The HL 314 trainer can be used to demonstrate the principal aspects of solar thermal domestic water heating in a system with components used in real world applications.
Radiant energy is absorbed and converted into heat in a commercially available evacuated tube collector. Heatpipes located inside the absorbers enable heat transfer to a heat transfer fluid in the solar circuit. Subsequently another heat exchanger feeds the heat into the hot water circuit and into the storage tank.
A solar controller controls the pumps for the hot water and solar circuits. The solar circuit is protected by an expansion tank and a safety valve.
The trainer has been designed so that it is possible to carry out a complete preheating as part of a practical experiment.
The temperatures in the storage tank, at the outlet from and the inlet to the collector are measured, as is the flow in the solar circuit. Additionally, as in practice, the temperatures of the inlet and return are displayed on the solar circulation station.
In order to ensure there is sufficient illuminance, the system should be operated with solar radiation or the optionally available HL 313.01 Artificial light source.