Fresh air in a building brings health benefits and increased comfort level to its occupants. Fresh air provision is considered as an efficient and a healthy solution as it reduces the need for mechanical means to ventilate a building.
For NZEB design goal, passive design measures can be judiciously used to influence movement of outside air into a built space by bringing in fresh air. These interventions can reduce and in some cases (in certain climates) completely eliminate reliance on mechanical means to ventilate a building. Thus largely affecting air-conditioning loads.
Various forms such as appropriate orientation and form, openings in building envelope (windows, doors and ventilators), operable windows, internal space planning, etc. are various natural ventilation strategies that can be adopted. Other advanced ventilation techniques are courtyard effect, stack effect, wind tower, or air earth tunnels.
Climate specific recommendations
Provides information on wind direction in selected locations.
Autodesk Ecotect Analysis
Autodesk Ecotect Analysis is an environmental analysis tool that allows designers to simulate building performance from the earliest stages of conceptual design. It combines analysis functions with an interactive display that presents analytical results directly within the context of the building model.
A graphic-based computer program that displays climate data in dozens of ways useful to architects, builders, contractors, and homeowners, including temperatures, humidity, wind velocity, sky cover, and solar radiation in both 2-D and 3-D graphics for every hour of the year in either Metric or Imperial units.
Natural Ventilation is particularly effective in moderate and cold climates. In such climates it can partially offset or even totally eliminate the requirement of a cooling system.
In composite climate, winter, spring, and autumn months provide an opportunity to run the building on natural ventilation rather than mechanical cooling. A well designed building can respond to the outdoor conditions and reduce mechanical cooling when the conditions warrant.
In warm and humid climate, especially near the coast, natural ventilation can provide the much needed air movement to provide comfort during humid periods.