Heat Utilization Characteristics of Two Sensible Heat Storage Vegetable Oils for Domestic Applications
Abstract
:1. Introduction
2. Methodology
2.1. Charging and Discharging Experiments: Simulation with Electrical Energy
2.1.1. Experimental Equipment
2.1.2. Temperature Monitoring
2.2. Performance Analysis of Sunflower Oil and Roki Oil
3. Results
3.1. Thermal Profiles
3.2. Thermal Performance Parameters
4. Conclusions
- The average energy stored was reduced because of slightly lower storage temperatures attained with larger loads for both pots. However, the average energy stored for Roki oil (595–524) kJ was higher compared to that of sunflower oil (591–437) kJ because of the higher storage temperatures attained by Roki oil.
- The average heat utilization energy and average heat utilization efficiency values were dependent on the water heating load. The average heat utilization efficiency increased with the increase in the water heating load.
- Roki oil showed higher average heat utilization energies (150–304) kJ, and higher average heat utilization efficiencies values (0.25–0.57) compared to sunflower oil, which showed (148–241) kJ and (0.25–0.49), respectively.
- The use of nanoparticles in Roki oil to improve its thermal conductivity.
- Experimental tests with solar energy using solar cookers for a practical solar cooking application.
- Investigating the combined use of vegetable oils and PCM to increase the thermal energy storage density, thus, improving the thermal performance.
- Comparing non-edible oils with Roki oil as sensible heat storage materials. It should be noted that non-edible oils are not food grade and will contaminate the food if spillages occur.
- Testing and comparing higher cooking loads with lower cooking loads (1.0–2.5 kg) were presented in this paper. The higher cooking loads, however, resulted in slower cooking and lower cooking temperatures, which might not be very ideal.
- Calculating heat losses.
Author Contributions
Funding
Data Availability Statement
Conflicts of Interest
References
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Property | Sunflower Oil | Roki Oil |
---|---|---|
Density (g cm−3) | 0.915 | 0.909 |
Specific heat capacity (J g−1 K−1) | 1.863 | 1.888 |
Thermal conductivity (W m−1 K−1) | 0.163 | 0.170 |
Thermal diffusivity (mm2 s−1) | 0.095 | 0.095 |
Sound velocity (m s−1) | 1453.100 | 1446.100 |
Viscosity (mPa s) | 57.000 | 82.200 |
Refractive index | 1.472 | 1.465 |
Isentropic compressibility (Pa−1) | 5.2 × 107 | 5.3 × 107 |
Isobaric thermal expansion (K−1) | 7.65 × 104 | 7.70 × 104 |
Test Case (Roki Oil, Sunflower Oil *) | Heated Load (kg) | Average Energy Stored (kJ) | Average Heat Utilization Energy (kJ) | Average Heart Utilization Efficiency (-) |
---|---|---|---|---|
Case 1 | 1.0 | 595, 591 * | 150, 148 * | 0.253, 0.251 * |
Case 2 | 1.5 | 530, 497 * | 226, 156 * | 0.426, 0.314 * |
Case 3 | 2.0 | 529, 457 * | 289, 192 * | 0.547, 0.421 * |
Case 4 | 2.5 | 524, 437 * | 304, 241 * | 0.574, 0.485 * |
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Abedigamba, O.P.; Mndeme, S.F.; Mawire, A.; Rukaaya, M. Heat Utilization Characteristics of Two Sensible Heat Storage Vegetable Oils for Domestic Applications. Sustainability 2023, 15, 6825. https://doi.org/10.3390/su15086825
Abedigamba OP, Mndeme SF, Mawire A, Rukaaya M. Heat Utilization Characteristics of Two Sensible Heat Storage Vegetable Oils for Domestic Applications. Sustainability. 2023; 15(8):6825. https://doi.org/10.3390/su15086825
Chicago/Turabian StyleAbedigamba, Oyirwoth P., Sayuni F. Mndeme, Ashmore Mawire, and Musa Rukaaya. 2023. "Heat Utilization Characteristics of Two Sensible Heat Storage Vegetable Oils for Domestic Applications" Sustainability 15, no. 8: 6825. https://doi.org/10.3390/su15086825