The HL 313 trainer demonstrates the main aspects of domestic solar water heating.

  The solar energy is converted into heat by a solar collector and is transferred to the heat transfer medium in a solar circuit. The heat is transferred to the hot water circuit via a heat exchanger.

  A solar controller controls the hot water circuit pump and the solar circuit pump. The solar circuit is protected by an expansion vessel and a safety valve.

  The trainer is built using commercially available components. It is possible to study the complete heating process within the time frame of a laboratory lesson.

  The solar circuit flow rate, temperatures at the collector inlet, the collector outlet and the reservoir are measured. In addition, the feed flow and the return flow temperatures are displayed at the solar circulation station, following commercial practice.

  The system should be operated with sufficient irradiation intensity using direct sunlight or the optionally available artificial light source HL 313.01.

  The well-structured instructional material sets out the fundamentals and provides a step-by-step guide through the experiments.

- Familiarisation with a solar thermal circuit
- Functioning of a solar collector

- Correlation between temperature difference

  (collector - ambient) and collector efficiency

- Correlation between flow rate and effective power

- Calculating effective power

together with device to measure the irradiation intensity (not supplied)

- determination of collector efficiency