Olfaktorische Bewertung von Emissionen aus Bauprodukten
Aachen / E.ON Energy Research Center, RWTH Aachen University (2013) [Dissertation / PhD Thesis]
Page(s): IX, 98 S. : Ill., graph. Darst.
In addition to thermal comfort air quality is an important factor which affects well-being, satisfaction and often the health of the users indoors. An important part of air quality is the perceived air quality, using a human panel and their noses as the measurement-instrument. Perceived air quality is focused on the olfactory impact of odor-relevant emissions, emitted from various sources indoors on the users. This work investigates the relationship among the olfactory measurement categories of the perceived air quality: acceptance, hedonic tone, perceived intensity, unreasonableness, percentage dissatisfied-value (PD-value) and odor-descriptors. It pursues the goal to develop a model that allows the evaluation of acceptance and/or PD-value from perceived intensity in consideration of the hedonic tone assessed by a small panel group. At first, the book explains the theory of perceived air quality estimation and gives a brief overview about air quality guidelines and standards (chapter 2). The air-quality assessment methods and the evaluation procedures used for the experimental investigations of this work are explained in chapter 3. The first section of experiments with a human panel (chapter 4) includes investigations with single-component chemical reference substances (reproducible basic odors). In addition to those experiments, some combinations of two basic odors are performed. Additionally, the impact of relative air humidity on acceptance and perceived intensity is investigated. The second part of experiments (chapter 5) deals with complex odor mixtures that are found in building products which are investigated in emission chambers. Building constructions usually consist of different materials and do therefore constitute a large set of possible material combinations. The olfactory perception of odors from building products investigated in emission chambers might therefore be different to that of building products found in real rooms. Experiments are performed in order to determine such differences (chapter 6). Chapter 7 shows the comparison of results of single substances with the odor mixtures from building products. Additionally, two models for the relationship among perceived intensity, hedonic tone and acceptance will be presented. The first model is used for basic odors the second one for odor mixtures (building products). These models enable the evaluation of acceptance/PD-value from perceived intensity and hedonic tone assessed by a small panel group. Finally, the odor-mixtures model is tested with input data that have not been used before (section 7.3 in chapter 7). It is shown that the odor-mixture model is able to determine the expected acceptance range for building products from a given perceived intensity and hedonic tone. However, this model is only partly suitable for applications in room air quality investigations. This model will need adaptation if the investigated air sample includes additional odors from humans, furnishings or foodstuff.
- URN: urn:nbn:de:hbz:82-opus-45289
- REPORT NUMBER: RWTH-CONV-143713