1. Building Envelope Design & Energy Optimization
Sayudh Ghosh
Shibaprasad Bhattacharya
Institute of Engineering & Management, Kolkata
Introduction
Methods
Results Conclusion
References
Earthen pots: Heat conduction through a
materials can be lowered in several ways
by using insulating materials such as
paints, tiles, or by increasing thickness
using air cavities etc. We used a simple
principle of air cavities through
earthen pots on the roof surface, to
achieve thermal comfort. In principle, use
of cavities is similar to use of a insulating
material. If an air space is left between two
layers it acts as a barrier to heat transfer.
Through earthen pot insulation the cost of the
ceiling treatment is reduced by 160 rs per sq
ft. This in return reduces the work load on the
AC’s for cooling(in tropical climates) and the
heaters for warming(in temperate climates).
Solar paneling on the Windows (transparent)
and outer walls increases energy efficiency
further.
.
The initial cost i.e. the cost of setup may be
high but in the long run the modifications
turn out to be beneficial as they save about
22-25%[1]
of the usage of artificial energy
over general buildings
((
Earthen pots are being installed in roof
surface
[1] Industrial visit to and cost figures
collected from : ESDEE
ENTERPRISES, Kolkata
[2] Building Envelope Design Guide –
Introduction by Chris Arnold, FAIA,
RIBA on World Building Design Guide,
last updated on 06-01-2009
[3] Building Envelop design Guidelines
published by Climate Tech box on April
2011
[4] Technology Roadmap- Energy efficient
building envelopes by International
Energy Agency IEA on 2009
[5] ASHRAE (1989).
ANSI/ASHRAE/IESNA Standard 90.1-
1989 Energy Efficient Design of New
Buildings except Low-Rise Residential
Buildings. Atlanta, GA: American
Society of Heating, Refrigerating and
Air-Conditioning Engineers, Inc.
Old New
2800000
2850000
2900000
2950000
3000000
3050000
3100000
3150000
Type of Envelope
0
200000
400000
600000
800000
1000000
1200000
1400000
1600000
Year
Cost (Rs) vs Year
The overall cost estimation after 15
years
Transparent luminescent solar
concentrator (TLSC). The TLSC
consists of organic salts that absorb
specific non-visible wavelengths of
ultraviolet and infrared light, which they
then luminescent (glow) as another
wavelength of infrared light (also non-
visible).
This emitted infrared light is guided to the
edge of plastic, where thin strips of
conventional photovoltaic solar cell
convert it into electricity.
Transparent Luminescent Solar
Concentrator
Building Envelope is the the separator of
exterior and interior environment of a building.
The basic components of a building envelope
has been shown below:
With the advancement of the technology the
function of a building envelope has also been
evolved and advanced. It not only protects the
building from outside environment but now
also takes care about maximum energy
optimization and general aesthetics
surrounding it.
So while designing the envelope it is
necessary to keep in mind the cost and
energy optimization which are the governing
parameters of an envelope.
Building envelope design is primarily a
balance between the cost of materials and
the performance required.As discussed
above if Earthen pot and TLSC are used
in Building envelope then the total heat
load and thus electricity cost can be
reduced to some great extent in long run.
As the design is mainly based on the
average climate of India so these can be
hugely implemented in India. With
following the methods discussed, Modern
India can surely move one step forward
towards achieving 100% energy
optimization in Building envelope.