Official launching of S.O.L.I.D.’s solar cooling system

Energy Cabin from ahead/Fa. S.O.L.I.D

In September 2008 the new solar thermal system providing solar cooling and office heating backup for the corporate buildings of S.O.L.I.D. and our neighbouring partner company was put into operation. Several international partners were present at the official opening ceremony


A total of 57.6 m2 of HT-collectors optimized for the cooling mode provide cooling for the offices in summer whereas during the cooler seasons the system can support the heating of the buildings. The temperature is adjusted over the offices’ ceilings.
The system is also supposed to serve as a prototype, as (apart from the cooling tower which is placed on the roof of the building) all essential components are installed in a 20’ wooden container in front of S.O.L.I.D.’s corporate building. A distinctive feature of the installation is the fact that the collectors (mounted on a timber structure) simultaneously act as a roof for the container and a projecting roof for the entrance area.

Operational principle

Energy Cabin from sidewards/Fa. S.O.L.I.DEnergy Cabin from sidewards/Fa. S.O.L.I.DThe solar energy produced, is fed into a heat storage tank with a capacity of 2 000 l over a heat transfer station (controlled separation of solar system and heating system). A special charging valve allows an optimized layering of the reservoir. The energy stored in the heat storage tank fuels an absorption chiller with a nominal output of 17.5 kW (maximum output: 21 kW). Following the principle “cooling by heating”, this machine provides the energy required by the air conditioning system. After being fed into a cold storage tank with a capacity of 200 l, the cooling energy is transferred to the distributor in the central heating station. The unusable heat resulting from the transformation process is dissipated over a hybrid cooling tower on the roof of the building. A direct link between the cooling distributor and the main pipe of cooling tower makes a so-called “free cooling” mode possible. In this mode the system can achieve partial performance without input from the collectors and the absorption chiller.
All relevant energy flow is recorded by heat meters. The control system of the installation allows constant remote maintenance which makes it possible to continuously remedy deficiencies as well as permanently optimize the system.