Bachelor's thesis Sascha Behrendt

Experimental investigations to evaluate the thermal comfort in a highly modular test room

Illustration of the comfort cube used for the measurements Copyright: EBC Illustration of the comfort cube used for the measurements

The evaluation of thermal comfort in indoor air flow gets increasingly complex because of new ventilation concepts. With the help of test persons different ventilation concepts in interior rooms can be evaluated.

In this thesis different ventilation concepts are investigated. Test persons are sitting in a highly modular test room in which different boundary conditions can be set to a wide range. Also they have to evaluate the thermal comfort in a questionnaire.

The results can be used to check and improve existing comfort models. In order to predict the thermal comfort for different boundary conditions, comfort models are used.

In the first part of this thesis theoretical principles for used ventilation concepts and the thermal comfort are presented. In the second part the test room is described and in the third part the structure of the questionnaire is shown. In the fourth part the test cases, which are described in the following paragraphs, are presented.

In the first test case displacement ventilation is investigated. Therefore cool air is blown in on floor level. The air is heating up at heat sources by convection and rises to the top. Vertical temperature gradients of 1 K/m, 4.5 K/m and 8 K/m between 0.1 m and 1.1 m will be investigated. The mean temperature is also kept constant and set to approximately 23 C.

In the second test case mixed ventilation is examined. The air is blown in with a swirl diffuser on ceiling level. Air temperatures of 20 C, 23 C and 26 C will be maintained in the whole test facility.

The third test case is a consequence of the first case because the wall temperature has to be set up to 10 C higher than the air temperature for the temperature difference of 8 K/m. Because of this the radiation has an influence which probably has an effect on the evaluation. Therefore the first test case will be repeated with isolation in front of the side walls.

In the last part of this thesis the test cases will be compared among themselves and with the norm DIN EN ISO 7730 which includes different aspects of thermal comfort.