Infrared image of a test person in the Aachen Comfort Cube Copyright: EBC

Test person study with focus on thermophysiology in the Aachen Comfort Cube under constant and transient conditions


In this trial person study, experiments on the thermophysiology of humans under different and changing thermal environmental conditions are conducted in the Aachen Comfort Cube of the Institute of Energy Efficient Buildings and Indoor Climate (EBC). The characteristics age, gender and body mass index (BMI) of 48 test persons are examined with regard to their impact on thermophysiology and subjective sensation. For this purpose, surface temperatures on the skin of 25 body parts as well as heart rate and body core temperature in the ear are measured at regular intervals during the experiments. In addition to the physiological measurement values, local thermal sensation and local thermal comfort are logged every 20 minutes by means of electronic questionnaires. Additionally, infrared sensors are placed in the test room in order to record surface temperatures of the outer clothing layers as well as uncovered body parts.

After an acclimatization phase in the test hall of the EBC, the test persons are positioned in the preconditioned test room in pairs. For the first hour, they are exposed to air and wall surface temperatures of 18 °C. The conditions are then changed to 28 °C for two hours before resetting temperatures to the initial value of 18 °C for a final hour. This basic approach for transient experiments was proposed by researchers Stolwijk and Hardy in 1966. Comfort models have been validated based on this very approach in numerous scientific publications.

The data gathered in this project provide a basis for the extension of the 33 Node Comfort Model (33NCM NOODLE) on the one hand, by an individualization function regarding the parameters age, gender, and BMI. On the other hand, the data serve the development of a simplified model, which can provide information about the physiological state of the human and thus as well about their comfort by means of affordable IR sensor technology. The long-term goal of the newly developed model is comfort-based control in office rooms by estimating the thermal comfort based on the infrared image of a person.



Duration: ~ 3 years   

Start: 01.02.2018   

End: 2021

Funding body: Heinz Trox Wissenschafts GmbH (


Rewitz, Kai © Copyright: Kai Rewitz


Kai Rewitz

Team Leader


+49 241 80 49629