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Experimental estimation of thermal emissivity for the roofing paper in blue colour

Zapałowicz Zbigniew, Walterowicz Anna

Archives of Thermodynamics

2019

Vol. 40, no. 3

181--194

Effective use of energy in various branches of economy is one of world trends in development of power engineering. Relevant energy consumption occurs during exploitation of buildings, so there is still potential to diminish it as far as heating, ventilation, and air conditioning are concerned. Particularly in summer season, the choice of respective roofing colour can play a decisive role for the heat flux transferred to the inside of the object. Decrease of heat flux causes a lower heat burden to the building and lower power consumption by the air conditioning systems. In winter, on the contrary, heat flux transferred to building’s interior should be higher, as a result, demand of energy for heating will be lower. However, calculations of the heat flux require that energy balance must be made for the object. Unfortunately, not all producers of roofing covers inform about the values of reflectivity and thermal emissivity of their products, which is, in turn, necessary for calculations. In the present paper, research methodology elaborated by authors is proposed for determination of thermal emissivity of roofing covers. The paper presents test stand, methodology, and research results for roofing paper in blue colour (as an example) for which the thermal emissivity is an unknown parameter.

Ocena strat ciepła kabiny pasażerskiej podczas eksploatacji samochodu osobowego w okresie zimowym

Styła S., Wróbel K.

Logistyka

2011

nr 3

W artykule przeprowadzono badania samochodów osobowych, pod kontem wyznaczenia miejsc, w których występują największe straty ciepła. Pojazdy te były eksploatowane przez długi okres czasu (od kilku do kilkudziesięciu lat). W celu określenia strat ciepła, wykonano badania termowizyjne poszczególnych elementów konstrukcyjnych pojazdów. Ponadto w artykule zaprezentowano procedurę postępowania podczas badań, a także sposoby interpretacji uzyskanych wyników.

The purpose of the present article is to describe the research of passenger cars carried out in order to determine their areas characterized by the highest heat losses. These vehicles were operated during a long period of time (several years or even several decades). The infrared tests have been performed for individual structural elements of the vehicles to determine the heat loss. Furthermore the article contains the presentation of the procedure applied in course of the research and methods of interpretation of the obtained results.