When we discuss on life of a façade two things come to the mind of the designer one Low Maintenance materials & other Maintenance of the façade.

We could see lot many building across our vicinity nicely maintained cleaned properly at regular intervals & few buildings in shabby state where Composite panels are broken, Top hung windows are on verge of collapse, Silicone Joints failed & lot many issues within a facade

 

 Expectancy of Façade Life:

 Any normal building façade is of most importance as it is the Link between Exteriors & Interiors. Lot many designer forget to consider Basic properties of Raw materials they wish to use on the façade. Few things needs serious thoughts as under

  • Climate of the Country Where Façade is designed for.
  • Expected Life of Raw Materials used like if Aluminium is used then what would the life of coating the member, the UV detoriation rate.
  • System behavior & performance
  • Cleaning rate of the building.

 

What is cause of failure & how we can reduce failure rate? 

  • Materials abuse is one of the most important causes of failures.
  • No technical selection process of vendor is followed; only commercial rates are compared leading to poor quality raw materials being used.
  • No prior testing of raw materials is done in the laboratories.
  • Quality Installation teams are not properly trained for fixing façade & handling expensive materials.
  • Quality expensive systems are commercially disapproved for short term gains.
  • Building Interiors spoilage risk & cost are unseen for.
  • There is a feeling in the market that any form of sealants are protecting your from any weather conditions a most important myth in the industry.
  • More time spent on commercial costing & less on technical evaluations of raw materials

 

How can we move ahead with a positive frame for a quality Façade? 

  • Ignore verbal confidence of any one as these leads to some unforeseen risks which he might be ignorant of.
  • Seeing believes, Insist for raw materials testing in leading labs in order to ensure your building life.
  • During Design phase a lot of focus must be given on raw materials mostly Open & Closed Joints behavior over 25 years to 30 years, one needs to ask the vendor to conduct accelerated testing of his materials.
  • Focus on façade cost & foresee the damage cost it can incur in event of any failure so that you can have provision for pre façade testing.
  • Quality audits on site during installation are most important aspect of any façade. If not done properly might be the major cause of façade problems
  • Test certificates of raw materials is Ok, but we need to move a little further by getting raw materials retested randomly at a joint cost as it is saving you more than the vendor.
  • Pre tested systems might help you to larger extent for a quality façade as behavior of performance is known.
  • Make a serious note & differentiate between Raw materials testing & façade testing these two are different tests altogether. One is more oriented to Life of raw materials & other is to joinery, Air leaks, water leaks etc.

  

Conclusion:

Life of façade depends on all above factors but one most important factor is Willingness to do all the above without which Façade Improvement is a mere Fallacy.

                                                    

By Prashant Thakkar

efacades@gmail.com

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NzeB- Have you heard about this?

Nearly Zero Energy Buildings is the target of European Building Policy, where by end of year 2020, all the new constructions should be consuming as minimum energy & could use more renewable sources.

 

How to achieve  “Nearly Zero Energy Building”

Two major factors will help you achieve

  • Adaptive Facade on buildings.
  • Onsite demand with renewable energy generations.

 

Adaptive Facade on Buildings

Adaptive façade is an intelligent façade which differs from normal façade as it has various variable devices that helps to act as climate moderator.

By using this façade we provide a building an ability to accept or reject energy from external environment & in turn reduce the excess energy required to keep a comfort zone internally.

How an Adaptive Façade help in creating a nearly Zero Energy Building.

  • Selection of appropriate design based on building typology & Climatic location.
  • An ideal adaptive façade is the one which is able to minimize the total energy consumption of indoor space by means of adapting thermo-optical properties to varying outdoor/ indoor environmental studies like Solar Radiation, Air temperature, Wind velocity, Internal Loads & various factors effecting the façade.
  • Extensive research being done & a 365 days energy absorption through the façade is studied on micro level basis to reduce the net heat gain / or to increase the heat gain based on climatic location.
  • This study also studies the micro consumption of energy room wise in order to assess performance of the façade.
  • Evaluation of adaptive façade is performed by means of minimizing energy consumption of building.
  • There are adaptive ceramic frittings which moveable graphical pattern that can modulate its transparency to control light, heat gain & aesthetic looks into the façade.
  • Total Energy Consumption = E heating + E cooling + E lighting.

