Paper Conference

Proceedings of ASim Conference 2012: 1st Asia conference of IBPSA-China, Japan, Korea


Evaluation of thermal conditions in a secondary school building in middle east: a comparison study of computed and measured conditions

Sahar Zahiri, Hasim Altan

Abstract: To improve the physical comfort and learning efficiency of the students in classrooms, it is important to evaluate the thermal conditions of indoor environments in school buildings. This paper presents a series of field studies conducted in a female secondary school in Tehran, Iran, by using physical measurements and computer modelling. The field studies assessed thermal conditions of two classrooms during lesson hours in the warm spring period of April/May for one week. The thermal comfort variables such as indoor air temperature and relative humidity were measured with the use of HOBO data loggers in various floors. The study also evaluates the thermal performance of the classrooms using an environmental analysis software package, which in this case is DesignBuilder (DB). The simulation tool has been used to assess the thermal performance of the classrooms in order to improve the indoor environments of the typical school building. Furthermore, a comparative analysis was performed on the result of field measurements and the building simulation modelling from the classrooms that were located on first and second floors. In the study, the differences between simulation predictions, field measurements and the parameters that caused uncertainty in simulation modelling have been analysed. In addition, the pros and cons of using the simulation tool have been discussed and the issues within the development of thermal simulation modelling have been further described. The study shows that the greatest difference in the results between the measurements and the simulation has been caused by the users’ behaviour and the outside climate conditions. Converting the actual outside climatic data into the simulation tool has a significant influence on the accuracy of the simulation results compared to the average climatic data used in the simulation tool, which is provided by default. The findings indicate that DesignBuilder is a satisfactory simulation tool which can be used to perform building environmental simulation analysis.
Pages: 331 - 338