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Energy-saving windows for high-rise residential buildings

Post Time:May 04,2016Classify:Industry NewsView:367

India is currently experiencing one of the fastest growth rates in high-rise buildings, particularly in the residential sector.  As a result, energy demand is expected to rise further in the coming years due to the combined growth of certain factors: population, urbanization, GDP, and consumer purchasing power. This, in turn, will lead to a dramatic increase in the demand for improved domestic comforts which will further lead to an increased demand for energy.


China Glass Network



Today, residential buildings that use more energy to stay cool are a major cause of unnecessary carbon emissions. For a builder, one of the biggest challenges when constructing a high-rise residential building is to ensure low energy consumption while providing a comfortable indoor environment for the occupants. Can the two be achieved concurrently?


Of course, they can! By encouraging greater use of solar control glass for windows. A good solar-control glass is designed to reduce or prevent unwarranted solar heat from entering the building without sacrificing a comfortable environment for the occupants.



China Glass Network



According to a report published in September 2014 by Global Buildings Performance Network (GBPN) titled Residential Buildings in India: Energy Use Projections and Savings Potentials, residential buildings are responsible for 22%* of the total energy consumed in India. Among the main factors that contribute to this energy consumption are:


Air-conditioning / heating

Artificial lighting


As windows contribute to a significant portion of the heat transfer in a building, the choice of glass plays a vital role in the total heat gain of the building. When choosing a glass for windows, a number of factors should be considered including, solar control, light transmission, color, sound insulation, safety properties, aesthetics, and thermal insulation. India being a tropical country with soaring temperatures in the summer, reduced solar glare and heat gain, transparency, and a comfortable indoor environment, are some of the primary concerns for architects and building occupants.

Sparkling Ice (ST 167), a variant of the Antelio-Plus range of glass from Saint-Gobain Glass, has been designed keeping these concerns in mind. With escalating energy costs, the superior benefits of Sparkling Ice certainly shine brighter.


Benefits of Sparkling Ice:

18% reduction in direct heat gain

Significant reduction in daylight glare

33% reduction in UV transmission

Reduction in  the consumption of air-conditioners

A uniform and sparkling building façade


Sounds ideal, doesn’t it? And it serves the two-fold objective of the builder – ensure low energy consumption while providing a comfortable indoor environment for the occupants. A win-win for both! Now, let’s get down to brass tacks.

Let’s assume the following costs and figures:


Flat area in sq. Ft.

Floor area per flat is 1800 sq. ft.

Window / glass area is 150 sq. ft.


Builder’s selling price

Rs. 3500 / sq. ft.


Costs – Clear glass Vs. Sparkling Ice (ST 167)

Clear glass basic price is Rs. 40/sq. ft.

Sparkling Ice ST 167 basic price is Rs. 70/sq. ft.


The difference in price is Rs. 30 / sq. ft.

The builder needs to make an additional investment of Rs. 4500 in the case of ST 167, which means an increase in investment of Rs. 4500/1800 = Rs. 2.5 / sq. ft.

When he finally decides to sell the flat, his selling price will increase from Rs. 3500 / sq. ft. to Rs. 3503 / sq. ft.


What’s in it for the house owner?

Lesser load on the air-conditioner

Increased comfort for the occupant

Interiors such as curtains and furniture are protected from fading

Increased savings in energy bills

A superior aesthetic appeal


China Glass Network


Reference for statistics

* Residential Buildings in India: Energy Use Projections and Savings Potentials report, published by Global Buildings Performance Network (GBPN) in September 2014. 


Source: www.glassisgreen.comAuthor: shangyi

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