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Showing 3 results for Solar Cooker
Hossaen Khorasanizade, Majid Spooshan, Saeed Nazari,
Volume 13, Issue 13 (3-2014)
Abstract
In this study design, construction and test of a solar bread cooker has been undertaken for solar radiation status in Kashan. In design step and in order to produce the required energy, use of a parabolic reflective surface for concentrating the solar flux on the back of a cooking plate was considered. For cooking thin bread with 45 cm diameter the diameter of the reflective surface was calculated 130 cm and the cooking plate diameter and thickness were considered 48 cm and 6 mm, respectively. Since the sun orientation changes with time the reflective surface became capable of being adjusted around a north-south as well as east-west axes; also it may be moved vertically up or down. For evaluating the performance, tests and measurements were performed on different days of summer, 1391. The results indicated the validity of calculations and showed the overall efficiency of the solar bread cooker is around 50%. With the solar cooker it is possible to cook 12 beards per hour each with 200 gr weight of dough in eight months of the year at least for six hours in every sunny day; also it may be used for cooking other foods.
M. Hosseinzadeh, S.m. Mirzababaee , H. Zamani, A. Faezian, F. Zarrinkalam,
Volume 19, Issue 7 (7-2019)
Abstract
In this study, the performance of an evacuated tube solar cooker analytically investigated. For this purpose, the heat transfer mechanisms in different components of the solar cooker is evaluated. The main aim of this article is to investigate the important parameters of the evacuated tube solar cooker in different weather conditions using the validated analytical model. The studied parameters are: wind speed, ambient temperature, and input solar radiation. The experiments performed at the Research Institute of Food Science and Technology, Mashhad, Iran (Latitude: 36° and Longitude: 59°).
The results reveal that the presented analytical model is an accurate model that can be used in the paramedic analysis of the evacuated tube solar cooker. Moreover, in the
reference weather conditions, the lost heat contains
only 12.22 W of the absorbed solar radiation (137.51 W).
Therefore, about 8.89% of the absorbed solar radiation is lost. Based on the results, the temperature of outer surface of the cooker is only 3.64
°C higher than the ambient temperature due to the vacuum between the tubes. In addition,
the evacuated tube solar cooker has proper performance in various weather conditions. Increasing the ambient temperature from 5 °C to 35 °C enhances the solar cooker efficiency by 0.65%.
M. Hosseinzadeh, H. Zamani, S.m. Mirzababaee, A. Faezian, F. Zarrinkalam,
Volume 20, Issue 6 (6-2020)
Abstract
In this study, a portable parabolic solar cooker is designed and fabricated, and the daily performance of the solar cooker is investigated from the energy and exergy viewpoints. One of the important challenges of the parabolic solar cookers is the reduction of their performance in the windy conditions. In order to evaluate this issue, the effect of 0.2, 2, 4 and 6m/s wind speeds on the energy and exergy efficiencies of the solar cooker is studied. Based on the results, the energy efficiency of the parabolic solar cooker is 34.52-46.19% and the exergy efficiency is 2.11-5.60% during the experiment. The experimental results indicate that water can boil in the windy conditions using the fabricated solar cooker although the time required to boil water increases by rising the wind speed. According to the results, in the wind speed of 6m/s, the time taken to boil 2 liters of water is about 40min. Furthermore, the energy and exergy efficiencies of the parabolic solar cooker in the wind speed of 6m/s are 20.08% and 1.99%, respectively, lower than those in the wind speed of 0.2m/s.
