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HL 353.02 Heat Distribution and Control in Heating Systems
Education / GUNT Hamburg / Thermal Engineering and HVAC / Heating and Ventilation in Buildings /

A complete domestic heating system can be set up using the trainer HL 353.02 together with a hot water generator, e.g. HL 353. Hot water passes through the radiators and heats the room air.

  HL 353.02 contains two heating circuits. Both heating circuits are equipped with commercially available heating technology control devices. Each heating circuit contains a circulating pump.

  The simple heating circuit with one subcircuit contains two flat radiators and is controlled by a temperature-led controller. A three-way mixing valve is the actuator. A simulator is supplied for varying the outside temperature.

  The heating circuit with two subcircuits contains four radiators and two heating controllers. Solenoid valves enable control of the heat distribution in the two subcircuits.

  The trainer is supplied with hot water from the supply unit HL 353 and is connected to the feed and return flow connectors using hoses with quick-release couplings. 

  Measuring points for temperatures, pressures, differential pressures and flow rates are available. The heating circuit with two subcircuits contains two heat meters to enable energy calculations and evaluations.

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

Learning Objectives / Experiments

- design of a room heating system with controller and

  * temperature-led heating controller (outside

    temperature) with three-way mixing valve
  * simulator for varying outside temperature

- function and design of a room heating system

  divided into sections

- hydronic balancing of heating circuits with multiple


- function and design of commercially available

  heating technology components

- measurement of differential pressures,

  temperatures and flow rates

- energy calculation and evaluation of emitted

  heating capacity based on measured quantity of


- reading and comprehension of symbols and

  process schematics


[1] together with hot water generator: set-up of a complete domestic heating system with 2 independent heating circuits

[2] heating circuit (A) with 1 subcircuit contains 2 flat radiators, 1 circulating pump, 1 heating controller with 3-way mixing valve and simulator for variation of outside temperature

[3] heating circuit (B) with 2 subcircuits contains 4 radiators, 1 circulating pump, 2 heating controllers, 2 solenoid valves

[4] flow control valves for hydronic balancing in heating circuit with 2 subcircuits

[5] measurement of flow rate and pressure

[6] 9 measuring points for differential pressure and temperature (temperature measurement via sensors of HL 353)

[7] hot water connections with quick-release couplings


Technical Data

Flat radiator, aluminium

- heating capacity: 545W at feed flow 70°C, return

  flow 55°C and ambient temperature 20°C

Flat radiator, steel

- heating capacity: 665W at feed flow 70°C, return

  flow 55°C and ambient temperature 20°C

Radiator, steel

- heating capacity: 492W at feed flow 70°C, return

  flow 55°C and ambient temperature 20°C


- max. power consumption: 60W

- max. flow rate: 3600L/h

- max. head: 4m

Heat meter: 20...90°C, 1m3/h


Measuring ranges

- pressure: 2x 0...1.6bar

- differential pressure: 1x 0...0.25bar

- flow rate: 3x 20...250L/h


Dimensions and Weight

LxWxH: 2500x760x2000mm

Weight: approx. 185kg

Required for Operation
230V, 50Hz, 1 phase
Scope of Delivery

1 trainer

1 set of instructional material

Order Details

065.35302  HL 353.02  Heat Distribution and Control in Heating Systems