Last Friday in September was the day of the science in the Czech Republic. Heat Transfer and Fluid Flow Laboratory participated on the event “Noc vědců” (= Night of Scientists). The event is focused on introducing the current research to the general public. The research was presented across the Czech Republic since 6 p.m. until the midnight. Meanwhile, 1623 visitors came to Technical Museum in Brno where were presented the polymeric hollow fibres heat exchangers that are developed in Heat Transfer and Fluid Flow Laboratory.