Abstract
A solar box cooker (SBC) has been developed for the thermal performance evaluation by operating it on a low cost thermal storage. For this, a mixture of sand and granular carbon has been prepared and tested for an optimum ratio under a solar collector. After testing, the ratio of 4:6 (sand: carbon) has been observed to maintain a high temperature range with long term heat storage. This mixture has been used as thermal heat storage inside the SBC. The experimentation procedure has been conducted under climatic conditions of Moradabad, India. Results indicated that the first Figure of merit (F1) was 0.13 m2°C /W, second Figure of merit (F2) was 0.44 m2°C /W, thermal efficiency was estimated to be 37.1%, cooking power was estimated as 44.81% and overall heat loss coefficient was 3.01 W/m2°C. The system was found feasible for cooking during the off sunshine conditions.
Highlights
Cooking is a major activity for different households, all over the world
A box cooker was tested with a storage material and found better than a solar box cooker (SBC) without heat storage
Two different sensible heat storing material; sand & carbon were used to estimate F1 and F2 by performing on individual storage and a mixture of undefined ratio of both of them Technical grade paraffin and erythritol has chosen as phase change material (PCM) and the results indicate that the food can be cooked the day around concurrently with heat storage along the day
Summary
People use different fuels for this task such as; firewood, charcoal, kerosene, dung cakes, LPG, electricity etc. People from the different regions/countries are attracting towards the solar energy applications like solar water heater, solar cooker, solar lights etc [1]. Solar energy is a good option for them as an alternative source of energy for cooking and water heating. Solar cookers are less in cost, simple in design, easy to fabricate, low maintenance, easy convenience, safe cooking and free from pollution [2]. Solar cookers are for two types; solar dish cooker (SDC) and solar box cooker (SBC). Dish cooker is a concentrating type of solar cooker and required a continuous tracking mode for operation while box cooker is a non-concentrating cooker and don’t require any tracking mode for cooking
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