African Journal of
Agricultural Research

  • Abbreviation: Afr. J. Agric. Res.
  • Language: English
  • ISSN: 1991-637X
  • DOI: 10.5897/AJAR
  • Start Year: 2006
  • Published Articles: 6693

Full Length Research Paper

Performance evaluation of a v-groove solar air collector for drying maize (Zea mays) in lraq

Mudafer kareem Abdullah and Ahmed Abed Gatea*
Department of Agricultural mechanization, College of Agriculture, University of Baghdad,Baghdad, lraq.
Email: [email protected]

  •  Accepted: 31 January 2011
  •  Published: 18 February 2011

Abstract

 

In this work, a solar drying system was constructed, consisting of three parts (solar collector, drying chamber, and air blower). Solar collector having V-corrugated absorption plate of two air passes, a single glass cover was used. The total area of the collectors is 2.04 m². The dimension of the drying chamber is 1.06, 0.66 and 0.56 m for width, depth, and height, respectively. 38 kg of corn were dried. The moisture content was reduced from 21 to 13% within four hours drying. The drying air temperatures at the inlet of the dryer were found in the range of 30 to 45°C when the range of ambient air temperature was from 8.5 to 20°C and total solar radiation intensity was from 270 to 560 W/m2. Increasing volumetric air flow rate from 0.025 to 0.030 m3/s raises the daily solar collector efficiency by 3.25%, while increasing volumetric air flow rate from 0.030 to 0.035 m3/s raises the solar daily collector efficiency by 11.11%. The drying rate is reduced with the decrease of moisture content. Efficiency of the collector is very much dependant on air flow rate.

 

Key words: Solar energy, solar air collector, two passes collector, V-corrugated collector, solar drying, performance evaluation.