CITyFiED Site Lund
Lund is a medium-sized university city with a research-intensive industry. The town dates back a thousand years, but the number of inhabitants has grown largely during the last century and a great stock of the buildings from the 1960s and 1970s now needs retrofitting. Almost 90% of the heat demand in the city is supplied by district heating, and the hospital and some office buildings are connected to a district cooling network.
The Linero district is a housing area where the blocks Eddan and Havamal consist of 28 three-level dwellings built in early 1970s. Today they contain a total of 681 apartments with approximately 2000 tenants. They are owned by the public housing company Lunds Kommuns Fastighets (LKF) AB. Only 16 of the 28 buildings are included in the CITyFiED project’s 40,400 m2. The retrofitting of Linero district will focus on reaching a higher energy standard with maintained affordability for the tenants:
- +30,8% total energy savings
- -19% primary energy use
- -26% greenhouse gas emissions
During the first part of the project, simulations of the energy efficiency measures included in the retrofitting strategy have been carried out. Simulations showed that original energy savings targets cannot only be accomplished – but have even been revised upwards.
After some positive first round of analysis, total energy savings in Linero have been calculated at approximately 52 kWh/m²/year, potentially even higher than the original target of 30.8 %. Primary energy savings at the site have been established at 19 % and greenhouse gas emissions will be reduced by 26 %, using 2016 conversion factors.
Four indicators for indoor environmental quality in the buildings were analysed: operative temperature, relative humidity, CO2 levels and the PPD index to measure ambient climate dissatisfaction. None of the indicators show critical levels in the current buildings and no negative effect have been observed from calculations of the renovation measures.
At the heart of reaching these performance targets is the efficiency of an extensive renovation strategy. From replacement windows and balconies, to presence controlled LED lighting in the stairwells, the actions being taken within CITyFiED are meticulously researched and planned.
Numerous full-scale concept solutions to complement structural advantages will include smart grid monitoring initiatives - with visualization tools and demand responsive meters – solar panels, fast charge points for electric vehicles and smart district heating controls.