SOLARGE

Eggenberger Allee, Graz (Austria)

Multi-family house | 120 sqm | 84 kWth

The condominium "Eggenberger Allee" consists of 56 dwellings, with an average area of 50 m² to 95 m² and in addition some offices. The building has a centralised heat supply system, which is fed by a solar thermal system and a natural gas condensing boiler. 120 m² of serial connected collectors significantly provide this building during the summer months. OPTISOL project

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Eggersdorf, Eggersdorf bei Graz (Austria)

Multi-family house | 48 sqm | 34 kWth

Terraced buildings in Eggersdorf are completely supplied with renewables: backup heating of the solar thermal system is done by a wood chips boiler. The storage tank volume is 6,000 litres.
The heat supply is realised by a 2-pipe plumbing with decentralised heat transfer units in each dwelling. OPTISOL project

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Lange Gasse, Graz (Austria)

Multi-family house | 214 sqm | 150 kWth

In the centre of Graz, the residential building "Lange Gasse" is located. A 214 m² roof integrated collector field is divided onto two buildings. A pit of the foundation was incorporated, so that a 16 m³ buffer storage tank could be placed in the cellar. Dwellings and the commercial area are supplied with heat by a 2-pipe system. Auxiliary: district heating. OPTISOL project

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Markt Hartmannsdorf, Markt Hartmannsdorf (Austria)

Multi-family house / surgery | 30 sqm | 21 kWth

Demonstration project "Markt Hartmannsdorf" is a 60 years old main building with a new constructed extension, where a surgery is located. The heat supply is realised by a 2-pipe plumbing with decentralised heat transfer units in each dwelling. During the summer, when the district heating is deactivated, the solar system covers 100 % of the heat demand. OPTISOL project

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Nittnergasse, Graz (Austria)

Multi-family house | 30 sqm | 21 kWth

The residential building "Nittergasse" includes six dwellings. 30 m² of collectors are mounted, south side orientated, on flat roof with an inclination of 45°. The centralised heating station is installed in the ground floor. The building is supplied by a combination of solar heat and a natural gas condensing boiler. High solar yields point out a perfectly balanced heat supply system. OPTISOL project

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Sandgasse, Graz (Austria)

Multi-family house | 160 sqm | 112 kWth

In the eastern part of Graz the residential building "Sandgasse" is located. 160 m² of collectors are mounted on two building’s flat roofs. A pit in the foundation was incorporated during the planning stage, so that a 12 m³ buffer storage could be placed in the cellar. Both, the dwellings as well as the surgery are supplied by a 2-pipe plumbing. Auxiliary: district heating. OPTISOL project

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Schwarzer Weg, Graz (Austria)

Multi-family house | 96 sqm | 67 kWth

The condominium "Schwarzer Weg" consists of six parts of a building, arranged around an inner courtyard. The collectors are mounted on a steel construction and are also used as marquee of the terrace. With a 12 m³ buffer storage the heat supply of 40 dwellings connected by a 2-pipe plumbing is realised. A 200 kW natural gas condensing boiler is in service for backup heating. OPTISOL project

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Schwarzparkstraße, Salzburg (Austria)

Multi-family house | 156 sqm | 110 kWth

This condominium consist of five compact objects, each including ten terraced house type buildings. A 156 m² solar thermal system and a wood pellet boiler (basic load) cover almost 100 % of the heat demand. Only really high peak loads are supplied by a natural gas condensing boiler. The solar thermal system is mounted on two building's flat roofs with an inclination of 45°. OPTISOL project

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Seiersberg, Graz (Austria)

Multi-family house | 96 sqm | 67 kWth

The solar thermal system of "Seiersberg" has been running for a long period. The heat demand is covered by a district heating and a solar thermal system (96 m²). The collectors are mounted with an inclination of 30° on the flat roof. During the summer time, when the district heat supply is deactivated, two 35 kW electric heaters are used for backup heating. OPTISOL project

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Theodor-Körner-Straße, Graz (Austria)

Multi-family house / office building | 240 sqm | 168 kWth |

Condominium and office buildings "Theodor-Körner-Straße" are composed of three buildings. 240 m² collector area, also used as marquees, is an integral part of the building. Backup heating is realised from district heating.
The office area is additionally equipped with a ventilation system, combined with heat recovery systems and geothermal heat exchangers. OPTISOL project

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