Please use this identifier to cite or link to this item: http://krishikosh.egranth.ac.in/handle/1/5810113707
Authors: NAYAK, SUDESANA
Advisor: Pal, Uma Sankar
Title: DEVELOPMENT AND TESTING OF A SOLAR POWER ASSISTED EVAPORATIVE COOL CHAMBER
Publisher: Orissa University of Agriculture and Technology, Bhubaneswar
Language: en
Type: Thesis
Pages: 70
Agrotags: null
Keywords: Evaporative cooling, vegetable storage, solar power, packaging material, thermoelectric cooling
Abstract: The present study was undertaken for development and testing of a solar power assisted evaporative cool chamber for storage of fruits and vegetables. An evaporative cool chamber of 100 kg storage capacity was developed. A solar system, consisting of 150 W solar panel, an inverter (100VA), a battery and a charge controller, was used to run a 18 W water pump and 20 W exhaust fan of the evaporative cool chamber. The solar assisted evaporative cool chamber was tested to optimise the water and air flow rate for achieving low temperature and high RH inside the chamber. Storage study was conducted for cucumber, bittergourd and okra in open, 1.34 % perforated PP and 2.54 % perforated HIPS punnet packs under ambient, evaporative cool and refrigerated conditions. Different quality parameters such as physiological loss in weight (PLW), titratable acidity, total soluble solids (TSS), firmness and colour of the stored vegetables were measured daily using standard procedure to determine the shelf life. A Peltier module was also attached at the outside wall of the bottom water reservoir and tested to achieve further lower chamber temperature. The chamber temperature decreased and relative humidity increased significantly with increase in water and air flow rate (p<0.05). Water flow rate of 3.58 l/min with air flow rate of 2.09 m3/s was considered to be optimum to obtain higher temperature drop with RH more than 90 % in the evaporative cool chamber under study. The average decrease in temperature and the increase in relative humidity as compared to the ambient was about 8 0C and 33%, respectively. There was significant difference in the PLW (%), firmness, colour value, total soluble solids and titratable acidity of all the vegetables stored in the evaporative cool chamber and ambient condition at 5 % level. Among the two packaging materials, perforated PP pouch was considered better for cucumber and bittergourd, whereas perforated HIPS Punnet was considered better for okra. The PLW for cucumber were 4.45, 3.02 and 1.30 % in control, punnet pack and PP pouches in evaporative cool chamber and 18.76, 8.94 and 4.13% under ambient storage conditions, respectively after 4 days of storage. The PLW of bittergourd in evaporative cool chamber was 6.91% in control, 3.89 % in punnet and 2.23 % in PP pouches while the percentage loss was significantly higher (ranging from 7 to 25.2 %) under ambient condition of storage. The PLW were found to be 8.94, 2.41 and 4.56 % in control, punnet and PP pouches, respectively after 4 days of storage in evaporative cool chamber and was nearly about 50% when in open condition under ambient storage. From the above study, it was concluded that cucumber and bittergourd could be stored in PP with 1.34 % perforation and okra in HIPS punnet with 2.54 % perforation in the developed solar power assisted evaporative cool chamber up to 4 days in marketable condition and the quality parameters were comparable with refrigerated storage samples. The developed solar power assisted evaporative cool chamber can operate for 24 h harnessing renewable solar energy which could serve as a promising technology for short term storage of fruits of vegetables in hot and dry climate.
Description: Th-5659
Subject: Agricultural Processing and Food Engineering
Theme: DEVELOPMENT AND TESTING OF A SOLAR POWER ASSISTED EVAPORATIVE COOL CHAMBER
These Type: M.Tech.
Issue Date: 2019
Appears in Collections:Thesis

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