The analysis of research results concerning heat release rates of ship materials with regard to dynamic parameters of the research station
The analysis of research results concerning heat release rates of ship materials with regard to dynamic parameters of the research station Based on the results of author's research it was stated that significant differences between heat release rates measured according to ISO 5660-1 and FTP Code Part 5 (Res. A. 653 (16)) are not caused by measurement uncertainties. A basic factor determining the lack of correlation is treating the heat release rate in the category of static measurements in the normalized measurement methods. Taking into account dynamic parameters of the test station allowed the coincidence rate (reproducibility and correlation) of the results of heat release rates measured using different methods to be improved, without changing test stations and procedures. Author's research performed on 42 materials has revealed that the relative dynamic errors of the heat release rate measurements are significant (2%÷120%). The average value of these changes for the tested group of materials was equal to 39%.
Effect of instrument response time on heat release rate measurements
A linear hereditary integral technique provides simple analytic solutions for deconvoluting thermopile and oxygen consumption data to remove the effect of instrument response time on peak and integrated heat release rate values. A comparison of corrected and uncorrected thermopile and oxygen sensor data obtained on an Ohio State University (OSU) apparatus for various materials indicates that significant errors in peak and integrated heat release rate can result from delayed instrument response to repidly changing heat flows. However, correcting for temporal effects alone using this procedure does not account for differences between heat release rate values obtained by thermopile and oxygen consumption methods.
Analysis of heat-flux calorimeter signals
Abstract General results on the operation of heat-flux calorimeters are obtained from a hereditary integral formulation of the calorimeter response. The behaviors of heat-flux calorimeters at long time intervals after a thermal event are examined using final value theorems of Laplace transforms. Experimental confirmation of the resulting predictions suggests an analytic procedure for desmearing or inverting calorimeter signals without the need for specific models or computer numerical techniques. Particular solutions are obtained for instantaneous heat and heat flow corresponding to an apparatus function of interest in the practice of heat-flux calorimetry.