Design, construction and performance testing of a solar dryer for agroindustrial by-products

Spain generates a big amount of agroindustrial by-products of high moisture that produce a high environmental impact. This fact motivates the aim of this paper, in which a solar dryer prototype is designed, constructed, and performance tested for the analysis of the drying kinetics of these by-products and their possible power valuation. The characteristics of the prototype are presented, together with the variations of the properties of temperature, relative humidity, air mass flow, and efficiency for indirect, mixed, passive, active, and hybrid operation modes. The most efficient operation mode will be the forced-hybrid one, followed by the passive and active modes. The analysis of the drying kinetics of the olive pomace shows the better performance of the hybrid and mixed modes, obtaining reductions of the drying time of a 50% in both cases.

[1]  S. O. Enibe,et al.  Performance of a natural circulation solar air heating system with phase change material energy storage , 2002 .

[2]  Darko Velić,et al.  Influence of airflow velocity on kinetics of convection apple drying , 2004 .

[3]  V. K. Vijay,et al.  Study on performance evaluation of hybrid drier for turmeric (Curcuma longa L.) drying at village scale , 2006 .

[4]  W. A. Amos,et al.  Report on Biomass Drying Technology , 1999 .

[5]  S. Rojas,et al.  Thin-layer drying behaviour of sludge of olive oil extraction , 2007 .

[6]  İbrahim Doymaz,et al.  Modelling of olive cake thin-layer drying process , 2005 .

[7]  Dilip Jain,et al.  Modeling the system performance of multi-tray crop drying using an inclined multi-pass solar air heater with in-built thermal storage , 2005 .

[8]  Azharul Karim,et al.  Performance evaluation of a v-groove solar air collector for drying applications , 2006 .

[9]  S. Chirarattananon,et al.  A steady-state model for the forced convection solar cabinet dryer , 1988 .

[10]  F. Zagrouba,et al.  Drying of agricultural crops by solar energy , 2004 .

[11]  R. L. Sawhney,et al.  Design, development and performance testing of a new natural convection solar dryer , 2002 .

[12]  I. Montero,et al.  Combined combustion of various phases of olive wastes in a conventional combustor , 2007 .

[13]  O. V. Ekechukwu.  Review of solar-energy drying systems I: an overview of drying principles and theory , 1999 .

[14]  T. Koyuncu.  Performance of various design of solar air heaters for crop drying applications , 2006 .

[15]  Brian Norton,et al.  Review of solar-energy drying systems II: an overview of solar drying technology , 1999 .

[16]  Fahrettin Göğüş,et al.  Air drying characteristics of solid waste (pomace) of olive oil processing , 2006 .

[17]  S. Babalis,et al.  Influence of the drying conditions on the drying constants and moisture diffusivity during the thin-layer drying of figs , 2004 .

[18]  I. N. Simate,et al.  Optimization of mixed-mode and indirect-mode natural convection solar dryers , 2003 .

[19]  İbrahim Doymaz,et al.  Drying Characteristics of the Solid By-product of Olive Oil Extraction , 2004 .

[20]  Shailesh Kumar,et al.  A comprehensive procedure for performance evaluation of solar food dryers , 2002 .

[21]  H. P. Garg,et al.  Studies on semi-cylindrical solar tunnel dryers: thermal performance of collector , 2000 .

[22]  Ewa Wäckelgård,et al.  The influence of climate and location on collector performance , 2002 .

[23]  Mohammad Nurul Alam Hawlader,et al.  Development of solar air collectors for drying applications , 2004 .

[24]  R. L. Sawhney,et al.  Review of research and development work on solar dryers for grape drying , 2002 .

[25]  V. K. Vijay,et al.  Experimental studies on drying of Zingiber officinale, Curcuma longa l. and Tinospora cordifolia in solar-biomass hybrid drier , 2005 .

[26]  T. Liang,et al.  Spatial and temporal effects in drying biomass for energy , 1996 .

[27]  A. El-sebaii,et al.  Experimental investigation of an indirect type natural convection solar dryer , 2002 .

[28]  Brian Norton,et al.  Review of solar-energy drying systems III: low temperature air-heating solar collectors for crop drying applications , 1999 .

[29]  Robert H. Driscoll,et al.  The thin-layer drying characteristics of garlic slices , 1996 .

[30]  M. N Nijmeh,et al.  Design and testing of solar dryers for processing food wastes , 1998 .

[31]  Fausto Freire,et al.  PH—Postharvest Technology: Modelling High Temperature, Thin Layer, Drying Kinetics of Olive Bagasse , 2001 .

[32]  B. Bena,et al.  Natural convection solar dryer with biomass back-up heater , 2002 .

[33]  Antonio Casimiro Caputo,et al.  Disposal of by-products in olive oil industry: waste-to-energy solutions , 2003 .

[34]  A. El-sebaii,et al.  Empirical correlations for drying kinetics of some fruits and vegetables , 2002 .

[35]  B. K. Bala,et al.  Simulation of the indirect natural convection solar drying of rough rice , 1994 .

[36]  A. El-sebaii,et al.  Parametric study of a solar air heater with and without thermal storage for solar drying applications , 2000 .

[37]  E. Natarajan,et al.  Experimental investigation of forced convection and desiccant integrated solar dryer , 2006 .

[38]  Arun S. Mujumdar,et al.  Drying Technology in Agriculture and Food Sciences , 2000 .

[39]  A. Midilli,et al.  Mathematical modeling of thin layer drying of pistachio by using solar energy , 2003 .

[40]  F. López-Rodríguez,et al.  Mathematical modelling of thin-layer infrared drying of wet olive husk , 2008 .