SOLARGE

Akeleihof, Wageningen (Netherlands)

Multi-family house | 46 sqm | 32 kWth | 2003

Social housing association "De Woningstichting" Wageningen installed a collective solar thermal system on the roof of one of their apartment buildings. The building hosts 60 apartments for approximately 90 senior people. The system was placed as part of an overall renovation of the collective space and hot water heating system.

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WBG Nibelungen, Amalienstraße, Braunschweig (Germany)

Multi-family house | 50 sqm | 33 kWth | 2003

The system is an integrated solar-heating system, an industrially prefabricated construction unit with direct control for the complete heat production and distribution. The solar operating method is as follows: priority of solar and direct feeding-in to the consumption points, whereas storage is subordinate.
The object was awarded with the DGS certificate for large-scale solar systems.

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Apartment blocks Reiger, Thorbecke, Lijster and Merel, Sliedrecht (Netherlands)

Multi-family house | 4 × 60 sqm | 4 × 42 kWth | 2005

In this project the social housing association Tablis Wonen realised a 4 collective solar thermal system each 65 sqm for hot tap water production on four similar apartment blocks with each 80 flats. The project took place as part of an overall renovation of the hot water installations.

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ATC Torino, Moncalieri (TO), (Italy)

Multi-family house | 96 sqm | 63 kWth | 2004

The plant was installed on a new building from ATC, which is a local social housing company, and produces hot tap water for 42 dwellings. The flat plate collectors are installed according to the solar roof technology and are divided in to different fields, facing respectively east and west. The solar roof integration is cost effective and minimises the visual impact of the collectors.

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Bachflat, Tilburg (Netherlands)

Multi-family house | 354 sqm | 250 kWth | 2005

Social housing association WonenBreburg realised a 354 sqm collective solar thermal system on one of their apartment buildings. The system is placed as part of an overall renovation of the building. The realisation of this system fits in WonenBreburg’s policies and in the energy covenant agreements closed between the social housing associations in Tilburg and the municipality.

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De Batauwe, Tiel (Netherlands)

Multi-family house | 132 sqm | 92 kWth | 2002

Social housing association Stichting Christelijke Woningcorporatie (SCW) realised a 150 sqm semi-collective solar thermal systems on the roof the Batauwe complex which is a new apartment building built in 2002 incorporating a renovated old building façade from a former jam factory (1916). The complex is part of new housing area with 500 dwellings built.

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Burgemeester Visserstraat en Schoutbackstraat, Tilburg (Netherlands)

Multi-family house | 87 sqm | 61 kWth | 2003

Social housing association Breburg realised a collective solar thermal system on the roofs of an apartment buildings complex which is split in 2 blocks: the Burgemeester Visserstreet (40 apartments, 8 floors) and Schoutbackstreet (20 apartments, 4 floors). The system is placed as part of an overall renovation of the building.

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Citè Jean Moulin - Plantes, Paris (France)

Multi-family house (13 buildings) | 950 sqm | 665 kWth | 2003

In the sustainable development framework, for service charges control and energy management, the OPAC 75 has chosen to develop solar thermal energy.
This project was done to renew a 1982 existing solar thermal system. This installation groups together 13 buildings and provide hot tap water production of the dwellings.

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La Darnaise - OPAC Grand Lyon, Vénissieux (France)

Multi-family house (five buildings) | 344 sqm | 241 kWth | 2005

The OPAC Grand Lyon continues the conversion of the Darnaise area that is composed of 11 towers of 17 floors built in 1970, and makes their tenants eco-citizens. This project was the most important solar operation in France at its starting-up, composed of 730 sqm, shared in three sections realised on three years.

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DEGEWO solar plant, Berlin (Germany)

Multi-family house | 59 sqm | 38 kWth | 2004

Seven large format collectors with an overall absorber surface of 58.8 sqm were set up onto the roof of a multi family house in Berlin (53 dwellings) in 2004.
The energy output of the CSTS is used for hot tap water heating and space heating support. In the first year of operation a solar energy output of nearly 30.000 kWh was measured.

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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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Le Gébroula, Val-Thorens (France)

Multi-family house | 63 sqm | 44 kWth | 2002

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. In 2003 it has been preceded by the Observatory of renewable energies (Observ'ER ) during the french national contest "Solar Housing – Housing of Today".

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GEWOBA AG, Bremen (Germany)

Multi-family house | 42 sqm | 27 kWth | 2005

GEWOBA AG housing company is starting to use innovative techniques when retro-fitting their buildings. This building is representative for their building stock and therefore was chosen for this measure.
The solar collectors are roof-integrated and used for hot tap water heating and space heating as well.

