Abstract
Sabah, Malaysia is rich with solar energy where the daily mean daylight is the for is available for 4–8 h. The sunlight can be used effectively in a suitable solar crops drying system. Solar crops dryer with mechanical system is an efficient and suitable option for crops drying. Mechanical system can be replaced with a modified chimney and a conceptual design is proposed. Previously, in the laboratory, a number of experiments had been conducted by using conventional chimney and modified chimney with four different heat loads varied from 1 to 2.5 kW and also for different chimney heights varying from 0.3 to 1.2 m as well as three different types of chimney model with face areas of 0.56, 1.00, and 2.25 m2. It had been found that the modified chimney significantly reduced the effect of flow reversal or cold inflow and restored the loss in flow rate. The current study using computational fluid dynamics (CFD) managed to show draft enhancement by the modified chimney and revealed the pressure prior to exit to be higher than ambient compared with the lower pressure in normal chimney, indicating vulnerability of normal chimneys to flow reversal but positive prevention in a modified chimney.
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References
Abdullah, M. O., Mikie, F. A., & Lam, C. Y. (2006). Drying performance and thermal transient study with solar radiation supplemented by forced-ventilation. International Journal of Thermal Science, 45, 1027–1034.
Ameen, A., & Saiful, B. (2004). Investigation into the effectiveness of heat pump assisted clothes dryer for humid tropics. Energy Conversion and Management, 45, 1397–1405.
Chen, Y.S. & Kim, S.W. (1987). Computation of turbulent flows using an extended k-e turbulence closure model, NASA CR-179204.
Christopher, T. B. S. (2012). Electricity from solar energy in Malaysia: Clean, renewable, and abundant energy source, so what’s the problem? http://christopherteh.com/blog/2012/05/solar-malaysia/ Posted on May 4th, 2012.
Chu, C., Rahman, M. M., & Kumaresan, S. (2012a). Effect of cold inflow on chimney height of natural draft cooling towers. Nuclear Engineering and Design, 249, 125–131.
Chu, C. M., Chu, R. K. H., & Rahman, M. M. (2012b). Experimental study of cold inflow and its effect on draft of a chimney. Advanced Computational Methods and Experiments in Heat Transfer XII, WIT Transactions on Engineering Sciences, 75, 73–82.
Folaranmi, J. (2008). Design construction and testing of solar maize dryer. Leonardo Electronic Journal of Practices and Technologies, 13, 122–130.
Forsona, F. K., Nazhab, M. A. A., Akuffoa, F. O., & Rajakaruna, H. (2007). Design of mixed-mode natural convection solar crop dryers: Application of principles and rules of thumb. Renewable Energy, 32, 2306–2319.
Fuller, R.J., Lhendup, T., & Aye, Lu. (2005). Technical and financial evaluation of a solar dryer in Bhutan solar 2005. ANZSES Annual Conference, Dunedin NZ, 28–30 Nov 2005.
Jensen, S. O. & Kristensen E. F. (2001). Test of a solar crop dryer. Danish Technological Institute and Danish Institute of Agricultural Science, www.solenergi.dk/SEC/rapporter/sec-r-6.pdf.
Malaysian Meteorological Department. (2012). Monthly Weather Bulletin-2012. www.met.gov.my.
Oguntola, J. A., Collins, N. N., & Olayinka, A. (2010). Design and construction of a domestic passive solar food dryer. Leonardo Journal of Sciences, 16, 71–82.
PHOENICS. (2011). Parabolic hyperbolic or elliptic numerical integration code series, computational fluid dynamics software, CHAM Ltd., http://www.cham.co.uk.
Santos, B. M., Queiroz, M. R., & Borges, T. P. F. (2005). A solar collector design procedure for crop drying. Brazilian Journal of Chemical Engineering, 22(2), 277–284.
Shaik, Z. A. (2009). Design and development of a solar cloth dryer. Bachelor of Technology in Mechanical Engineering, National Institute of Technology Rourkela. http://ethesis.nitrkl.ac.in/1126/1/project.pdf.
Tarigan, E., & Tekasakul, P. (2005). A mixed-mode natural convection solar dryer with biomass burner and heat storage back-up heater solar 2005. ANZSES Annual Conference, Dunedin NZ, 28–30 Nov 2005.
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Kumaresan, S., Rahman, M.M., Chu, C.M., Phang, H.K. (2013). A Chimney of Low Height to Diameter Ratio for Solar Crops Dryer. In: Pogaku, R., Bono, A., Chu, C. (eds) Developments in Sustainable Chemical and Bioprocess Technology. Springer, Boston, MA. https://doi.org/10.1007/978-1-4614-6208-8_19
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DOI: https://doi.org/10.1007/978-1-4614-6208-8_19
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