A professional bachelor project report from Aalborg University
Low Temperature District Heating: Consequences for Existing Buildings
[Lavtemperaturfjernvarme: Konsekvenser for eksisterende bygninger]
Author(s)
Term
7. term
Education
Publication year
2015
Submitted on
2016-01-14
Pages
34 pages
Abstract
Denne diplomprojektrapport belyser konsekvenserne for den eksisterende boligmasse, hvis fjernvarmesektoren implementerer lavtemperaturfjernvarme. Da op mod 40 % af enfamilieshusene i Danmark er bygget i perioden 1960-1979, er det denne boligtype, der fokuseres på i denne rapport. Det bliver påvist i rapporten, at hvis temperatursættet for fjernvarmen ændres fra 70/40 °C til 55/30 °C bliver radiatoreffekten reduceret til 55 % af den oprindelige effekt. Det belyses desuden, hvordan der kan kompenseres for dette effekttab ved ændring i bygningens klimaskærm, og hvilke konsekvenser det får for bygningens opvarmning, hvis der ikke foretages ændringer af klimaskærmen. På baggrund af de opstillede modeller og antagelser, konkluderes det i rapporten, at det kun er i en begrænset periode at varmebehovet for bygningen ikke er opfyldt. Der er således grundlag for at fjernvarmesektoren kan påbegynde overgangen til lavtemperatur, da det kun vil påføre forbrugerne ulemper i begrænset omfang.
This bachelor thesis addresses the consequences for existing buildings if the district heating sector implements low temperature district heating. Since up to 40 % of the existing single-family buildings have been built in the period 1960-1979 the emphasis of this report will be on that specific type of building. It is shown in this report that if the district heating temperature set is changed from 70/40 °C to 55/30 °C the heating power output of the radiator is reduced to 55 % of the original heating output. Furthermore it is evaluated what changes there have to be done on the building envelope to compensate for this power loss, and what the consequences will be for heating of the building if nothing is done on the building envelope. Based on the created models and assumptions in the report it is concluded, that it is only in a limited period that the heating demand of the building cannot be fulfilled. Thus, there is basis for the district heating sector to commence the transition to low temperature district heating, since it only will cause limited inconvenience to the consumer.
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