air-conditioned space are tremendous , with AC / GFA = 67 %. Most of the circulation areas are not air-conditioned . If GFA is used for calculation , this translates to 66 W / m 2 .
To improve the air-conditioned air quality within the building , Menara KEN TTDI put in place an instrument that monitors the chilled water to maintain water plant efficiency in terms of temperature sensors , flow meter sensors and power meter .
In a typical mechanically ventilated office space / room , the air is recycled , and depending on the efficiency of the means employed to freshen the air ( as well as how much electricity is used ), indoor air quality either improves or remains stagnant ; stagnant air quality will result in the Sick Building Syndrome . The syndrome is mainly caused by flaws in the ventilation and airconditioning systems , contaminants produced by out-gassing of some types of building materials , volatile organic compounds , mould , improper exhaust ventilation of ozone ( as a by-product of some office machinery ), light industrial chemicals used within the building , or a lack of adequate fresh-air intake and air filtration .
In Menara KEN TTDI , there is a constant inflow of fresh air into the building , greatly improving the indoor air quality within the building .
Apart from that , 80 % of the AHU condensate is recycled by channelling it from the OA-AHU to the cooling tower .
PASSIVE DESIGN
Menara KEN TTDI was designed using passive and active design principles which increase the efficiency of the usage of resources , energy , water and materials . Passive principles , e . g . high window-wall ratio , where 100 % is wrapping with double glazed units of glass ( SC = 0.21 , Uf = 1.62W / m 2 K ), a glass central atrium skylight is utilised to achieve optimum energy saving by tempering interior temperatures and maximising natural lighting conditions for this building , resulting in an overall heat transfer through the building envelope wall of about 39.85W / m 2 and roof of about 0.6 W / m 2 K which is below the 40.00 W / m 2 guideline as required for the BCA Green Mark Platinum Award .
Figure 10 : Corridor of the Office Floors
Besides that , Menara KEN TTDI is built to face a certain direction , to capitalise on the movement of the sun . With a glass roof in the middle of the building , the spaces are well-lit without actually receiving direct sunlight , making every space in the building a habitable and functional space without the need to turn on artificial light during the daytime .
EXFILTRATION OF COOL AIR FROM AIR- CONDITIONED SPACES
Another outstanding engineering design in Menara KEN TTDI is the exfiltration cool air system . Menara KEN TTDI applies the “ bioclimatic ” design principle , which takes into account the local climate and scientific theories . We have paired the principle that hot air will rise while the denser cool air will fall with some fluid mechanics , enabling the waste air from the offices to be gradually and naturally extracted because of the different pressures within the enclosed office suite and the corridor .
Once the cool air is diffused out into the corridor , our 1.2m high glass railing acts as a container to keep the cool air within the corridor space . The hot air will naturally rise all the way to the glass top of the central glass atrium , which acts as a reservoir for the hot air . The hot air trapped within the central glass atrium reservoir are mechanically extracted by fans , which will turn on once the air reaches a certain temperature . When visitors walk through the corridors , it is comfortably cool without the need for airconditioning in the corridors .
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