About Indoor Air Quality
Children aged 1- 3 years may breathe 20 - 30 times per minute, whereas older children and adults can breathe 12 - 20 times per minute, so children are exposed to more risk than adults. As breathing is continuous process, we need to ensure our children are living in a space with good indoor air quality.
Air Conditioning is the process of controlling Temperature, Relative humidity and Purity of air in indoor spaces.
Comfort temperature of human being is 24 +/- 2 Degree centigrade.
Humidity is a measure of the amount of water vapor in the air. Relative humidity is a percentage that represents the amount of water vapor in the air at a given temperature compared to the max possible water vapor amount at that same temperature. Relative Humidity for human comfort shall be in between 30 to 60%
Purity of air : Filters in AC units, trap and hold many types of particulates and contaminants that could affect your health and comfort, including dust, dirt, pollen, mold, mold spores, fibers, lint, hair, bacteria and micro-organism.
Ventilation is the process by which ‘Fresh’ air (normally outdoor air) is intentionally provided to a space and the stale air is removed from that space to maintain indoor air quality.
Ventilation is mainly used to control indoor air quality by diluting and displacing indoor pollutants, it can be done via natural ventilation, mechanical ventilation or mixed ventilation.
Natural Ventilation : Inducing air into a space by means of planned openings such as doors, windows, louvers.
Mechanical Ventilation : Inducing air into a space by means of supply fan and removing air by means of extract fans.
Mixed Ventilation : It is a combination of both mechanical and natural ventilation process.
Can we maintain Indoor Air Quality, while AC Unit is Switched OFF?
Air Conditioning is the process of controlling Temperature, Relative humidity and Purity of air in indoor spaces. It has hardly any role to play in ventilation
Whereas Ventilation is the process by which ‘Fresh’ air (normally outdoor air) is intentionally provided to a space and stale air is removed.
Even if AC unit is switched OFF, we can maintain indoor air quality by running fresh air & extract air fans of your Villa or Town house.
4 Types of Ventilation Systems
Extracts Fan Only in Kitchen & Wash Rooms.
Extract Fan & Untreated Make Up Air
Extract Fan & Treated Make Up Air
Energy Recover Ventilator or FAHU
For more details Read the Blog
What happens if Fresh Air is not supplied to Villa
The Extract Fans only remove the stale air, but it does not make up the space with the fresh air, which leads to negative pressure in space. Also be noted that as it is air-conditioned space, the temperature of extract air discharged to atmosphere is around 24 C.
Due to negative pressure, the outdoor air will penetrate by whatever available means such as windows or door openings. This outdoor air will carry humidity & impurities such as dust and sand. In peak summer the outside air temperature shall be around 46 C, whereas room temperature maintained around 24 C. Difference of temperature will add load to AC system of the Villa.
How do we know when Indoor Air Quality is Bad?
1. If you smell Unpleasant odors, when your back to home after few hours of being outdoor, it happens as a result of stagnant air.
2. If you notice ordinary smells that linger longer than they should, this is a sign that your home doesn’t have proper ventilation. If the odors from last night’s dinner are still there the next day, there’s a good chance that pollutants are hanging out as well.
Indoor Air Quality - Dubai
The Dubai Municipality regulates the IAQ (Indoor Air Quality) with the stipulation of less than 0.08 ppm (parts per million) of formaldehyde, less than 300 micrograms/m3 of TVOC (Total Volatile Organic Compound), and less than 150 micrograms/m3 of suspended particulates (less than 10 microns) in 8 h of continuous monitoring prior to occupancy. These IAQ standards need to be continuously adhered in a stringent manner, but as lack of ventilation due to continuous air conditioning and indiscriminate use of unproven finishing materials have increased, indoor air quality deteriorates day by day, threatening the health of residents. Exposure to polluted air in the long term can lead residents to lowered immunity, respiratory ailments, hypersensitivity, allergies and susceptibility to viruses.