A comparison of winter heating demand using a distributed and a point source of heating with mixing ventilation

When a large enclosed space is heated from a localised source, the space may become vertically stratified in temperature. We develop a model for this stratification in the case of constant mixing ventilation, in which there is a fixed high level supply and extract of air and a point source of heatin...

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Bibliographic Details
Published inEnergy and buildings Vol. 55; pp. 332 - 340
Main Authors KUESTERS, A. S, WOODS, A. W
Format Journal Article
LanguageEnglish
Published Oxford Elsevier 01.12.2012
Subjects
Applied sciences
Building technical equipments
Buildings
Buildings. Public works
Computation methods. Tables. Charts
Energy management and energy conservation in building
Environmental engineering
Exact sciences and technology
Structural analysis. Stresses
Energy consumption
Mixing
Climatic engineering
Distributed system
Modeling
Energy usage
Winter
Heating
Experimentation
Ventilation
Energy demand
Distributed heating
Stratification
Mixing ventilation
Comparative study
Localized
Localised heating
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Summary:When a large enclosed space is heated from a localised source, the space may become vertically stratified in temperature. We develop a model for this stratification in the case of constant mixing ventilation, in which there is a fixed high level supply and extract of air and a point source of heating at low level, testing our model predictions with some new laboratory experiments. We demonstrate that with large ventilation flow or a small heat flux a strong two layer stratification develops in the space, whereas with low ventilation flux or large heat supply the stratification is weak. The presence of thermal mass weakens this stratification.
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ISSN:0378-7788
DOI:10.1016/j.enbuild.2012.07.045