Eventos Anais de eventos
ENCIT 2020
18th Brazilian Congress of Thermal Sciences and Engineering
Development of natural convection solar drying system
Submission Author:
RODRIGO Eduardo Predolin , SP
Co-Authors:
RODRIGO Eduardo Predolin, Vicente Luiz Scalon, Geraldo Luiz Palma
Presenter: RODRIGO Eduardo Predolin
doi://10.26678/ABCM.ENCIT2020.CIT20-0603
Abstract
Most foods deteriorate very easily, to minimize this problem, some food preservation techniques have emerged, among which, drying is one of the most used. The advantages of drying food are better preservation of the product, reduction of its weight, with the consequent reduction in the cost of transportation and storage. With drying, decreasing the amount of water, not only the weight decreased, but it also creates unfavorable conditions for the microbial growth of the product. An indirect solar dryer with natural convection was developed, constructed and experimentally investigated. It is formed for 3 main parts: absorber plate with 0.5 m2 area of surface, dryer chamber and exhaust duct, highlighting that the absorbed plate has the possibility of modify it’s position and direct the flow air that was initially over the upper face, to the upper and lower face (double passage). This change increased the moisture removal rate from 0.47 g/min to 0.56 g/min, the total moisture removal from 185 g to 220 g and the average daily thermal efficiency from 8.5 % to 19.8 %. The analysis of the equipment was possible due to the presence of temperature sensors, humidity and atmospheric pressure sensors positioned at air inlet and outlet, a turbine type anemometer at the air outlet, in addition, the absorber plate has 3 temperature sensors and the cell load is located in the drying chamber, allowing to record moisture removal, which can also be calculated by mass balance with the data provided by sensors at the entrance and exit of air in the dryer system.
Keywords
Indirect solar dryer, Solar absorber panel, Convective solar dryer
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