Evaluating the optimum load range for box-type solar cookers |
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| Affiliation: | 1. Unité de Recherche Appliquée en Energies Renouvelables, URAER, Centre de Développement des Energies Renouvelables, CDER, 47133 Ghardaïa, Algérie;2. Laboratoire de Recherche LEB, Département d’Electrotechnique, Université Hadj Lakhdar, Boukhlouf Med ElHadi, Batna, Algeria;3. Centre de Développement des Energies Renouvelables, CDER, 16340 Algiers, Algeria;4. Department of Renewable Energy Engineering, Maharana Pratap University of Agriculture and Technology, Udaipur, Rajasthan 313001, India;1. Department of Mechanical Engineering, Faculty of Engineering, Sana''a University, P.O. Box 12544, Sana''a, Yemen;2. School of Mechanical Engineering, Faculty of Engineering, Universiti Teknologi Malaysia, 81310, Skudai, Johor, Malaysia;3. Department of Mechanical Engineering, Faculty of Engineering, Jordan University of Science & Technology, P.O. Box 3030, Irbid, 22110, Jordan;4. School of Mechanical Engineering, Engineering Campus, Universiti Sains Malaysia, 14300, Nibong Tebal, Penang, Malaysia;1. Renewable Energies Chair, University of Évora, IIFA, Largo Marquês de Marialva, 7002-554 Évora, Portugal;2. Portuguese Solar Energy Institute, IPES, Largo Marquês de Marialva, 7002-554 Évora, Portugal;1. Department of Mechanical Engineering, Punjab Agricultural University, Ludhiana 141004, India;2. Department of Mathematics, Statistics and Physics, Punjab Agricultural University, Ludhiana 141004, India;3. Department of Mechanical Engineering, North Dakota State University, Fargo, 58102 ND, USA;1. Department of Basic Science, Misr Higher Institute for Engineering and Technology, Mansoura, Egypt;2. Agricultural Engineering Department, Faculty of Agriculture, Zagazig University, 44511 Zagazig, Egypt;3. Department of Physics, Faculty of Science, Tanta University, Tanta, Egypt;4. Solar Energy Research Laboratory, Pandaharpur 413304, Maharashtra, India |
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| Abstract: | This paper introduces a new concept of Optimum Load Range (OLR) for solar cookers. OLR gives the load values for which cooker preferably shows good thermal as well as good cooking performance; it may be considered a crucial parameter for solar cookers. This OLR concept is based on the dependence of rate of rise of load temperature on different heat transfer processes between load and cooker interior. This concept illustrates solar cooking in two simple steps. The total time required to complete these steps puts an essential constraint for cooking of any load amount. The maximum value of load (upper limit of OLR) till which cooker shows satisfactory cooking may be determined from this constraint. This constraint requires determination of two OLR parameters which are tstep I and tstep II. The load for which cooker remain almost 30% efficient, may be referred as lower limit (minimum value) of OLR. For the verification of OLR, experimental studies have been conducted with a solar cooker named SFSC. The OLR parameters along with different thermal performance parameters (TPPs) (second figure of merit (F2), utilization efficiency (ηu) etc.) suggested by different researches for solar cookers in water load condition have been computed from the measured thermal profiles of different loads (0.8–3.0 kg). From the curve analysis of different TPPs with load, the existence of upper limit of OLR is observed. The values of rate of rise of load temperature at water temperatures 80, 85 and 90 °C for different loads also confirm the same. The OLR of SFSC is found to be 1.2–1.6 kg. |
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| Keywords: | Optimum load range (OLR) Figure of merit Utilizable efficiency Single family solar cooker |
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