Evaluation of simlified models for checking compliance with building regulations: Prediction of thermal comfort in dwellings

Homics, Viktors ; Kirkedal, Morten

4. term

Indoor Environmental and Energy Engineering, Master

2013

2013-06-07

256 pages

Formålet med dette afgangsprojekt var at evaluere forenklede modeller beregnet til kontrollere overholdelsen af det danske bygningsreglement vedrørende termisk komfort om sommeren. En spørgeskemaundersøgelse blandt danske virksomheder angav indledningsvist nødvendigheden af en forenklet model i den tidlige designfase, til at forudsige hvordan et givet bygningsdesign vil påvirke risikoen for overophedning i boliger. En forenklet model udviklet af Statens Byggeforskningsinstitut (SBi), beregnet til sådanne indledende vurderinger samt til at kontrollere overholdelsen af det danske bygningsreglement, er blevet evalueret. Forud for evalueringen er denne forenklede model, sammen med to yderligere metoder til forudsigelse af operative temperaturer i bygninger, sammenlignet i henhold til deres implementering og brug af randbetingelser og input data. Takket være en følsomhedsanalyse blev de vigtigste input parametre afsløret, hvilket gjorde det muligt at fokusere på forbedringer samt udvælge de mest fordelagtige randbetingelser. Efterfølgende blev modellernes beregningsproces evalueret ved at anvende ens randbetingelser og input data samt bruge parametervariation og betragte deres effekt på modellernes resultat. Slutteligt blev forenklede modeller med forskellige grader af kompleksitet i input samt beregningsproces evalueret ud fra kvalitetsaspekter ved at udføre termiske simuleringer i fem reelle boliger.

The main purpose of the present thesis was to evaluate simplified models intended for checking compliance with Danish Building Regulations regarding summer thermal comfort. A survey among companies initially specifies the necessity of a simplified in the preliminary design phase in order to predict how a building design will influence of risk of overheating in residential buildings. A simplified model developed by the Danish Building Research Institute intended for such preliminary estimation and for checking compliance with Danish building Regulations has been evaluated. Prior to the evaluation of this simplified model two additional methods to predict excessive operative temperatures in building are compared according to their implementation and usage of boundary conditions and input data. Thanks to sensitivity analysis the most important input parameters was revealed which made it possible to focus on improvements and select the most favourable boundary conditions. Subsequently, by implementing similar boundary conditions and input data for each of the considered simplified models an evaluation solely based on model calculation procedures was conducted by usage of changing input parameters and consider their impact in model output. In the end simplified models varying by difference in level of complexity in user input and calculation procedure are evaluated based on aspects of quality. This is based on five real buildings.

compliance ; thermal comfort ; sensitivity analysis ; simplified models ; BESTEST ; energy simulation ; lumped capacitance method ; Bo Adamson method ; EN ISO 13790 simple hourly calculation method ; factorial design ; comfort houses ; thermal capacity ; solar heat gains ; uncertainty analysis

Download
View record in AAU Student Projects