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dc.contributor.authorHudjetz, Stefan
dc.date.accessioned2013-09-16T15:14:18Z
dc.date.available2013-09-16T15:14:18Z
dc.date.issued2012
dc.identifier.urihttp://hdl.handle.net/2086/9021
dc.description.abstractThe different technologies of passive cooling concepts have to rely on a good thermal coupling between a building’s thermal mass and indoor air. In many cases, the ceiling is the only surface remaining for a good coupling. Further research is necessary to investigate discrepancies between existing correlations. Therefore, the overall aim of the work described in this thesis is the investigation of heat transfer at a heated ceiling in an experimental chamber. Acoustic baffles obstruct the surface of the ceiling and impede heat transfer. However, there is nearly no published data about the effect of such baffles on heat transfer. Available results from simulations should be verified with an experimental investigation. Consequently, one of the primary aims of this work was to experimentally determine the influence of such acoustic baffles. A suitable experimental chamber has been built at Biberach University of Applied Sciences. The thesis describes the experimental chamber, the experimental programme as well as results from five different test series. With a value of ±0.1W/(m² K) for larger temperature differences, uncertainty in resulting convective heat transfer coefficients for natural convection is comparable to that of results from an existing recent experimental work often recommended for use. Additionally, total heat transfer (by convection and radiation) results are presented. Results are given for natural, forced and mixed convection conditions at an unobstructed heated ceiling. Furthermore, results for acoustic baffles in both an unventilated and a ventilated chamber are shown. Natural convection results show a very good agreement with existing correlations. Under mixed convection conditions, convective heat transfer at an unobstructed ceiling decreases to the limiting case described by natural convection. Installation of acoustic baffles leads to a reduction in total heat transfer (convection and radiation) between 20% and 30% when compared to the case of an unobstructed ceiling.en
dc.language.isoenen
dc.publisherDe Montfort Universityen
dc.subjectexperimental investigationen
dc.subjectacoustic bafflesen
dc.subjectceilingen
dc.subjectheat transferen
dc.subjectradiationen
dc.subjectconvectionen
dc.subjectconvective heat transfer coefficienten
dc.subjectCHTCen
dc.subjectnaturalen
dc.subjectmixeden
dc.subjectforceden
dc.subjectcorrelationen
dc.subjectfacilityen
dc.subjectchamberen
dc.subjectBiberach University of Applied Sciencesen
dc.titleExperimental Investigation of Heat Exchange between Thermal Mass and Room Environmentsen
dc.typeThesis or dissertationen
dc.publisher.departmentFaculty of Technologyen
dc.publisher.departmentIESDen
dc.type.qualificationlevelDoctoralen
dc.type.qualificationnamePhDen


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