‘cool roof ’ can protect from heat wave · 10/12/2017 stay cool under cool roofs 2/3 hmda,...
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10/12/2017 ‘Cool Roof’ Can Protect From Heat Wave | Leading Asian News in the UK
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‘Cool Roof’ Can Protect From Heat Wave JUNE 26TH, 2017
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Experts say that with India too facing the effects of global warming with abnormally hightemperatures, simple and low-cost ‘cool roof’ measures may bring relief to thepeople….writes Vishal Gulati
“Simple steps such as painting roofs with lime-based whitewash, adding tarp-likecoverings, or white ceramic tiles, can help bring down roof surface temperatures by 30degrees Celsius and also reduce indoor temperatures by three to seven degrees,” New York-based advocacy Natural Resources Defence Council’s (NRDC) Director of India ProgrammeAnjali Jaiswal said.
She said the innovative low-cost cool roof projects in Ahmedabad and Hyderabad cities,piloted this year, were a great success.
Climate experts say 13 of the 15 hottest years in India have been recorded since 2002, withthe highest temperature recorded in 2016. This summer, parts of India have experiencedabnormally high temperatures in March and April. Heat waves occur from April to June,
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A man riding a two-wheeler �ttedwith an umbrella to beat thescorching heat in Mathura(Photo: IANS)
A boy plunges into a pond to beatthe heat on a hot day in Kolkata(Photo: Kuntal Chakrabarty/IANS)
Children beat the heat on a hotday in New Delhi (Photo: IANS)
before the Indian subcontinent is awash with monsoon.
An NRDC interim report “Cool roofs: Protecting local communities from extreme heat” thismonth says less than 10 per cent of India’s households have air conditioning.
With summer temperatures regularly exceeding 40 degrees Celsius (104 degreesFahrenheit) in a majority of India’s cities and large sections of population in low-income
housing having little to no access to electricity, access to cooler homes is a matter of survival, not just comfort.
The report, quoting a research by the International Institute of Information Technology in Hyderabad and the Lawrence BerkeleyNational Laboratory, says ‘cool roofs’ could reduce peak energy demand by 10 to 19 per cent in buildings in Hyderabad.
This will potentially help reduce citywide air temperature by two degrees Celsius (3.6degrees F) and save Rs 500 crore over 10 years, it says.
A new study, published in journal Nature Climate Change, indicates nearly one-third of theglobal population currently gets affected by heatwaves and the �gure could become “nearlythree quarters by end of this century.”
Another study published this month in the Science Advances journal, which is Indiaspeci�c, tries to link climate change to heat-related deaths.
It said as the mean summer temperature and the annual number of heatwave daysincreased in India from 1,960 to 2,009, there was a ‘substantial increase’ in heat-relateddeaths.
Some experts expect India’s temperature to rise by 2.2 to 5.5 degrees Celsius by the end of this century, said the study based onIndia Meteorological Department (IMD) data.
The IMD de�nes a heatwave as when temperature on any given day is more than three to four degrees Celsius above normal atplaces where the usual maximum is above 40 degrees.
“India is showing the world that in our �ght against climate change we can take smart steps right now to protect millions ofpeople from deadly heatwaves. These groundbreaking heat action plans like ‘cool roofs’ also demonstrate that it’s feasible tocreate similar heat preparedness plans across Indian cities,” NRDC’s India consultant Nehmat Kaur said.
Last year was India’s hottest year on record — 0.91 degree Celsius above the 1961-1990average temperature, the IMD said.
Records began in 1901. Since then, India’s average temperature has increased at a rate of0.65 degree Celsius a century.
In Southeast Asia, 15 to 20 per cent of annual work hours may already be lost in heat-exposed jobs. This may double by 2050 as global climate change progresses, says a 2016study by the US-based National Center for Biotechnology Information.
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Stay cool under cool roofsBy KV Moulika (https://telanganatoday.com/author/moulika) | Published: 25th Mar 2017 12:00 am
Hyderabad: Just a few days into summer and the mercury has already been soaring steadily and offering a glimpse of what is instore for the days ahead. Even hours spent without venturing out in the hot sun but staying indoors at home or office havestarted to leave one exhausted from the heat effects. And completely depending on the air-conditioner, cooler or fans has itsown inevitable consquence, the power meter hopping away merrily and printing out a monthly electricity bill that leaves onedismayed. Are there any energy-efficient options that not only throws a shield against the piercing summer sunrays but are alsocost-effectvie? Cool-roofs could be one such option.
