Performance comparison of two solar cooking storage pots combined with wonderbag slow cookers for off-sunshine cooking

Mawire, Ashmore; Lentswe, Katlego; Owusu, Prince; Shobo, Adedamola; Darkwa, Jo; Calautit, John Kaiser; Worall, Mark

doi:10.1016/j.solener.2020.08.053

Cited by 47 publications

(36 citation statements)

References 61 publications

(76 reference statements)

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“…Mawire et al 135 assessed the performance of a solar cooker pot employing erythritol as a TES material and compared it to that of sunflower oil as a sensible storage material. Two parabolic dish solar cookers were constructed and tested with varying loads on each of those two storage materials during the sun cooking period.…”

Section: Application Of Medium and High‐melting Temperature Pcmsmentioning

confidence: 99%

The microencapsulation, thermal enhancement, and applications of medium and high‐melting temperature phase change materials: A review

Sinaga

Darkwa

Omer

et al. 2022

Intl J of Energy Research

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Summary Microencapsulated phase change materials (MEPCMs) have made tremendous advancements in recent years, owing to their increased demand for a variety of energy storage applications. In this paper, current microencapsulation techniques, enhancement, and use of medium‐ and high‐melting phase change materials (PCMs) are reviewed, as well as their potential benefits and limitations. The most frequently employed PCMs for medium‐ and high‐temperature applications were recognized as salt‐based, metallic, inorganic compound, and eutectic. Meanwhile, polymethyl methacrylate (PMMA), polystyrene‐butylacrylate (PSBA), polyethyl‐2‐cyanoacrylate (PECA), and polyurethane were widely used as polymer shell materials for encapsulating medium‐ and high‐melting point PCMs via chemical method, whereas inorganic silica shell was synthesized via various techniques. Hydrolysis followed by heat‐oxidation treatment has been extensively studied since 2015 to encapsulate either metal or alloy within Al2O3 shells. Different techniques were developed to generate void between core and shell material to accommodate volume expansion during phase transition. Numerous approaches, including the incorporation of metal particles, carbon, and ceramic, have been found as ways to enhance the thermal performance of PCMs. Multiple storage arrangements were also established to be an effective way of enhancing the overall efficiency of medium‐high melting PCM storage systems. Finally, the paper highlights the potential of medium‐ and high‐melting temperature PCMs for solar power generation, solar cooking, and industrial waste heat recovering applications.

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Section: Application Of Medium and High‐melting Temperature Pcmsmentioning

confidence: 99%

The microencapsulation, thermal enhancement, and applications of medium and high‐melting temperature phase change materials: A review

Sinaga

Darkwa

Omer

et al. 2022

Intl J of Energy Research

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“…Roasting experiments were carried to investigate parameters such as feeding capacity, conveyor speed, and thermal oil flow rate for achieving a light, medium, and dark quality roasting of groundnuts. The results showed that the recommended time to roast light, medium and dark groundnuts was 14, 20, 29 min, respectively, at an average temperature of 180 C. Figure 6 shows a photograph with cooked food and a schematic diagram of a storage cooking pot that was made of stainless steel presented by Mawire et al [84]. The storage cooking pot had an internal cavity in which the storage material was placed.…”

Section: Parabolic Dish Cookers With Shtesmentioning

confidence: 99%

A review of parabolic solar cookers with thermal energy storage

Lentswe¹,

Mawire²,

Owusu³

et al. 2021

Heliyon

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Biomass and fossil fuels are mostly used in rural areas of developing countries for cooking. These energy resources have negative impacts on the environment and human health mainly due to deforestation and greenhouse gas emissions. A cleaner and environmentally-friendly form of cooking is solar cooking using the sun's energy. Parabolic solar cookers perform better than other solar cookers such as box solar cookers since higher temperatures are achieved in a shorter duration. These higher temperatures allow most types of cooking processes such as; boiling, frying, roasting, and baking to be possible. The major problem with most conventional solar cookers is that cooking is not possible during off-sunshine periods. Integrating solar cookers with thermal energy storage (TES) makes cooking during off-sunshine periods possible. This paper presents a comprehensive review of parabolic solar cookers with TES which is a sustainable cooking solution for developing countries. Previous work on both parabolic trough and parabolic dish solar cookers with TES is presented. Solar cookers with storage are classified according to the two main types of TES technologies which are; sensible heat thermal energy storage (SHTES) and latent heat thermal energy storage (LHTES). The main conclusions of the review are that; parabolic dish solar cookers with TES are more common than parabolic trough cookers, more studies have been done using latent heat storage as compared to sensible heat storage, limited modelling work has been presented, most of the parabolic cookers used aluminum sheets as the reflecting material, large scale experimental studies are limited and fewer studies tackled the techno-economic and socio-economic aspects. The review also highlights research gaps on parabolic solar cookers with TES in terms of the modelling, combined TES (sensible and latent heat), different reflector materials, large-scale experimental setups, and techno-economic and socio-economic analyses. Other important aspects to consider for parabolic solar cookers with TES include; the choice of sensible or latent heat storage materials, environmental impact, types of food to be cooked, and social acceptance.

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“…A change in the internal arrangement of the solar cooker was discussed by Sagade et al [40]. The authors proposed a transparent modification of the top cover of the interior space intended for food preparation, which increased the heat flow directly into the prepared food and thus the total preparation temperature at the level of 120 • C-130 • C. Mawire et al [41], in their work, compared two devices designed for cooking using solar radiation. Both devices used heat accumulation usable at a time of lower solar radiation intensity.…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis of Concentrated Solar Heaters for Segmented Heat Accumulators

et al. 2021

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This presented paper focuses on the design and evaluation of the concept of concentrated solar heaters for segmental heat accumulators, which are designed to cover the energy needs of selected communities in terms of food preparation without the need for fossil fuels, which have a negative impact not only on the climate but especially on health. The proposed device is based on the traditional method of food preparation in the so-called earth oven; however, the fire-heated stones are replaced with heat accumulators heated by solar radiation. This approach eliminates the need to change common and long-term habits of food preparation for selected communities. The device connects solar vacuum heat pipes, a solar radiation concentrator, and heat accumulators. The concept was evaluated based on computational fluid dynamics (CFD) analysis with the use of a transient simulation of selected operating situations in three geographical locations. The results showed a significant temperature increase of the heat accumulators, where in the most effective case the temperature increased up to 227.23 °C. The concept was also evaluated based on a calorimetric analysis of the system consisting of heat accumulators and food. The resulting temperature in the considered case reached the pasteurization temperature necessary for safe and healthy food preparation.

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Performance comparison of two solar cooking storage pots combined with wonderbag slow cookers for off-sunshine cooking

Cited by 47 publications

References 61 publications

The microencapsulation, thermal enhancement, and applications of medium and high‐melting temperature phase change materials: A review

The microencapsulation, thermal enhancement, and applications of medium and high‐melting temperature phase change materials: A review

A review of parabolic solar cookers with thermal energy storage

Numerical Analysis of Concentrated Solar Heaters for Segmented Heat Accumulators

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