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Les Glycines, Cagnes-sur-Mer (France)

Multi-family house | 72 sqm | approx. 46 kWth | 2006

This building from 1978 is constituted of 91 dwellings shared in on 7 floors. The necessity to restore the hot water production installation and the wish to realise economic saving in a sustainable way have brought the co-owners to study solar possibility. The solar installation is composed of 72 sqm of solar collectors for a solar storage of 6 cbm and will cover 50 % of the hot water demand.

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Havikflat, Sliedrecht (Netherlands)

Multi-family house | 180 sqm | 125 kWth | 2004

Social housing association Tablis Wonen realised a collective solar thermal system on the roof of one of their apartment complexes with 160 apartments in 2 blocks. Due to a switch from individual kitchen tap water heaters to a collective solar hot water system, the comfort and indoor climate of the apartments has been improved significantly.

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Wohnungsgenossenschaft "Karl-Marx" Potsdam e. G., Potsdam (Germany)

Multi-family house | 222 sqm | 140 kWth | 2000

The presented residential building is a multi-storey-building of 11 floors, built in the typical tower block style of the 70ies. In 2000 a comprehensive reconstruction was done including several energy related measures. Furthermore the hole heating and hot water station was renewed. Today heat supply is effected by district heat and by the 222 sqm large solar thermal plant for a certain share of the hot water demand.

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Le Kirchfeld, Ostwald (France)

Multi-family house (12 buildings) | 406 sqm | 284 kWth | 2003

The 328 dwellings of the 12 buildings of Kircheld in Ostwald belong to the locative stock of CUS Habitat, the urban community of Strasbourg public housing office. The office has decided to invest in sustainable development and to involve its tenants in this approach. In 2000, they were involved by the “Take by storm to service charges” operation by giving propositions to decrease service charges.

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Königsberger Strasse, Wiesbaden (Germany)

Multi-family house | 34 sqm | 21 kWth | 2005

The thermal solar plant was established in the context of the energetic reorganization of the buildings. The accomplished measures concerned both the building cover, and the renewal of the heat production. It is expected a decrease of final energy consumption of 70 %.
The solar plant is used for tap water heating.

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Landse Akkers, Tilburg (Netherlands)

Multi-family house | 247 sqm | 173 kWth | 2003

Social housing association WonenBreburg realised a collective solar thermal system distributed on the roofs of the Landse Akkers building with a total of 144 dwellings. The system is placed as part of an overall renovation of the complex, including the hot water system and mechanical ventilation.


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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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Letellier, Paris (France)

Multi-family house | 55 sqm | 39 kWth | 2005

In the sustainable development framework the OPAC 75 has chosen to develop solar thermal energy. This desire comes within an energy control and a renewable energy development plan for the reduction of greenhouse gases. The building is facing south and this project was done to renew a 1983 existing solar thermal system stopped five years ago.

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Lilleroed Boligforening afd. 13, Alleroed (Denmark)

Multi-family-house | 53 sqm | 35 kWth | 1995

The CSTS is used only for domestic hot water heating. In the beginning the laundry machines in local common laundry facility also were connected to the domestic hot water system. But the machine supplier has recommended the association to disconnect that because there were no savings they said. (This is however not proved officially).

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El Llimonet, Vilanova i la Geltrú, Catalonia (Spain)

Type of building | 138 sqm | 92 kWth | 2000

The Vilanova "El Llimonet" solar thermal installation was one of the first residential buildings in which Qualitat installed a CSTS. With this project, the project developer and the Engineering/Installer company wanted to demonstrate the technical, economical and enviromental feasibility of a residential building designed with a low energy concept including a solar thermal installation.

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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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Mendelssohnstraat, Tilburg (Netherlands)

Multi-family house | 247 sqm | 173 kWth | 2003

Social housing association WonenBreburg realised a collective solar thermal system distributed on the roofs of 3 blocks of the Mendelsohn building complex with a total of 144 dwellings. The system is placed as part of an overall renovation of the complex, including the hot water system and mechanical ventilation.

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WG Merkur, Berlin (Germany)

Multi-family house | 56 sqm | 35 kWth | 2000

In the course of refurbishment the water heating was changed over from decentralised to centralised, particularly due to the high repair and maintenance costs. The decision for a solarthermal plant was made not least due to the positive experiences, the Merkur already gained in this field. The solar plant is used for both water heating and support of space heating.

