To simulate the selected collectors, type 536 from the TESS library was used. This type is based on the theoretical equations developed in[3], see also[4]. This model basically follows the equation:

-—(t — T )

CR in amb /

With R1 and R2 as modifiers for flow correction different from the tested flow rate, Nparallel as the number of collectors in parallel, F1 and F2 as the intercept and slope of the collector efficiency curve and CR as the concentration ratio of the trough. Since the collector had physically parallel rows which where connected hydraulically in series, Nparallel was set to 1. The one-dimensional IAM-values as well as both F1 and F2 (0,76 and 4,17) where calculated from data provided by the manufacturer. The concentration ratio of the RMT is 7.165 (ratio of the net aperture area to the receiver area). By using an equation to reduce the incident beam radiation, the possible effect of soiling of the coated polished aluminium reflector caused by the exhaust of the nearby chimneys was taken into account. The shading of parallel rows was simulated with a shading mask (type 30) of the TRNSYS standard component library, for precise description see[5].

4.2 Absorption chiller

The absorption chiller is a derivation of Robur model ACF 60 LB, which is a single stage — gas fired — air cooled (dry fans) — aqua ammonia absorption chiller for low temperature brine generation. The chiller was adapted to cope with solar heat by replacing the gas burner with a heat exchanger wrapped around the generator. Chillers’ main technical specifications and performance figures are reported in Tablel and Figures 4 and 5 respectively.