The course of lectures on Building Physics provides an overview of the physical influences on a building. The section “thermal insulation” focuses on the basics of heat transfer, the creation of energy balances and the unsteady/transient building behavior. “Moisture protection” will take a closer look at hygrothermal influences on a building – in particular condensation and mold growth inside a building as well hygrothermal transport processes through components. The third section focuses on acoustic aspects, such as the rooms’ acoustic quality, soundproofing from the outside, as well as the question how users are affected by noise. Finally, the course of lectures will briefly address the aspects of fire protection, lighting, and urban physics.
Lecturer: Christoph van Treeck
Thermal Ergonomics - Student Survey
Indoor thermal comfort in buildings is usually assessed via the empirical calculation model of Fanger (1970). The model itself consists of two indicators, called Predicted Mean Vote (PMV) and Predicted Percentage of Dissatisfied (PPD). Both indices are used to describe the thermal sensation of a group of persons and their corresponding satisfaction with the physical environmental conditions. The model itself served as the base for the definition of building categories and comfortable operative indoor temperatures standardized in DIN EN ISO 7730 and EN ISO 15251.
The introduced experiment shows the assessment of thermal comfort of a large group of persons. In this regard, a statistically significant amount of persons is asked for their current thermal sensation. The latter is expressed as PMV-values between -3 (cold) to +3 (hot) with 0 as thermal neutrality. The averaged PMV of the experiment is +0.2. It results in a thermal dissatisfaction value (PPD) of 6 %. The latter is close to the maximum possible PPD of 5 % and indicates that the majority of the subjects felt thermally comfortable in the investigated lecture hall.