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Water heating systems using solar energy is the predominant technology for exploitation of solar energy. Solar thermal conversion has higher conversion efficiency for domestic and industrial sectors. Flat-plate collector is the heart of solar water system. Compared to forced circulation, thermosyphon system has a higher impact in domestic sector due to its ease of operation, simplicity and less maintenance. Heat enhancement using passive techniques for natural as well as forced circulation is discussed here.

Amaranthus hypochondriacus was planted in the inter spaces of Simarouba glauca at different distances and in open field conditions to find out the compatibility of the grain crop with that of an oil bearing tree crop. Among the distances from the tree base and pure crop, the open field condition was found to perform well compared to the intercrop. When the distance from tree base was considered, 2.0 m level produced more yield than the other treatments. Soil fertility was found to be reduced under intercropped conditions. Microclimatic factors were found to be ameliorated in the...