Free and Forced Convection

Heat Transfer Unit

Engineering and Technical
Teaching Equipment
TCLFB

Electronic console

PROCESS DIAGRAM AND UNIT ELEMENTS ALLOCATION

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 INTRODUCTION

Convection is one of the three basic forms of heat transfer. It is characterized by being generated through a fluid (liquid or gas) that
transports heat between areas with different temperature. Convection itself is the heat transfer through the movement of fluids.
There are free and forced convection.
In the free or natural heat transfer, a fluid is hotter or colder and when it is in contact with a solid surface it causes a flow due to the
difference in densities that result from the temperature gradient in the fluid. Density differences cause a slow flow of the fluid with a more
intense heat transfer.
In the forced convection, a blower or a pump generates the flow. In this case, the heat transferred to the fluid particles is lower; however,
more heat than with natural convection is transferred due to a higher mass flow.

GENERAL DESCRIPTION

The Free and Forced Convection Heat Transfer Unit, "TCLFB", allows to study the efficiency of
different exchangers, analyzing the heat transmission coefficients of each exchanger exposed
to different airflows.
Fan placed in the upper part of the tunnel allows controlling the airflow that goes through the
tunnel.
Electronic console contains the control circuits to measure temperatures, electrical control,
electrical supply and speed control of the fan.
The airflow is measured with a flow sensor set at the inferior part of the tunnel.
This unit allows making a study of the heat transmission in three different types of exchangers:
Flat exchanger.
Pins exchanger.
Fins exchanger. TCLFB detail

SPECIFICATIONS

Bench-top unit.
Anodized aluminum frame and panels made of painted steel. Included exchangers
Main metallic elements made of stainless steel.
Diagram in the front panel with distribution of the elements similar to the real one.
Stainless steel tunnel of rectangular section, 700 mm long, painted and resistant to corrosion.
In the tunnel three type of different heat exchangers can be set.
Methacrylate viewer that allows a good visualization of the exchanger that is in use.
Stabilizers to guarantee an uniform air flux.
Eight temperature sensors, (“J” type):
Two temperature sensors measure the air temperature at the inlet and outlet of area of heat exchange.
Flat exchanger
Temperature measurements, at different distances of the base of the pins and fins exchangers, are
made by five temperature sensors that are introduced by one side of the tunnel.
Temperature sensor in the exchangers.
Maximum working temperature: 120 ºC.
Flow sensor for measuring the air flow generated.
Three aluminum exchangers:
Flat heat exchanger: 100 x 100 mm.
Pins heat exchanger: seventeen pins, each one of 10 mm diameter and 125 mm longitude.
Fins heat exchanger: nine fins, each one of 100 x 125 mm.
Variable power heating element: 150 W for each exchanger.
Variable speed fan, which generates air flux through the tunnel, range: 0 – 1200 l/min. Pins exchanger
Power Measurement.
Electronic console:
Metallic box.
Temperature sensors connections.
Selector for the temperature sensors.
Digital display for the temperature sensors.
Flow sensor connector
Heating element connector.
Heating element switch.
Fan switch.
Fan regulator.
Fins exchanger
Wattmeter display.
Main switch.
Cables and accessories, for normal operation.
Manuals: This unit is supplied with the following manuals: Required Services, Assembly and Installation, Starting-up, Safety, Maintenance
& Practices Manuals.
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 EXERCISES AND PRACTICAL POSSIBILITIES

1.- Demonstration of the basic principles of free and forced 11.- Comparative study between the free convection of a horizontal
convection. surface and vertical surface.
2.- Comparison between free and forced convection. 12.- Determination of the Reynolds and Nusselt numbers.
3.- Free convection in flat surfaces.
4.- Forced convection in flat surfaces.
5.- Dependence of the heat transmission with the temperature.
6.- Dependence of the heat transmission with the speed of the
fluid.
7.- Dependence of the heat transmission with the exchanger
geometry.
8.- Temperature distribution in the additional surfaces.
9.- Study of the advantage of using pinned and finned surfaces in
heat transmission in free convection.
10.- Study of the advantage of using pinned and finned surfaces in
heat transmission in forced convection.

