scholarly journals Preliminary study of drying of natural coffee by cyclical pressure changes

DYNA ◽  
2020 ◽  
Vol 87 (214) ◽  
pp. 53-60
Author(s):  
Alfonso Parra-Coronado ◽  
Oscar Leonardo García-Navarrete ◽  
Francy Alejandra Vanegas-Izquierdo ◽  
José Alfredo Gamboa-Gamboa ◽  
Andrés Felipe González-Mora ◽  
...  
Keyword(s):  
Low Temperature ◽  
Solar Drying ◽  
Drying Process ◽  
Cyclic Pressure ◽  
Preliminary Study ◽  
Drying System ◽  
The One ◽  
Pressure Changes ◽  
Cup Quality

A “special coffee” is obtained with an adequate drying process, which allows the preservation of volatile substances responsible for excellent cup quality. The aim was to carry out preliminary studies of drying of natural coffee by implementing a Cyclic Pressure Changes (CPCD) dryer, comparing it with solar drying and with a mechanical drying system by forced convection of low-temperature air. The drying times and rates of the systems used were compared, as well as the respective valuation of the cup quality. Drying times were 767 h for solar drying system, without reaching the desired moisture content; 153.5 h for mechanical drying system and 449 h for the CPCD system. However, the global cup tests showed a better quality of the grain obtained with the CPCD system (87 points), than the one obtained with the mechanical drying at 35°C (84 points).

scholarly journals РАЗРАБОТКА И ИСПЫТАНИЕ СОЛНЕЧНОЙ УСТАНОВКИ С ПОЛИКАРБОНАТНЫМ ПОКРЫТИЕМ ДЛЯ СУШКИ ПРОДУКТОВ СЕЛЬСКОГО ХОЗЯЙСТВА

World Science ◽  
2021 ◽  
Author(s):  
Ketevan Archvadze ◽  
Ilia Chachava ◽  
Ketevan Papava ◽  
Nanuli Khotenashvili ◽  
Riva Liparteliani ◽  
...  
Keyword(s):  
Vitamin C ◽  
Air Temperature ◽  
Laboratory Analysis ◽  
Agricultural Products ◽  
Solar Drying ◽  
Drying Process ◽  
Drying Time ◽  
Drying System ◽  
Natural Drying

The proposed solar drying system significantly reduces the drying time and improves the quality of the product, including the preservation of vitamins. When drying rosehip, a laboratory analysis for vitamin "C" showed that 28% of this vitamin is destroyed during natural drying, and 17% when using a solar dryer.The drying speed increases by 2.5 - 4 times compared to traditional outdoor drying.In the proposed installation, you can dry different agricultural products, you can change the coating of the solar drying unit. In S/D, the air temperature is higher than in the environment from about 13 to 32 degrees Celsius, depending on weather conditions.The drying process in the S/D apparatus allows you to ensure the purity of the products. S/D is covered and during the drying process the product is not contaminated with dust and rain, by influence of dew, is not damaged by birds, insects or wasps.This device is convenient for transportation, during the day it can be moved and rotated to align to the sun.The proposed solar dryer is easy to manufacture and can be widely used in large and small farms, private and subsidiary farms.

SUITABILITY OF LOW TEMPERATURE VACUUM PAN EVAPORATOR CONDENSATE FOR PLANT USES

1966 ◽  
Vol 29 (2) ◽  
pp. 40-44
Author(s):  
Daniel A. Stock
Keyword(s):  
Low Temperature ◽  
Skim Milk ◽  
Water Source ◽  
Additional Treatment ◽  
Pan Evaporation ◽  
Quality Of Water ◽  
Plant Uses ◽  
Preliminary Study ◽  
Exchange Medium

Summary A preliminary study to investigate the possibility of utilizing condensates and tailwater from the low temperature vacuum pan evaporation of skim milk for evaporating plant uses was made. The results indicated that the utilization of these condensates and tailwaters for various plant purposes is possible and should provide a readily available, safe and sanitary water source if adequate steps such as quality monitoring and treatment are taken to insure that the highest quality of water is retained and used. The use of tailwater as a heat exchange medium on a single pass basis should require only quality control monitoring. However, condensate or tailwater which is to be used for other purposes should be aerated and may need additional treatment to prevent the development of tastes, odors, growths, corrosion, and scale formation.

