Several countries have many years of good experience with a simple monthly calculation method.
However, a calculation method using hourly time intervals is much better suited to deal with low energy buildings and innovative (dynamic) technologies, while also being better at evaluating indoor environmental quality which is an important aspect in the revised EPBD:2018.
To facilitate and stimulate the change over from monthly to hourly calculations, the new hourly method in EN ISO 52016-1 has been tailored in such a way that it does not require more input data from the user than the monthly method.
Also for the calculation of technical systems with their dependence on operational and climate parameters, an hourly method becomes simpler than a monthly method. A monthly method requires e.g. pre-calculated correction factors, to be derived from hourly considerations, which would have to be defined on a national basis depending on climate and technologies.
Read more at the page on EN ISO 52016-1 which includes also links to recent papers with further explanation on the subject.
2019.07.22