Analysis of a Closed Loop Solar Energy System Using the -f Chart Method: Effect of Different Brazilian Locations (2013)

This study, conducted by Alexandre M.S. Costa of the State University of Maringá and published by the State University of Ponta Grossa in Brazil, analyzes the annual energy performance of a closed-loop hot water solar thermal system under various weather conditions in 6 Brazilian cities (Curitiba, São Paulo, Rio de Janeiro, Recife, Salvador and Brasília) using the -f chart method. This method is based on 2 different approaches. It calculates the fraction (f) of monthly heat load that comes from solar energy.  The calculation model uses a series of equations which are explained in details in the document.  The results of this analysis show important variations of solar radiation from one season to another; higher in the summer and lower in the winter.  It was also noticed that in the spring and the fall, the latitude of the cities plays a big role in terms of solar radiation. Results also showed a 4% decrease in solar contribution due to heat losses from the storage tank. 

Author: Alexandre M.S. Costa

Pages: 9

Date: 2013

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