A workshop in the city held at Administrative Staff College of India (ASCI) this week had experts discussing and deliberating onthe concept of cool-roofs.
David B Goldstein, Co-director Energy Programme, Natural Resources Defense Council, US, who delivered a talk on ‘Cool Roofs –Technology, Policy and Implementation’ said Hyderabad can lead by example by making cool-roofs mandatory for all publicbuildings. “The city can develop resources for training on cool-roofs installation and also develop educational and promotionmaterials to initiate awareness campaign for cool roofs,” he said.
In his presentation, Dr Vishal Garg, Associate Professor, International Institute of Information Technology, Hyderabad (IIITH),described a cool roof as one designed to reflect more sunlight and absorb less heat than a standard roof. “These can be made ofa highly reflective type of paint, a simple sheet covering or highly reflective tiles or shingles,” he said.
“With rising temperatures and increased frequency of heat waves, cool-roofs have the potential to provide affordable coolingfor millions without access to air conditioning and other more expensive cooling resources,” Dr Garg said.
The National Resources Defense Council (NRDC) and Administrative Staff College of India (ASCI) are now embarking to kick-startthe work on city Cool-Roofs Policy Programme in Hyderabad.
Appreciating the efforts of NRDC and ASCI aiming to enhance overall energy demand and save lives, Navin Mittal, Secretary,Municipal Administration and Urban Development said, the State government has been taking steps to maximize energyefficiency in buildings by moving towards phased adoption of the Energy Conservation Building Code (ECBC). “The cool-roofsprogramme can complement the efforts of State government in achieving energy efficiency,” he said.
Along with kick-starting Hyderabad’s Cool-Roofs Policy Programme, the workshop launched the pilot implementation of onlinecompliance system wherein IAS Community Centre building, which is currently being designed, and will go through TS ECBCcompliance process.
What is a cool roof?
A cool roof is a roofing system that delivers higher solar reflectance and higher thermal emittance than standard designedroofing products. Cool roofs are either white or some other lighter shade color
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10/12/2017 This summer, cool roofs can deflect heat: GHMC works on project with tech experts - Times of India
https://timesofindia.indiatimes.com/city/hyderabad/this-summer-cool-roofs-can-deflect-heat-ghmc-works-on-project-with-tech-experts/articleshowprint/58337505.cms 1/2
This summer, cool roofs can deflect heat: GHMC workson project with tech expertsTNN | Apr 24, 2017, 11.25 AM IST
Printed from
HYDERABAD: With the city bracing for a torrid summer this year, experts
have suggested using `cool-roof ' mechanism to limit the heat absorption
of buildings.
The state government too said it plans to promote the idea. In March,
officials from the municipal administration and urban development
department (MA&UD) along with the Greater Hyderabad Municipal
Corporation met with members of the Natural Resources Defence Council
and decided to work together to implement the project.
"The state government is committed to ensuring that the people do not
suffer from any weather related illness, we will fully support this initiative,"
said an official from the GHMC.
Experts from the International Institute of Information Technology-Hyderabad, who are currently studying the matter, say that
cool-roofs are one of the most cost-effective ways of keeping the internal temperature of a house under control.
"Cool-roofs are nothing but white-coloured roofs that reduce the internal temperature of a house. With temperatures soaring,
10/12/2017 This summer, cool roofs can deflect heat: GHMC works on project with tech experts - Times of India
https://timesofindia.indiatimes.com/city/hyderabad/this-summer-cool-roofs-can-deflect-heat-ghmc-works-on-project-with-tech-experts/articleshowprint/58337505.cms 2/2
people who can afford air-conditioners or coolers are forced to spend more on electricity," Dr Vishal Garg, IT in Building
Science, IIIT-H said.
Revealing a few of the preliminary findings of his stu dy, Garg said that using coolroof technology beings down `heat-discomfort
level' by as much as 20%.
"There are many simple techniques that people can use to have a cool-roof. A few would be the use of lime-ba sed white wash,
white ceramic tiles or a tarpaulin like covering on the roof. Temperatures could be brought down by as much as five degrees
Celsius by using such methods," said Rajkiran V Bilolikar, an associate profes sor (energy area), Administrative Staff College of
India (ASCI).
