Is lava rock a good heat storage medium?

In this study, a new type of porous and sensible heat storage medium called -lava rock was introduced. Lava rock has superior thermal and physical properties compared to the material used in DPSAH literature. This study aims to evaluate the effectiveness of the DPSAH system using lava rock.

What is the thermal efficiency of a lava rock at 1000 W/m2?

At 1000 W/m 2 solar irradiance, C1-DPSAH, C2-DPSAH, and C3-DPSAH exhibited higher thermal efficiencies ranging from 18.2% to 65.02%, 25.27% to 72.17%, and 26.28% to 76.41%, respectively. In the absence of lava rock (C1-DPSAH), the plate temperature (Tp) of 91.3 °C was observed at (m) ̇of 0.06 kg/s under 1000 W/m2 solar irradiance.

Can lava rock be used as a heat storage double-pass solar air heater?

The present study used lava rock as the porous medium and sensitive heat storage double-pass solar air heater for thermal performance improvement. The experiment was performed on three sets of configurations: (i) DPSAH with no lava rock, C1-DPSAH, (ii) DPSAH with 50 % lava rock bed, C2-DPSAH, (iii) DPSAH with 100 % lava rock packed bed, C3-DPSAH.

What is lava rock used for?

Lava rock is used in the second air channel as a heat storage material and as a heat transfer enhancement technique for the working fluid, air. The experimental setup's solar collector (absorber plate) has dimensions of 2.3 m in length and 0.54 m in width.

What is the thermal distribution of lava rock in a heater?

In contrast, the temperature of lava rock remains consistent throughout the charging and discharging process, making good thermal distribution in the heater. Fig. 12. C2-DPSAH Lava Rock charge/discharge at ṁ = 0.02 kg/s for I = 590, 800, and 1000 W/m 2.

Can lava rock be used as a solar air heater?

Lava rock's integration into the double-pass solar air heater significantly lowered the temperature of the absorber plate as compared to the conventional double-pass solar air heater, showcasing the thermal storage properties of the lava rock.