural ventilation opening hours?

answered 2026-06-16 12:00:51 -0500

josepsolebonet@telefonica.net

550 ●5 ●7 https://josepsolebonet...

As far as I understand in order to include on a model Nar¡tural Ventilation (windows opening) you should introduce in energy plus the object ZoneVentilationWindandStackOpenArea to do I cannot see any other way than trough a personal measure.

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Thank you for the response Joseph. I am using the object you are referrring to already to model the natural ventilation. The issue with it is - it is regulating the indoor temperature by opening and closing the windows. In my study, I wanted to compare the indoor temperature of two different envelope to see which one of it is better. Two different envelope would not have the same indoor temperature. But this object closes and opens the window to regulate the temperature within the limits specified.

Bishan Thapa ( 2026-06-16 14:29:46 -0500 )edit

Hi. I am not sure whether this would work, but could you run one simulation with Envelope A, record the window-opening behavior, and then use the same schedule for Envelope B through a schedule file? This way, both envelopes would have the same natural ventilation pattern, and their indoor temperatures would be more comparable.

sandip_mep ( 2026-06-17 15:07:31 -0500 )edit

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