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\hypersetup{pdftitle={Experimental Evaluation of Phase Change Materials (PCM) Applied to Solar Dryers},pdfauthor={Mario Alberto Escobar Ochoa, Sonia Lucia Rincon Prat, Patricia Cuervo Andrade},pdfsubject={Tropentag 2016: Abstract},pdfkeywords={Phase change materials, solar dryers, thermal storage system},pdfpagemode=None,colorlinks=true}
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\parbox[b]{13.4cm}{\centering \large{\textbf{Tropentag, September 18-21, 2016, Vienna, Austria}}\\[1ex] \Large{``Solidarity in a competing world ---\\fair use of resources''\\[2ex]}}
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\begin{center}
\Large{\textbf{Experimental Evaluation of Phase Change Materials (PCM) Applied to Solar Dryers\footnote{\textbf{Contact Address:} Sonia Lucia Rincon Prat, National University of Colombia, Dept. of Mechanical and Mechatronics Engineering, Carrera 30 No. 45 - 03, 1~Bogota, Colombia, \mbox{e-mail}: \email{slrinconp@unal.edu.co}}\\[0.8ex]}}
\normalsize{\textsc{Mario Alberto Escobar Ochoa$^{1}$, Sonia Lucia Rincon Prat$^{2}$, Patricia Cuervo Andrade$^{3}$}}
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\begin{itemize*}
\item[]{\small{\textit{$^{1}$National University of Colombia, Dept. of Mechanical and Mechatronics Engineering, }}}
\item[]{\small{\textit{$^{2}$National University of Colombia, Dept. of Mechanical and Mechatronics Engineering, Colombia}}}
\item[]{\small{\textit{$^{3}$Universidad Pontificia Bolivariana, Research Group on Biomass and Optimization of Thermal Processes, Colombia}}}
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\index[author]{Escobar Ochoa, Mario Alberto}
\index[author]{Rincon Prat, Sonia Lucia}
\index[author]{Cuervo Andrade, Patricia}
\begin{center}
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\textbf{Abstract}
\begin{abstract}
\normalsize{
The drying of agricultural products requires high"=energy consumption during processing. To mitigate this impact the use of solar energy has been extensively implemented. However, solar dryers have stability problems due to unstable energy delivery, as they depend on weather conditions and geographical location. During drying beneficial compounds for human health and organoleptic properties of the product should be maintained.  Therefore, it is important that the drying system is able to maintain a constant temperature within the drying chamber and a continuous operation to surpass external fluctuations of solar radiation. Latter prevents rehydration due to condensation of water present in the drying air resulting in damage caused by chemical deterioration.



The aim of this research is to study the performance of a thermal energy storage system (TESS), based on the use of phase change materials (PCMs), in the drying of agricultural products.  The experimental work has been divided into two stages: 1. Evaluation of the process parameters under controlled conditions in a laboratory facility and 2. Evaluation of the performance of the TESS system by implementing it in a Hohenheim"=type tunnel dryer.  In the laboratory facility the thermal performances of the PCMs are determined varying physical parameters such as air speed, air temperature and incident radiation.  This information is used to make the design and implementation of the TESS in the tunnel dryer.  Stearic acid and refined paraffin are used as PCMs.  These materials were selected based on their melting temperature which is similar to the optimum temperatures for drying of products that require low drying temperature, such as, as aromatic plants.



The time and quantity of energy release as a function of the air velocity and temperature and the efficiency of the process are determined



}

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\noindent \textbf{Keywords:} Phase change materials, solar dryers, thermal storage system
\index[key]{Phase change materials}
\index[key]{Solar dryers}
\index[key]{Thermal storage system}
\end{document}
