Efficiency factors for space heating system in buildings

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MARC

Brembilla, Christian,1983-Umeå universitet,Institutionen för tillämpad fysik och elektronik,Energy efficiency (author)

Efficiency factors for space heating system in buildings

BookEnglish2018

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Umeå :Umeå University,2018
61 s.
electronicrdacarrier

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LIBRIS-ID:oai:DiVA.org:umu-151981
ISBN:9789176019245
https://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-151981URI

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Language:English
Summary in:English

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SwePubSwePub

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Subject category:vet swepub-contenttype
Subject category:dok swepub-publicationtype

Notes

The thesis focuses on the efficiency of the space heating system. In particular, the efficiency factors measure the efficiency of thermal zone. The efficiency factors measures how the energy is used in a space heating. Efficiency factors relatively close to one mean that the energy is used "efficiently'', by contrast, efficiency factors close to the zero mean that the majority of the energy is lost to the outdoor environment. This method for the appraisal of space heating performance reads as if it is apparently simple and intuitive. In reality, the efficiency factor method has several pitfalls.The thesis provides tools, insights and remarks on how to apply the efficiency factor method to space heating systems equipped with hydronic panel radiator and floor heating respectively. Models of the latter heaters together with the multilayer wall were developed and validated to understand the reliability of their predictions. The hypothesis is that the heat stored in the building thermal mass and heaters plays a role in defining the building thermal performance and as a result in the appraisal of the efficiency factors. The validation is based on the sensitivity bands of the models' predictions. The heaters were tested in in a thermostatic booth simulator. Benefits and drawbacks of each model were highlighted to increase awareness of their use in the engineering fields. The results showed how the models accounting for the heat stored performed the charging phase. In addition, results of how the multilayer wall delayed and damped down the heat wave coming from the outdoor environment were presented with the appraisal of the decrement factor and time delay of the indoor temperature. The results of the efficiency factors analysis reveal how the weather affects the efficiency of each locality situated in cold climates. Lastly how different control strategies impact on the efficiency factors of space heating and its distribution system. To conclude, this study highlights the paradoxes around the efficiency factor method. The thesis proposes how such factors have to be interpreted by researchers and scientists tackling the lack of information around this topic.

Subject headings and genre

TEKNIK OCH TEKNOLOGIER Samhällsbyggnadsteknik Husbyggnad hsv//swe
ENGINEERING AND TECHNOLOGY Civil Engineering Building Technologies hsv//eng
Efficiency factors of space heating
hydronic panel radiator
hydronic floor heating
multilayer wall
numerical modelling
room control volume
decrement factor
time delay
heat conduction
heat convection
heat radiation
heat storage
thermal inertia
Euler solver
Newton-Raphson method
synthetic weather file
feedback and feed-forward control strategies
adaptive control
validation methodology
uncertainty bands
robustness of model predictions
thermostatic booth simulator
differential sensitivity analysis
transient model of panel radiator with multiple storage elements
active thermal mass
benchmark performance indicator
linear regression model
calibration through uncertainty bands
hybrid model of low-energy building: law driven + data driven
outdoor temperature compensation/heating curve
solar radiation model
finite difference method
heat equation

Added entries (persons, corporate bodies, meetings, titles ...)

Olofsson, Thomas,Professor,1968-Umeå universitet,Institutionen för tillämpad fysik och elektronik(Swepub:umu)thol0001 (thesis advisor)
Östin, Ronny,Senior lecturer (associate professor)Umeå universitet,Institutionen för tillämpad fysik och elektronik(Swepub:umu)roos0002 (thesis advisor)
Soleimani-Mohseni, Mohsen,Senior lecturer (associate professor),1968-Umeå universitet,Institutionen för tillämpad fysik och elektronik(Swepub:umu)somo0008 (thesis advisor)
Sørensen, Bjørn Reidar,Prof.UiT, Norge Arktiske Universitet, Tromsø, Norway (opponent)
Umeå universitetInstitutionen för tillämpad fysik och elektronik (creator_code:org_t)

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