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Description
This research presents the heat rate kinetics of liquefied petroleum gas (LPG) within the LPG sensing process using metal oxide semiconductors (MOS) based on MgCexFe₂₋ₓO₄ (x = 0, 0.1, 0.2, and 0.3). Much has been reported on the detection of LPG using MOS, and anomalies in gas sensing were observed in terms of the electrical current and the operating temperature. Oscillation/Variation were detected on the electric current and operating temperature during the saturation stage. The operating temperature should be constant with time throughout LPG sensing in gas. These variations were found to correlate with the different LPG concentrations applied, ranging from 1,000 to 10,000 ppm.
The experimental data were analysed using Origin and Microsoft Excel to determine the electrical behaviour of the sensors under different scenarios. The air current (Ia) was found to be 6.53 × 10⁻⁶ mA. The highest response value was achieved by MgFe₂O₄ (399.24), while the lowest was recorded by the MgCe₀.₁Fe₁.₉O₄ sample (37.46). According to the analysis, the heat transferred amount (Q) during the sensing process is impacted by several factors, specifically: it is directly proportional to the temperature difference, total contact surface area, and transfer time but inversely proportional to the effective thickness of the water molecule layers.
By applying Fourier’s law of heat conduction, an equivalent relationship was derived to describe the rate of temperature change per unit time (Equation 8). This equation was used to estimate some parameters (ΔT = 50 °C and Δt = 23 s) of the first concentration(1000ppm) of the operating temperature, which could not be directly observed in the experimental data (Fig. 2).
Keywords: LPG sensing, MOS, Oscillation, MgFe₂O₄, Variation, Fourier’s law
| Apply for student award at which level: | MSc |
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