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Moleneind, Tilburg (Netherlands)

Multi-family house | 247 sqm | 173 kWth | 2003

Social housing association WonenBreburg realised a collective solar thermal system distributed on the roofs of the Moleneind building with a total of 144 dwellings. The system is placed as part of an overall renovation of the complex, including the hot water system and mechanical ventilation.


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Els Molins, Sitges, Catalonia (Spain)

Multi-family house | 62 sqm | 42 kWth | 2000

This Qualitat Promocions project was developed as an integrated sustainable building demonstration project, including solar thermal installation, eco-friendly materials and an energy efficiency concept. Qualitat and BCN Cambra Logica Projectes, as the engineering company responsible for the CSTS, wanted to show the feasibility of the solar thermal installation.

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Neuhof-Canonniers, Strasbourg (France)

Multi-family house (five buildings) | 300 sqm | 210 kWth | 2005

These buildings belong to the locative stock of CUS Habitat, the urban community of Strasbourg public housing office. 300 sqm of collectors fixed on the building containing the heater, and allow covering 35 % of hot water consumptions. Solar storage is of 12 cbm and the back-up is provided by central natural gas boilers.

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WBG Neustadt, Neustadt a. d. Weinstraße (Germany)

Multi-family house | 50 sqm | 32.5 kWth | 2005

This object consisting of four buildings was totally refurbished: storefront, windows and heating system were renewed or renovated.
Hot tap water heating is done by the solar system according to an alternative storage principle – the other way around: the heat is used first and only the actual surplus heat is stored then.

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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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EWG Pankow, Berlin (Germany)

Multi-family house | 170 sqm | 100 kWth | 2006

In 2006 the EWG Pankow, a building association located in north-east Berlin, started comprehensive modernisation and reconstruction measures on seven multi-family buildings of one building type. By centralisation of heating and hot water generation the most important condition for solar thermal were created.

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Pijnboomflat, Tilburg (Netherlands)

Multi-family house | 82 sqm | 58 kWth | 2003

Social housing association WonenBreburg realised a collective solar thermal system on the roof of one of their apartment buildings with 6 floors and 95 dwellings. The system is placed as part of an overall renovation of the building, including the façade, entrance, bathrooms and toilets and the hot water system.


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Policlinica area, Giurgiu (Romania)

Multi-family house | 2 × 150 m2

During the summer Combined Heat and Power (CHP) Plant in Giurgiu should not produce electricity and therefore the hot water supply was turned completely off between April and November. Installation of 300 m² solar panels on two living blocks was in order to make hot water supply for 80 flats during the summer period.

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Quai Aulagnier, Asnières sur Seine (France)

Multi-family house | 90 sqm | 63 kWth | 2005

This installation was designed due to an environmental wish of the public sector housing office and to decrease the yearly energy cost of hot tap water of this multi-family house building. This building was built facing East in the beginning of seventies and consists of 99 dwellings shared on 10 floors.The CSTS was achieved to supply the most part of hot tap water heating of the whole building.

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Rives de Seine, Asnières sur Seine (France)

Multi-family house | 72 sqm | 50 kWth | 2005

This installation was designed due to an environmental wish of the public sector housing office and to decrease the yearly energy cost of hot tap water of this multi-family house building. This building was built facing East in the beginning of seventies and consists of 99 dwellings shared on 10 floors.The CSTS was achieved to supply the most part of hot tap water heating of the whole building.

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ZUP Les Salines, La Rochelle (France)

Multi-family house (12 buildings) | 1,060 sqm | 740 kWth | 2005

This site of twelve buildings of different levels and ground surface was built in late 70's and is composed of twelve former generation solar installations linked with geothermal heat pump. It has been decided to restore the former solar installation and to link it with another renewable energy. The new CSTS is used to supply hot tap water production and is composed of 1,164 sqm of collectors.

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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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Saussures, Paris (France)

Multi-family house | 210 sqm | 147 kWth | 2005

In the sustainable development framework, for service charges control and energy management, the OPAC 75 has chosen to develop solar thermal energy. This desire come within an energy control and a renewable energy development plan for the reduction of greenhouse gases.This project was done to renew a 1984 existing solar thermal system stopped few years ago.

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Schalkwijk, Haarlem (Netherlands)

Multi-family house (9 blocks) | 2,900 sqm | 2,000 kWth | 2002

Nine 40-year old blocks with 382 apartments have been extensively retrofitted.
The housing corporations originally planned to install individual combined gas-fired boilers for space heating and hot water. This would however consume scarce living space. The sustainable centralized heating system appeared to be a good alternative.

