Study of the Effect of Temperature Differences on the Overall Thermal Transfer Value of buildings

This study was conducted to search for the relationship to predict values of Overall Thermal Transfer Value (OTTV) of the building at different time in one day to determine the effects of equivalent temperature difference for opaque walls (TDeq), and temperature difference for glass windows (ΔT) affecting OTTV value: A case study of the sixth floor of Pienvichitr Building, Faculty of Engineering, Khon Kaen University, where the new TDeq and ΔT values obtained from the calculation using the data of the temperature and the solar radiation in Khon Kaen Province. It is based on the reference direction of the building from 06.00 am. - 06.00 pm. The results showed the OTTV value with the highest value was at 02.00 pm., and the minimum was at 06.00 am. The developed parameters used to predict the OTTV with high accuracy compared to the current parameters according to the rules of the Ministerial regulations on building design used. This is approximately 6.8% of the difference, but the OTTV can be taken to improve energy efficiency in the building further.