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Multiple Phase Change Materials for Performance Enhancement of a solar dryer with Double Pass Collector

Energy Engineering 2021年第5期118卷 1483-1497页

作者： Ahmed J.Hamad Fawziea M.Hussien Johain J.Faraj Engineering Technical College Middle Technical UniversityBaghdadIraq

The fluctuation in drying temperature influences the food products’quality and drying time significantly during the drying process using an indirect solar *** of the effective methods to reduce these variations in the temperature is based on thermal storage materials to control the drying *** experimental investigation is presented in this study to evaluate the performance of an indirect solar dryer with air double pass using multiple phase change materials(PCM)as thermal storage *** PCMs with different melting points are used to store the available heat energy during peak sunshine periods and reduce the drying temperature *** tests on a food product sample are conducted in three cases,the first was without PCMs using natural *** second and third cases are based on forced convection with and without using multiple PCMs under Baghdad city *** results showed that;approximately a steady temperature of hot drying air was obtained during relatively low ambient temperatures when the dryer was incorporated with multiple *** drying time of the product sample for the natural,forced convection without PCMs and forced with PCMs was 87,72 and 47 h,*** higher performance of the dryer was for the forced convection with *** reduction percentage in drying time was about 17.2%and 46%for the forced convection without and with PCMs respectively compared with natural *** average drying rate for the natural,forced without PCMs and forced convection with PCMs was 0.0093,0.0135 and 0.0172 kg/h,*** enhancement in thermal efficiency of the solar collector and drying chamber with multiple PCMs was 43%and 25.5%,respectively,compared with a typical solar dryer.

关键词： solar dryer double pass indirect dryer multiple PCM drying rate

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Development of an inflatable solar dryer for improved postharvest handling of paddy rice in humid climates

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International Journal of Agricultural and Biological Engineering 2017年第3期10卷 269-282页

作者： Ana Salvatierra-Rojas Marcus Nagle Martin Gummert Tom de Bruin Joachim Müller Institute of Agricultural Engineering Tropics and Subtropics GroupUniversität HohenheimGarbenstrasse 9Stuttgart 70599Germany Postharvest Development Program International Rice Research Institute(IRRI)Los Baños 4031Philippines GrainPro Philippines Inc. Subic Bay 2222Philippines

Rice is the staple food for more than three billion people *** considerable progress has been made with respect to improved breeds and production practices,losses during postharvest handling remain *** and storage of paddy are two key stages where management can be *** rice,grain moisture content of 14%prevents microbiological activity,while a level of about 12%minimizes quality losses over prolonged storage *** to the need for simple and economical technologies,an inflatable solar dryer(ISD)was developed based on adaptations of the Hohenheim-type solar tunnel *** form a drying tunnel,transparent polyethylene(PE)film attaches by zipper to a reinforced black polyvinyl chloride(PVC)*** reduce heat loss,a flexible multilayer floor was used along the drying *** tunnel does not need a substructure as it is stabilized adequately from pressure created by two axial flow *** experiments,paddy was spread on the floor and mixed with a special roller *** ISD has been evaluated for paddy in the Philippines during both rainy and dry seasons and was subsequently *** drying and shade drying were carried out in parallel for comparison and product was evaluated for moisture content and quality in terms of milling recovery and head rice *** content was reduced from 23%to 14%within 26-52 h of continuous operation during the rainy season and 16%to 14%within 4-26 h of drying during the dry *** both seasons,the final moisture content of 12%was reached after prolonged drying *** was not found to be affected with respect to drying *** ISD showed advantages over sun drying,despite longer drying periods.

关键词： paddy rice postharvest handling solar dryer mobile dryer collapsible dryer Philippines

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Experimental Study of a Modified Icaro solar dryer: The Case of Coffee Drying

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Journal of Power and Energy Engineering 2023年第7期11卷 36-48页

作者： Auguste Oscar Mackpayen Aloys Martial Ekoe A. Akata Vinci De Dieu Bokoyo Barandja Kossi Napo Laboratoire d’Energétique Carnot (L.E.C) University of Bangui Bangui Central African Republic Laboratoire sur l’Energie Solaire (L.E.S) University of Lomé Lomé Togo Energy Systems Technology Laboratory (ESTL) University of Douala Douala Cameroon

Food losses in the developing country are thought to be 50% of the fruits and vegetables grown and 25% of harvested food grain. Food preservation can reduce wastage of a harvest surplus, allow storage for food shortages, and in some cases facilitate export to high-value markets. Drying is one of the oldest methods of food preservation. Drying makes produce lighter, smaller, and less likely to spoil and helps to minimize the moisture content in coffee beans as high moisture content during storage is certain to ruin the taste and appearance of coffee. This work presents the results of an experimental study of forced convection drying of coffee cherries in a modified Icaro solar dryer. The study aims to validate the numerical models developed for further research. The experimental tests envisaged also aim to determine the mass loss curves of the product by fixing or calculating its initial mass (1 kg), its initial water content (70%), the ambient temperature, the drying airflow (0.02 m3.s-1 to 0.09 m3.s-1) and the exchange coefficients. The influence of these aerothermal parameters on the drying time of a most commercialized coffee variety (Robusta) was studied. Finally, the results revealed an increase in the efficiency of the heat transfer air and a reduction in the water content of the coffee cherry from 70% to 9.87%, after 30.2 hours.

