THE IMPACT OF HEAT STORAGE MATERIAL INTEGRATION IN AN EVACUATED TUBE COLLECTOR Original scientific paper
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This experimental research assessed the impacts of sensible and latent heat materials such as SAE 20W/40 (used engine oil), candelilla wax (CLW) and rice bran wax (RBW) in an evacuated tube solar air heater. Four distinct arrangements were studied: one without a thermal energy storage material (TESM), one with a sensible heat material (SHM), and two with latent heat materials (LHM), to enable comparative analysis. The maximum outlet temperature of air for ETC filled with engine oil was 108°C, for CLW 115°C and for RBW 133°C – all measured at 13:00 pm. However, without filling the TESM in the ETC, the outlet temperature was only 70 °C. The maximum temperature difference of air in the RBW material-filled ETSAH system was 94°C, whereas without TESM, the temperature was only 31°C at 13:00. The maximum efficiency of the ETSAH system was achieved when using RBW as a PCM rather than both CLW and used engine oil-filled TESM. Moreover, the efficiency of the system increases around 1.7 - 1.8 times when the velocity of air increases from 1.5 to 2.5 m/s.
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