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What is a Green Building? A green Building revolves around the conservation of natural resources;provides human comfort, safety and productivity. This approach results in many tangible and intangible benefits.
Sustainability The biggest benefit is to create a sustainable world.
Operational Savings Green Buildings consumes fewer resources than conventional ones. This may come at an incremental cost but gets paid back over a short period of time and it may even become cheaper.
Occupant Health and Productivity Working in an environment with access to daylight and views provides a connection to the exterior environment and boosts occupant health and productivity.
The American Institute OF Architects(AIA) have started to accumulate evidence that suggests that access to daylight and views can positively influence productivity. Satisfaction and physical health for building occupants means a higher quality of life. For the employers of these occupants, this means higher profits. Green Buildings ensure that waste is minimized at every stage during the construction and operation of the building resulting in low costs to all from a simple commercial complex to large development projects. As more developers, owners, consultants architects and vendors are participating in the green building movement, it is now starting to gather rapid pace in the country. The combined effort of individuals and organizations to move towards green buildings is having a remarkable effect and this can be seen in innovative constructions across India.
Some of the features of a green building are: Minimal disturbance to landscapes and site condition. Use of recycled and environment friendly building materials. Use of non toxic and recycled/recyclable materials. Use of energy efficient and eco-friendly equipment. Use of renewable energy. Effective operational control with building management systems. Environment protection. 1
Glass use in buildings India is witnessing tremendous growth in infrastructure and construction sectors. As these sectors grow rapidly, preserving the environment poses a lot of challenges and at the same time presents opportunities. Glass has come to be the preferred choice of architects for building envelopes and interiors. Glass is unmatched when meeting requirements of form, function and beauty. Transparency, day lighting, spaciousness and liveliness have driven extensive use of glass in buildings. With more glazing, there remains the challenge of reducing building energy consumption and conserving natural resources. The construction sector needs to play a vital role in contributing towards environmental responsibility. The green building movement in India is a step in this direction, to minimise the negative impact of buildings on the environment.
Glass Coatings In facade glazing, coatings on glass have proved to be an efficient way of reducing energy consumption of buildings. Over the years, two technologies have dominated architectural coated glass manufacturing.
Chemical Vapour Deposition(CVD) The coating material gets deposited on the glass surface, when it is made to pass as chemical vapour over the glass surface when the glass ribbon exits the tin bath of a float glass production line. Since the coating is done on a float glass production line and at a high temperature, the process is more commonly referred to as on-line process, pyrolytic process or hard coat process. The coating material fuses with the glass and forms a very durable coating. However, the constraints of high temperature, space inside the tin bath and ribbon speed, limit the choice of materials for the coating and consequently, the performance of the glass.
MagnetronSputter Vacuum Deposition(MSVD) Coating material is placed in the machine in the form of a cathode above the glass that is moving through it at constant speed. Positive gas ions from an ionised noble gas(plasma) strike the cathode with high energy and dissociate atoms from it. These are then deposited on the glass surface below. The process being distinct and independent of the float glass production line with coating temperatures close to ambient, it has popularly come to be known as Off-line process or soft coat process. The freedom in coating line construction and the controlled process environment, allow many number of layers of different materials to be deposited on the glass, forming a coating stack. A wide range of materials, including pure metals can be deposited to achieve close-to-ideal of maximum daylight with maximum energy savings.
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Towards Greener Buildings Minimising adverse environmental impact, has become and will continue to be the global focus of development. Built environments contribute to a major share of our energy consumption and consequently to environmental damage. Building sustainable living and work spaces with minimum energy foot print is the need of the hour. In a cooling dominated climate, the chase is increasing daylight while cutting off energy ingress into conditioned space through building envelopes.
Light vs Solar Heat Gain Conundrum Allowing more daylight into conditioned space has the corollary of allowing more solar heat gain. High performance, spectrally selective coatings on glass today, are challenging this corollary and are inching closer to achieving the ideal “visible light tower� curve of the solar spectrum.
Sezal Proposition- Fresca High Performance Sezal brings Fresca, a German technology, high performance, insulating glass series, with new generation magnetically enhanced cathodic sputter coated glasses from arcon Flachglas Veredlung GmbH & Co. KG ushering the age of Formula One performance in architectural glass. The structure of the deposited layers in a coated glass is extremely vital for achieving the desired performance levels. The pulse sputter technic employed by arcon represents a significant breakthrough in the large area coatings on architectural glass. The high strike energy of the metal atoms in this process ensures the formation of dense, homogenous and continuous layers with excellent photometric and radiometric properties. The carefully selected coatings and the technology perfected over three decades ensure excellent bonding to the glass substrate, durability, chemical and abrasion resistance. The multilayer, multi functional coating stack offers superb spectral selection resulting in fantastic energy savings. Fresca is the ideal solution to green built environments.
The Performance Advantage Excellent daylighting with very high solar energy blocking. Low solar factors even with clear substrates. Certified for green buildings Wide choice in appearance and performance Close to natural colour rendering of views Superb aesthetics with German processing. 3
Just one sputter coated glass in IGU configuration
FRESCA The USPs of Fresca OCCUPANT COMFORT When building interiors offer copious daylight and views of the outdoors, the people inside thrive. Workers are more productive, students learn better, and patients heal faster. Artificial light, glare and overheating have the opposite effect.Fresca enables the embracing of natural light and connection to the outdoors while preserving the comfort of indoor space. Occupants enjoy all the benefits of sunlight, without the drawbacks that come with it.
