Planning over the intermediate and long terms for the operation of sol
ar energy systems must be based on the use of measured data and perfor
mance models of system components. We present a dynamic model for pred
icting the thermal performance of a low-temperature solar power plant.
We analyse the optimal control regime for energy management. Validati
on of the model was performed on a large solar plant located in the no
rth of Tunisia. The results showed good agreement between measured and
model values. During the cold season, the plant efficiency increases
considerably when a greenhouse is connected to the power plant. (C) 19
97 Elsevier Science Ltd.