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Method of research for solar cookers performance characteristics- analysis and comparison

Raghav Geetanjali, Sharma Pankaj Kumar, Kumar Suresh, Maithani Rajesh

Acta Innovations

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2021

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no. 39

54--66

EN

Cooking is one of the most common activity in day-to-day life of every woman. In rural areas the transportation of fuel is major problem and the increasing demand of energy for cooking applications is gaining importance and various investigations are being carried out for performance enhancement of the solar cooker. The box-type solar cooker has a complex thermal analysis due to the transient heat transfer phenomenon involved in three dimensions. A comparison of the standard correlation available are analysed for accuracy of predicted results with experimental data. The investigation involves the experimental determination of the parameters viz. wind heat transfer coefficient, side and bottom loss coefficient, inner and outer glass temperature. The extensive data is analysed with that of standard correlations and the significance of the experimental data is checked. Analysis found to have deviation of 3%-20% in experimental and correlation data, which indicates that for accuracy of performance analysis the studied parameters should be determined experimentally.

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Analysis of solar cooker with thermal storage for remote hilly areas: determination of heating and cooling characteristic time

Raghav Geetanjali, Sharma Pankaj Kumar, Kumar Suresh, Maithani Rajesh, Iung Alexis, Mercier Quentin

Acta Innovations

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2021

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no. 40

5--18

EN

Solar cooking finds a major application in rural areas of Uttarakhand, India, yet its utilization is still limited due to certain limitation such as intermittent nature of solar radiations. This drawback limits solar cooker in becoming a viable alternate solution of LPG and other pollution causing resources such as wood. In order to cater this problem a numerical analysis of box type solar cooker with storage is carried out. The energy stored in the storage material will keep the cooker warm up to the time when food is consumed. Charging and discharging time analysis is performed in with an aim to understand the effect of storage on solar cooker. Heating and cooling characteristic time are being evaluated and analysed with storage. Thermal performance of box type solar cooker is measured in terms of figures of merit according to BIS standards. The effect of storage has also been analysed in terms of charging and discharging time and first figure of merit of box type solar cooker.it has been observed that during discharging the heat is stored for more duration as compared to the charging time as discharge time is approx. 4-5 hours while charging time for the same amount of insolation is around 3-4 hours.

3

Suszenie słońcem - przegląd stosowanych technologii

Grabowska B., Kasperski J.

Ciepłownictwo, Ogrzewnictwo, Wentylacja

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2016

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T. 47, nr 7

284--289

PL

Energia promieniowania słonecznego od dawna była wykorzystywana do rozniecania ognia, oświetlenia, ogrzewania pomieszczeń, utrwalania produktów żywnościowych itp. Współcześnie energię słoneczną wykorzystuje się do podgrzewania wody, w procesach produkcyjnych (tj. fermentacji sera, przygotowania pasz, podgrzewania wody technologicznej w małych zakładach przetwórstwa rolno-spożywczego, do suszenia roślin, ziarna, drewna i materiałów budowlanych), do podgrzewania powietrza (do regulacji mikroklimatu w przechowalniach płodów rolnych, ogrzewania pomieszczeń inwentarskich, hal, magazynów, szklarni, tuneli foliowych i budynków mieszkalnych). Suszenie należy do najstarszych metod konserwacji owoców, warzyw, mięsa i ryb. Również i dziś na całym świecie żywność suszy się, poddając ją działaniu słońca. W artykule zaprezentowano przegląd metod wykorzystania słonecznych instalacji powietrznych w technologii utrwalania bądź zagospodarowania różnych grup produktów (suszarnie płodów rolnych, kuchenki słoneczne, suszarnie osadów ściekowych, suszarnie biomasy, suszenie drewna). Opisano właściwości materiału poddawanego obróbce cieplnej oraz procesy wymiany ciepła i masy.

EN

Solar energy has long been used to kindle fire, lighting, heating, food preservation etc. Today, solar energy is used to heating water in production processes (i.e., fermented cheese, preparation of feed, water heating technology in small-scale food processing, food drying plants, grain, wood and construction materials), to heat the air (to regulate microclimate for storage of agricultural products, heating livestock sheds, halls, magazines, greenhouses, plastic tunnels and residential buildings). Drying is one of the oldest methods of preservation of fruits, vegetables, meat and fish. Even today, worldwide processes of drying food apply sun energy. Overview of the methods of using solar air systems in preservation technology or management of the different product groups (drying of agricultural products, solar cookers, drying of sewage sludge, drying of biomass, drying woods) was described. The properties of the material to be heat treated and the processes of heat and mass was described.