Cool-roofs can help safeguard vulnerable groups such as children and the elderly from excessive indoor heat. According to a
study by Lawrence Berkeley National Laboratory (LBNL) in the US and International IIIT-H, commercial buildings can annually
save 13-14 kWhm 2 of energy by switching to cool-roofs. A commercial building with 150 square metres roof area can save up
to Rs 15,000 annually in the electricity bill.
They also mitigate the heat released from roofs during night. White roofs lower air temperatures in cities. These also last
longer.
News in Shakshi Hyderabad edition on 14th June 2014.
News in Andhra Jyothi Hyderabad edition on 14th June 2014.
Andhrajyothi
June 14th, 2014
Dr. Ashok Sarkar, Task Team Leader- Energy Efficiency, World Bank stated that with the help of cool
roof technology, one can achieve energy efficiency and indoor comfort at a much lower cost. A One
day multi-stakeholders workshop on 'Cool Roof for Rural Poor' was organised by the Centre for IT in
Building Science, International Institute of Information Technology, on Friday. The workshop was
organised under the project under 'Cool Roofs for the Rural Poor: Saving Energy, Beating the Heat
Affordably' supported by the World Bank Innovation Challenge Program FY 2014. Experiments were
conducted at the ZPH School, Mucherla, Telangana and at VNHM School, Nagpur and the results
were promising. Dr.Ashok Sarkar said that it is very beneficial to adopt this technology into houses.
Dr. Jayant Sathaye, Senior Scientist and Strategic Advisor, Lawrence Berkeley National Laboratory,
USA, the principal investigator of the project Dr.Vishal Garg and Dr.Kotharkar participated in the
workshop and shared the project details with the public.
12/10/2017 Construction World Magazine India | The maximum potential for saving electricity is in buildings
http://www.constructionworld.in/News/Themaximumpotentialforsavingelectricity/96854 1/10
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- Dr Vishal Garg, Associate Professor & Head, Centre of IT inBuilding Science, IIIT-HyderabadWith the ever-increasing requirement of energy and powershortages in our country, came the need to identify a solution,which would work towards utilising power efficiently and savingenergy. In 2007, the Energy Conservation Building Code (ECBC)came into effect to promote energy-efficiency in the buildingsector. Dr Vishal Garg, Associate Professor & Head, Centre of IT
CATEGORY
THE MAXIMUM POTENTIALFOR SAVING ELECTRICITY ISIN BUILDINGSINTERACTION / MAR 2016
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in Building Science, IIIT-Hyderabad, who heads the Centre for ITin Building Science, has based his research and area of expertisein the field of energy simulation and lighting, and played apivotal role in the rollout of ECBC. He shares more inconversation with SHRIYAL SETHUMADHAVAN.
How do you view the demand for power in India and what isdriving the need to conserve energy?Buildings are the major consumers of electricity and, accordingto estimates, building stock is going to double in the next 15-20years. With this, there will be a huge demand for energy. Hence,it is important for supply to be in line with increasing demand.Also, in developed countries, if energy consumption in buildingsis reduced, probably one generation unit is shut down. Theinteresting thing about India is that if I reduce my energyconsumption, I don´t install one generation unit. So, if we areable to save more energy, the gap can be reduced, as would bethe pressure to install more generation units. The maximumpotential for saving electricity is in buildings.
What does ECBC primarily comprise?ECBC has five areas of focus. The first is the envelope, and thecode focuses on how its components of walls, glass, roof andshading elements can be made more efficient.
The second is controlling and saving energy through lighting.The third and major area is air-conditioning, which includessystems, fans, pumps, chillers, etc. The fourth is powerdistribution - how efficient is the distribution of power,transformer, motor and all electrical aspects? And the fifth is thehot water aspect - are we using wave heat or solar energy togenerate hot water; if we are using boilers, how efficient arethey? As for compliances, ECDC has two approaches of´prescriptive compliance´ and ´performance method´.Prescriptive compliance clearly gives specifications of all theaspects of buildings. This depends on climatic conditions andbuilding usage, without much flexibility. In the case of theperformance method, the logic is simple: Show the energyconsumption of a building and proof of the energy being saved.So this is all performance-based. We simulate the building,which is designed as per prescriptive specifications on computersoftware and find out how much energy it will consume. This iscalled the standard case. Then, we simulate the buildingproposed to build and discover how much energy it willconsume as per the proposed specifications; this is called the
12/10/2017 Construction World Magazine India | The maximum potential for saving electricity is in buildings
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proposed case. If the proposed case energy consumption is lessthan the standard case energy consumption, it means mybuilding is good enough and will comply with the code.
