The maximum performance for solar cooling systems (solar COP) with Flat Plate collectors (FP) happens at temperatures between 70-80°C and corresponds to 35%. Using Vacuum Tube Collectors (VTC), the solar COP increases by 9% for a temperature range of 80-90°C. The use of a double effect absorption chiller with VTC leads to a solar COP between 60-65% for a temperature range of 110-135°C.

4.1 Influence of collector tilt angle and orientation

Regarding inclination, as expected, the production is optimised for a tilt angle corresponding to latitude-50 (optimised for all year collection). A solar system, if installed in a horizontal plane, has a penalization on the range of 2-32% (absolute values) — with lower penalization for places with lower latitudes and buildings with more representative cooling loads — if installed in a vertical wall the penalization lays in the range of 25-60% (absolute values).

Deviations up to 60° relative to South, reduce solar fraction between 3 and 10% (absolute values).