SOLARGE

Le Gébroula

Val-Thorens, France

Multi-family house | 63 sqm installation

 


Project summary · Technical description · Financing · Development · Downloads

Project Summary

Description

Europe‘s highest social building, built by the OPAC of Savoie in Val Thorens, has been preceded in 2003 by the Observatory of renewable energies (Observ‘ ER ) during the french national contest “Solar Housing Housing of Today“, mention “solar hot tap water restoration“.
Built in 1976 at a height of 2,350 meters, this 50 dwellings building is naturally confronted with the mountain weather conditions: snow and freezing. Thus a rehabilitation project was initiated by the OPAC of Savoie in 2001. The CSTS is used for hot tap water production.



 


Building

Type of building

Multi family house

Number of dwellings, floors

50 dwellings
7 floors

Year of construction

1976

Total effective area (heated)

not available 

Hot tap water consumption (measured/estimated)

1,200 m3/a (measured)

Whole energy consumption for heating purpose after CSTS implementation

50,000 kWh/a


System engineering

Year of construction of CSTS

2002

Type of collectors

Flat plate collectors

Thermal power

44 KWtherm.

Aperture area of collectors*)

63 m2

Buffer storage

4 m3

Hot tap water storage

12 m3

Total capacity of boilers with energy source

not available

Type of hot tap water heating

Centralised

Type of heating system

Decentralised


Costs

Total cost solar system

89,000 Euro

Cost of the CSTS/gross area of collectors

1,413 Euro/m2

Subsidies

80 %


Output

Output of solar heat**)

29,000 kWh/a

Reduction of final energy***)

31,000 kWh/a

CO2-emissions avoided

5.6 t CO2/a

Solar performance guarantee

Yes


*) Aperture area = light transmitting area of the front glass
**) measured, between storage and piping to taps (solar system output)
***) related to the measured output mentioned before

 

 


Mrs. Valérie Huc, OPAC Savoie, in charge of maintenance for restoration projects:

„This building was the first realisation of the french program “Plan Soleil“ for the Savoie and had allowed to relaunch the collective solar hot tap water production in the department. Now, the Savoie is at the first rank of the french department for solar energy.“

 

 


Owner & Operator

OPAC Savoie
Mrs Valérie Huc
7, rue de l‘Iseran
Chambéry, France
Phone: +33 4 79966060
Fax: +33 4 79966028
ValerieHUC(at)OPAC73.FR
www.opac-savoie.fr

Top of page Project summary · Technical description · Financing · Development · Downloads

Technical description

 


Description of the CSTS

Year of construction of CSTS

2002

Thermal power

44 kWtherm.

Gross area of collectors

63 m2

Aperture area of collectors

63 m2 

Type of collectors

Flat plate collectors

Type of assembly

Roof-integration

Orientation of collectors

South-East (-55°),

Inclination angle to horizon

75°

Freezing protection

Glycol

Overheating protection

Expansion vessel

Operation mode

Variable

Use of CSTS for

Hot tap water heating

Buffer storage

4 m3

Hot tap water storage

12 m3

Control of backup-system/CSTS

Shared control: If water is still at right temperature, electric resistance is not running


Hot tap water system

Type of hot water heating

Centralised

Recirculation system

No

For decentralised systems:
The installation on the consumer site

./.

Size of storage for hot tap water

8 m3

Specification (if necessary)

./.


Space heating system

Type of heating system

Decentralised

Number of boilers

0

Total capacity (power output) of boilers

./. kW

Capacity of each boiler (year of construction)

./. kW

Energy source

Electricity

Type of boiler system

./.


Type of operation

Operator of the CSTS system

ASDER Association

CSTS monitoring

Yes: Output of solar heat, hot tap water consumption;
Monitoring is done from afar by telephonic network by the way of energetic counting and is supervised by the ASDER Association.

Data accessible via internet

Yes

Scientific monitoring & follow up

Yes

Maintenance contract

Yes

Visualisation of the solar heat output

Yes: Data are edited each month and at the end of the year, they are gathered and shown through a scale and compared with designed data.

Yield of CSTS plant

Output of solar heat

29,000 kWh/a

Origin of data

Measured

Measuring point

Between storage and piping to taps

Reduction of final energy

31,000 kWh/a

Origin of data

OPAC

Solar performance guarantee

Yes


Heat consumption

Whole energy consumption for heating purposes after CSTS implementation

50,000 kWh/a

Origin of data

Measured

Energy used for heating of

Hot tap water heating

Whole energy consumption for heating purposes before CSTS implementation

81,000 kWh/a

Total tap water consumption

not available

Hot tap water consumption

1,200 m3/a

Hot tap water temperature

48 °C

Cold water temperature

4 °C

 

 


Summary

Solar installation is running since 2002. It is composed of two sides of solar collectors of 31,5 sqm each, placed in the highest part of the South-eastern gable of the building with a strong slope (75°) to gain by the winter sun and a good reflexion of solar radiations on snow.



 


Engineering company

CENA Ingénierie
Mr. Dominique Céna
725 faubourg Montmélian
Chambéry, France
Phone: +33 4 79750043
Fax: +33 4 79702811
cena(at)cena-ingenierie.fr 

Top of page Project summary · Technical description · Financing · Development · Downloads

Financing and investment

Introduction

The total investment for this solar project was of 89,000 € exclusive VAT. The ADEME, Rhône-Alpes province and Savoie department subsidized it at 80 %.


 


Financing of the CSTS

Form of financing

Purchase

Distribution in percentage

80 %


Costs of solar materials

Total cost of solar system

89,000 Euro


Detailed costs for

Collectors

36,000 Euro

Elevation/mounting structure

5,000 Euro

Storage, heat exchanger

18,600 Euro

Back-up heater

./. Euro

Control

8,600 Euro

Installation

3,400 Euro

Planning/Engineering

9,800 Euro

Others

7,600 Euro


Operation costs of heating system

Power cost for pumping

not available

Maintenance cost

not available

Monitoring cost

not available

Other operation cost

not available

Total operation cost

not available

or: Increase of the operation cost after CSTS implementation

900 Euro/a

 

 

Special note for subsidy systems in the partner country


 

 


Addresses



Top of page Project summary · Technical description · Financing · Development · Downloads

Development & experiences

Qualitative aspects of the CSTS

It has been preceded by the Observatory of renewable energies (Observ‘ ER ) during the french national contest “Solar Housing Housing of Today“, mention “solar hot tap water restoration“

Summary of experiences / Notices to the project performance

For the OPAC of Savoie, specific hot tap water and heating installations exist since more than 20 years ago in the framework of management charges and renewable energies.
This installation obtained good results due to an exceptional sunshine of the resort and to a very cold-water use. These performances are not exceptional regards to collectors’ inclination and orientation and to seasonal production.

 


Experiences management

Experienced problems or failures?

No

Found solutions to these problems or failures?

./.


Financial effects / project performance

Project economically efficient?

Yes

Fiscal or other financial effects?

No

Effects on rental fees?

Yes


Experiences technical staff

Experienced problems or failures?

No

Found solutions to these problems or failures?

./.

 

 


Architect

Chiantello
Mr. Jean-Pierre Chiantello
2 clos Roseraie
73100 Tresserve, France
Phone: +33 4 79340433
Fax: +33 4 79357936
chiantello.archi(at)wanadoo.fr 

Top of page Project summary · Technical description · Financing · Development · Downloads

Downloads

SOLARGE_goodpractice_fr_gebroula.pdf

this datasheet in printable PDF-format

747 K

gebroula_scheme.pdf

the hydraulic scheme

742 K