Holographic Interferometry for Measuring the Effect of Thermal Modification on Wood Thermal Properties

Abstract

The paper focuses on the use of holographic interferometry in the research of thermal modification and its effect on the heat transfer from the wood surface to the surrounding air. In the experiment, spruce wood samples modified at 160 °C, 180 °C, 200 °C, 220 °C and an unmodified control sample were used. A radiant heat source was placed under the sample. The top of the sample represented the boundary where the observed heat transfer occurred. The temperature fields above the sample were visualized by real-time holographic interferometry and the heat transfer coefficient α was calculated from the obtained interferograms. During the heating of the samples, a decrease of the heat transfer coefficient was observed. The heat transfer coefficient of the control unmodified sample decreased from a maximum of α = 22.66 Wm–2K–1 to a minimum of α = 8.6 Wm–2K–1. In comparison with these values, the heat transfer coefficients of the modified samples treated at 160, 180, 200 and 220 °C, respectively, decreased to 99%, 93%, 68% and 51% of the maximal control value at the beginning of experiment and to 95%, 86%, 80% and 64% of the minimal control value by the end of the experiment. Moreover, an analysis of variance was used to determine the significance of the heat treatment effect on the heat transfer coefficient. A high significance (p < 5%) was observed between the control sample and the modified samples treated at 200 °C and 220 °C. Experiments with the use of holographic interferometry produced results consistent with previous studies conducted by different methods.

Maximum Power Point Tracking of Photovoltaic Generation System Using Improved Quantum-Behavior Particle Swarm Optimization

“…To further enhance the power generation of PV panels, future research endeavors may explore the potential impact of employing holographic interferometry to measure the heat transfer from the surfaces of various materials on PV panels to the surrounding air [43]. The algorithm proposed in this paper presents promising prospects for diverse renewable energy applications, with particular relevance to wind energy conversion systems [44].…”

Impact of Heat Treatment of Spruce Wood on Its Fire-Technical Characteristics Based on Density and the Side Exposed to Fire

“…Depending on the maximum temperature at which the wood is treated, its properties also change. Studies demonstrate that heattreated wood has several positive properties compared with untreated wood, such as increased biological resistance and resistance to weather and sunlight [2][3][4], reduction of equilibrium moisture content [4][5][6], reduction of the heat transfer coefficient [7], improved dimensional stability [8][9][10], reduction of some undesirable substances (resins, polysaccharides) [11,12], thermal insulation [6,13,14], and aesthetic properties in the form of a darker decorative colour [15][16][17][18][19]. The disadvantage is the deterioration of its mechanical properties [3,4,[20][21][22][23].…”