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Echirolles, France
Multi-family house (three buildings) | 689 sqm installation
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Description
The Isère department Public Housing Office (OPAC 38) manages public housing in the department, including more than 20,000 public housing units. Its main mission is to control the “rent + utilities” binary.
The Office decided to rehabilitate 505 dwellings in the Surieux housing complex using a holistic energy approach intended also to demonstrate the feasibility of alternative energy solutions in communal housing. To reduce tenants‘ rates bills, a widespread programme to control energy use was implemented by the Office in 1998. This programme includes the complete replacement of insulation and joinery, installation of double-glazing everywhere and the systematic use of energy-saving compact fluorescent light bulbs. The solar installation includes 705 sqm solar thermal collectors for producing hot water.
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Building
| Type of building | Multi-family-house
| Number of dwellings, floors | 505 dwellings
5 to 11 floors
| Year of construction | 1973
| Total effective area (heated) | not available | Hot tap water consumption (measured/estimated) | 18,800 m3/a (measured)
| Whole energy consumption for heating purpose after CSTS implementation | 1,363,000 kWh/a
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System engineering
| Year of construction of CSTS | 1999
| Type of collectors | Flat plate collectors
| Thermal power | 480 kWtherm.
| Aperture area of collectors*) | 689 m2 | Buffer storage | ./.
| Hot tap water storage | 42.0 m3 | Total capacity of boilers with energy source | 766,000
(District heating)
| Type of hot tap water heating | Centralised
| Type of heating system | Centralised
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Costs
| Total cost solar system | 1,067,000 Euro | Cost of the CSTS/gross area of collectors | ca. 1,430 Euro/m2 | Subsidies | 50 % |
Output
| Output of solar heat**) | 407,000 kWh/a | Reduction of final energy***) | 622,000 kWh/a
| CO2-emissions avoided | 131 t CO2/a
| Solar performance guarantee | Yes
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*) 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
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Mr. Gibert, OPAC 38 / Sustainable development and Europe Manager:
| „The main mission of the OPAC 38 is to control the “rent + utilities” binary. Moreover, CSTS has contributed to change the site image. Indeed, inhabitants are proud of these innovative and efficient installations.“
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Owner and Operator
| OPAC 38
Mr. Gibert
47, avenue Marie Reynoard – BP 2549
38035 Grenoble, France
Phone: +33 4 76205140
Fax: +33 4 76094346
michel.gibert(at)opac38.fr
www.opac38.fr | |
Description of the CSTS
| Year of construction of CSTS | 1999
| Thermal power | 480 kWtherm. | Gross area of collectors | ca. 745 m2
| Aperture area of collectors | 689 m2 | Type of collectors | Flat plate collectors
| Type of assembly | On flat roof
| Orientation of collectors | South (0°),
| Inclination angle to horizon | 43°
| Freezing protection | Glycol
| Overheating protection | Expansion vessel
| Operation mode | Variable
| Use of CSTS for | Hot tap water heating
| Buffer storage | ./.
| Hot tap water storage | 42.0
| Control of backup-system/CSTS | Separated control
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Hot tap water system
| Type of hot water heating | Centralised
| Recirculation system | Yes
| For decentralised systems:
The installation on the consumer site | ./.
| Size of storage for hot tap water | 42.0 m3 | Specification (if necessary) | ./. |
Space heating system
| Type of heating system | Centralised
| Number of boilers | 1
| Total capacity (power output) of boilers | 766,000 kW
| Capacity of each boiler (year of construction) | 766,000 kW (1960)
| Energy source | District heating
| Type of boiler system | ./.
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Type of operation
| Operator of the CSTS system | ESCO
| CSTS monitoring | Yes: solar radiation, output of solar heat, total water consumption, pression. Monitoring is done from afar by telephonic network and data are stored and edited every month for each project partner. The ASDER Association supervises these data.
| Data accessible via internet | Yes
| Scientific monitoring & follow up | Yes
| Maintenance contract | Yes, twice a year
| Visualisation of the solar heat output | Yes: data are edited each month and sent to all partners with data sheets and graphs.
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Yield of CSTS plant
| Output of solar heat | 407,000 kWh/a | Origin of data | Measured
| Measuring point | Between storage and piping to taps
| Reduction of final energy | 622,000 kWh/a
| Origin of data | Measurements
| Solar performance guarantee | Yes
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Heat consumption
| Whole energy consumption for heating purposes after CSTS implementation | 1,363,000 kWh/a | Origin of data | Measured
| Energy used for heating of | Hot tap water heating
| Whole energy consumption for heating purposes before CSTS implementation | 1,985,000 kWh/a
| Total tap water consumption | not available
| Hot tap water consumption | 18,800 m3/a
| Hot tap water temperature | 55 °C | Cold water temperature | 11 °C | |
Summary
| 689 sqm of flat plate solar collector have been installed on the roofs of the three residential complexes, facing south and with an inclination of 43°. The storage volume is 42 cbm, and the entire system is connected to the district heating system. The solar tanks have been installed in the three heating substations.
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Engineering company
| G.T.I
Mr. Rolland
141, rue des Alliés
Grenoble, France
Phone: +33 4 76701262
Fax: +33 4 76218666
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Introduction
The total cost of this operation was of 1,067,000 EUR. TTC subsidized at 50 % of the cost excluding VAT by European Union with 260,000 EUR, by the Rhône-Alpes Regional Council with 244,000 EUR and by the Isère Department with 30,500 EUR.
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Financing of the CSTS
| Form of financing | Purchase
| Distribution in percentage | 50 % |
Costs of solar materials
| Total cost of solar system | 1,067,000 Euro | Detailed costs
| not available
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Operation costs of heating system
| Maintenance cost
| 11,000 Euro
| Increase of the operation cost after CSTS implementation | not available | | Special note for subsidy systems in the partner country | · European Union:
260,000 EUR
· Rhône-Alpes Regional Council: 244,000 EUR
· Isère Department:
30,500 EUR
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Summary of experiences / Notices to the project performance
To reduce tenants‘ rates bills, a widespread programme to control energy use was implemented by the Office in 1998. To achieve this goal, the OPAC 38, has looked for new financing to cover further rehabilitation operations for buildings included in the heritage improvement plan.
This project was realised in the framework of the Agenda 21 and other projects will follow by respecting a strategic axis linked to sustainable development.
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Experiences management
| Experienced problems or failures? | No
| Found solutions to these problems or failures? | ./.
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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
DUO
30, quai de Grenoble
Grenoble, France
Phone: +33 4 76853320
Fax: +33 4 76509374
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