https://www.mdu.se/

Mälarenergi AB is a company that produces district heating to many people in and around Västerås city in Sweden. The problem is that there is one customer, Lantmännen, who need 90℃ district heating when the rest of the district heating network only need 80℃, which creates losses. Previous research shows that lower temperatures in the supply temperature will reduce the losses. The main reason for this thesis is to understand how big the losses are due to the warmer supply temperature that Lantmännen need and if there is a solution for the problem. The main method that has been used is hour for hour values in excel, the values have been calculated to alfa-value, marginal cost, losses on the district heating network and loses in electricity sales due to higher supply temperature. The results have mostly been presented in diagrams, some results have been in numbers. The study has found that 2021 did Mälarnergi lose 954 000 kr and in 2022 4 962 000 kr in electricity sales due to the higher supply temperature in August to October. The extra losses on the district heating network system due to higher supply temperature was 2021 4 630 MWh and in 2022 6 600 MWh. The proposed solution is that when Lantmännen moves they need to be connected to the district heating line that goes to the underground storage, which is a separate line. The losses will therefore decrease on the whole district heating network.