Why and when to ventilate?
We ventilate our buildings to provide a healthy indoor environment. And we ventilate countinously and always.
From a historical perspective to today
Throughout history, humans always looked for better living conditions and healthier air.
Humans and animals have evolved solutions to either adapt to their existing environments or made changes to improve them. So the main focus has been always on keeping heat in buildings, however always with strong focus on good indoor air quality.
Today is no different — we need to ventilate our buildings to provide a healthy indoor environment for people.
Buildings, like humans, need to breathe.
Why do buildings need to breathe?
People need to breathe fresh air. This happens naturally outside where fresh air is naturally found. However, people work and live inside buildings, some say we even spend around 90% of our time indoors.
So it is important that we feel good indoors.
Why do we ventilate? It is our basic need for fresh air.
- To create air movement which improves the comfort of occupants.
- To remove 'stale' air and replace it with 'fresh' air.
- To moderate internal temperatures.
- To reduce the accumulation of humidity.
- To manage odours, other gases and various pollutants that build up during occupied periods.
And why do we have a basic need for fresh air?
It is all about comfort. So, can you feel comfort?
We are not the same persons — and we for sure feel differently about the environments we are in. In the buildings, there are can be different indoor climate conditions, sometimes based on various activities (such as office or shopping mall or sport hall environments, etc.) and sometimes because the indoor climate can feel differently to different people.
Always take a person's physical characteristics into account when considering their thermal comfort. Factors such as their size and weight, age and fitness level can all have an impact on how they feel, even if other factors such as air temperature, humidity and rate of air movement are all constant.
And can people adapt to the thermal environments there are in? Can we be fully satisfied with the indoor climate in buildings?
Occupants who enjoy more control of their indoor environment may tolerate a wider range of the indoor temperature. Adaptive thermal comfort is an idea based on an occupant’s connection to the outdoors and control over their environment.
Are you feeling the comfort?
Comfort and ventilation
Therefore, one of the challenges for building engineers is the adequate design of ventilation for maximum comfort for buildings' occupants. Health and comfort of people inside built environments can be evaluated by various parameters, which is often summarized as the indoor air quality.
Other important parameter is the indoor thermal comfort, which based on building occupant's satisfaction and also based on their perception of people. Thermal comfort can be defined as a person's state of mind or perception of whether they feel too hot or too cold. Due to large variations from person to person it is difficult to satisfy everyone within the same thermal environment.
The interaction between indoor air quality, indoor thermal comfort and various ventilation strategies are also directly link to the energy consumption buildings.
The importance of ventilation — provide, control and reduce
Without a ventilation system in place, you have no control of the air flow in a building. Proper ventilation protects a home from unwanted toxins, pollutants, and odours. Ventilation can also help protect the overall structure of a building by eliminating excess moisture from the air and to prevent overheating by venting the excess heat and also for cooling the indoor environment if the outside is too hot.
We ventilate for comfort (for indoor environmental quality, not indoor air quality). Buildings occupants — we as humans — are actually the best 'sensors' in a building, because we can also take actions to change the situation indoors.
Are you ready to learn more about providing, controlling and reducing in ventilation?
Ventilation can do more than help prevent building occupants from getting sick; it can provide an improved indoor environment.Anonymous