Projects per year
on both subjective data from interviews as well as on objective data from physical measurements. The analysis includes data collected in 14 German office buildings from the ProKlimA-Survey. The analysis of the interviews shows that occupants in naturally ventilated office buildings are significantly more often satisfied with their thermal environment than occupants in
air-conditioned buildings. Several non-thermal parameters influence thermal comfort. The impact of the non-thermal variables depends on the type of ventilation and the perception of the indoor environment temperature (hot or cool).
In the literature it is mentioned that occupants in naturally ventilated offices accept a wider range of indoor temperatures than occupants in air-conditioned offices. The bandwidths of temperature found in the present work are the same for both types of ventilation. Relevant literature comprises four major approaches. On the one hand there is the PMV-Model by Fanger and its modification by Mayer. On the other hand there are two adaptive approaches: a Dutch guideline and the ASHRAE approach.
Both adaptive approaches determine the indoor comfort temperature dependent on a mean outdoor temperature.
The suitability of the four approaches for assessing and predicting thermal comfort in naturally ventilated and air-conditioned offices was investigated. The closest agreement between predictions and interviews for air-conditioned
offices is achieved by Mayer’s modification of the PMV-Model. For naturally ventilated offices the ASHRAE approach shows the best match.
So far Fanger's PMV-Model is the standardized method to assess thermal comfort in Germany and Europe. The results demonstrate that new guidelines
for assessing and planning of thermal comfort in office buildings are required for both natural ventilation and air-conditioning.
|Translated title of the contribution||Thermal Comfort - Natural Ventilation versus Air-Conditioning in Office Buildings from the Occupant's Point of View|
|Place of Publication||Munich|
|Publisher||Technical University of Munich|
|Number of pages||179|
|Publication status||Published - 2005|
- Thermal comfort
- personal control
- Post-occupancy evaluation
- Logistic regression
- interrelation of indoor environment parameters
- non-physical impact parameters
- occupant perception
- user perception
- perceived control
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- 2 Finished
01/08/1995 → 30/09/2018
01 - Human well-being and technology in architecture: Overview on projects at my previous affiliations and actual projects
01/08/1995 → 30/09/2018
Hellwig, R. T., Teli, D., Schweiker, M., Choi, J-H., Lee, J. M. C., Mora, R., Rawal, R., Wang, Z. & Al-Atrash, F., 19 Apr 2022, A Handbook of Resilient Thermal Comfort. Nicol, F., Rijal, H. B. & Roaf, S. (eds.). Routledge, (Routledge International Handbooks).
Research output: Contribution to book/anthology/report/conference proceeding › Book chapter › Research › peer-review
Indoor environment in office buildings - Perception of personal control und use of adaptive opportunities at workplacesAl-Atrash, F., Hellwig, R. T. & Wagner, A., Oct 2022, In: Bauphysik. 44, 5, p. 264-281 bapi.202200026.
Research output: Contribution to journal › Journal article › Research › peer-review
Teli, D., Hellwig, R. T., Schweiker, M., Choi, J-H., Lee, J. M. C., Mora, R., Rawal, R., Wang, Z. & Al-Atrash, F., 1 Nov 2020, Proceedings 16th Indoor Air 2020. ABS-0556
Research output: Contribution to book/anthology/report/conference proceeding › Article in proceeding › Research › peer-review