Development of model based sensors for the supervision of a solar dryer

Correa Hernando, Eva Cristina and Arranz Saiz, Francisco Javier and Diezma Iglesias, Belen and Juliá, Eduardo and Robla Villalba, José Ignacio and Ruiz García, Luis and García-Hierro, Javier and Barreiro Elorza, Pilar (2011). Development of model based sensors for the supervision of a solar dryer. "Computers and Electronics in Agriculture", v. 78 (n. 2); pp. 167-175. ISSN 0168-1699. https://doi.org/10.1016/j.compag.2011.07.004.

Description

Title: Development of model based sensors for the supervision of a solar dryer
Author/s:
  • Correa Hernando, Eva Cristina
  • Arranz Saiz, Francisco Javier
  • Diezma Iglesias, Belen
  • Juliá, Eduardo
  • Robla Villalba, José Ignacio
  • Ruiz García, Luis
  • García-Hierro, Javier
  • Barreiro Elorza, Pilar
Item Type: Article
Título de Revista/Publicación: Computers and Electronics in Agriculture
Date: September 2011
ISSN: 0168-1699
Volume: 78
Subjects:
Faculty: E.T.S.I. Agrónomos (UPM) [antigua denominación]
Department: Ingeniería Rural [hasta 2014]
UPM's Research Group: LPF-TAGRALIA
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

Solar dryers are increasingly used in developing countries as an alternative to drying in open air, however the inherent variability of the drying conditions during day and along year drive the need for achieving low cost sensors that would enable to characterize the drying process and to react accordingly. This paper provides three different and complementary approaches for model based sensors that make use of the psychrometric properties of the air inside the drying chamber and the temperature oscillations of the wood along day. The simplest smart sensor, Smart-1, using only two Sensirion sensors, allows to estimate the accumulated water extracted from wood along a complete drying cycle with a correlation coefficient of 0.97. Smart-2 is a model based sensor that relays on the diffusion kinetics by means of assesing temperature and relative humidity of the air inside the kiln. Smart-2 model allows to determine the diffusivity, being the average value of D for the drying cycle studied equal to 5.14 × 10−10 m2 s−1 and equal to 5.12 × 10−10 m2 s−1 for two experiments respectively. The multidistributed supervision of the dryer shows up the lack of uniformity in drying conditions supported by the wood planks located in the inner or center of the drying chamber where constant drying rate kinetics predominate. Finally, Smart-3 indicates a decreasing efficiency along the drying process from 0.9 to 0.2

More information

Item ID: 8845
DC Identifier: http://oa.upm.es/8845/
OAI Identifier: oai:oa.upm.es:8845
DOI: 10.1016/j.compag.2011.07.004
Deposited by: Memoria Investigacion
Deposited on: 12 Sep 2011 10:12
Last Modified: 20 Apr 2016 17:29
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