In this work, a new prototype of glazed flat plate solar collector is presented and its performance is experimentally characterized. The new collector uses a roll-bond absorber plate made of aluminum. The roll-bond is a production process aimed at manufacturing canalized panels by bonding two aluminum sheets with a rolling technique. Thus, in this prototype, the channels for liquid are integrated in the absorber plate. Measurements of thermal efficiency are reported for two prototypes, one with a black coating and the other with a semi-selective coating and those measurements are compared with those of standard glazed flat plate collectors at the same test conditions. The test runs have been performed in several conditions in order to reproduce different uses: hot water, space heating and solar cooling. The effect of the coating of the absorber is also evaluated and discussed using the experimental data collected. Efficiency test runs have been performed on a test rig both in steady-state and in quasi-dynamic conditions, according to the standard EN 12975-2 (2006). The results are presented in terms of efficiency curves. A three-dimensional model is used to predict the behavior in steady-state conditions of the solar collectors to obtain the efficiency curve. The model was implemented for standard glazed flat plate collectors but, in this work, its use is extended to roll-bond solar collectors and its validation is made by the comparison with the efficiency curve obtained from experimental tests.
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