The primary purpose of any building design should be to achieve the desired parameters of the indoor environment. However this is not the outcome in all cases. Therefore, as part of every design, a comprehensive evaluation of the indoor microclimate should be conducted. The evaluation should be based on two criteria. The first, the physical-physiological that enables the indoor environment to be evaluated from the viewpoint of the physiology of the human organism and the second, the physical-psychological that makes it possible to evaluate the impact of the environment on the psychological impact of the individual components of the environment.
The impetus for this work were difficulties that arose from the application of optimal operative temperatures based on Predicted Mean Vote (PMV) in order to derive credible values for new or revised standards, namely the proposed European Standard prEN 4666:2009, Aerospace Series, Aircraft Integrated Air Quality and Pressure Standards, Criteria and Determination Methods. The need to revise the Government Directive No.361/2007 Code of the Czech Republic led directly to the commissioning of research, the results of which are reported in this paper. Part 1 contains the theoretical basis.