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WL 352

Free and Forced Convection Unit / PC

Technical Description

The test unit for free and forced convection is designed as a benchtop unit. Air is fed through a duct and heated at heater elements with different shaped surfaces. 3 interchangeable heater elements are provided. A fan can be switched on for experiments on forced convection. The temperature and air velocity are measured using sensors. The measured values can be read on digital displays. The measured data can be transferred directly from the display and control unit to a PC. A data acquisition card and software are included.

Learning Objectives / Experiments

- Demonstration of the basic principles of free and
forced convection
- Demonstration of heat transfer at a flat plate
- Demonstration of heat transfer at a pipe bundle
- Demonstration of heat transfer at fins
- Measurement of relevant temperatures and the flow
velocity
- Determination of the coefficients of heat transfer
- Comparison between free and forced convection
- Temperature distribution in the heat exchanger
- Determination of the Reynolds and Nusselt
numbers

Features

* Clearly laid out benchtop unit for the experimental
determination of heat transfer₁
* Measured data acquisition using electronic sensors₁
* Processing of measured data on a PC₁
* Heat transfer surfaces that can be changed₁
* Comprehensive description of the experiments

Alternative products

WL 310 -- Cross-Flow Heat Exchanger

Specification

[1] Test unit for demonstrating the transfer of heat by convection
[2] Benchtop unit
[3] Recording of measured data using electronic sensors
[4] Processing of measured data on a PC
[5] Length of air duct 1m, flow cross-section 120x120mm, V_max 170m³/h, with axial fan
[6] LabView software under Windows XP

Technical Data

Heating elements

- temperature limiting using bimetallic strip at 120°C

- max. heater power: 170W
- flat plate surface area: 0.014m²
- pipe bundle surface area: 0.098m²
- surface area of fins: 0.14m²

Flow sensor measuring ranges
- temperature of the studied medium: -20...85°C
- ambient temperature: 0...60°C
- velocity: 0...10m/s
Measuring ranges

- PTC sensor: -40...150°C

- thermocouple type K: 0...1000°C

Dimensions and Weight

l x w x h : 700 x 350 x 1200 mm
Weight : approx. 25 kg

Connections

230V, 50/60Hz, 1 phase or 120V, 50/60Hz, 1 phase or 120V, CSA, 1 phase

Scope of Delivery

1 experimental set-up, complete

3 heating elements

1 display and control unit

1 data acquisition card with software

1 instruction manual

Order Details

060.35200 WL 352 Free and Forced Convection
Unit / PC