One of the benefits of a transnational project such as RECENT, is that is brings together case studies from a wide range of communities. These communities have many differences, however are brought together by the remote, rural nature of their locations, and as such have many more similarities than differences. The learning platform will showcase a number of case studies from across each of the five regions’, giving an insight into areas of best practice, new technologies and challenges which community groups and other stakeholders have overcome in their pursuit of self sustainability
Below is a series of case studies provided by our partner based in Sweden, Jokkmokk Municipality.
The first Case study is related to Sustainable Energy Action Plan Municipality of Älvsbyn, Sweden
You can read a full version of the Action Plan at Sustainable Energy Action Plan Municipality of Älvsbyn, Sweden
Jokkmokk, Sweden: district heating efficiency campaign
Jokkmokk district heating is to 98 percent based on bioenergy. Nevertheless, to be truly sustainable this is not enough as being energy and cost efficient is equally important. This is why there is now an efficiency campaign with a focus on the return temperature of the water coming back from the customers. This is a key indicator of heat network efficiency. A low return temperature results in a larger delta T, which means lower flow rates are required for the same kW delivered. By that, pumps and pipes work safer and more efficient. A cooler return pipe also lowers heat losses. In plants, which have like Jokkmokk a flue gas, condensation low return temperatures are very important for ensuring high efficiency of the condensation system. By installing new meter at customer’s facility it is now possible to find out where problems exist and to fix the problems, often by adjusting the customer’s heat exchanger.
Feasibility study for a co-digestion plant in the municipality of Jokkmokk, Sweden
Jokkmokk is a Swedish Eco-Municipality and a signatory of the EU Covenant of Mayors. It has developed its Sustainable Energy Action Plan (SEAP) and committed itself to reduce its GHG (greenhouse gas) emissions on its territory by at least 20% until 2020, compared to 2005. One part of the activities planned under the SEAP is related to bioenergy, and a feasibility study shall be undertaken whether biogas production can be economic and doable in Jokkmokk. Beyond climate protection, another incentive for a biogas production is the reduction of the sludge volume and even the smell of aerobic treated sludge. Today, sludge is treated to become a material for restauration of industrial/mining areas or in the street building. Both, storage, treatment and transport are expensive due to high volumes.
The feedstock for a possible biogas plant would consist of sewage sludge from the Wastewater Treatment Plant and biowaste mainly, and could lead to biogas yield of 62.000 m3 and an energy yield of 60 MWh a year. A very first calculation shows that a plant with a volume of about 300m3 would be necessary if the maximum potential could be realized. Plants in this size are pretty rare in Sweden, and they are mainly existing in the context of farms which are digesting manure. Biogas could potentially be upgraded to fuel for cars, by an innovative approach developed by JTI - Swedish Institute of Agricultural and Environmental Engineering. However, currently there are no biogas cars in Jokkmokk, but this interesting solution could be investigated further.
Vilhelmina, Sweden: Wastewater Heat Pump
Kittelfjäll is a long and mountainous long valley within Vilhlemina municipality, which has outstanding on- and off-piste skiing opportunities in a beautiful nature. The small village is becoming more and more attractive to people who want to have an own cottages there. The rising number of inhabitants makes it necessary to build a new sewage plant, which will be equipped with a highly efficient heat pump to make use of the heat in the wastewater. The heat pump will be about four times more effective at heating than a normal electric heating system. What makes the system special is the easy handling of the heat collector, which is very resistant to chemicals and easy to pull up and clean.