English

This paper reports on the simulation of the indoor thermal environment and energy demand of an Airport terminal space in the UK. It compares the performance of a mixed conditioning system (MC) and a displacement conditioning system (DC) in the airport terminal, under two different control strategies, through a coupled TRNSYS-FLUENT quasi-dynamic simulation. TRNSYS simulates the AC unit and control systems, while FLUENT simulates the airflow inside the terminal space.

This paper describes the measurement of wind velocity and pressure difference between that inside and outside of a single sliding door at open–close operation, and describes CFD analysis using measured pressure difference, aiming at the development of a CFD analysis approach considering opening and closing of a sliding door. Comparison with measurements verified that the analysis can reproduce unsteady phenomena observed in measurement in general. 

This paper aims to evaluate the accuracy and strength of a new approach that automatically calculates the heating demand of whole district areas, modelled in 3D with the open standard CityGML. For this purpose, two residential districts in Ludwigsburg and Karlsruhe have been chosen as case studies. To evaluate the accuracy of the model, the simulation results were compared to real measured consumption data and the model uncertainties were analysed.

A sensitivity study is conducted with TRNSYS 17 to quantify the influence of different convection correlations during night ventilation on the thermal comfort. Furthermore, three other parameters were varied as well: the air change rate at night, the internal gains, and the accessibility of the thermal mass in the ceiling. The influence of using the Richardson number as correlation selection criteria is investigated.

This paper presents the ground effective slab model used in AccuRate’s simulation engine for house energy star rating in Australia. By comparing AccuRate’s predictions with the results reported in the IEA BESTEST, it is demonstrated that for uninsulated slab-on-ground buildings, AccuRate’s ground model performs satisfactory considering the balance between calculation speed and accuracy. Potential improvement in AccuRate’s ground model has also been recommended for further development.