CITyFiED Site Laguna de Duero
Laguna de Duero is one of the municipalities surrounding the metropolitan area of the city of Valladolid, the administrative capital of the Castile and León region. Throughout the centuries, what was distinctive about the area was its natural lagoon, which dried out during the 1970s. This turn of events, however, determined the future of the city in a significant way. Laguna de Duero went through a period of growth and expansion, including the creation of the Torrelago district, which is the focus of the CITyFiED project’s activities.
The Torrelago district was built in two phases, each one involving a district heating network and the following numbers of buildings and dwellings:
· Phase 1: 12 buildings of 12 floors, with 4 apartments per floor, for a total of 576 dwellings with an average area of 100 m2. These buildings were constructed in 1977.
· Phase 2: 19 buildings of 12 floors, with 4 apartments per floor, for a total of 912 dwellings with an average area of 100 m2. Eleven buildings were constructed in 1979; the remaining eight were constructed in 1981.
Nowadays, this metropolitan area is established under the spatial planning directive of Valladolid and its surroundings, as all municipalities in the region have similar urban characteristics and mobility problems. A total of 416 000 residents live across a total area of about 1000 km2.
The overall gross floor area of 140 000 m² that has been refurbished in the Laguna de Duero demo site affects more than 4000 residents. The annual final energy saving estimate is 6598 MWh with respect to thermal energy savings (reduction of 38,65%) and 137.2 MWh/yr regarding electric energy savings associated with the district heating (reduction of 63.64%). The total CO2 emission savings estimate amounts to 212 tonnes per year.
In a truly cooperative approach, CITyFiED representatives carried out a workshop with the residents about the visualisation side of the district’s renovation. Participants had the opportunity to address various technological and non-technological solutions designed to cut energy consumption, and the effects that these could have on residents. The approach seeks to take account of user perspectives, and places residents at the heart of the decision-making process. For long-term success in green energy, projects like CITyFiED need residents to fully buy into the planned retrofitting and development. Such an approach raises awareness of energy challenges and increases the prospect of replicability through citizen engagement.
It is clear that investing to improve energy efficiency has profound environmental impacts. The CITyFiED demonstration site in Laguna de Duero is showing the economic and societal benefits as well, with 50 unemployed Laguna residents due to receive training and work on the renovation implementation of the building facades. More than 400 résumés reached CITyFiED partner 3IA, the company responsible for placing the new Torrelago building facades, when 50 new positions were advertised. Previously unemployed residents have been prioritised in the recruitment and the new hires will receive an extensive training programme, lasting around 2 weeks, to ensure a high-quality delivery of tasks on the facades and to prepare a talent base for future implementations in the project.
*Information regarding the technical and financial performance will be available at a later stage.
The key energy-efficiency measures implemented in the demonstration site are:
Energy efficiency in buildings
- Retrofitting the building envelope
Energy systems integration
- District heating and cooling
- Interconnection of the two original district heating networks in order to increase the overall performance of the whole system.
- Twelve new heat exchange substations at building level in Phase I have been built. In addition, a variable flow pumping system has been installed, as well as two buffer tanks of 25.000 L, smart control and management systems to adapt energy production and distribution, smart thermal energy meters at home level and individual smart thermostats and cut-off valves in each dwelling.
- Biomass boilers
o Three new high efficiency biomass boilers have been installed at the demonstration site. Works have included the construction of an underground boiler room, a biomass silo of 427 m3, installation of two buffer tanks, a smart metering system and the implementation of various substations.
- Cogeneration (CHP)
- Heat energy used for domestic hot water system
- ICTNeighbourhood energy management system
- Monitoring platform and visualisation platform
- Smart electricity grid
- Electricity generated by the CHP, used for the district heating facilities and the electrical vehicles recharging points.
- ICT as planning support
- Adaptive control and monitoring system