Industry Code of Practice Indoor Air Quality 2010
Indoor air quality or IAQ (Indoor Environment Quality) is a scientific term discuss the exposure of indoor related hazards and their risk to human health. In 2010, DOSH publishes significant code and standard related to this issues. The ICOP was a specific guideline aimed to guide the employer or building owners to ensure their health and safety related to the indoor environment was taking care of. The question arises was the implementation of this ICOP-IAQ. Majority of the big corporate company taking their initiative to ensure their quality of air being served by their mechanical ventilation was out-performed.
Design of mechanical system for indoor air quality
Why was indoor air quality a concern? In this decade, the majority of the building equipped with the mechanical ventilation thus limit the outdoor air pollutant from coming inside the building and ensuring the thermal comfort issues in the building was taking care of. There are 2 types of ventilation usually used for the typical office building or any building in the world namely:
- Split unit air conditioning system
- Centralize air-conditioning system
The major differences between this two system were the mechanical room whether exist or not. Typical design of spilt unit using a normal compressor to exchange the heat from the indoor environment, and deliver cool air through the specific copper pipe to the cooling coils. This cooling coils then being blown by a specific indoor unit that controls the required temperature by the occupants.
The second design required mechanical engineers to design the required indoor thermal comfort level to the acceptable condition and all the air delivery through the specific mechanical room or usually call Air Handling Unit. Air handling unit (AHU) is a protective place serve to deliver the sum of air in bulk condition to be delivered to the branches of the duct that dedicate to the specific room.
Both designs required sufficient mix of outside air in term of the dilution of Carbon dioxide (CO2) to ensure the ventilation efficiency was up to the need. Recently in 2013, a study conducted by Syazwan et al., 2013 reveals that the air infiltration coming from the outdoors influence the indoor air quality sickness or problem. This issue was due to the inadequate maintenance of the mechanical system that leads to the sick building syndrome. To date, there is numerous standard that helps engineers and occupational health specialist to identify the indoor air problem, evaluate the risk and control the problems.
Sick building syndrome is a collective of symptoms that usually encounter by occupants due to lack of sufficient clean air delivered to the occupants by the mechanical system. These symptoms will be faded away by the time occupants leave the building and moving back or stay in the other buildings.
Let us learn how the indoor air quality influences the health of occupants. For more details, you can further read the article related to indoor air quality. You also can subscribe investigation book for indoor air quality available for your references. For more references related to indoor air study, please subscribe.
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