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WL 302

* Clear experimental setup
* Heat transfer in pipe flows
* Processing of measured data on a PC
* Closed, insulated hot water circuit


Technical Description

Using the trainer, the characteristic properties of heat transfer in pipe flows can be demonstrated. The heat transfer takes place in a coaxial tubular heat exchanger. The hot water is fed through the inner tube.

Using the trainer both parallel flow and counterflow operation with their different temperature profiles can be demonstrated. The non-linear temperature profile along a heat exchanger can be demonstrated by measuring temperatures at the inlet, outlet and halfway along the pipe. After the experiment the key parameters such as heat flux, heat transfer coefficient and heat loss are determined.

The closed hot water circuit includes a tank with electrical heater and a pump. The hot water temperature is kept constant using a thermostat. The cold water is drawn from the water mains and is fed to a drain after use.

The flow rate and relevant temperatures are recorded by sensors. A display panel for the measured values is located on the instrument panel next to the copper pipework. The measured values are indicated on digital displays and can also be transmitted directly to a PC via USB. The data acquisition software is included.

Learning Objectives / Experiments

- plotting temperature curves
  * in parallel flow operation
  * in counterflow operation
- determination of mean heat flux for parallel flow and counterflow operation
- determination of mean heat transfer coefficient



[1] trainer with a tubular heat exchanger
[2] closed hot water circuit, insulated with pump and heater with thermostat
[3] copper piping
[4] all valves in the cold water circuit to select the operation mode parallel flow or counterflow
[5] temperature measurement with 6 sensors
[6] flow rate measurement with sensor
[7] GUNT software for data acquisition via USB under Windows Vista or Windows 7

Technical Data

- power consumption: 70W
- max. flow rate: 3800L/h
- max. head: 4m
Heater: 2kW, with thermostat: 0...80°C
Heat transfer areas
- hot side: 30159mm²
- cold side: 40212mm²
- mean transfer area: 34945mm²
Tank: 20L

Measuring ranges
- temperature: 0...200°C
- flow rate: 0...720L/h

Dimensions and Weight
LxWxH: 1380x790x1910mm
Weight: approx. 180kg Required for Operation 230V, 50/60Hz, 1 phase or 120V, 60Hz, 1 phase
Cold water connection: min. 150L/h

Scope of Delivery

1 trainer 
1 GUNT software CD + USB cable
1 manual

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