External shading technology and market perspective in IndiaFrance •2 Billions Euro/yr in Germany-Swiss Building Energy Efficiency Project (BEEP) 16-500,000,000 1,000,000,000 1,500,000,000

Indo-Swiss Building Energy Efficiency Project (BEEP)

External shading

technology and market perspective in India

March 8th, 2019, New Delhi

International Energy Services Conclave 2019 – Energy Efficiency for Business Competitiveness

Pierre Jaboyedoff, Mechanical Thermal Engineer, Associate, Effinart,

Head of the Swiss Project Management Technical Unit of BEEP

First assignment in India in 1981

Effin’ArtThe Art of Energy Efficiency



What is BEEP?

The overall goal of the project is to reduce energy consumption in new

commercial, public and residential buildings in India through Design

Improvements & Building Codes.Indo-Swiss Building Energy Efficiency Project 2

Federal Department of Foreign

Affairs (FDFA)Ministry of Power (MoP)

Bureau of Energy Efficiency

(BEE)

Swiss Agency for

Development and

Cooperation, New Delhi

Greentech Knowledge

Solutions Pvt. Ltd., New DelhiEffin’art Sarl, Lausanne

MoU

Project steering

Project implementation

Building Design:Design and energy monitoring support to building projects

Building Technology:Materials and systems for Energy Efficient Building Envelope

Building Policy:Building codes and bye-laws for energy efficiency at national and state level

Outreach: Training programmes, seminars, site-visits….



Structure of the presentation

1) External Movable Shading Systems, why ?

• Some reasons for the (re-)Introduction of this feature in energy efficient building design

in India

2) Lack of manufacturing in India, import costs far to high, need of the

emergence of a देशि technology and cost

3) Innovation: revisiting old concepts used in India in the past ?

4) Added value (reduces the heat gains across the envelope, allowing to

keep control over daylight in all situations) and does not compete but

complement other technologies like active cooling

5) Case studies

6) The history and market development in Europe at a glance

Indo-Swiss Building Energy Efficiency Project (BEEP) 3



Enlarge the focus on appliances to passive measures to

reduce cooling loads during building design

• Singapore International Energy Agency (IEA) Future

Buildings Forum Think Tank Workshop 2017 «Transforming

cities in hot and humid climates towards more efficient

and sustainable energy use»

4

From the summary of the report after the workshop:With air-conditioning becominga necessity in the tropics, energy demand is expectedto grow at a rate of more than 10% per year. There istherefore an urgent need to rethink about the approachtowards passive design, thermal comfort and the need fordisruptive technologies for the tropics as a response tothe increasing need for cooling. (taken from http://www.iea-ebc.org/strategy/future-buildings-forum)

Internal gains

Transmission across walls

Solar heatgainsInternal blindsExternal blinds

Air change

Swiss Building Code for façade solarprotectionMost stringentin the world

http://www.iea-ebc.org/strategy/future-buildings-forum



Interior blinds

SHGC > 50%

External movable

blinds

SHGC < 15%

Why external movable solar shading has become so important in

Europe ? What is the difference between the internal and external

movable shading systems ?



• Study and testing on existing

external lamella (louver) blinds,

2007 validation of simulation with

EnergyPlus

Switzerland 1979 (pioneering times), 2007



Why is it so important to cut not only direct but also diffuse solar

radiation with external shading ? (example of Delhi climate)

• In highly glazed buildings, solar heat gains

(direct and diffuse radiation) are the main

contributors to overheating !!

