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WL 308

- Operation in parallel flow or counterflow
- Temperature measuring point on inner tube wall
- Hot water circuit with temperature controller


Technical Description

WL 308 is used to demonstrate the characteristic properties of heat transfer in a tubular heat exchanger. Tubular heat exchangers represent the simplest type of heat exchanger and are the preferred solution for transferring heat with high pressure differences or between high viscosity media (sludge). This type is also used to enable the temperature of the transported medium to be kept constant. 

The experimental unit features a pipe-in-pipe tube as the heat exchanger, a heated tank and pump for the hot water circuit, connections for the cold water circuit, and displays and controls. Hot water in the inner tube and cold water in the outer tube flow either in a parallel flow or in a counterflow. Part of the thermal energy of the hot water is transferred to the cold water. Valves are used to adjust the flow of hot and cold water. The cold water circuit is fed from the laboratory supply.

The non-linear temperature curve along a heat exchanger can be demonstrated by measuring the inlet and outlet temperatures as well as an additional temperature measuring point half way along the heat exchange path. During this process the water temperature in the inner and outer tubes is measured. Additional measurement of the inner tube wall temperature permits investigation of the heat transfer at the wall. 

In evaluation of the experiment key parameters such as the heat flux and heat transfer coefficient are determined.

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

Learning Objectives / Experiments

- Heat balances
- Determining the heat transfer coefficient 
- Operation in parallel flow and counterflow
- Heat transfer on tube walls and in the flow
- Influence of the mass flow rate on the temperature curve


[1] Heat transfer in a tubular heat exchanger
[2] Hot water circuit with tank, heater, temperature controller and pump
[3] Cold water circuit from laboratory supply
[4] Temperature controller controls the water inlet temperature for the hot water circuit
[5] Parallel flow and counterflow operation adjustable
[6] Flow rates adjustable using valves 
[7] 7 temperature sensors with digital display and selector for temperature measuring points
[8] Process schematic

Technical Data

Heat exchanger

- tubes made of Cu, thermal conductivity k: 384W/mK
- length: 600mm
- mean transfer area: 0,013m² 
- tube diameters (t=1mm): D=8mm, D=15mm 
- max. flow rate: 4m³/h
- max. head: 4m 
- power consumption: 70W 
Heater: 3kW, with thermal cut-out
Tank: 6,5L
Measuring ranges
- flow meter: 20...250L/h
- temperature: 0...100°C

Dimensions and Weight
LxWxH: 950x550x1.060mm
Weight: approx. 50kg Required for Operation 230V, 50/60Hz, 1 phase or 230V, 60Hz/CSA, 3 phase
Cold water connection, drain

Scope of Delivery
1 experimental unit
1 set of instructional material

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