Kristiana, Lisa and Manurung, Auralius (2021) An Energy Balance Model for a Small Educational Thermal Device. ELKOMIKA: Jurnal Teknik Energi Elektrik, Teknik Telekomunikasi, & Teknik Elektronika, 9 (2). pp. 333-343. ISSN 2338-8323 (cetak) dan 2459-9638 (elektronik)

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Abstract

This paper presents a small thermal device that has been developed for collegelevel teaching purposes. The developed device is equipped with one heater and one fan. An energy balance model is used to model the device and the parameters are calculated accordingly, such as heat capacity, emissivity and heat transfer coefficient. Additionally, we also quantify how the speed of the fan affects the heat transfer coefficient by using optimization methods to identify all the unknown parameters of the model. The results show that an energy balance model, which includes convection and radiation, can fit the dynamics of the device very well with a maximum absolute error of about 9ºC. However, during the validation process, the derived model gives a larger maximum absolute error of about 16ºC, which happens at high temperatures. As for the fan, we find that the speed of fan and the resulting heat transfer coefficient are likely to be linearly related.

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