The fact that mechanical ventilation has only occurred in the last 100 years or so proves that there hasn’t always been a need for mechanical ventilation, and only natural ventilation systems existed.
Today, there exists a great number of houses that only use natural ventilation, and gain the required amount through operable windows. The use of HVAC units is not a necessity in all circumstances, and in many situations, mechanical ventilation has been used unnecessarily.
This research could show that the ‘need’ for mechanical ventilation is only a perceived one in some situations, and construction firms are more inclined to choose a design strategy which is easier or one that they have more experience in applying. The study also found that there is a “lack of information on natural ventilation in standards and guidelines, and also a lack of published data on case studies of the performance of buildings
This would make it harder for architects to satisfy standards such as ASHRAE standard 55 or ISO 7730. Nevertheless, there are
This can be improved further using a thermal chimney that enhances the natural stack ventilation effect, as the chimney will heat the warm air further creating a suction. Night purge ventilation can be used where the building has openings during the night, which allows cool air into
One example of a project that has used natural ventilation is the construction of the Coventry University Library, which is in
Also, the denser a city is, the hotter it will be due to factors such as the wind. Many natural ventilation techniques rely on wind to bring in cooler air into the building. Furthermore, the option to be able to construct a building further away from the main busy roads may be harder in a denser city due to planning restrictions. For these types of buildings quite a lot of the time they would have to be situated further away and have more space around them from the main areas of their city, otherwise mechanical ventilation would be used in most the building.
A reason mechanical ventilation is used is because there is a variance in standards between buildings and rooms of different function, especially between residential and commercial buildings. For a residential facility, ASHRAE
If these issues in the industry were to be improved by having lots more information on natural ventilation, it could be possible for many companies in different areas to be able to create a suitable environment without using mechanical ventilation. Current trends in the construction industry and historical methods have proven that mechanical ventilation isn’t needed all the time, as “today in Switzerland, Belgium, Denmark and UK a significant percentage of new office buildings have natural ventilation.” This could prove that the need doesn’t exist for every type of situation, but only over time as populations have grown in areas and standards have been raised there has been a demand on more efficient systems such as HVAC at the expense of a higher energy consumption.