Open AccessSelected Problems of Heat Transfer Measuring by Hotbox Apparatus in Climate Chambers
Author(s) -
Radoslav Ponechal,
Peter Juráš
Publication year - 2019
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/661/1/012079
Subject(s) - calibration , thermal , thermal resistance , sample (material) , materials science , environmental science , nuclear engineering , constant (computer programming) , polystyrene , heat transfer , measuring instrument , mechanics , thermodynamics , composite material , physics , computer science , engineering , polymer , quantum mechanics , programming language
Hotbox measurements are used for obtaining U-values of homogenous or non-homogenous samples in climate chambers for some time. With constant increase of the thermal resistance and lowering the thermal loss arise the problem of these measurements. This is caused by the limited minimal wattage of the hotbox. This paper deals with the measurement in climate chamber, which purpose was to made calibration of the chamber and various measurements equipment. The calibration was made with usage of sample with high thermal resistance, extruded polystyrene. Described problems are chamber and hotbox limitation, sensors accuracy and high thermal resistance of the sample.