• The solar diffuse radiation reaches more than

50% of the global radiation in hot summer in

Delhi when overheating occurs

• Protecting against solar heat gain with

overhangs is not sufficient !!!!!, especially on

East and West facades where it does not work

during summer

• Static shading can only protect partly against

solar gains (SHGC > 40%)

3.47

4.68

6.03

6.86 6.99

6.3

5.42 5.3 5.35

4.98

3.94

3.28

1.4

1.75

2.22.5

33.25 3.2

2.852.6

1.75

1.35 1.4

40%37% 36% 36%

43%

52%

59%

54%

49%

35% 34%

43%

0%

10%

20%

30%

40%

50%

60%

70%

0

1

2

3

4

5

6

7

8

jan

uar

y

feb

ruar

y

mar

ch

apri

l

may

june july

augu

st

sep

tem

ber

oct

ob

er

no

vem

ber

dec

emb

er

Global and diffuse radiation New Delhi

Global horizontal radiation Diffuse Hd/Hg

Predicting monthly mean daily diffuse radiation for India

Indira Karakoti, Prasun Kumar Das, S.K. Singh, Solar Energy Centre, MNRE, New Delhi 110

003, India, Applied Energy, 2012, vol. 91, issue 1, pages 412-425

• Today’s trends in

window to wall ratio

(often >50% in one

room) require the use

of external movable

blinds (SHGC <15%)


Integrated Design Process: Tier 1 – Building Design

Source: BEEP India

In “modern” buildings the envelope is often the main source of heat gain/loss

• Window area has a significant impact on cooling energy use:

Annual cooling energy use (kWh/m2-year)

Window to wall area ratio (%)



Different strategies seen to fight against overheating by

shading


• Ancient external

shading solutions

• Jaipur old town

library

• Old town of

Calcutta

• Shutters

• External fabric

• Gurgaon recent high rise residential

• Curtains inside

• Occupants trying to keepthe heat out

• Rajkot

• Ad hoc external shading

• Nagpur

• External

Bambo

louvers

• Contemporary

shading solutions

• New York

Brooklyn 1920



BEEP National Design Competition for external movable shadings

(→ reducing 15-40% of cooling demand in residential building)

• Selection of 5

laureates →

prototypes

• Testing at

Ahmedabad (CEPT

University, CARBSE)

completed

• Results

• Reduction of solar

gains by a factor 4

with indian designs

→ large potential of

applications

Testing: 2015-2016



Experimental comparative measurement no shading/shading

Two mock-up’s building facades both face the south east (1)

• Real parallel measurement

of two mock-ups

• identical in terms of size and

the HVAC system and lighting

system employed


S.-J. Choi et al. / Energy and Buildings 150 (2017) 328–338 335



Experimental comparative measurement no shading/shading

Two mock-up’s building facades both face the south east (2)


• Measurment

over 5 days

• Up to 48%

reduction in

energy

No shading

Externalshading



External movable shading systems

Trends in Europe pushed by more stringent standards, super insulation and

tightness without efficient solar protection → overheating in European climates

• Swiss code for facade

and Minergie labelled

• External adjustable,

retractable louvers

• Roller blinds

• Fancy shutters


• Passivhaus

• Fabric on a rail

• External adjustable,

retractable louvers

• Roller blinds

• Fancy shutters



• Shutters_external_diaporama_2m_rapid.pptm

• external_blinds_diaporama_2n.pptm

• 20190304_105851.mp4 External lamella blind Swiss Embassy Delhi

• 20190304_110123.mp4 Roller blind Swiss Embassy Delhi

• Storen visual.avi visual presentation Schenker Switzerland


Shutters_external_diaporama_2m_rapid.pptm

external_blinds_diaporama_2n.pptm

20190304_105851.mp4

20190304_110123.mp4

Storen visual.avi



Business of External Movable Shading Systems, some

informations about manufacturs of external retractable and

adjustable lamella blinds

• The European leaders: Griesser and Schenker, Switzerland, Warema, Germany

• The more aggressiveinternationally like Warema to show a high and continuedgrowth (CAGR) of 15 %/yr

• The business of the threelargest external shadingsystems manufacturers in Switzerland and Germany have a total turnover of ~1 Billion Euro/yr

• The business for roller blinds in France only is at presentabout 700 Millions Euro/yrIndo-Swiss Building Energy Efficiency Project (BEEP) 15



Business of External Movable Shading Systems, some

informations (2)

