Thermal Radiation Lab Report
Thermal Radiation
Leia Angelie Z. Baccay1, Brigette Elizabeth L. Fernandez1, Emmanuel L. Hipe1, Kim Anne Marie M. Taroy1
1 University of the Philippines Diliman, Quezon City
Abstract. This study aimed to investigate heat transfer through radiation by changing different parameters which are temperature, aperture width, and the material of the aperture plates. The temperature was varied by adjusting the voltage supply of the heat source with increments of 1/4 of the maximum. The aperture width was varied from 10 to 50 mm with increments of 10 mm. On the other hand, the aperture materials that were examined are styrofoam, car insulator, and aluminum foil. The Stefan-Boltzmann Law was verified by this experiment since the linear fit of the data, radiation vs. temperature^4, resulted in high R2 which are 0.9981 and 0.9676 for the two trials. It was also found out that the aperture width is directly proportional with radiation but only limited to a maximum value. The emissivity of the aperture materials were calculated to be 0.003969, 0.003502 and 0.000467 for Styrofoam, car insulator, and aluminum foil, respectively; thus, shows that Styrofoam radiated heat most efficiently. This experiment can be further improved by using a completely closed room and adjusting the
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Introduction
Every substance in existence produces electromagnetic waves related to its internal energy. This electromagnetic radiation occurs ubiquitously and takes many forms. One of which is as heat or light, a type of electromagnetic radiation known as thermal radiation. (Siegel and Howell, 1992)
Thermal radiation is a means of heat propagation without requiring a medium for transfer. It is a result of turbulence in the thermal properties of the substance’s molecules. (Perry, Green and Maloney, 1997) Many industrial processes of heating and cooling involves this type of electromagnetic
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