 

Onsite Demand with renewable Energy generations

Onsite supply can be boosted with use of optimal Solar PV module, where in our last article we covered a recent invention of glass highly effecient than conventional solar module. These methods would boost energy productions without effecting fossil fuels & thus minimizing Co2 emissions & other green house gases effecting the earths global warming.

 

Conclusions-

With energy crisis across globe & an intent to reduce carbon emissions a lot focus is driven on saving energy as it is always said in simple words

“ A unit Saved is Unit Earned”

 

For more write to – info@glazingshopee.com

 

Source-

www.studiocomi.com

www.powerhouseeurope.eu

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Today India is facing a challenge to meets up its growth module & energy crisis with high cost of Fossil fuels across the globe. It is always said

 “A unit Saved is unit earned”

With large number of Energy consumed is the building sector of the country in terms Commercial offices, Residential Building, Hotels, and Malls.

 

How can Efficient Glass save the Units :

  • Conduct a proper study about your building by doing a proper Sun path Analysis, Day Light Analysis, Energy Analysis.
  • Find out efficiency ratio of HVAC consumption Vis a Vis Glass used on a façade.
  • Identify Various Glass Colors & their properties needed Area wise.
  • Also know Whether a Double glass would benefit your façade or not.
  • Find Out different Sun shading Devices you can use on the façade & their efficiency with proper backup calculations.
  • Conduct Simulation studies if you need more detailed Approach to understand the façade properly.
  • Understand the Concept of Net Heat Gain in the Building.
  • Not Allowing heat from outside leads to less HVAC loads.
  • Know the U value factor of the Glass which is the rate at which Glass transmits heat out which is mostly faster with temperature difference between outside & inside.
  • Conduct proper Shading studies right from Shading co-efficient of glass to shading devices needed to Allow Light inside the building.

Conclusion:

These mere small studies help you in contributing to the Nation, so please do it however small façade it may be a single Unit Saved is Single Unit Earned

                                                                                         By Prashant Thakkar

                                                                                         efacades@gmail.com

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Sun Path Analysis:

Day by day with high rise structure coming up, it is becoming very important study related to effect of Annual Sun Path over the façade. Sun path analysis generates the report of having a shadow on the glass to cut the glare & have a shade so the occupants are at ease sitting next to façade.

Analysis of impact of sun with respect to site conditions also gives a report on daylight coming inside the building so the designer can understand amount of illumination of internal lighting needed.

Position of sun has two angles Altitude & Azimuth.

Altitude is angle between horizon & location of sun along X,

Azimuth is angle with respect to horizon measured to ease or west along Y.

Sun path study helps in reducing heat gain inside the building in turn reducing Heat Loads so less capacity HVAC* systems.

 

During early days Architects always relied on shading chhajjas to cut the heat on the building interiors using shading strategies to give comfort to the occupant. Shading has its impact based on outer temperatures, climatic conditions & orientation of façade vis a vis Sunpath.

To summarize this study is most important for better efficiency of Façade in terms of reducing heat loads, Control Glare within the buildings & Plan the lighting systems of building.

HVAC*: Heating, ventilation and air conditioning.

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The Melting Highrise

Recently I read an article on a building façade constructed in London with a concave South face façade, had a major issue as this shape of façade was melting things at the ground, surprising how did this happen & what went wrong in this façade.

 

( Source www.dailymail.co.uk)

The major issue with this façade was the design of its concave surface resulting the sun rays travelling till the ground with high heat intensity focusing at particular point. The design error in terms of shape resulted in intensified the solar rays into one focal point through the number of panels. Surroundings had lot of issues with carpet burning, certain plastic parts melting on the parked cycles, cars at one particular point & on particular day.

Moving further into this topic even today there are many buildings in India where the reflection of glass falls on the road causing lot of inconvenience to the pedestrians. Engineering has solutions for this issue where a detailed study of façade needs to understand the geometry of façade.

 

There is a study of façade fluidics thermal energy intensity analysis which helps to understand control the façade materials temperature in relationship to climate & orientations. One might have observed in certain areas trees near façade building might have burnt leaves or dead leaves this in another aspect where the glass acts as mirror & the direct solar light & heat are transmitted onto the trees & surroundings.

To increase the stored thermal energy within the glass substrate one has to conduct a deep insight study of materials throughout the 12 months cycle of sun travel path & behaviour with orientation of the façade. Fluidic study has a further impact on the surface temperature of the façade materials & their heat transfer behaviour around the surroundings.