scholarly journals THE EFFECT OF CONVECTIVE FIXED BED DRYING BASED ON A SOLAR COLLECTOR AND PHOTOVOLTAIC (CSD) TO THE QUALITY ATRIBUTES OF RED PEPPER COMPARED WITH CONVENTIONAL CONVECTIVE FIXED BED DRYING (CCD)

2019 ◽  
Vol 7 (1) ◽  
pp. 24-33
Author(s):  
Siti Asmaniyah Mardiyani ◽  
Sumardi Hadi Sumarlan ◽  
Bambang Dwi Argo ◽  
Amin Setyo Leksono
Keyword(s):  
Ascorbic Acid ◽  
Solar Collector ◽  
Fixed Bed ◽  
Quality Attributes ◽  
Red Pepper ◽  
Convective Drying ◽  
Solar Drying ◽  
Rehydration Ratio ◽  
Drying System

The effect of conventional convective drying (CCD) and convective solar drying (CSD) based on a solar collector and photovoltaic on the quality of dried red pepper was researched. The study was aimed to determine the effect of five drying system (CCD 50°C, CCD 60°C, CCD 70°C, CSD, and open sun drying) on the quality attributes of dried red pepper. The quality observed were rehydration ratio, ascorbic acid, capsaicin, non-enzymatic browning index, anthocyanin, and carotenoids. The results of the study confirmed that the drying system significantly affected the quality attributes of dried red pepper except for anthocyanin.  The CSD had a satisfactory result, shown by some attributes  (carotenoids, ascorbic acid, and ratio) which were not statistically different from the quality of dried red pepper gained from CCD 50°C.

scholarly journals Effect of Drying Whole and Half Chili Pods Using a Solar Dryer with CaCl2 Desiccant on Quality of Powder Chili

2021 ◽  
Vol 2021 ◽  
pp. 1-8
Author(s):  
Nauas D. M. Romauli ◽  
Himsar Ambarita ◽  
Al Qadry ◽  
Hendrik V. Sihombing
Keyword(s):  
Vitamin C ◽  
Beta Carotene ◽  
Quality Parameters ◽  
Solar Drying ◽  
Drying Process ◽  
Drying Time ◽  
Powder Product ◽  
Chili Powder ◽  
Pepper Powder

This study investigated the quality of dried whole and half chili pods’ powder dried with solar drying combined with CaCl2 desiccant compared with natural convection solar drying to produce the final chili powder product. Besides the sensory analysis, the quality parameters such as beta-carotene, moisture, vitamin C, and ash content were also observed. The results showed that 57 hours of drying time of whole and half chili pods using solar drying can reach moisture content below 5%. Beta-carotene, ash, and vitamin C contents of the whole chili were higher than those of half chili pods’ dried pepper powder; they were 20.38 ± 0.22   mg / 100   g , 5.81 ± 0.15 % , and 23.99 ± 0.57   mg / 100   g , respectively. This study can guide the red chili drying process based on the quality of the dried chili powder.

scholarly journals Study of Four Onion Varieties Drying Kinetics in an Oven and a Solar Greenhouse

2019 ◽  
Vol 8 (3) ◽  
pp. 59
Author(s):  
Ngoné Fall Beye ◽  
Nicolas Cyrille Ayessou ◽  
Cheikhou Kane ◽  
Mariame Niang Mbaye ◽  
Cheikh Talla ◽  
...  
Keyword(s):  
Lower Cost ◽  
Physicochemical Characterization ◽  
Drying Kinetics ◽  
Solar Drying ◽  
Drying Process ◽  
Allium Cepa L ◽  
Solar Greenhouse ◽  
Drying Conditions

