It is sure that perliamentary standing comitee has taken money from IMA & AYUSH....This commitee consists of some nonsence/fool minister,who does not have minor knowledge of health...so...I request gulam navi azad sir to kick them away....
Dear Anonymous reader,
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Nice to hear from you. To reduce the heat in your top floor you can employ any of the cool roof technology (explore http://www.downtoearth.org.in/content/cool-idea ) or you can opt for some really good techniques developed by Laurent which he has described in his responses in the comment section of this story itself.
Feel free to contact me if you have further doubts.
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Solar systems are the great source of using one form of energy and converting it into another useful form. I would better love to use it for my home. Amazing post.
Hi Avikal, nice to see your responses. I want to stress on the fact that I have been referring to buildings with considerable internal loads, the likes of IT offices and BPOs (core and shell) and not the likes of IHC, CSE or Development Alternatives (owner occupied buildings). The likes designed by so called "commercial firms" and not so "ecologically conscious" ones.
To get to the points raised by you, in such buildings the factor of heat gain by increasing the glass is not more than 2-4% in general. It may raise to around 7 to 8% in badly designed buildings. When you consider internal heat gains because of people and office equipment like computers, heat gains because of ventilation (fresh air requirement) the heat gain through fabric is very less. Again only a fraction of the fabric is glass. I have done many parametric simulations myself on various buildings of this type to see the effects of different WWR and various kind of glass (SHGC and U values). The findings are that WWR of course has impact on heat gains. But, then the real killer is SHGC. The U-Value is still OK. In buildings with high above 40 % WWR the clients are not ready to go for double glazing as it increases the cost many folds, but some still consider it. Double glazing or triple glazing only impacts U-Value and not SHGC. SHGC can be reduced by either selecting technically superior glass OR by simply designing adequate shading. The problem is shading is always seen as an ugly element by the architects who cannot integrate it properly with the facade. So shading dies there.
Having said this I am not hinting that excessive use of high technical glass is harmless. I am stressing the factors which are leading to indiscriminate use of gas and address the same instead of waging good vs bad wars with the glass manufacturers.
1. Lack of design sense and awareness
2. Trade off between the capital cost and operating cost as perceived by the client as it differs in owner operated buildings and tenant occupied buildings (core and shell).
As you said, "There is a plethora of scientific studies which establish that area of fenestration has direct relation with the cooling load on the buildings", but then each building is different and please share some studies if possible.
It is good if triple glazing units are used, but not after designing excessive glass and all the harm is done. But considering its cost factor there are very few takers to it.
Yes, increasing WWR has no positive impact on daylight 'beyond a point'. However overall facade with sensible use and positioning of glass impacts facade design a lot. And for your information daylight if properly designed for can easily penetrate deep into floor place upto 8-9 meters or more. This does not merely imply excessive use of glass, but by carefully designing the facade, windows, lightshelves and shading. There is both mathematical and empirical evidence to it. You may visit RMX JOSS garment factor in Noida to have a look at it first hand.
I agree shading is very important as I have mentioned above. But we cannot just go back to the same old methods of shading as we are not "working in the same of methods in the same old buildings". Functionally, yes, shading has a purpose to serve and it does not change with time. The major issue is lack of understanding of its importance and moreover the bigger issues of " design and aesthetics" among the architectural fraternity who most often fail to integrate it properly.
One can wear a nice khaki kurta and pyjama and be pretty much comfortable in the month of August in Delhi, then why is one required to wear a "business suit" and then require to sit in air conditioned environments. I am not recommending one or the other, I am just giving a very rough comparison.
"If this is such a well understood fact then why energy code is not acknowledging this and agreeing to an upper limit of 60 per cent?". The purpose of any code is to give a right direction at the same time not limiting the creative freedom of architects in using the available materials. It is possible to design a 60% WWR building facade more efficiently than doing a bad 40% WWR facade design. Giving an upper limit does not necessarily mean that it should be used indiscriminately. It is a freedom given that should be used in right spirit only in necessary conditions.
I would very much like to see your documentation. Could you please provide me more links to it.
Thanks and best regards,
The mentioned study was authored by M. C. Singh and S. N. Garg who belong to the Centre of Energy Studies in IIT Delhi. Furthermore, the study is titled 'Suitable Glazing Selection for Glass-Curtain Walls in Tropical Climates of India". Hope this answers your query.
In South India, this a staple green eaten by every class of the society. It is well known for curing ulcers of the mouth and stomachs so much so that people apply the juice from its leaves when they get a cut on their skin or on a fresh wound. In Tamil, we this is called Mani Thakkali (berry tomato) or Sukkutti.
It will be nice if the author had explored how it is used in rest of India along with its usage in other far-off countries.
I would to like know which department of IIT Delhi studied this matter. I am also from jodhpur.