12 Dec 2018
The project aims to finish pilot case studies during the upcoming winter months.
EEBAK project started in the beginning of 2017 and has progressed beyond the midway point. As 2019 approaches, the project aims to finish pilot case studies during the upcoming winter months. These pilot case studies are done in previously chosen buildings in the arctic regions in Finland, Sweden and Norway.
The studies are expected to produce good practice knowledge in building energy efficiency and, afterwards, EEBAK has planned to hold seminars in all three countries (mainly in the municipalities in the Interreg Nord area) to disseminate the results during spring-autumn of 2019.
As a part of the studies in EEBAK, a literature study of previously completed energy efficiency studies and projects has been done. Here are a few highlight samples of good energy efficiency practices lifted from those studies:
Additional insulation of external walls can provide 10% savings. It is typically economically feasible if done when other repairing is done for external walls. Typically, additional insulation during structural renovation raises investment cost only 5-15%, so the payback period stays short. Heat losses through attic floor is relatively small in apartment buildings, but in detached houses heat losses are much higher. Additional insulation for attic floors should be considered, especially when there is enough space between attic floor and roof. It could be done with blow wool on the top of old insulation.
New windows can also give 5-10% saving. Today’s typical window’s thermal insulation is about three times better than the 1970’s window. The U-value of the current basic window is 1,0 W/m2K, which is also the requirement for building construction in the collection of the National Building code of Finland. The durability of the window depends essentially on their structure, materials used, and the quality of maintenance. Damage to the windows is due to, among other things, outdoor exposure. The worst are the sloping slope, solar radiation (especially dark windows) and air pollution. Window damage is also caused by the use of windows and poor handling, such as, the failure to observe the regular care of the paintwork and paint surfaces.
Saving in electrical cost
Basic maintenance of ventilation system can provide 10% savings. Old fashioned lightning bulbs can be replaced with more energy efficient ones and get 5-10% savings. The new building automation system can create 5-10% savings. In addition, basic maintenance of elevators can also save some electricity in apartment houses.
Reducing heat energy and water consumption
In many cases heat energy is wasted because the radiators do not work as they should. Radiators might be too small, which is compensated by raising temperature of circulating water. Thermostatic valves might not work properly or customers does not know how they are used. Balancing heat loads and repairing heat distribution systems can together provide about 15% savings. Furthermore, investing in an air-heat pump is a good way to reduce electricity or oil usage for heating. Heat pumps can be also used for cooling in summer time, however active or unnecessary cooling might cancel the savings. If heat pumps are used to support direct electricity heating, the savings in electricity usage are 8-26%.
On the other hand, water could be saved 10% with nozzles and valves, which controls water flow and pressure. When larger renovation is done for the pipelines, it is usually feasible to install new water fittings same time. New taps and toilets can save 10-25% water compared as old ones.
References provided by EEBAK lead partner:
For further information, please contact Mikko Rintala, Project Manager at Lapland University of Applied Sciences (Finland).