The main aim of the diploma thesis is the observation of influence of selected physical and geometric factors that influence the absorption of heat radiation. Diploma thesis includes the theoretical part divided into four chapters. The first chapter of thesis is aimed to the knowledges about Sun and solar energy, including the division of solar radiation and its practical use. Second and third chapters of diploma thesis are devoted to the methods of heat transfer, mainly with focus on the heat transfer by radiation and its physical laws. The final chapter of theoretical part is aimed to the theory of thermovision measurement. Practical part of diploma thesis contains the description of experimental device, measurement methodology and used equipment. Practical part of diploma thesis includes the processing and evaluation of measurement results which are intended to determine the influence of selected factor onto absorption of heat radiation.