A new solar system is on its way from our factory at Jevnaker to Iurreta in northern Spain. The solar collectors will be installed as a building-integrated solution in one of the south-facing facades of a larger building complex. The solar collectors will deliver energy for heating and domestic hot water preparation to the building itself, while also providing surplus heat to a low-temperature district heating network.
The Iurreta site is a campus comprised of 13 multi-rise buildings with different architectonic designs and use profiles. The complex hosts several of the Basque Country regional police (Ertzaintza)´s emergency, rescue and rapid intervention units. Most of the buildings are dedicated to administrative purposes, but there are also spaces for residential use, sports facilities, warehouses and a public swimming pool.
All buildings in the campus area receive their heating services from a district heating network. The heat is produced by two condensing boilers with a total capacity of 650 kilowatts and the network is originally designed for an operational temperature of 80 degrees. A part of the network is now transformed into an ultra-low temperature network. The reduction of supply-line temperature guarantees the incorporation of low-exergy heat sources such as our solar heating system with minimal constraints.
The building complex is defined as a demonstration site within the Horizon 2020 project RELaTED, where the main focus is innovative solutions for heat delivery from renewable energy sources and technologies into low-temperature district heating networks. The REaTED approach follows the strategy of the electrical smart grids, in which energy generation is decentralized and consumers evolve to prosumers (they both consume and produce energy). At this specific site we are also testing the possibilities of ultra-low temperature district heating systems in corporate building complexes.
The new ultra-low temperature network will help raise the efficiency of the existing heat plant by reducing the water production temperature in one of the boilers, and in turn also distribution heat losses. These improvements, along with the incorporation of solar heating as an energy source and the prospect of using the reject heat from cooling equipment, will lower the energy bill and the CO2 emissions of the building complex.
The Iurreta campus
The RELaTED project: