Reference : Energy efficiency and indoor aire quality os seminar rooms in older buildings with an...
Scientific journals : Article
Engineering, computing & technology : Energy
Sustainable Development
Energy efficiency and indoor aire quality os seminar rooms in older buildings with and without mechanical ventilation
Maas, Stefan mailto [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Engineering Research Unit >]
da Cruz Antunes, Joël mailto [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > >]
Steffgen, Georges mailto [University of Luxembourg > Faculty of Language and Literature, Humanities, Arts and Education (FLSHASE) > Integrative Research Unit: Social and Individual Development (INSIDE) >]
John Wiley & Sons
October 2019, Heft 5
United Kingdom
[en] indoor climate ; mechanical versus natural ventilation ; thermal comfort, PMV, PPD
[en] The present paper reports on an experimental study performed in a seminar room of the University of Luxembourg in a building of the 1970ies without a major renovation. This lecture room is typical for this building period and has a capacity of 60 seats. It is equipped with a mechanical ventilation system that is normally in operation on workdays for 11 hours a day in semester periods (8:00-19:00h), while windows can be opened manually. A Blower-Door-Test revealed that the room is not airtight. During a year, the ventilation system was shut “on” and “off” in periods of some weeks and the consumed final-energy was measured, as well as the indoor climate assessed by physical and psychological measurements. For instance, the measured CO2 concentrations are marginally better with the ventilation system "on", which was not perceived in any way by the occupants during the investigations. It was not possible to properly identify the impact of ventilation on the consumed heat-energy, as the room could not be thermally separated from the rest of the building. But with the system “on” there was a clear increase in consumed primary energy due to the electric consumption of the fans. No relationship between the perceived percentage of dissatisfied and perceived climate could be observed. It is concluded that the typical normal operation modus is questionable for seminar rooms in older buildings with variable occupancy and that a simple shut down or semi-automatic user controlled modus by low-cost retrofit seems advantageous.
University of Luxembourg - UL
Research Unit of Engineering Sciences
Researchers ; Professionals ; General public

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