India glass industry lacks ratings, labeling
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“In the United States, buildings account for 73 percent of electricity consumption, 36 percent of total energy use and 40 percent of greenhouse gas emissions,” said moderator Anand R. Jain, who is also manager, Institutional Sales, Saint-Gobain Glass India Ltd., Sriperumbudur, Tamil Nadu. “In India, a tropical country with excessive light and heat, 20 percent of energy is spent on artificial lighting and 35 percent on cooling. Inefficient buildings are making the energy crisis worse.”
Marc LaFrance, technology development manager, Building Technologies Program, Office of Energy Efficiency and Renewable Energy, U.S. Department of Energy, spoke on Research and Development for Zero Energy Buildings and Window Technologies.
“The six Asia-Pacific partners—Australia, China, India, Japan, South Korea and the United States—are working on clean development, energy security and climate change,” LaFrance said. “Electricity consumption in India is expected to have huge increases, natural gas for electricity generation grows at over 7 percent per year through 2030.”
India should not reinvent the wheel but learn from its U.S. partner and consider “jumping” to the next generation of window technologies: highly insulating, low-cost, triple-pane performance, and dynamic, variable solar heat gain control, LaFrance said. India also needs building codes and window ratings and labels, he said. “Building codes won’t be enforceable unless there’s a window rating methodology in place,” LaFrance said.
LaFrance discussed zero energy buildings. “By 2025, the Building Technologies Program will create technologies and design approaches that enable the construction of net-zero energy buildings at low incremental cost,” he said.
Stephen Selkowitz, head, Building Technologies Department, Lawrence Berkeley National Laboratory, Calif., made a video presentation titled Advancing the Use of Daylighting Strategies in Commercial Buildings. He spoke about the characteristics of successful daylighting systems, challenges of daylighting, options for light control, light shelves and smart windows, and integrated building façade systems.
Manish Srivastava, manager, Institutional Sales—North, Saint-Gobain India, spoke on High Performance Coatings.
“There are two kinds of coatings: On-line and off-line,” he said. “On-line is applied on glass during the manufacturing process by pyrolysis of gases, and off-line is somewhat like electrolysis done with an anode and cathode.
“High performance coatings in modern buildings control heat gain, glare and daylighting, and blend the interior with the exterior. Glass and green can go together to create great architecture,” he said.
Bipin Shah, international coordinator for the National Fenestration Rating Council of Silver Spring, Md., discussed Fenestration Design & Role of the Rating System in Promoting Energy Efficiency.
“United States, China and India together consume almost half of the electricity generated in the world,” he said. “There’s a huge need for energy efficiency.
“Why certify and label? To create uniform, accurate product comparison; to verify product performance; to have a common communication tool; and for code compliance,” Shah said. “A level playing field helps consumers and promotes product innovation.” He also discussed NFRC’s rating system, fenestration codes in the United States and the Energy Star program.
Drury B. Crawley, technology development manager, Building Energy Tools, Commercial Building Research & Development, U.S. Department of Energy, spoke on The Power of Building Simulation.
“Building simulation is software that emulates the dynamic interaction of heat, light, mass—air and moisture—and sound within the building to predict its energy and environmental performance as it is exposed to climate, occupants, conditioning systems, and noise sources,” Crawley said. “Simulation is cheaper than constructing the wrong building.”
Crawley cited several glazing studies of glare, thermal comfort in natural and mechanical ventilation, and overheating and thermal comfort. “Simulation is primarily a comparative tool rather than an absolute energy tool,” he said. “In DOE’s low-energy building research, simulation has been shown to be critical for designing buildings and making decisions.”