Evaluating the optimum load range for box-type solar cookers

Mahavar, Sunita; Rajawat, P.; Punia, R.C.; Sengar, Namrata; Dashora, P.

doi:10.1016/j.renene.2014.08.003

Cited by 40 publications

(10 citation statements)

References 19 publications

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“…Moreover, Akoy's results are much higher than common values observed in the literature. Indeed, Funk suggests that the nominal efficiencies of solar cookers in general are averagely around 20%, while Mahavar reports a higher efficiency range of about 20% to 40% for box‐type solar cooker types, tested under the Indian solar insolation at Jaipur. In accordance with Kimambo, in reflector‐type solar cookers, the low value of thermal efficiency η should be due to the fact that «the cooking pot is completely exposed to the cooling effects of the surrounding atmosphere».…”

Section: Resultsmentioning

confidence: 99%

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Design and performance evaluation of solar cookers for developing countries: The case of Mutoyi, Burundi

et al. 2017

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Summary Here, we propose an approach for supporting the design and performance evaluation phase of solar cooking technologies, to assess their eventual appropriateness for remote rural contexts, before proposing them for local field tests. The approach is based on (1) local context description and analysis, (2) design and construction of the solar cookers, and (3) thermodynamic performance evaluation. We used the approach to analyse 3 cookers for the area of Mutoyi, Burundi: a parabolic, a panel, and a box cooker. From phases 1 and 2, only panel and box cookers emerged as the technically viable solutions: They were sized, optimized, built, and tested. In phase 3, the thermodynamic evaluation indicated that the box cooker is inappropriate, since water does not reach high enough temperature. Instead, the panel cooker shows a Standardized Cooking Power of 46.85 W and a stagnation temperature higher than 75°C, which is able to bring the water to the boil when the environmental temperature is higher than 25°C. The thermal efficiency of the cooker resulted equal to 8.13%, while the mean integral temperature Tm remained around 60°C for all the lab test replicates, higher than the minimum internal temperature to cook legumes. The results of the procedure applied to the case study indicate that the panel cooker can be proposed for local field tests with local food and cooking practices, for assessing its final appropriateness on the field.

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Section: Resultsmentioning

confidence: 99%

“…A performance evaluation procedure based on the figures of merit has been used by Geddam et al and Kumar as well. Mahavar et al introduced the concept of optimum load range for box‐type solar cookers, which allows to evaluate the load values for which a cooker operates with the optimal thermal and cooking performance.…”

Section: Introductionmentioning

confidence: 99%

Design and performance evaluation of solar cookers for developing countries: The case of Mutoyi, Burundi

et al. 2017

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“…The time to heat a given volume of water to near the boiling point is a nonlinear function of cooking power due to evaporation (Jetter et al, 2012). Mahavar et al (2015) defined required times for heating or cooking in two steps. In Step 1, a load should attain 80 °C within two hours for food grains to be properly cooked (Mahavar et al, 2015).…”

Section: Water Heating Timementioning

confidence: 99%

“…Mahavar et al (2015) defined required times for heating or cooking in two steps. In Step 1, a load should attain 80 °C within two hours for food grains to be properly cooked (Mahavar et al, 2015). The Step 1 requirement was met by the parabolic-and panel-type cookers but not by the box-type cooker, as shown in Fig.…”

Section: Water Heating Timementioning

confidence: 99%

Evaluation of performance of household solar cookers

Ebersviller

Jetter

2020

Solar Energy

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Household solar cookers were evaluated according to ASAE (American Society of Agricultural Engineers) Standard S580.1 -Testing and Reporting Solar Cooker Performance. Per ASAE S580.1, standardized cooking power at a temperature difference of 50°C between ambient air and cooking vessel water temperatures (± 95% confidence interval) was 198 (± 32) W for a parabolictype cooker, 65 (± 12) W for a box-type cooker, and 25 (± 9) W for a panel-type cooker. ASAE S580.1 specifies standardized cooking power as a single measure of performance, and additional measures of performance, including thermal efficiency and water heating times, were evaluated. The issue of water evaporation was examined. Clarifications for ASAE S580.1 wind velocity specification are recommended. ASAE S580.1 is specified as a normative reference in the ISO (International Organization for Standardization) 19867-1:2018 standard for laboratory testing of cookstoves, and a specified deviation for average wind velocity, ≤1.5 m/s, is based on recommendations from this study and concurrence from other ISO working group experts.

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“…1 There are so many box types of solar cookers available which work in day time only. Its evaluation is done by some researchers [36,37]. Some other researchers worked on solar cookers with storage systems.…”

Section: Type Of Solar Cookers With Storagementioning

confidence: 99%

Comparative study of heat storage and transfer system for solar cooking

Gawande

Ingole

2019

SN Appl. Sci.

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To run the Solar energy appliances, the continuous availability of solar energy is an essential. The Solar appliances are run by using solar energy either from PV cell or solar collector. Both of these devices require continuous solar rays. In order to use the solar energy after sunshine, it requires being stored first and then can be transferred to the appliances. One of the focused applications by using solar energy is the solar cooking. A Lot of research is going on the use of solar energy for cooking. But still, some extensive technique needs develop for easily usable systems. The various solar cookers are discussed to insist the need for development of solar storage systems for efficient cooking. This paper presents the comparative study of heat storage and transfer systems for solar cooking. The key aspects like, methodology to develop the heat storage system, requirements and properties of heat storage materials, need of insulations and their types are addressed. Some most usable materials are also analyzed. Keywords Heat storage system • PCM • Solar cooking List of symbols PCM Phase change material HTF Heat transfer fluid x Fraction melted Cp Specific heat (kJ/kg K) Csp Average specific heat between T1 and Tm (kJ/ kg K) Clp Average specific heat between Tm and T 2 (kJ/ kg K) dt Change in temperature in °C m Mass of heat storage medium (kg) Q Quantity of heat stored (kJ) T 2 Final temperature (°C) T 1 Initial temperature (°C) Tm Melting temperature (°C) hm Heat of fusion per unit mass (kJ/kg) VSI Vacuum super insulation VIM Vacuum insulation material VIP Vacuum insulation panel NIM Nano insulation material

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Evaluating the optimum load range for box-type solar cookers

Cited by 40 publications

References 19 publications

Design and performance evaluation of solar cookers for developing countries: The case of Mutoyi, Burundi

Design and performance evaluation of solar cookers for developing countries: The case of Mutoyi, Burundi

Evaluation of performance of household solar cookers

Comparative study of heat storage and transfer system for solar cooking

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