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Solar energy is an effective and sustainable way to reduce electricity consumption. Solar water heating systems can operate with natural or forced flow, depending on the size of the facility. The objective of this study was to quantify the load losses in three models of low cost collectors (C1, C2 and C3) when subjected to flow variations in forced flow regime in relation to the material used in the collection of the collectors, to the flow direction of the fluid and the installation arrangement of the collectors. The C1 collector consisted of Polyvinyl Chloride (PVC) pipes with 20 mm diameter, Polyethylene terephthalate (PET) bottles and long life packages. The collector C2 was assembled with PVC lining with the dimensions of 0.2 m wide and 0.08 m thick and the collector C3 was constituted with 0.14 m of width and 0.014 m of thickness. The dimensions of the collector conduits and the fluid flow influence the load loss of the collectors. The constructive layout that presented positive results was the PVC pipe collector, installed in a parallel arrangement, with water flow in the parallel direction and flow rate less than 1 m3h-1.

ANÁLISE DA PERDA DE CARGA EM COLETORES SOLARES DE BAIXO CUSTO QUANTO ÀS CARACTERÍSTICAS CONSTRUTIVAS