| dc.creator |
B., Ramadhani |
|
| dc.creator |
Minja, Rwaichi J. A. |
|
| dc.creator |
Njau, Karoli N. |
|
| dc.date |
2019-07-04T12:38:34Z |
|
| dc.date |
2019-07-04T12:38:34Z |
|
| dc.date |
2015-02-05 |
|
| dc.date.accessioned |
2022-10-25T09:24:33Z |
|
| dc.date.available |
2022-10-25T09:24:33Z |
|
| dc.identifier |
1991-637X |
|
| dc.identifier |
DOI: 10.5897/AJAR2012.2179 |
|
| dc.identifier |
http://dspace.nm-aist.ac.tz/handle/123456789/360 |
|
| dc.identifier.uri |
http://hdl.handle.net/123456789/95555 |
|
| dc.description |
Research Article published by the African Journal of Agricultural Research Vol. 10(6),
5 February 2015 |
|
| dc.description |
Solar drying is one of the promising methods of reducing post-harvest losses in rural areas. Studies
have shown that, heat transfer mechanisms in a solar collector influences the performance of solar
dryers. This study aims at improving heat transfer in flat plate solar collectors by designing different air
flow patterns inside the collector. Three flat plate solar collectors were constructed by using
Pterocarpus timber (Mninga) and tested for their effect in heat transfer at various flow patterns. Three
different flow patterns namely: single duct front pass, double duct parallel flow and double duct counter
flow were designed and tested. Experimental results show that collector efficiency of single duct front
pass, double duct front pass and double duct counter flow were 30.6, 36.1 and 38.2% respectively. It
was found that, double duct flow gives improved performance compared to single duct flow due to the
increased heat transfer area. In additional, double duct counter flow showed superior performance
compared to double duct parallel flow due to extended heat transfer area and the advantage of air
preheating at the inlet which reduces heat losses through glazing. Through this study, it was concluded
that, solar collector designs with double duct counter flow can improve collector performance for up to
8.3% compared to single duct front pass. |
|
| dc.format |
application/pdf |
|
| dc.language |
en_US |
|
| dc.publisher |
African Journal of Agricultural Research |
|
| dc.subject |
Single duct front pass |
|
| dc.subject |
double duct parallel flow |
|
| dc.subject |
double duct counter flow |
|
| dc.subject |
solar intensity |
|
| dc.title |
Experimental analysis of air flow patterns in perfomance of flat plate solar collectors |
|
| dc.type |
Article |
|