Evaluation of buildings’ suitability as thermal energy storage in a district heating system

Visa enkel post
dc.contributor.authorElebo, Joi
dc.contributor.authorPetersson, David
dc.contributor.departmentChalmers tekniska högskola / Institutionen för energi och miljösv
dc.contributor.departmentChalmers University of Technology / Department of Energy and Environmenten
dc.date.accessioned2019-07-03T13:11:16Z
dc.date.available2019-07-03T13:11:16Z
dc.date.issued2013
dc.description.abstractWhen there are peaks in the power demand for district heating, back-up boiler plants using fossil fuels are often used in order to satisfy the demand. These plants are less efficient and less environmental friendly than base load plants. In an effort to reduce the need for back-up boilers, a share of the buildings in the network could be used as thermal energy storage. By moving the time of their heat deliveries peaks could be avoided, resulting in a more even load supplied by base load plants. The question is to what extent buildings are suitable of withstanding adjustments in heat delivery. This thesis examines the possibilities of using buildings as thermal energy storage, by analysing measurements performed by Göteborg Energi in several buildings in 2010-2011. During these measurements tests were carried out in which the input signal from the outdoor temperature, which controls the heat supply to the radiators, was adjusted. Test cycles were designed in order to alternate between periods of charge and discharge of heat and carried out at different times of the day to avoid variations caused by the users and weather. This resulted in a pattern of eight cycles per week. Test buildings are evaluated by the following parameters: how the indoor temperature (measured in two apartments per building) and heat supply change during test cycles; the size of these variations compared to natural variations; for how long the heat deliveries can be reduced and how different outdoor temperatures affect building behaviour. Initial results showed that the indoor temperature was rather stable during regular heating, but alternated according to the test cycles when they were used. During testing, temperature changes during the discharge period were less than 1°C and often less than 0.5°C. Some differences between the buildings could be found, but since there were such variations between apartments within the buildings, not all of them were certain. Larger change of the control signal in the test often showed larger temperature variation, but not entirely proportional. The temperature change may have been impacted by variations in outdoor temperature, but the variations between different results may also have different causes. The temperature variations caused by the tests were found to be in the same level of magnitude as the natural variations in the apartments. That indicated a possible decrease in power of about 10 W/m2 for a normal-to-discharge test period and 17-21 W/m2 for a charge-to-discharge test period.
dc.identifier.urihttps://hdl.handle.net/20.500.12380/179182
dc.language.isoeng
dc.relation.ispartofseriesExamensarbete - Institutionen för energi och miljö, Avdelningen för installationsteknik, Chalmers tekniska högskola : E2013:02
dc.setspec.uppsokLifeEarthScience
dc.subjectBuilding Futures
dc.subjectEnergi
dc.subjectSamhällsbyggnadsteknik
dc.subjectBuilding Futures
dc.subjectEnergy
dc.subjectCivil Engineering
dc.titleEvaluation of buildings’ suitability as thermal energy storage in a district heating system
dc.type.degreeExamensarbete för masterexamensv
dc.type.degreeMaster Thesisen
dc.type.uppsokH
local.programmeSustainable energy systems (MPSES), MSc
Ladda ner
Original bundle
Visar 1 - 1 av 1
Bild (thumbnail)
Namn:
179182.pdf
Storlek:
3.17 MB
Format:
Adobe Portable Document Format
Beskrivning:
Fulltext
Ladda ner
Samling
Examensarbeten för masterexamen