GREENsChOOLENERGY - Development and practical implementation of sustainable solutions for urban hotspots in combination with greening / PV / water

Use of the synergetic effects in the construction of photovoltaic, greening and irrigation systems at the location of HTL1 Klagenfurt Lastenstraße, to optimize the yield of experimental photovoltaic elements and at the same time reduce urban heat islands.

Short Description



Starting point / motivation

The adaptation of cities to the effects of climate change will be inevitable in the coming years. In the state capital of Klagenfurt on lake Wörthersee, too, higher temperatures and an increased occurrence of urban heat islands in areas with high surface sealing and building density are expected in the future.

The project GREENsChOOLENERGY sets its focus on the school building of the HTL1 Klagenfurt Lastenstraße, which is confronted with excessive overheating due to a spacious, south-exposed glass facade and a sealed surface in the main entrance area as well as a conventional flat roof above it. These conditions severely limit the physical and mental performance of the students and the teaching staff.

Contents and goals

In the present project, on the one hand, the urban heat island effect is to be reduced with a strategic greening of the forecourt and the flat roof, and on the other hand the high solar radiation is used for local electricity production. Particularly parts of the forecourt, large parts of the glass facade and the flat roof are suitable. Experimental PV-systems are used that are currently not yet ready for the market.

The flat roof is provided with vertical / bifacial PV-modules that are intended to cover peak loads in the morning and evening hours. These PV elements on the roof are combined with extensive greening and possible bright plant species in order to increase the albedo reflection and to achieve an additional increase in energy production. Reference values offer conventional, already existing PV modules on other parts of the roof.

The PV-elements of the glass facade are replaced with modules that track and move with the sun and are cooled in different ways (water layer, spray mist, greening of the facade, etc.) in order to achieve increased energy production. Greening measures on the forecourt should increase the quality of stay. An artificial watercourse is also created and electricity is generated in the close range with additional PV modules.


Work packages 3 (greening systems), WP4 (photovoltaic systems) and WP5 (supply and control) deal with the development and implementation of the planned greening and PV systems as well as their necessary control and supply. These work packages are closely interwoven and develop the respective concepts, detailed planning and implementation. Test reports and maintenance reports are to be drawn up for internal quality control.

Work package 6 (monitoring, modeling, evaluation, business models) ensures the preparation and processing of the data collected at the test facilities. For this purpose, energy yields on the experimental PV systems are examined, vegetation ecological peculiarities are monitored (wild bees, soil parameters on the green roof, etc.), micro and indoor climatic data (incl. ZAMG-weather station) were collected and the entire project is used in terms of cost / benefit ratio to create business models.

Expected results

In line with the smart city strategy of the state capital Klagenfurt on lake Wörthersee, the project helps to reduce the urban heat island effect in the immediate vicinity of the school and to contribute to a tolerable city climate. Local electricity production also increases the share of renewable energies and contributes to climate protection.

The construction of the different, innovative PV systems in combination with greening measures contribute to the fact that knowledge is generated in the technical implementation, as well as the market maturity in real operation, from the beginning of the planning, through the construction, to the completion and accompanying monitoring. As a result, business models should facilitate future implementation at other buildings and the knowledge gained should be made transferable.

Project Partners

Project management

IPAK - International Project Management Agency Klagenfurt on Lake Wörthersee GmbH

Project or cooperation partners

  • Verein zur Förderung der HTL Lastenstraße
  • Grünstattgrau Forschungs- und Innovations GmbH
  • Citygreen Gartengestaltungs GmbH
  • Stadtwerke Klagenfurt AG

Contact Address

IPAK - International Project Management Agency Klagenfurt on Lake Wörthersee GmbH
Dr. Wolfgang Hafner
Neuer Platz 1
A-9010 Klagenfurt am Wörthersee
Tel.: +43 (464) 537-4885