• The external

movable

shading market

is at least as

important or

more in Central

Europe

countries like

Germany and

France

• 2 Billions Euro/yr

in Germany


-

500,000,000

1,000,000,000

1,500,000,000

2,000,000,000

2,500,000,000

Germany France

Order of magnitude of the turnover of the external shading and of air conditioners

Turnover of the external shading (roller blinds and external movable louvers) 2015 (Germany:Association of solar protections manufacturers, France: market search on market of rollerblinds and external louver blinds)



ECBC-R and labels

• Trade off between Window to

Wall Ratio (WWR) and external

shading

• More glass possible if External

Movable Shading Systems

(EMSYS) are used

• Example

• RETV = A *(1-WWR)*Uw * i +

B*(WWR)*Uf * i +

C*(WWR)*(SHGC)effective* i

• Analysis: RETV = 12 (W/m2-K)

with WWR 0.12 → 0.45 (extreme

for a very highly glazed high

end apartment tower)

• Uwall = 0.7 (W/m^2-K)

• Uf = 6 (W/m^2-K)

• WWR = 0.2 → SHGC ~ 0.45

• WWR = 0.4 → SHGC ~ 0.17Indo-Swiss Building Energy Efficiency Project (BEEP) 17

Glazing withleast coloreffectSHGC > 0.27

ExternalmovableshadingSHGC < 0.27



Conclusions

• The general international trends, especially in Europe

• With more stringent building codes and labels like LEED, Minergie (Switzerland), Passivhaus the external movableshading systems become mandatory

• The market is yet to be developed in India

• Advantage

• Reduction of heat gain from the environmnent →reduction peak temperature in non AC buildings

• Reduction of peak demand and energy demand for cooling

• Tremendous potential for various market segments in Indiafor external movable shading systems (on-going marketand technical study by BEEP)

• Low cost housing→ simple shutters, awnings, fabric blinds

• MIG → shutters, awnings, louver blinds

• HIG → auomated modern external lamella blinds

• New push for the market development helped by the application of ECBC-R

• BEEP can help all stakeholders having an interest in the subject




• Thank you
















Ahmedabad preliminary study







Interior blinds

SHGC > 40%

Internal movable blinds

Solar radiation

Reflected solar

radiation

Reflected

radiation

Solar gain

through

the

glazing

Lowering

the blind



External movable blinds

External movable

blinds

SHGC < 12%

Solar radiation

Reflected

radiation

Solar gain

through

the

glazing

Lowering

the blind









• To be added

• Intellicity study of comfort

• Design competition and results and possible

• Importing machines which make the component of blinds

• Retrofit

• Singapore shaded building




Possibilities under BEEP to contribute to the development of

External Movable Shading Systems

• Explain BEEP

• Design competition

• More designs

• Assist technically potential manufacturers




190304 discussion

• Kinds of EMSYS

• Chiks

• External cloth

• Vertical awnings

• Vertical louvers (SAFAL)

• Lamella blinds

• Balcony

• Sliding shutters




Diaporama express ?










Importance of coherence with natural ventilation

• When the shading is on glazing area

covered, opaque shutters or of other

disposition can limit too much the

natural ventilation at night ( 1.5 ACH)


• When the shading is on glazing

area covered, shutters with

louvers or louver blinds or

additional ventilation openings

can increase by a factor 10 the

natural ventilation at night (15

ACH)



Diffuse radiation in metros like Delhi

• With particle concentration of various levels, the solar radiation is not mainly

direct especially during the hot season


New Delhi_ISHRAE_2014\New Delhi_ISHRAE_2014.epw

Other sources for vertical diffuse and total



BEEP Context (Global) – Climate & Health


• In the hot and humid regions, the challenge to achieves thermal comfort in buildings will worsen due to increase in temperatures and humidity.

• Air conditioning to account for a large share of increase in CO2 emissions.

• Energy Efficient Building Design would be key to achieve thermal comfort and reduce energy for air conditioning













Documents

External shading technology and market perspective in IndiaFrance •2 Billions Euro/yr in Germany-Swiss Building Energy Efficiency Project (BEEP) 16-500,000,000 1,000,000,000 1,500,000,000