ANALYSIS
The author, a city-based architect and historian, talks about the effectiveness of Jaali
In today's times when green movement is being hijacked by select manufacturing lobby and the array of service providers with tools, norms and parameters drawn from the west, it is imperative to look into our own backyard and review what tools and strategies did architecture of the place applied for centuries. A look at the vernacular/traditional architecture reveal that these built forms have proven their performance over centuries in terms of combating environmental conditions with least or no electrical energy spent for the same.
A number of architectural elements have contributed in respective regions to arrive at comfort conditions with optimisation of material resources and energy consumption. Jaali is one such element of architecture that has been an effective tool in addressing environmental comfort.
Jaali as small perforations in a wall has been versatile enough to prove effective in hot dry as well as hot humid climate zones. Jaali manages to cut down on direct sun and thereby the heat ingress. It also allows movement of air for cross breeze and ventilation. Jaali breaks down total square metre of consolidated aperture area of a typical window into number of small holes. The holes are nearly of the same size or often smaller than the thickness of the material it is built with. This means each void is a cubical proportion of height equal to depth, protecting ingress of direct sunrays and haze as well as glare associated with it, for most of the sun angle through the day and across seasons.
It only cuts the glare but lets illumination through, not affecting the intensity of light. Similarly even view across the aperture is maintained. In fact, it makes the view more convenient to Indian notions of privacy. From within, everything outside is visible through Jaali holes but from the outside, nothing gets visible inside due to light difference. This best suited privacy notions and therefore was synonymous to Rajput and Islamic architecture in Middle Ages, the era of defence.
Not only does it work for light, sun and view, it also works scientifically for wind. Both Bernoulli as well as Venturi laws apply effectively through the Jaali. When air passes through smaller aperture, its velocity increases. Thus there is a perceptible presence indoors even with a mild breeze outdoors. This improves efficacy and provides a deeper penetration. Principles of physics also suggest that when air is compressed and released it becomes cool. This is similar to an air-conditioner where compressor, as the name suggests, compresses the air and releases the same through microholes. Thus, Jaali, in micro ways, helps cool the air by passing the same through small holes.
Jaali was an effective element replacing modern day glass for a transparent view and yet improving on the glass by controlling glare and heat and allowing breeze. The proportion of holes was larger and the overall percentage of opacity lower in the humid climates like Kerala and Konkan compared to the drier climes of Rajasthan and Gujarat.
Thus, glamour of glass for uninterrupted view is not a new phenomenon. Jaali achieved the same with better aesthetic grace as well as environment management within socio-cultural denominations of privacy and security.
pandyatin@hotmail.com
Delhi: All primary schools closed, classes shifted to online mode due to rising pollution levels
BIG trouble for Anil Ambani, criminal charges against his Rs 14422 crore company over...
Bhool Bhulaiyaa 3 producer calls Singham Again team 'unfair' after the box office win
From Play to Pay, Gaming Is Big Business And A Genuine Professional Prospect
Leasehold vs Freehold: Exploring Options for Expats and Investors in Dubai
Mukesh Ambani's Reliance, Disney complete Rs 70352 crore media merger, to be headed by...
Badshah lands in legal trouble, case registered against rapper for...
GRAP III imposed in Delhi: What is allowed, what is banned amid 'severe' air quality
'Throwing me in deep end': Ricky Ponting takes fresh dig at Gautam Gambhir over Virat Kohli remarks
Revolutionizing Inventory Management in the Cloud Era: Pradeep Kumar’s Strategic Innovations
Delhi: AAP's Mahesh Khichi elected mayor as party defeats BJP in MCD polls
Delhi Air Pollution: GRAP 3 to be imposed in national capital from Nov 15, strict ban on...
WATCH: Inside Rinku Singh's Rs 3.5 crore luxurious house with rooftop bar, private pool
Renowned Yoga Guru Sharath Jois passes away at 53 after suffering heart attack
NASA alert! Giant 'God Of Chaos' asteroid set for close approach to Earth, may trigger astroquakes
UPPSC protest BIG update: RO-ARO exam postponed, PCS prelims to be held in one day
This man earned more money than Mukesh Ambani and world's richest man Elon Musk in one day, he is...
'World's best....': Japan vlogger's reaction to Bengaluru airport goes viral
Sania Mirza named Sports Ambassador of THIS city, not Delhi, Hyderabad, Jaipur
Shloka Mehta turns heads in sleek white gown at Tira store launch, see pics
Amid Abhishek Bachchan and Aishwarya Rai divorce rumours, Jaya Bachchan surprises everyone with...
IND vs SA: Arshdeep Singh goes past Bhuvneshwar Kumar to become Indian pacer with most....
Mukesh Ambani, Isha Ambani’s luxury retail chain opens new store at...
PM Modi to receive Dominica’s highest national award for...
Shraddha Kapoor says people with big foreheads are…
'Busy making...': Kanhaiya Kumar sparks row with remarks on Devendra Fadnavis' wife; BJP hits back
'Full baarati vibes': Vietnamese man's epic 'nagin dance' steals show at Mumbai event
Tilak Varma credits THIS player for his century against South Africa, says 'He gave me...'
UPSC IFS Mains Admit Card 2024 to be released today at upsc.gov.in, check direct link to download
'Be prepared for...': Rupali Ganguly's stepdaughter Esha Verma REACTS to Rs 50 crore defamation case
Saudi, Iran: Cautious dance toward détente?
Anushka Sharma shares glimpse of Children’s Day special dish for daughter Vamika, son Akaay
Jaw-dropping! Man wraps massive green anaconda around his shoulders, internet says...
Donald Trump plans to end Russia-Ukraine war with THIS move, is expected to 'soon' appoint...
As pollution worsens in Delhi with AQI at 'severe' level, experts at COP29 urge India to...
SDM Assault Case: 60 people arrested in Rajasthan's Tonk
Veg thali cost more than non-veg thali in October, here's why
Land drug trafficking patterns in North-Eastern Region
Shillong Teer Result November 14, 2024: Know updates on lucky winning numbers
Mukesh Ambani's SUPERHIT offer for Jio users: Get unlimited validity for 84 days at just Rs...
Delhi air quality dips to 'severe' category as AQI nears dangerous...
Bigg Boss OTT-fame Bhojpuri actress Akshara Singh receives extortion threat
‘All I do is…’: After Arjun Kapoor confirms breakup with Malaika Arora, her cryptic video goes viral