As many studies highlight [5-9], to implement one adequate configuration and control system on a solar cooling installation, can vary importantly the performance of this facility.

With regard to the control of absorption chillers, [10,11] demonstrate the need to control the chiller by means of the temperature or the generator flow, affecting to the performance as well as to the load capacity.

Described below are the basic controls considered, that later will be applied to the different configurations studied for the installation.

2.1. Starting criterions for the solar pump

Start based on differential temperature.

The starting signal for the pump is given in function of the difference between the temperature of the lower part of the tank and the one at the collectors output. Is associated to controls on-off.

Start based on constant radiation.

The pump starts when is reached a value for the global radiation higher than a threshold. This kind of criterion does not take into account the particular conditions in which the installation is in each moment what force to set thresholds relatively low, and this make the pumps to work more time than the necessary. This strategy has not been implemented on the simulation.

Start based on critical radiation.

The critical radiation [12], allows to calculate the needed value of the radiation to reach a fixed average temperature on the collector, depending on its parameters and the ambient temperature. It has been developed a controller that calculates the critical radiation and start up the installation when this value is exceeded.