The analytical analysis presented in this manuscript was made assuming the location Vagos, Portugal (40°32’42,18"N, 8°42’56,72"O) because this is the site where the prototype will be installed. Climate variables (solar radiation and temperature profiles) were obtained through the

SolTerm data base [1]. In this region, the minimum average temperature is 9,0°C in December and 19,7°C of maximum average temperature in July. Global solar radiation in the horizontal plane varies from a minimum of 1,7 kWh/m2 in December to a maximum of 6,6 kWh/m2, registered in July. Figure 1 presents the solar radiation profile as function of the angle of the solar collector with the horizontal.

Radiation profile presented in Figure 1 was obtained by applying the correction factor only to the direct radiation in spite of the fact that the diffuse radiation, coming on days with clear sky, is not uniformly distributed over the hemisphere but concentrated in the direction of the sun. Correction factor R was defined as Rd = cos 0 / cos 0z, where 0 represents the angle of the solar radiation with the normal of the panel and 0z the angle of the solar radiation with the vertical of the location.

2. System analysis