Onion production (Allium cepa L.) in Senegal reached 390 000 tons in 2016. Due to post-harvest losses, annual demand (150 000 and 250 000 tons) is being met through imports. This work consists in proposing a drying process at a lower cost to overcome this dependence and preserve the quality of the product. The optimization of local onion varieties drying in an oven and in solar greenhouse, as well as the physicochemical characterization of the products were carried out. The moisture of fresh onion bulb varies between 85.56 ± 0.60 and 89.13 ± 0.69 (%). To obtain a moisture £ 8.89 ± 0.16 (%) ensuring stability, the optimal drying conditions in the oven are 60° C / 6H (Galmi Violet) and 7H (Safari, Gandiol F1 and Orient F1). Under these conditions, the content of polyphenols in g equivalent of gallic acid / 100 g db increases (0.111 ± 0.0040 to 0.312 ± 0.0041 before drying, 0.546 g ± 0.0117 to 0.837 ± 0.0091 after drying). Optimum solar drying in a greenhouse is obtained between temperatures of 35 to 65° C / 8H-9H. From a perspective of sustainable development, the perspective is the modeling of drying kinetics in a solar greenhouse.

Effect of the solar drying process on the sensory and chemical quality of cocoa (Theobroma cacao L.) cultivated in Antioquia, Colombia

2019 ◽  
Vol 115 ◽  
pp. 259-267 ◽  
Author(s):  
Luis Danilo Porras Barrientos ◽  
Juan Diego Torres Oquendo ◽  
Maritza Andrea Gil Garzón ◽  
Olga Lucia Martínez Álvarez
Keyword(s):  
Theobroma Cacao ◽  
Chemical Quality ◽  
Solar Drying ◽  
Drying Process ◽  
Theobroma Cacao L

scholarly journals Intermittence periods in corn seed drying process

2018 ◽  
Vol 40 (2) ◽  
pp. 193-198 ◽  
Author(s):  
Rafael de Oliveira Vergara ◽  
André Fernandes Capilheira ◽  
Gizele Ingrid Gadotti ◽  
Francisco Amaral Villela
Keyword(s):  
Moisture Content ◽  
Average Moisture Content ◽  
Maturity Stage ◽  
Drying Process ◽  
High Moisture Content ◽  
High Moisture ◽  
Corn Seed ◽  
Physiological Quality ◽  
Drying System

Abstract: The high quality is a factor that must be assured in a corn seed production system. In order to achieve this, seeds are harvested with high moisture content, and then artificially dried. However, the costs of this operation are high and may reduce the profits. The objective of the present study was to evaluate, through the physiological quality, the possibility of using intermittence periods for drying corn seeds on the cob in a stationary system. The seeds were harvested on the cob, close to the physiological maturity stage, with an average moisture content of 35%. The treatments consisted of four periods of intermittence (3, 6 and 9 hours) and one period without intermittence. The seeds were stored for six months. To evaluate the physiological quality of the seeds, germination, first germination, electrical conductivity, and the cold tests were performed. The experimental design was completely randomized, in split plots. In a stationary drying system, periods of intermittence of up to 6 hours per day helped to preserve the physiological quality of the corn seeds. The use of intermittence periods in the drying process provides corn seeds with higher physiological quality and greater storage potential, in comparison with the continuous drying.

The Food Value, Quality and Grading of Meat with Special Reference to Beef

1945 ◽  
Vol 1945 (01) ◽  
pp. 41-56
Author(s):  
E. H. Callow
Keyword(s):  
Low Temperature ◽  
The Other ◽  
Research Station ◽  
Secondary Effects ◽  
Beef Industry ◽  
New Approach ◽  
University Of Cambridge ◽  
The One ◽  
Food Value

During the war an investigation has been carried out at the Low Temperature Research Station, Cambridge, on the food value of beef. The beef animals were specially selected by Dr. J. Hammond, F.R.S. (School of Agriculture, University of Cambridge), and by the Meat and Livestock Division of the Ministry of Food, as being representative of the beef industry as a whole. The work on steers and heifers has already been published (Callow 1944), and that on cows will follow shortly. When the data from these investigations came to be analysed, it was found that sex, age and breed have only secondary effects on the food value of beef. The important factor is the stage of growth of the animal. In the present paper it is proposed to use this new approach to the old problem of the relation between grading on the one hand, and the food value and quality of beef on the other.

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