New Zealand’s new weather data – how different?

The Test Reference Year (TRY) weather file was developed in 1993; in 2009 the Typical Meteorological Year (TMY) became the new standard weather file to use in energy based simulations. The TRY weather file has been used in the development of New Zealand’s Building Codes and Standards that are still current today. This paper describes the differences between the two weather files and how they influence the results of the energy consumption and thermal performance calculated through simulation. This comparison has been made with reference to both residential and commercial buildings.