Design, modelling, energy and exergy analysis of a parabolic cooker

Onokwai, Anthony O.; Okonkwo, Ugochukwu C.; Osueke, C.O.; Okafor, Christian Emeka; Olayanju, Adeniyi; Dahunsi, S. O.

doi:10.1016/j.renene.2019.04.028

Cited by 42 publications

(15 citation statements)

References 16 publications

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“…[27] Receiver coating material Silicon based system preferable [28] Parabolic dish solar cooker with aluminium black coated receiver Efficiency of 7% was realized [29] Insulated wooden box receiver with glass cover and black painted pot placed inside Efficiency of 39% was registered [30] Material for cooking vessel (aluminium and galvanized iron) for parabolic solar dish Aluminium achieved higher temperature and Less cooking time [31] Comparison of two modes of the system (cooker and water heater)…”

Section: Referencesmentioning

confidence: 99%

Performance analysis of parabolic dish solar cooking system with improved receiver designs

Theu

Kimambo

2023

Renew. Energy Environ. Sustain.

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Lack of access to clean energy for cooking and heating applications is one of the challenges faced by households in developing countries. Solar cooking is one of the solutions, but suffers low adoption and utilization due to various challenges including technical limitation. This study investigated initiatives on improving the technical viability of parabolic dish solar system used for direct cooking by focusing on the receiver. Three receiver prototypes namely; Insulated, Oil-filled and Air-filled, all incorporated with a base circular ring, were constructed and their performance was compared experimentally with the conventional receiver. The maximum temperature inside cooking vessels were 154 °C, 99 °C, 141 °C and 128 °C while standardized stagnation temperature and first figure of merit (F1) were found to be 159 °C, 100 °C, 154 °C and 109 °C; and 0.26, 0.15, 0.54 and 0.17, for systems with insulated receiver, oil-filled receiver, air-filled receiver, and conventional receiver, respectively. The second figure of merit (F2), overall heat loss factor, heat exchange factor and optical efficiency were determined as 0.36, 0.15, 0.14 and 0.33; 59.7 W/m2 K, 28.6 W/m2 K, 20.49 W/m2 K and 73.4 W/m2 K; 0.18, 0.75, 0.69 and 0.23; 25%, 4%, 4% and 17%. The study found that the cooking system with Insulated Receiver gave more merits and was established as the best.

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Section: Referencesmentioning

confidence: 99%

Performance analysis of parabolic dish solar cooking system with improved receiver designs

Theu

Kimambo

2023

Renew. Energy Environ. Sustain.

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“…Moreover, the study revealed that there was a scope for further improvement in the heat loss coefficient of the system by using better insulation, shape and structure of the receiver. Onokwai et al (2019) designed and fabricated a solar box-parabolic dish cooker by using locally available materials in Nigeria on which modelling, and analysis of exergy and energy efficiencies were done. The receiver, which was not an integral part of the dish, was made of an insulated wooden box with a glass cover and a cooking pot, painted black placed inside.…”

Section: Previous Studies On Technical Performance Of Solar Cooking S...mentioning

confidence: 99%

Improved Receiver Design Concepts for Parabolic Dish Direct Solar Cooking Systems

Theu¹,

Kimambo²

2022

mejs

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In developing countries, solar cooking technology is considered one of the key measures in dealing with deforestation and environmental pollution. However, their adoption and utilization have been insignificant due to social, cultural, and technical challenges, among others. For parabolic dish direct solar cookers, one of the critical and most important components of the system is a receiver since its performance greatly affects the entire system. This paper presents part of the findings of the study which investigated the prospects of improving the technical performance of parabolic dish direct solar cooking systems by focusing on the identification of prospective heat loss reduction mechanisms on the receiver. The study identified the Insulated (IR), Air-filled (AFR), and Oil-filled (OFR) receivers with Base Circular Rings (BCR) as alternatives to the Conventional Receiver (CR) System. Tests were conducted using procedures and protocols given by the American Society for Agricultural Engineers (ASAE). The test results showed that the average power developed by the systems was 185 W for the IRBCR system, 90 W for the OFRBCR system, 92 W for the AFRBCR system, and 118 W for the CR system. The standardized cooking power for a temperature difference of 50oC, PS (50), was 291 W for the IRBCR system, 11 W for the OFRBCR system, 272 W for the AFRBCR system, and 142 W for the CR system. The results further revealed that the overall efficiencies were 23% for the IRBCR system, 9% for the OFRBCR system, 12% for the AFRBCR system, and 18% for the CR system. The receiver efficiencies were found to be 27% for a system with IR, 11% for a system with OFR, 14% for a system with AFR, and 21% for a system with CR. The study concluded that the performance improved when the system with the IR was used while the magnitudes of the performance parameters of the AFR and OFR were lower than the CR system.

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“…Solar reflecting systems for research activities, e.g. plane mirrors, need high quality and good specular reflectance properties [19][20][21][22][23][24][25]. Plane mirror of 2 mm thickness was used putting into consideration the cross weight of the parabolic dish.…”

Section: Materials Selectionmentioning

confidence: 99%

Performance Evaluation of Locally Designed and Produced Parabolic Solar Cooker

Aliyu¹,

Nnodim²,

Adebayo³

et al. 2021

IJEES

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Despite being able to supply beyond energy required for global use, the sun is still being greatly under-utilized possibly due to the availability of alternative sources of energies which are finite, costly, and far more hazardous. The aim of this research work is to seek better ways of utilizing the luminous flux (luminous energy emitted per second) or power from solar radiation, which is renewable, pollution free and which is freely available to mankind to generate heat or power required for cooking and for related needs of a cooker. The solar cooker, which is a family size type was designed (with the design specification temperature of 180°C) which was constructed and tested between the periods of 9.00 am and 4.00 pm during sun shine days. The maximum temperature attained was 140°C. The parabolic solar cooker has four panel booster reflectors (with rectangular plane mirrors on each booster reflector) each of which is detachable and a mechanical device is provided to constantly tilt the reflectors in the azimuthally direction so as to track the sun. These reflectors reflect the sun rays which falls incident on it to a focal point which give solar energy of high intensity. A known size pot was positioned with aid of a potholder on the focal point. The use of the parabolic cooker will help tremendously in the conservation of fossil fuel energy. However, on the sunny and cloudless days, the cooker can work effectively for various cooking purposes at almost the same rate as the conventional stoves. The efficiency of the cooker was determined and recorded. Finally, the cooker could be more efficient if the entire reflector surfaces of the cooker can be able to radiate heat energy from all its surfaces to the focal point. The cooker could be used for cooking on sunny days and in areas where electricity availability is questionable in terms of supply.

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Design, modelling, energy and exergy analysis of a parabolic cooker

Cited by 42 publications

References 16 publications

Performance analysis of parabolic dish solar cooking system with improved receiver designs

Performance analysis of parabolic dish solar cooking system with improved receiver designs

Improved Receiver Design Concepts for Parabolic Dish Direct Solar Cooking Systems

Performance Evaluation of Locally Designed and Produced Parabolic Solar Cooker

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