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M. Trauner, M. Schuss, U. Pont, A. Mahdavi:
"Thermal conditions and user interactions in office spaces - a case study";
Talk: Central Europe towards Sustainable Building 2016 - Innovations for sustainable Future, Prague, Czech Republic; 2016-06-22 - 2016-06-24; in: "(Printed) Proceedings of CESB 2016: Central Europe towards sustainable building 2016 - innovations for sustrainable future", P. Hàjek, J. Tywoniak, A. Lupisek (ed.); CESB16 - Eigenverlag der CESB16, Prague, Czech Republic (2016), ISBN: 9788027102488; Paper ID p.323-330, 8 pages.

This contribution analyses the thermal comfort and the user interaction in an office building with a hybrid ventilation system in Vienna. The offices are ventilated and air-conditioned by a central system featuring a thermal wheel for heat recovery. The central ventilation system is using pre-heating of the air and moisture exchange from exhaust to supply air. Additionally, the rooms are heated and cooled with radiators at the air outlets and by active ceilings in renovated offices. The fact that the building was partly retrofitted to a new setup of technical systems renders the building an interesting field case study. The new setup includes a heated ceiling, combined with the option of natural ventilation through window opening.
Therefore a wireless monitoring for thermal (air-temperature, air-humidity and ceiling temperature) and air quality parameters (carbon dioxide level) was installed. Additionally, window contact sensors and occupancy detectors were used to collect data of user interactions. Data was collected during the heating period 2015 (February to April) and analysed regarding the following points:
1. A comparison of objective (PMV, PPD) and subjective evaluation (questionnaires) of thermal conditions considering both offices with and without heated ceilings.
2. Performance analysis of the heat recovery device.
3. Correlation of user interactions (window openings) to room air temperature or humidity as well as air quality represented by the carbon dioxide values.
The data evaluation showed a good thermal performance of the offices in both cases. Correlation of user interaction was less then expected and not directly related to air quality. Based on the fact that the building was under permanent mechanical ventilation during the office hours, a dependency of window openings to the level of carbon dioxide could not be determined.

(no german version available) This contribution analyses the thermal comfort and the user interaction in an office building with a hybrid ventilation system in Vienna. The offices are ventilated and air-conditioned by a central system featuring a thermal wheel for heat recovery. The central ventilation system is using pre-heating of the air and moisture exchange from exhaust to supply air. Additionally, the rooms are heated and cooled with radiators at the air outlets and by active ceilings in renovated offices. The fact that the building was partly retrofitted to a new setup of technical systems renders the building an interesting field case study. The new setup includes a heated ceiling, combined with the option of natural ventilation through window opening.
Therefore a wireless monitoring for thermal (air-temperature, air-humidity and ceiling temperature) and air quality parameters (carbon dioxide level) was installed. Additionally, window contact sensors and occupancy detectors were used to collect data of user interactions. Data was collected during the heating period 2015 (February to April) and analysed regarding the following points:
1. A comparison of objective (PMV, PPD) and subjective evaluation (questionnaires) of thermal conditions considering both offices with and without heated ceilings.
2. Performance analysis of the heat recovery device.
3. Correlation of user interactions (window openings) to room air temperature or humidity as well as air quality represented by the carbon dioxide values.
The data evaluation showed a good thermal performance of the offices in both cases. Correlation of user interaction was less then expected and not directly related to air quality. Based on the fact that the building was under permanent mechanical ventilation during the office hours, a dependency of window openings to the level of carbon dioxide could not be determined.

hybrid ventilation system, thermal comfort, subjective/objective evaluation, user interaction