As [2] describes, the solar installation is located in CARTIF Foundation Building 1, in Boecillo, Valladolid, in the middle of Spain. (Lat.41° 32’, Long -4° 45’)

There are in that building, a big amount of different heating and refrigeration systems to be used separately or by pairs. It makes possible the use of different control strategies to minimize energy consumption.

There are two meteorological stations too, used to store direct and diffuse radiation, ambient temperature, humidity, wind speed and direction accessible from the Web: www. cartif. es

There are two collector fields, each one with technologies, flat (37,5 m2) and vacuum tubes (40 m2). The second one is mounted on a platform with a single tracking azimuthal to maximize captured energy.

Due to the strong winter conditions, it’s necessary to add an anti-freeze fluid in the primary flow. To separate primary and secondary flows there is a counter flow heat exchanger.

In order to increase the difference between high and low temperatures, and improve the collectors yield, two storage tanks are connected in series.

It also there is a three-way valve between the flat plane and the vacuum tube storage to connect them in series too. Flat panel field will contribute to the system with hot water at a temperature level lower then the vacuum tube ones, because this yield must feed an absorption chiller (35 kW).

There is a natural gas boiler connected in series to produce hot water when the solar system is not able to contribute. Apart from it there is too a cooling tower for the condensation.

As described on [3] to reach our energy objectives, every cooling or heating machine is completely monitored. Temperatures and flows of each machine are stored in a computer through a Lonwork Network. Depending on the use of that values, can be gathered every second, ten seconds or minute.