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Scheffelstraße 35, Freiburg (Germany)

Multi-family house | 29 sqm | 20 kWth | 2005

A 1915 built apartment house without any refurbishments was completely energetically renovated in 2005. Following measures were done: fully insulating, dual-pane windows, glazing of balconies to loggias, installing of historical box-type windows and a vestibule, a cistern for using rain water for toilets, a central hot tap water and space heating system based on renewable energies.

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Scheffelstraße 48, Freiburg (Germany)

Multi-family house | 20 sqm | 14 kWth | 1999

This is a listed building which was erected in 1899. Following measures were done in 1999: insulation of the whole attic, cellar walls and facades, installing of dual-pane windows, glazing of the west faced balconies, installing of historical box-type windows and a vestibule, installing of a central hot tap water and space heating system based on renewable energies.

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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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Sperwerflat I, Sliedrecht (Netherlands)

Multi-family house | 89 sqm | 62 kWth | 2003

The social housing association Tablis Wonen realised a 90 sqm collective solar thermal system for hot tap water production on an appartment complex with 80 flats.
The project took place as part of an overall renovation of the hot water installations.

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”Sundparken” Solvarmeanlæg, Helsingør boligselskab, Elsinore (Denmark)

Multi-family house | 336 sqm | 235 kWth | 2000

The tenants initiated the installation of the CSTS and the motivator was the board of the association. The CSTS consist of flat plate collector in 2-part orientation (half west, half east). The solar thermal system was made as a demonstration project and consequently the price of the plant reflects this issue.

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Surieux, Echirolles (France)

Multi-family house | 689 sqm | 483 kWth | 1999

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.

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Tafecsados, Sant Cugat, Catalonia (Spain)

Multi-family house | 24 sqm | 16 kWth | 2006

The property developer Tafecsados is currently building 10 small apartment blocks in Sant Cugat, each containing 12 apartments. In this municipality, a solar ordinance is in force, which makes a solar thermal system mandatory for new buildings with a minimum solar fraction of 60 %. In this project a semi-de-centralised solution was chosen, divided over four circuits.

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TELESUN, Verona (Italy)

Multi family house | 370 sqm | 230 kWth | 2003

This plant was installed on six existing buildings in Saval, Verona. Each building has nine levels.
A new technical room was built for the solar thermal plant’s components.
The flate plate collectors are installed on roof pitches facing south and produce heat for domestic hot water preparation.
The monitoring equipement calculates the produced solar heat and the total energy need.

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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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Tulbeckstraße, Munich (Germany)

Multi-family house | 180 sqm (2 × 90 sqm) | 126 kWth | 2005

The heat supply of the whole building is realised by two heating systems. Each heating system consists of two natural gas condensing boiler, four hot tap water heaters and a serial hot tap water heater. Both heating systems are supported by a solar thermal system. All solar energy is stored in two buffer storages. Solar heat is only used for hot tap water generation.

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Valkhofflat, Sliedrecht (Netherlands)

Multi-family house | 180 sqm | 125 kWth | 2003

Social housing association Tablis Wonen realised a collective solar thermal system on the roof of one of their apartment complexes with 160 apartments in 2 blocks. Due to a switch from individual kitchen tap water heaters to a collective solar hot water system, the comfort and indoor climate of the apartments has been improved significantly.

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Vèrtix, Sant Boi de Llobregat, Catalonia (Spain)

Multi-family house | 58 sqm | 38 kWth | 2005

The main reason to install the CSTS was the Sant Boi de Llobregat Solar Ordinance. By this municipality ordinance one is obliged to install solar thermal systems in new buildings for hot water preparation with a minimum solar fraction of 60 %.
Uncovered solar thermal collectors were integrated in an inclined roof.

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Vèrtix, Sant Cugat del Vallès, Barcelona (Spain)

Multi-family house | 61 sqm | 42 kWth | 2005

The main reason to install the CSTS is the Sant Cugat del Vallès Solar Ordinance. By this municipality ordinance one is obliged to install solar thermal systems in new buildings for hot water preparation with a minimum solar fraction of 60 %.
VERTIX was satisfied with the realized solution and will apply more systems of this kind in the future.

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Via Tovo, Olgiate Olona (Italy)

Multi-family house | 45 sqm | 28 kWth | 2007

Complete restructuring and conversion of existing rural buildings into a residential complex, conceived to combine best building practice with well accepted and experimented energy saving measures. High standard thermal insulation and efficient low temperature central heating coupled are among the other features accompanying the solar thermal water heating system.

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