Natural ventilation control strategy

[shorowit]

Currently natural ventilation is assumed to occur whenever outdoor conditions are favorable for cooling, per ANSI/RESNET 301, based on the operable window area.

Could allow some additional inputs:

• [x] How often windows are open (e.g., # days/week) #1161
• [ ] Seasons (heating vs cooling vs swing)
• [ ] How much an operable window can be opened (e.g., 50% for a double-hung window)
• [ ] Disallow natural ventilation during certain hours (e.g., overnight)
• [ ] Allow diversity of days/week of operation (random, 8760 schedule, etc.)
• [ ] For stochastic occupancy, align w/ occupants being home?

[shorowit]

One possibility would be to offer a schedule that represents the percent of operable window area that is open at any given time. For example:

<NaturalVentilationAvailabilityWeekdayScheduleFractions>0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0</NaturalVentilationAvailabilityWeekdayScheduleFractions>
<NaturalVentilationAvailabilityWeekendScheduleFractions>0, 0, 0, 0, 0, 0, 0, 0.1, 0.1, 0.1, 0.1, 0.1, 0.1, 0.1, 0.1, 0.1, 0.1, 0.1, 0.1, 0.1, 0.1, 0.1, 0.1, 0</NaturalVentilationAvailabilityWeekendScheduleFractions>

This would mean that windows are never open on weekdays, and on weekends windows can only open between 7am and 11pm, with 10% of the operable window area opened. (10% could represent, e.g., the assumption that 50% of the area of operable windows can be open, and 20% of that openable area is actually opened by occupants.) Of course, natural ventilation would still only occur based on outdoor temperature/humidity constraints, etc.