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AIR TIGHTNESS OF BUILDINGS TO SAVE ENERGY |
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by Neha Swaminathan | 03-07-2013 02:02
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Building Envelope Performance Energy consumption in buildings is determined by the air tightness of the building. In hotter climates like in UAE as well as in very cold climates, the energy consumption can be controlled by the air tightness of the building. In hotter climates, leaky buildings cause moisture infiltration, deterioration of building materials, poor indoor temperature and humidity control. In colder climates, there is exfiltration where the indoor generated heat escapes to the colder outside air. Air leakage is the uncontrolled flow of air through gaps and cracks in the walls, joints and roof of buildings. A leaky building due to poor design or improper construction or wear and tear will let the moisture in warm desert air to condense and create breeding grounds for mould growth. In Middle Eastern countries, an estimated 60 to 70% of the domestic electrical consumption is spent on artificial cooling and humidifying the air and the building envelope should protect the interiors from the infiltration of the sun's heat and hot desert air. Pressure Testing and Infrared Thermal Imaging Gaps and cracks in the building walls, joints and roof are difficult to detect simply by visual inspection. Gaps are often hidden by internal building finishes or external cladding. In pressure testing, air leakage is measured by the rate of airflow loss like testing a tyre puncture. Pressurization is achieved by using variable air flow portable fans installed in doorways and other external openings. Tracing the air leakage is done by the use of non-toxic vapor generators and infrared thermal Imaging. An infrared camera is used to measure temperature variations reflected from the surfaces of materials. This helps to detect where the energy wastage happens - conditions like hidden moisture in walls and ineffective insulation at windows. Infrared thermal imaging is used in building inspections because it does not require cutting into or damaging the walls or ceilings. This greatly reduces the time and cost of determining areas for improving energy wastage. Exterior infrared thermography is conducted early morning or late evening when inside and outside temperature differences are greatest. Interior infrared survey for moisture intrusion or mould growth can be conducted anytime. Following is a sample picture of infrared imaging |
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22 Comments
Thank you for sharing.
Posted 24-08-2013 19:14
thank you for the information.
Posted 24-07-2013 02:56
thanks for the information.
Posted 23-07-2013 12:28
thankyou for the info.
Posted 21-07-2013 15:29
amazing !
Posted 21-07-2013 15:28
The pic is so clear and really infromative
Posted 13-07-2013 15:41
thank you for the information
Posted 13-07-2013 02:22
very very good information
Posted 12-07-2013 16:58
thanks for the information.
Posted 12-07-2013 16:56
thanks for the information.
Posted 12-07-2013 16:56
Good information!
Posted 12-07-2013 11:51
Nice info Neha
Posted 08-07-2013 03:12
Thanks for sharing nice report on use of thermography system. Thanks for sharing such application of latest technology for anlysis of the situation in bulding .
Posted 07-07-2013 14:06
Thanks FOR the information friend.
Posted 06-07-2013 17:18
hei neha ! that is nice information!
Posted 05-07-2013 17:49
nice info thanks for sharing..
Posted 04-07-2013 12:53
In cold climate like Canada where I am we have homes called R-2000 standard. According to the government "The R-2000 Standard (R-2000) is an industry-endorsed technical performance standard for energy efficiency, indoor air tightness quality, and environmental responsibility in home construction". I am glad to hear from your post that a similar process is used in warm climates as well. Thanks for this information!
Posted 04-07-2013 07:55
Thanks for sharing this information Neha.
Posted 04-07-2013 02:53
Good Info Neha..thx for sharing
Posted 03-07-2013 19:05
Thanks for the info Neha.
Posted 03-07-2013 18:48
Ohhhhhhhhhhhhhh you look like an Indian princess in the profile photo :)
Posted 03-07-2013 09:51
Thanks for the information!!! btw, I like your profile picture! It's pretty :)
Posted 03-07-2013 08:54