关键词： solar dryer Icaro Experimental Validation Moisture Content Coffee Tem-perature

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Experimentation of a Forced Convection solar dryer for Drying Sweet Potatoes at the Higher Institute of Technology of Mamou-Guinea

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World Journal of Engineering and Technology 2023年第3期11卷 536-548页

作者： Ansoumane Sakouvogui Thierno Amadou Barry Adama Moussa Sakho Mamby Keita Energy Department Higher Institute of Technology of Mamou Mamou Guinea Department of Chemistry Laboratory Techniques Higher Institute of Technology of Mamou Mamou Guinea Department of Physics Faculty of Sciences Gamal Abdel Nasser University Conakry Guinea

This study was carried out at the Mamou Higher Institute of Technology during the period from March 10 to April 15, 2022, with the aim of designing and testing a solar dryer with forced convection by drying potatoes. The dryer was designed using local materials. Its main geometric parameters are: 1) height of the drying chamber (90 cm), 2) length of the drying chamber (50 cm), 3) width of the drying chamber (43 cm), 4) surface of the racks (0.1806 m2), 5) surface of the heat accumulator (0.2537 m2). The experiment focused on the vacuum test of the dryer for two days and that of the drying of the sweet potato for three days from 8:30 a.m. to 5:30 p.m. The average vacuum test temperature values of the three environments are respectively accumulator (43°C), dryer chamber (41°C) and ambient environment (34°C). Four kilograms (4 kg) of boiled sweet potato were dried. The average temperatures in the accumulator and in the drying chamber during the three days of drying are respectively 33°C and 39°C. The final mass of the dried product is 1.2 kg, with a quantity of water extracted of 2 liters or 63% of the initial mass of the product. The average drying rate is 0.074 kg/h. The drying kinetics showed a decreasing rate in the absence of the heating period and the constant rate period.

关键词： Experimentation Temperature Accumulator Forced Convection solar dryer Sweet Potato

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Effect of Drying Air Velocity on Drying Kinetics of Tomato Slices in a Forced-Convective solar Tunnel dryer

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Journal of Sustainable Bioenergy Systems 2019年第2期9卷 64-78页

作者： Mamouda Moussa Na Abou Saidou Madougou Makinta Boukar Energy-Environment-Development Niger(ENDA Energy Niger) NiameyNiger Laboratoire d’Energetique d’Electroniqued’Electrotechniqued’Automatique et d’Informatique Industrielle(LEEII)Universite Abdou MoumouniNiameyNiger

The objective of this work is to analyse the extent to which a change in the drying air velocity may affect the drying kinetics of tomato in a forced-convective solar tunnel dryer. 2 m?s?1 (V1) and 3 m?s?1 (V2) air speeds were applied in similar drying air temperature and humidity conditions. Main drying constants calculated included the drying rate, the drying time and the effective water diffusivity based on the derivative form of the Fick’s second law of diffusion. Henderson and Pabis Model and Page Model were used to describe the drying kinetics of tomato. We found that solar drying of tomato occurred in both constant and falling-rate phases. The Page Model appeared to give a better description of tomato drying in a forced-convective solar tunnel dryer. At t = 800 min, the drying rate was approximately 0.0023 kg of water/kg dry matter when drying air velocity was at 2 m/s. At the same moment, the drying rate was higher than 0.0032 kg of water/kg dry matter when the drying air velocity was 3 m/s. As per the effective water diffusivity, its values changed from 2.918E?09 m2?s?1 to 3.921E?09 m2?s?1 when drying air velocity was at 2 and 3 m?s?1 respectively, which is equivalent to a 25% increase. The experimentations were conducted in Niamey, on the 1st and 5th of January 2019 for V2 and V1 respectively. For both two experiments, the starting time was 9:30 local time.

关键词： solar dryer Tomato Air Velocity Modeling Diffusivity

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Energy Intensity Diagnostics Contributed to solar dryers Energy Challenges

Energy Intensity Diagnostics Contributed to Solar Dryers Ene...

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作者： Fateme Esmailie Mohammad Aminy Hossein Ghadamian Renewable Energy Department Materials and Energy Research Center IACSIT

The energy consumption of dryers as an energy-intensive industry system is discussed in the present paper. In order to reduce this energy amount,solar dryers were applied since ancient times,among these kinds of dryers,high drying rate solar dryers include fluidized bed and spouted bed were discussed in this research study. The experiment and calculation results depicted that,the fluidized bed solar dryer has higher drying rate than spouted bed dryer,even though,spouted bed dryer has less energy intensity consumption.

关键词： Energy efficiency fluidized bed solar dryer spouted bed

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Effect of drying technologies on the biochemical properties of Stolephorus commersonnii

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Food Quality and Safety 2018年第3期2卷 153-158页

作者： Jamila Patterson Saritha Kailasam Hermina Giftson Jeyasanta K.Immaculate Suganthi Devadason Marine Research Institute TuticorinTamil NaduIndia

Objectives:Two different methods,namely traditional sundrying and solar dryer drying were employed to investigate the effect of drying method on the quality of Indian anchovies,Stolephorus *** and Methods:Fifty fish samples of Stolephorus commersonnii were purchased for the drying *** dried fishes were bought from the local *** solar drying the samples were kept in on the solar cabinet dryer KSD 25 designed and fabricated by the Central Institute of Fisheries Technology(CIFT).International standard AOAC methods were used for quality analysis of dried fish ***:The method of drying by the solar dryer is more hygienic and faster than the traditional sun-drying *** biochemical compositions and sensory evaluation of the products obtained showed significant variation between the two drying *** dryer-dried fish has got good organoleptic score than the traditional sundried *** overall quality of fish dried in the solar dryer was better than the traditionally sundried ***:The study clearly indicates that solar drying can be used as an environment-friendly method for fish processing which enhances food security.

关键词： Stolephorus commersonnii dried fish solar dryer biochemical qualities storage

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