Experimental modeling of thermophysical processes on de-icing cornices using solar radiation energy
| Autor: | S. M Myrzina, K. V Ozerova, O. M Zverev, A. V Perminov |
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| Rok vydání: | 2022 |
| Předmět: | |
| Zdroj: | Construction and Geotechnics. 13:51-69 |
| ISSN: | 2687-0908 2687-0894 |
| Popis: | Removing icicles from the roofs of buildings is a major problem for most cities. The paper provides an overview of a large number of patented methods and devices for combating icicles and ice on the eaves of roofs. However, there are very few really manufactured and tested products. The aim of the work was to test experimental samples of anti-icing cornices using solar radiation energy in artificially created conditions. For thermophysical experiments, more than 30 models of cornices were made from different materials with different paint coatings. During the experiments, it was found that the black color RAL 9005 has the greatest absorption capacity, and the gray graphite RAL 7074 is very close to it. The blue RAL 5005 and green RAL 6029 have a lower absorption capacity. The red RAL 3000 has a noticeably lower absorption capacity than blue and green. The least heated in the sun was the white RAL 9003 cornice model and galvanized steel. The dependence of the absorption capacity of cornices on the degree of their roughness and the method of applying the paint coating is not revealed. Due to the energy of solar radiation, anti-icing cornices can have a temperature 40-45 °C above the ambient temperature. Even in the shade, the temperature of the black cornices exceeds the ambient temperature by 4-5 °C. The wind blowing at an average speed of 2.5 m/s reduces the temperature difference between the experimental cornices and the air in the shade by about 2 times. The presence of a stretch film on the part of the cornice that will be placed under the roof allows you to reduce heat loss by one and a half to two times. |
| Databáze: | OpenAIRE |
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