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HL 313

- Conversion of solar energy into heat
- Trainer with real-world components
- Pivotable flat collector
- System with heat exchanger and two separate circuits
- Solar controller with data logger and USB interface


Technical Description

The HL 313 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 converted into heat in a commercially available flat collector and transferred to a heat transfer fluid in the solar circuit. The heat then gets into the hot water circuit via a heat exchanger.

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.

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

Learning Objectives / Experiments

- familiarisation with the functions of the flat collector and the solar circuit
- determining the net power
- relationship between flow and net power
- determining the collector efficiency
- relationship between temperature difference (collector/environment) and collector efficiency



[1] trainer for investigating the function and operating behaviour of a flat collector
[2] solar thermal flat collector with selectively absorbing coating
[3] adjustable collector tilt angle
[4] solar circulation station with pump, expansion vessel and safety valve
[5] hot water circuit with buffer tank, pump and plate heat exchanger
[6] four bimetallic thermometers
[7] solar controller with temperature, flow and illuminance sensors
[8] data logger with USB interface
[9] operation with solar radiation or HL 313.01 Artificial Light Source

Technical Data

Solar circuit
- collector
  absorbing surface: 2,3m² 
  rated throughput: 20...70L/h  
  operating pressure: 1...3bar
- safety valve 4bar
Hot water circuit
- plate heat exchanger: 3kW, 10 plates
- buffer tank 70L

Measuring ranges
- flow rate: 20...150L/h
- temperature: 4x 0...120°C

Dimensions and Weight
LxWxH: 1660x800x2300mm
Weight: approx. 240kg Required for Operation 230V, 50/60Hz, 1 phase or 120V, 60Hz/CSA, 1 phase

Scope of Delivery
1 trainer
1 set of instructional material

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