Major factors one has to observe during a design

  • Thermal conductivity of the façade materials.

  • Orientation of the façade to sun.

  • Heat dispersions patterns & surroundings of the façade.

  • Heat capacity of the materials & fluidic flow passage.

To know more on this topic & conduct a study write to

admin@efacades.com

contact : 08652446321

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Glass plays an important role in modern façade with considerations of Appearance, Looks, shade, thermal comfort, safety, availability & hence a right selection is crucial part of façade design.

At glass experts we are expertise in glass selections issues we plan our solutions right from

  • Façade Design stages
  • Constructions stages
  • Post Execution Investigations

 

Design Stages:

  • Provide FEA analysis reports of Glass for stress & deflection analysis & select the glass based on ASTM standards.
  • Provide Sun path Analysis of your façade based on your site conditions.
  • Provide day light & illumination reports for appropriate comfort levels inside the building.
  • Provide Solar Heat gain reports & shading studies to determine how much heat gain can be saved.
  • Provide Thermal analysis reports for complete façade u values of frames & glass.
  • Provide specifications based on the applications in façade

(Façade Glass – HS Mostly preferred, Toughened & Laminated).

(Canopies – Laminated Glass)

(Skylights – Laminated Glass)

(Railings – Laminated Glass)

  • Provide reports considering green Building norms, GRIHA norms, and LEED norms for those who want green building aspects to be covered for facades.
  • Provide acoustic study reports based on the site where we use a Decibel meter to record the sound levels at respective floors & provide our clients with better acoustic solutions in Windows & Facades.
  • Provide Report on Return on Investment done for a value added product.

 

Construction Stage:

  • Quality Audits of Glass processing with respect to standards like processing quality reports, Physical glass inspection reports.
  • Conduct physical tests for samples & specimens.
  • Provide Quality process guidance for DGu’s right from byte size to airspace, desiccant selections etc.
  • Verify code / standards requirements.
  • Onsite handling & stacking guidance & inspection reports.
  • Installed Quality checks as per standards.
  • Guidance on Loading & unloading very heavy & big jumbo sizes glasses.

 

Post Execution Investigations:

  • Conduct report analysis on DGU failures & breakages.
  • Study & solutions on delaminating of laminated glass.
  • Verifications of technical parameters like solar heat gain Coefficient, Light Transmittance & thermal testing.
  • Reports on random or spontaneous breakages.

We believe modern facades will have to cater to these issues & find out solutions well in advance in planning stages rather than watch helplessly at the finishing stage of the project.

 

Some common Glass types used in facades

Annealed Glass –

Also called float glass which can be Cut, machined, drilled, edge polished & processed as per customer needs.

 

Heat Strengthened Glass (HS)

Heat-strengthened glass is a processed glass subjected to heating & cooling cycle & is 2 times stronger than annealed glass. It has resistance to thermal loads. It is not safety glass when broken breaks like tempered glass. Widely used for façade applications as due to low core tensions in HS glass this rarely breaks spontaneously.

 

Tempered Glass or Toughened Glass

This glass is 4 to 5 times stronger than the Annealed Glass. Mostly used in spider gazing applications in India. This is also called safety glass as it breaks into smaller pieces when broken. Susceptible to failure due to NIS impurity.

 

Laminated Glass

Lamination is a popular method of creating a maximum safety glass since when broken the pieces of glass stick together and don’t fallout. This is combination of 2 or more glasses with PVB (Polyvinyl Butyral) interlayer. 2 or more glasses are bonded together which could be annealed, Hs, tempered with a process of cleaning, application of PVB , Autoclaving, unloading & edge sealing. End product is transparent and preserves aesthetic appearance.

** (Various other lamination processes are available).

 

Double Glazed Units

Most widely used glass in facades in Vision panels to control heat transfer in the façade.  Also called Insulated Glass where 2 panes of glass are separated by a spacer made of metals. Ideal space between 2 glass is 12mm. IGU’s are manufactured in a clean environments with polyisobutyl applied to face of the spacer to bond both glasses. Spacer is filled with desiccant which removes traces of humidity from the air so that no water appears on inside face of the glass. The heat loss due to convections is eliminated. DGUs also help in less deflection due to box type constructions & have acoustic insulating properties. Life of DGU depends on raw materials used and ideally they have life of 10 to 20 years as per norms.( For more details contact us).

 

By Prashant Thakkar

                                                                                       efacades@gmail.com

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