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The impact on the energy system of heating demands in buildings: A case study on district heating and electricity for heating in Falun, Sweden
Mälardalen University, School of Business, Society and Engineering, Future Energy Center.
2017 (English)Licentiate thesis, comprehensive summary (Other academic)
Place, publisher, year, edition, pages
Västerås: Mälardalen University , 2017.
Series
Mälardalen University Press Licentiate Theses, ISSN 1651-9256 ; 250
National Category
Energy Engineering
Research subject
Energy- and Environmental Engineering
Identifiers
URN: urn:nbn:se:mdh:diva-34255ISBN: 978-91-7485-305-6 (print)OAI: oai:DiVA.org:mdh-34255DiVA: diva2:1056867
Presentation
2017-02-09, Högskolan Dalarna, Borlänge, 13:00 (Swedish)
Opponent
Available from: 2016-12-15 Created: 2016-12-15 Last updated: 2017-01-09Bibliographically approved
List of papers
1. Primary energy use in buildings in a Swedish perspective
Open this publication in new window or tab >>Primary energy use in buildings in a Swedish perspective
2016 (English)In: Energy and Buildings, ISSN 0378-7788, E-ISSN 1872-6178, Vol. 130, 202-209 p.Article in journal (Refereed) Published
Abstract [en]

The building sector accounts for a large part of the energy use in Europe and is a sector where the energy efficiency needs to improve in order to reach the EU energy and climate goals. The energy efficiency goal is set in terms of primary energy even though there are different opinions on how to calculate primary energy. When determining the primary energy use in a building several assumptions are made regarding allocation and the value of different energy sources. In order to analyze the difference in primary energy when different methods are used, this study use 16 combinations of different assumptions to calculate the primary energy use for three simulated heating and ventilations systems in a building. The system with the lowest primary energy use differs depending on the method used. Comparing a system with district heating and mechanical exhaust ventilation with a system with district heating, mechanical exhaust ventilation and exhaust air heat pump, the former has a 40% higher primary energy use in one scenario while the other has a 320% higher in another scenario. This illustrates the difficulty in determining which system makes the largest contribution to fulfilling the EU energy and climate goals.

Keyword
Air heat recovery, District heating, Energy efficiency, Heat pump, Primary energy, Primary energy factors, Heat pump systems, Heating, Ventilation, Ventilation exhausts, Waste heat, Building sectors, Different energy sources, Exhaust air, Heat pumps, Large parts, Mechanical exhausts, Primary energies, Primary energy use
National Category
Energy Engineering
Identifiers
urn:nbn:se:mdh:diva-33110 (URN)10.1016/j.enbuild.2016.08.026 (DOI)000385323900019 ()2-s2.0-84983483204 (Scopus ID)
Available from: 2016-09-08 Created: 2016-09-08 Last updated: 2016-12-15Bibliographically approved
2. Mapping of heat and electricity consumption in a medium size municipality in Sweden
Open this publication in new window or tab >>Mapping of heat and electricity consumption in a medium size municipality in Sweden
2017 (English)In: Energy Procedia, ISSN 1876-6102, E-ISSN 1876-6102, Vol. 105, 1434-1439 p.Article in journal (Refereed) Published
Abstract [en]

The Nordic electricity system faces many challenges with an increased share of intermittent power from renewable sources. One such challenge is to have enough capacity installed to cover the peak demands. In Sweden these peaks appear during the winter since a lot of electricity is used for heating. In this paper a mapping of the heat and electricity consumption in a medium size municipality in Sweden is presented. The paper analyze the potential for a larger market share of district heating (DH) and how it can affect the electrical power balance in the case study. The current heat market (HM) and electricity consumption is presented and divided into different user categories. Heating in detached houses not connected to DH covers 25 % of the HM, and 30 % of the electricity consumption during the peak hours. Converting the detached houses not connected to DH in densely populated areas to DH could reduce the annual electricity consumption by 10 %, and the electricity consumption during the peak hours by 20 %.

National Category
Energy Engineering
Research subject
Energy, Forests and Built Environments
Identifiers
urn:nbn:se:mdh:diva-34252 (URN)10.1016/j.egypro.2017.03.534 (DOI)2-s2.0-85020728483 (Scopus ID)
Funder
Knowledge Foundation
Available from: 2016-12-15 Created: 2016-12-15 Last updated: 2017-06-29Bibliographically approved
3. Assessment of the potential for district heating to lower the peak electricity consumption in a medium size municipality in Sweden
Open this publication in new window or tab >>Assessment of the potential for district heating to lower the peak electricity consumption in a medium size municipality in Sweden
(English)Manuscript (preprint) (Other academic)
Abstract [en]

Sweden faces several challenges when more intermittent renewable power is integrated into the energy system. One of the challenges is to have enough electrical power available in periods with low production from intermittent sources. A solution to the problem could be to reduce the electricity peak demand and at the same time produce more electricity during peak hours. One way of doing this is to convert electricity based heating in buildings to district heating (DH) based on combined heat and power (CHP).

The study analyzes how much a medium sized Swedish municipality can contribute to lower the electricity peak demand. This is done by quantifying the potential to reduce the peak demand for six different scenarios of the future heat market volume and heat market shares regarding electricity based heating and DH in 2050.

The main finding is that electricity consumption will be reduced by 35-70 % during the peak hour (and 20-40 % on a yearly basis) for all the six scenarios studied compared with the current situation. If the aim is to lower the electricity peak demand in the future, the choice of heating system is more important than reducing the heat demand itself. For the scenario with a large share of DH, it is possible to cover the electricity peak demand in the municipality by using CHP.

National Category
Energy Engineering
Identifiers
urn:nbn:se:mdh:diva-34253 (URN)
Available from: 2016-12-15 Created: 2016-12-15 Last updated: 2016-12-15Bibliographically approved

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