Grape drying by using hybrid photovoltaic-thermal (PV/T) greenhouse dryer: An experimental study |
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| Authors: | P Barnwal GN Tiwari |
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| Affiliation: | 1. Department of Mechanical Engineering, Coimbatore Institute of Engineering and Technology, Coimbatore, 641 109, India;2. Department of Mechanical Engineering, Delhi Technological University, Delhi, 110042, India;1. Centre for Energy Studies, Indian Institute of Technology Delhi, Hauzkhas, New Delhi 110016, India;2. Bag Energy Research Society (BERS), Sodha Bers Complex, Plot No. 51, Mahamana Nager, Karaudi, Varanasi, UP, India;1. AIARS (M&D), Amity University, Sector-125, Noida, UP, 201303, India;2. Centre for Energy Studies, Indian Institute of Technology Delhi, Hauzkhas, New Delhi 110016, India;3. Bag Energy Research Society (BERS) SODHA BERS COMPLEX, Plot No. 51, Mahamana Nager, Karaudi, Varanasi, UP, India;1. Centre for Energy Studies, Indian Institute of Technology Delhi, Hauzkhas, New Delhi 110016, India;2. Bag Energy Research Society (BERS) SODHA BERS COMPLEX, Plot No. 51, Mahamana Nager, Karaudi, Varanasi, UP, India;1. Department of Mechanical Engineering, Lakshmi Narain College of Technology, Bhopal, India;2. Department of Mechanical Engineering, Faculty of Engineering, Prince of Songkla University, Hat Yai, Songkhla 90112, Thailand;3. Department of Energy (Energy Centre), Maulana Azad National Institute of Technology, Bhopal 462 003, India |
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| Abstract: | A hybrid photovoltaic-thermal (PV/T) greenhouse dryer of 100 kg capacity has been designed and constructed at Solar Energy Park, Indian Institute of Technology, New Delhi (28°35′N, 77°12′E, 216 m above MSL), India. The developed dryer has been used to dry the Thompson seedless grapes (Mutant: Sonaka) when DC fan was in operation for forced mode convection. The drying of grapes was also performed in open as well as shade for comparison. Experiments were conducted for drying of grapes in the month of April, 2007. Various hourly experimental data namely moisture evaporated, grape surface temperatures, ambient air temperature and humidity, greenhouse air temperature and humidity, etc. were recorded to evaluate heat and mass transfer for the proposed system. It has been found that the value of the convective heat transfer coefficient for grapes (GR-I) lies between 0.26 and 0.31 W/m2 K for greenhouse and 0.34–0.40 W/m2 K for open conditions, respectively and that for grapes (GR-II) lies between 0.45–1.21 W/m2 K for greenhouse and 0.46–0.97 W/m2 K for open conditions, respectively. |
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