Solar Roofing Tiles

with incorporated

water tube

Thermal recovery of solar radiation.

Examples of coverage in tiles. This is

the Langres Cathedral located in

France.

The Cathedral Saint Stéphane , in

Vienna, Austria.

Cover of a typical house in the

Mediterranean country, with channel

tiles.

These roofs are part of our cultural and

historical heritage. They are aesthetic and

well protected by a sustainable and

secular component, clay tile.

Different collector systems are now able

to recover thermal energy radiated by the

Sun.

They are not very aesthetic, and their

manufacturing need expensive

materials, a lot of time and energy.

Main of them are tubular collectors

and flat plate solar collectors.

An other solution can work preserving

aesthetics of existing buildings.

It is a very low cost system, using clay

tiles as thermal collector.

My target was captation of the

heat existing between tile and roof without any visible system

The system I have invented can work

with all standard pattern tiles

The first prototype mold I have

engineered

It is a very low cost system, using clay

tiles as thermal collector.

Molding clay in the first mold i have

done

Removal of the first prototype tile

New heat recovering profile fitted

under a mechanical tile

Now, prototype mold can be created

Water is heated by contact with the specific

profile of the tile, and the heat staying

between tile and insulation of the roof.

Water

tube

Tile

Grooves

A patent has been given (in year 2010) to Frédéric Marçais

Install the roof tiles…

Externally, the roof looks like an ordinary tiles cover.

Recover Energy.Once the roof completed, it is impossible to see if a heat recovery system

is working under the tiles.

Tiles are laid upon the tube (3) for heat recovery. They

are fitted on a specific base (7).

Hydraulic heat collector network (3) is laying under the

tile.

Contact between the tile and the

tube

Contact with the tile is

sometimes uneasy…

But we’ll see about that

later…

Craft achievement of the

prototype.

1 M²

2010 Salon international des

inventions de Genève…

…Organised with agreement of theWorld

Intellectual Property Organization (wipo)

Gold medal for Frédéric Marçais

This is gold médal

Experimental

FacilitiesTo evaluate the performance of the

system, a prototype installation of one

square meter was completed.

Overview of the laboratory of

Brétigny-sur-Orge.

Hydraulic facilities, thermostatic

water tanks

Thermal performance tests were

conducted by the University of Évry

for several months.

Main purpose was evaluation of the

performance of this tile modified for

heat recovery.

Installation can also evaluate

performance and behaviour changes

in variable environment

(sun, heat, water flow, etc)

The simulation device for thermal

radiation.

Testing facilities created and used by

Professor Ayoob and Michael

Germant during the campaign.

The one square meter patented roof tiles is

tested according to different levels of solar

radiation. Here: 370 W/M² and 740 W/M²

0.000

0.100

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0.600

0 5 10 15 20 25 30

rendement

T entrée (°C)

740W/m²

0.000

0.100

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0.300

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0.600

0 5 10 15 20 25 30

rendement

T entrée (°C)

370 W/m²

Changes flow are carried out inside the collector tube. Rate

of one liter per minute (up) and three liter per minute

(down)

0.000

0.100

0.200

0.300

0.400

0.500

0.600

0 5 10 15 20 25 30

rendement

T entrée (°C)

qm= 3 L/minute

0.000

0.100

0.200

0.300

0.400

0.500

0.600

0 5 10 15 20 25 30

rendement

T entrée (°C)

qm=1 L/ minute

A lot of levels of solar flux and flow were tested.

Behavior of tile panel was

tested, working with different solar

insulation, water flow and water

temperature intake.

The current system of Solar tiles is

cheap, easy to produce locally, and

simple to use.

Efficiency of the prototype tile was

measured around 7-20 %, with

possibilities to reach 30% after

optimization.

Presentation of the performance datas of

the system.

0.000

0.050

0.100

0.150

0.200

0.250

0.0000 0.0010 0.0020 0.0030 0.0040 0.0050 0.0060 0.0070 0.0080 0.0090 0.0100

(T*-Ta)/i (K*m²/W)

RendementRendement

Linear (Rendement)

This view shows theorical solar yield curves of the

international chart F ((Tm-Text) /i) = r.

The patented tiles are compared with conventional

solar collectors .

Efficiency of the patented tiles (blue points) can be easily improved to approximately 30 %

Tiles have a large thermal inertia.

The curve shows evolution of temperature changes

over time.

Tiles will provide heat after sunset.

The system help easily heating building

installation in springtime, summer and

autumn.

It is possible to fit - at very low cost - a

very large surface of the roof.

The materials used are sustainable

, with a very long life cycle.

Recycling is cheap and easy.

Example of use: hot water

preheater

Prospect

developmentSeveral modifications are possible to

improve the recovery system.

The first way is to improve

contact between tile and

heat collector network

Look at the

operation more

closely.

I have developed a new support to facilitate tile’s

installation, by quick stapling on the patented support

T1 Left : The support (9)differs when the

roofer push down the tile (3).

T2 Right : The support immobilizes the tile.

Support significantly improves the contact existing between tile and

water heated network. Heat transfer become better.

This support is multi-

fonctionnal and

upgrade the system

with many additional

benefits.

Support is also designed to work

under channel tiles.

Big advantage : it allows roofer to set all

the tiles without risk of mistake, making

them highly resistant to winds and storms.

It facilitates the roofer’s setting work and

save time.

1) New patented

support

2)Tube

3) Tile

9) Arm

11) Cavity

12) Hook

A good way to increase performance of

the system consists in upgrading thermal

insulation (between tile and roof)

Performance improvements are possible

by modifying shape, position and size of

the tube under the tile.

Research is underway in preparation for

industrialization.

PositionForm Size

Design optimisation

Conclusion : it’s the cheapest way to

produce hot water to heat building or

domestic use.

This system is very easy to

install, cheap, and offers smart look to

new or old buildings.

Materials used are available

everywhere, recyclable, with a very long

life cycle (minimum 30 years).

This system will complement existing

thermal solar solutions, discovering a

new original and sustainable way.

Solar Roofing Tiles

with incorporated

water tubeThanks for your attention.

Obrigado por sua atenção. Frédéric Marçais

Merci pour votre attention .