Is the ECBC code mandatory nationwide?ECBC is or was developed by the Bureau of Energy Efficiency,Ministry of Power, in 2007. But each state had a choice to take itas a standard and make it a code. When a building is beinggranted permission, many aspects are taken into consideration.They check if it complies with the bylaws, the fire code andothers. So, this is one more check to ensure that the buildingcomplies with the energy code. Rajasthan was the first state tonotify it, and now eight to nine states have made it mandatory.However, in some cases, it is mandatory on paper, but not muchis being implemented.
Please introduce us to the innovations and technologiesthat go into creating better energy-efficient systems?First, we are forgetting our traditional construction style,suitable for our climate. Even before innovations andtechnologies, we need common sense. If we follow thearchitecture followed in the West, by making big glass boxes,not shading our buildings, etc, we are obviously in trouble.
On the contrary, if we go by the basics of architecture anddesign as per climate and climatology, half the battle will bewon. And then, when we need to improve these designs, theneed for technology steps in. Shading, for instance, is mostcrucial in a building because the solar wave in buildings in Indiais the biggest contributor to the air-conditioning load.
So here, the orientation, external and internal shading, glassproperties, etc, play an important role. The façade is the firstline of defence for the building. By improving the façade, we canstop heat from entering the building. And if the heat still entersthe building, we require more efficient air-conditioning andlighting systems.
Cool roofs also play a role in conserving energy...The cool roof is not an innovation. These were with us hundredsof years ago. And today, when energy is becoming a problem,the concept of a cool roof is coming back to us as an innovation,and we are getting new products like coating, films, tiles, ourtraditional whitewash, white ceramic tiles and some others. Myquick analysis is that coatings don´t seem to work well, the waywe construct and use our roofs. In India, roofs are not
12/10/2017 Construction World Magazine India | The maximum potential for saving electricity is in buildings
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inaccessible, and we have flat roofs instead of sloping ones.This, at times, leads to water collection on the roof and thecoating gets damaged. People walking on the roof or draggingequipment can also damage the coating. According to mypreliminary research, it is better to have tiles. You could usewhite ceramic tiles; they will last for five decades. You will havelittle maintenance compared to coatings and membranes, whichare delicate and need maintenance every five to seven years.You have to recoat it and they are expensive. So I would love togo back to the basics and the knowledge that we had andapplied ages ago.
Are builders and developers open to adopting thesemethods and techniques to conserve energy?I have found builders very receptive. If an IT company isdeveloping its own building, whatever money the owner spends,he will get the benefits in terms of energy savings.
So the spend might be Rs 10 crore, but there would be ayearly saving of Rs 5 crore. So, this could make businesssense. But for the builder, if he spends Rs 10 crore, the tenantwill get the benefits of Rs 5 crore every year. So this is called flipincentive. In this scenario, the builder does not want to spendthe money for the user to get the benefit. However, if things aremade mandatory or a law is passed, builders are willing toadhere to the law. But for a builder, the law should be stringentwhere it is applicable to all; it should be simple with no multipleinterpretations; and this should not add to the list ofpermissions.
What is the way forward for India in the area of energyconservation?In India, buildings are not seen as domains. We have severaldomains such as architecture, civil, mechanical, electrical, etc.With buildings having maximum impact on energy consumptionand global warming, the time has come for us to start looking atbuildings as a separate interdisciplinary area; the governmentshould help educational institutes take buildings as aspecialisation.
We need a long-term sustained effort in R&D, so that we dosolid research and emerge with efficient building designs.Interdisciplinary research is important as the world is movingtowards zero energy buildings now - buildings that producetheir own energy. And we have to take a leapfrog jump here.Today, many villages are connected and many don't have grids.
12/10/2017 Construction World Magazine India | The maximum potential for saving electricity is in buildings
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Instead of putting up the grids, we can go solar and do efficientbuildings. Thus, there is a great opportunity for our country togo to the next level of technology and not follow the path thedeveloped countries have followed.
To share your views on the this interview, write in [email protected]
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