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ladybug-tools / honeybee-legacy

:bee: Honeybee is a free and open source plugin to connect Grasshopper3D to EnergyPlus, Radiance, Daysim and OpenStudio for building energy and daylighting simulation
http://ladybug.tools
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Make a Component to Output Natural Ventilation Schedules #216

Closed chriswmackey closed 9 years ago

chriswmackey commented 9 years ago

Currently working with alejandra Menchaca to make this a reality. Also, this component should output the natural ventilation period to help make this issue more elegant: http://www.grasshopper3d.com/group/ladybug/forum/topics/efficiently-constraining-analysis-periods-when-simulating-for?commentId=2985220%3AComment%3A1161926&xg_source=msg_com_gr_forum

mostaphaRoudsari commented 9 years ago

This will be a great component but we should make sure that everyone knows that there is no internal AFN is set in honeybee so it won't work in cases with multiple interconnected zones, right? As far as I understand, it is a method for studying a single zone or something like that.

chriswmackey commented 9 years ago

Yes. You are right that we need to be absolutely clear that it is not AFN-based. I can imagine a few cases of cross ventilation where the assumptions might be ok for air walls between interconnected zones of a single floor. However, any buoyancy driven flow between zones will not be supported, such as chimneys or atriums. It will just be for single-sided buoyancy and cross ventilation. All of this said, I know that E+ is still working through a lot of issues with its inter-zone buoyancy flow, which I believe is brand new to E+ 8 so I'm not so sure that users should really be modeling this type of ventilation now anyway.

Also, I should note that I intend to make many of the assumptions as adjustable inputs so that users can be aware of exactly what is going on. Personally, I am coming to appreciate that this simpler method in which you are aware of the assumptions and the exact flow rate is much safer for users than simply hitting a check box for natural ventilation and getting a number that is not very understandable. There are so many factors that can affect the airflow and users really need to be aware of them if the results are going to be helpful.

chriswmackey commented 9 years ago

Now that I have better understood the EnergyPlus natural ventilation objects, I no longer see this component for natural ventilation potential as necessary or helpful. If users can set an indoor temperature at which natural ventilation occurs and run this through an energy simulation, this is much better than trying to guess what the potential should be. As such, I am currently going to close out this issue.