IMPROVED ENERGY PERFORMANCE Fresca minimizes the use of energy and expenses associated with operation costs of a building. It is estimated that savings generated with such facades can amount to almost a quarter of the total expenditure.
SUSTAINABILITY
If sustainability is a requirement, Fresca provides it. Buildings can use smaller, more efficient HVAC systems, dramatically reducing energy consumption. A low carbon footprint should be factored in the construction materials, as they are a particularly big concern while striving for sustainable construction.
LEED Gathering LEED credits by maximizing the use of natural light in buildings for the well-being of the occupants makes Fresca an environmentally preferable product for LEED building construction.
IDEAL APPLICATIONS OF FRESCA Leed rated building facades Energy conservation projects Hotels
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Sunshine Tower Location: Mumbai Architect: Raja Aederi
arcon Flachglas Veredlung GmbH & Co. KG was founded in 1980 by the two pioneers of the insulating glass technology Alfred Arnold and Wilhelm Conzelmann. Since commencement of MSVD coated glass production with the first coater in 1981, arcon has come a long way today with two manufacturing locations at Feuchtwangen and Bucha. The company has 260 employees and the annual turnover exceeds â‚Ź 50 million.
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Sezal Glass Limited Sezal Glass Limited (SGL) is the flagship company of the Sezal group, a first generation business, with interests in glass, realty, insurance, retail & media. As a top glass processor in India for over a decade SGL has a sound, extensive infrastructure to provide international quality glass solutions. SGL uses state-ofthe-art European technology. It offers the best quality glass products across a wide range of applications. SGL offers customised glass solutions and expert advice on glass use in buildings. The company has 250 employees and has provided leading edge glass solutions to over 600 projects in India and overseas.
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H.C.C. Corporate Park Location: Mumbai
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World Trade Center Location: Bengaluru Architect: HOK (USA)
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Glass Spectrophotometric Performance Terms Light Transmittance(VLT/LT)
The light transmittance, expressed as percentage, quantifies the directly transmitted portion of radiation in the visible light range from 380 nm to 780 nm wavelength, in relation to the light sensitivity of the human eye and the standard illuminant type CIE D65.
Light Reflectance(LRI & LRO)
The light reflectance, in percentage, is the proportion of the visible light that is reflected by the glass. The light reflectance to the inside and to the outside are distinguished as internal / indoor reflectance and external / outdoor reflectance respectively.
Solarfactor(SF)
The solar factor of glazing is a measure of the total energy transmitted through the glass expressed as percentage of the total solar radiant energy striking the glass. It is the sum of the portion of radiant energy entering by direct transmittance and the portion of the energy absorbed and re-emitted by the glazing to the interior space.
Shading coefficient(SC)
It is the ratio of the solar factors of a glass and 3 mm clear float (87%) and is used as a performance comparison. The lower the shading coefficient number, lower is the amount of solar energy(heat) transmitted through the glass.
U Factor / U value Thermal transmittance across glass due to environmental differences between outdoor and indoor air, is expressed by its U value. This is the rate of heat transmission per unit area per unit temperature difference between the exterior and interior surfaces of the glass. The values given in the performance tables are centre of glass U values. The lower the U value, lower is the heat transmitted. It is expressed as W/sqm.K or Btu/h.sqf.oF 1 W/sqm.K = 0.176 Btu/h.sqf.oF 1 Btu/h.sqf.oF = 5.678 W/sqm.K
Direct Energy Transmission(DET): This is the percentage of the total energy of the solar spectrum comprising ultraviolet, visible and near-infrared energy that is transmitted through the glass.
Energy Reflection: (E.R.): This is the amount of solar radiation reflected by the glass, expressed as percentage.
Energy Absorption: (E.A.): This is portion of the solar radiation absorbed by the glass in percentage.
Relative Heat Gain: (RHG): RHG, expressed as energy per unit area, is the total heat gain of the conditioned space due to a combination of solar radiation and indoor/outdoor temperature differential for a specific set of conditions. RHG in W/sqm = (630 W/sqm X SC) + (8 K X Summer U value W/sqm.K) 1 W/sqm = 0.317 Btu/h.sqf 1 Btu/h.sqf = 3.154 W/sqm
Figures given are as per EN 410 and DIN EN 673. Standard conditions considered are sun elevation angle of 30o above horizon at right angle to the facade; glass surface internal and external heat exchange coefficients of 8 & 23 W/sqm.K respectively and ∆T 15 K.
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Glass Spectrophotometric Performance Terms
WATER WIND SKY
EARTH FIRE
SEZAL GLASS LTD. 201/ 202, Abilasha, 2nd Floor, S.V. Road, Kandivali (W), Mumbai - 400067, INDIA. Tel: +91-22-28633383/84/85/86 | Fax: +91-22-28633389/90 Email: customercare@sezalglass.com | www.sezalglass.com
Indian Green Building Council
Member IGBC