Green goes global

Energy efficiency takes center stage
February 1, 2007


International Glass Technology Seminar & Trade Show in India
Going green was the main theme at the 4th International Glass Technology Seminar & Trade Show in India. Held at Pragati Maidan, New Delhi, the trade show ran Dec. 8-10 with 21,600 total attendees, 8,100 more than last year.

Seminar sessions on the first day were dedicated to green architecture, emphasizing the importance of energy-efficient structures. The day’s speakers explained how a diverse range of glazing products can help achieve green goals.

“We need to focus on techniques that minimize environmental impacts, reduce energy consumption and contribute to health and productivity,” said R. Subramanian, director of operations, Sejal Architectural Glass Ltd., Mumbai. “Spectrally selective glazing is ideal for green buildings. Also, use inclined glazing, external shading, light shelves and north lighting.”

Arthur Millwood, technical and training manager, Emirates Glass LLC, Dubai, spoke on the use of sputter-coated glass in green buildings. “Air conditioning is expensive and can comprise up to 30 percent of building cost over the life of the building,” he said. “The greatest contributor to heat gain in an air-conditioned building is through the fenestration. Glass is highly transparent to directly transmitted solar energy but is relatively opaque to the longer wave energy accumulated in the room which cannot escape back to the exterior as fast as the incoming solar heat.”

To overcome this problem, permanent solar control metallic reflective materials must be mechanically deposited on the glass, Millwood said. This is done through two technologies: pyrolitic and magnetic sputtered vacuum deposition. Pyrolitic glass is low-emissivity, durable, provides solar control, can be transported, stocked, tempered, curved and double glazed after the coating process, but it offers limited range of coatings and substrates. MSVD, however, offers an immense range of coating options on a full range of substrates, he said.

Narelle Skinner, technical service manager, Construction Industry Asia, Dow Corning Australia Pty. Ltd., discussed the green properties of many silicones. “Structural silicone is a continuous flexible anchor,” she said. “It is durable, energy efficient, thermal, air and water resistant, non-hazardous and non-allergenic, and low maintenance. It provides the best solution for green buildings.”

Other green seminar topics included the solar control benefits of laminated glass and the thermal insulation attributes of insulating glass units.

The second day of seminars focused on energy efficiency.  “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.

“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,” LaFrance 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.

To read more about the show, click here.
Click here for more information on the Indian glass industry.