Performance Assessment of a Box Type Solar Cooker Using Jatropha Oil as a Heat Storage Material

Nébié, Jacques; Zongo, Sidiki; Tubreoumya, Guy Christian; Zongo, Augustin S.; Konkobo, Ilyassé; Bagré, Boubou; Diané, Ali; Daho, Tizane; Igo, Serges W.; Zeghmati, Belkacem; Béré, Antoine

doi:10.4236/epe.2022.142005

Cited by 3 publications

(3 citation statements)

References 17 publications

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“…The conversion of water heating panels (here, termed HPs) to be used with oil for high temperature systems can be an option, and, in particular, evacuated tube systems have the potential to reach quite high temperatures. Such systems are passive (natural circulation) and static (no solar tracking), and some practical tests so far show stagnated temperatures reaching about 140 − 170 °C [11]. The energy collection efficiency is, however, reduced as the storage temperature increases.…”

Section: Heat Collection Methodsmentioning

confidence: 99%

Heat Storage for Cooking: A Discussion on Requirements and Concepts

Nydal

2023

Energies

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Methodologies for direct and indirect solar energy for cooking are discussed. Clean and renewable energy solutions for cooking are, in particular, in demand in the sub-Saharan region where fuel wood is the main source of energy for a large part of the population, in particular in off-grid communities. As solar radiation is intermittent, energy storage solutions are required to provide cooking power during off-sun hours. Electrical batteries can be feasible for low-power applications (lights, electronics, and chargers) but tend to be costly and short-lived solutions for high-power cooking requirements. Heat battery concepts are discussed here together with prototype examples of latent and sensible heat storage solutions which have been laboratory tested for cooking and frying. Simplified computational comparisons between latent and sensible heat storage options show that oil and rock bed sensible heat systems, with a natural convection heat transfer, can be designed to provide variable cooking power levels. Oversized sensible heat storage systems can approach the near constant temperature and heat storage properties of a latent heat system. Latent heat storage systems can be more suitable for frying than for cooking applications.

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Section: Heat Collection Methodsmentioning

confidence: 99%

Heat Storage for Cooking: A Discussion on Requirements and Concepts

Nydal

2023

Energies

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“…TES systems combined with solar cookers can be advantageous during non-sunshine periods. In recent years, researchers have extensively investigated solar cookers integrated with TES systems [19][20][21][22][23][24][25][26][27][28][29][30][31][32]. Saxena and Karakilcik evaluated a solar cooker with low-cost storage material [19].…”

Section: Introductionmentioning

confidence: 99%

“…The results obtained showed that the overall thermal efficiency of the modified solar box cooker was seen to be 53.81% more than that of a conventional solar box cooker. The performance assessment of a box-type solar cooker using Jatropha oil as a heat storage material was completed by Nébié et al [26]. Experiments were carried out to evaluate the cooking power and the efficiency of the solar box cooker during off-sunshine periods.…”

Section: Introductionmentioning

confidence: 99%

Experimental Energetic and Exergetic Performance of a Combined Solar Cooking and Thermal Energy Storage System

2022

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Most solar cookers usually perform a single task of solely cooking food during sunshine hours. Solar cookers coupled with thermal energy storage (TES) material for off-sunshine cooking are usually expensive and require complex engineering designs, and cannot be used for dual purposes, for example, solar water heating and cooking. In this paper, a solar cooker that can perform dual tasks of cooking as well as storing thermal energy to be used during off-sunshine periods is presented. The experimental setup is composed of a parabolic dish, a solar receiver coupled with a flat plate and an oil-circulating copper coil for charging and discharging a storage tank. The objective of the experiment is to evaluate the energy and exergy thermal performance parameters of the dual-purpose system during charging and discharging cycles. The effect of the flow rate and the mass of the load are investigated while using sunflower oil as both the heat transfer fluid and the storage material. Charging and discharging experiments are conducted using four different flow rates (2, 3, 4, 5 mL/s), and with different masses (0.5, 1, 1.5, 2.0 kg) with water and sunflower oil as the test loads. The charging results show that the average energy and exergy rates as well as their corresponding efficiencies increase with an increase in the charging flow rate. On the other hand, the increase in the mass load tends to decrease marginally the average charging energy and exergy rates for water, and their corresponding efficiencies. For sunflower oil, the average charging energy and exergy rates and efficiencies showed a more pronounced decrease with an increase in the mass. Water generally shows higher charging and discharging energy and exergy efficiencies compared to sunflower oil with an increase in the flow rate. For discharging results, the correlations between the energy and exergy thermal performance parameters with respect to the flow rate and the heating load are not well defined possibly due to different initial storage tank temperatures at the onset of discharging and the inefficient discharging process which needs to be optimized in future.

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Heat Utilization Characteristics of Two Sensible Heat Storage Vegetable Oils for Domestic Applications

et al. 2023

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The heat utilization characteristics of two different sensible heat storage vegetable oils for domestic applications are evaluated. Heat utilization is the heat delivered to the cooking fluid/load. The two sensible heat storage vegetable oils are sunflower oil, and Roki oil (a blend of palm oil and sunflower oil). The heat utilization characteristics of the two heat storage materials are experimentally determined in water heating experiments using 1.0, 1.5, 2.0, and 2.5 kg water loads. The stored heat in Roki oil and sunflower oil is used to heat up the water during cool down/heat utilization tests. The reason for the research is that new insights into the utilization of a locally available vegetable oil (Roki oil) in Uganda, as a sensible thermal energy storage material, is determined. Additionally, a new storage pot is designed, tested, and compared with Roki oil and sunflower oil as sensible thermal energy storage materials. The highlights of the work are that average heat utilization values are dependent on the water heating load. The average heat utilization efficiency increases with the increase in the water heating load; Roki oil shows higher heat utilization and higher average heat utilization efficiency values as compared to sunflower oil; the average heat utilization and average heat utilization efficiency values increase with the increase in the water load for both Sunflower oil and Roki oil. The results suggest that Roki oil is a potential heat storage material for domestic applications since it shows better heat utilization characteristics than sunflower oil during heat utilization.

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Performance Assessment of a Box Type Solar Cooker Using Jatropha Oil as a Heat Storage Material

Cited by 3 publications

References 17 publications

Heat Storage for Cooking: A Discussion on Requirements and Concepts

Heat Storage for Cooking: A Discussion on Requirements and Concepts

Experimental Energetic and Exergetic Performance of a Combined Solar Cooking and Thermal Energy Storage System

Heat Utilization Characteristics of Two Sensible Heat Storage Vegetable Oils for Domestic Applications

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