Experimental analysis of radiator thermal characteristics

U sklopu ovog rada provedena je analiza toplinskih karakteristika dva različita člankasta radijatora. Analiza je provedena u Laboratoriju za toplinu i toplinske uređaje prema normi HRN-EN 442-2 za tri različite temperature ogrjevnog medija. Također bilo je potrebno provesti mjerenja brzina i temperatura zraka oko i između rebara radijatora te temperature prednjih ogrjevnih ploha radijatora. Uvodno je dan opis, glavne karakteristike te osnovna podjela radijatora. Nadalje opisan je postupak ispitivanja iz norme HRN EN 442-2. Dan je opis mjerne linije te samog mjerenja mjernom opremom koja se sastojala od anemometra sa žarnom niti, termoparova i termografske kamere. Rezultati mjerenja su podvrgnuti analizi te su korišteni za proračun koeficijenta prijelaza topline. Na kraju je dana usporedba rezultata dobivenih eksperimentalno za dva različita radijatora.In this work an analysis of the thermal characteristics of two different column radiators was conducted. Analysis was conducted in the Laborathory for heat and thermal devices according to norm HRN EN 442-2 for three different temperatures of working fluid. This work also contains measurements of velocities and temperatures of air around and in between radiator ribs and temperatures of front surfaces of radiators. This project work begins with an introduction where the elements of the test room and the standard of HRN EN 442-2, measuring line and measuring devices which consisted of hot-wire anemometer, thermocouples and thermographic camera are described. Results of the measurements were analysed and used in the calculation of the heat transfer coefficient. In the end experimental results for the two radiators are compared