REQUIRED SERVICES DIMENSIONS AND WEIGHTS

- Electrical supply: single-phase 200 VAC – 240 VAC/50 Hz or TCLFB:

110 VAC – 127 VAC/60 Hz. Unit:
-Dimensions: 370 x 610 x 920 mm approx.
(14.56 x 24.01 x 36.22 inches approx.)
-Weight: 25 kg approx.
(55.11 pounds approx.)
Electronic console:
-Dimensions: 490 x 330 x 310 mm approx.
(19.29 x 12.99 x 12.20 inches approx.).
-Weight: 10 kg approx.
(22 pounds approx.).

SIMILAR UNITS AVAILABLE

Offered in this catalog:

-TCLFB. Free and Forced Convection Heat Transfer Unit.
Offered in other catalog:
-TCLFC. Computer Controlled Free and Forced Convection Heat Transfer Unit.
-TXC/FF. Free and Forced Convection Heat Transfer Module for TSTCC.
-TXC/FFB. Free and Forced Convection Heat Transfer Module for TSTCB.

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 Optional

TCLFB/ICAI. Interactive Computer Aided Instruction Software:

With no physical connection between unit and computer, this

complete software package consists of an Instructor Software
(EDIBON Classroom Manager -ECM-SOF) totally integrated
with the Student Software (EDIBON Student Labsoft -ESL-
SOF). Both are interconnected so that the teacher knows at any
moment what is the theoretical and practical knowledge of the
students.

Instructor Software

- ECM-SOF. EDIBON Classroom Manager (Instructor Software).

ECM-SOF is the application that allows the Instructor to register students, manage and assign tasks for workgroups, create own content to
carry out Practical Exercises, choose one of the evaluation methods to check the Student knowledge and monitor the progression related
to the planned tasks for individual students, workgroups, units, etc... so the teacher can know in real time the level of understanding of
any student in the classroom.

Innovative features:
• User Data Base Management.
• Administration and assignment of Workgroup, Task and
Training sessions.
• Creation and Integration of Practical Exercises and Multimedia
Resources.
• Custom Design of Evaluation Methods.
• Creation and assignment of Formulas & Equations.
• Equation System Solver Engine. ECM-SOF. EDIBON Classroom Manager (Instructor Software)
Application Main Screen
• Updatable Contents.
• Report generation, User Progression Monitoring and Statistics.

ECAL. EDIBON Calculations Program Package - Formula Editor

Screen

ETTE. EDIBON Training Test & Exam Program Package - Main Screen with
Numeric Result Question

ERS. EDIBON Results & Statistics Program Package - Student

Scores Histogram

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 Optional
Student Software

- ESL-SOF. EDIBON Student Labsoft (Student Software).

ESL-SOF is the application addressed to the Students that helps them to understand theoretical concepts by means of practical exercises
and to prove their knowledge and progression by performing tests and calculations in addition to Multimedia Resources. Default planned
tasks and an Open workgroup are provided by EDIBON to allow the students start working from the first session. Reports and statistics
are available to know their progression at any time, as well as explanations for every exercise to reinforce the theoretically acquired
technical knowledge.
Innovative features:
• Student Log-In & Self-Registration.
• Existing Tasks checking & Monitoring.
• Default contents & scheduled tasks available to be used from
the first session.
• Practical Exercises accomplishment by following the Manual
provided by EDIBON.
• Evaluation Methods to prove your knowledge and progression.
ESL-SOF. EDIBON Student LabSoft (Student Software)
• Test self-correction. Application Main Screen
• Calculations computing and plotting.
• Equation System Solver Engine.
• User Monitoring Learning & Printable Reports.
• Multimedia-Supported auxiliary resources.

For more information see ICAI catalogue. Click on the following link:
www.edibon.com/en/files/expansion/ICAI/catalog

EPE. EDIBON Practical Exercise Program Package Main Screen

ERS. EDIBON Results & Statistics Program Package - Question Explanation ECAL. EDIBON Calculations Program Package Main Screen

* Specifications subject to change without previous notice, due to the convenience of improvement of the product.
REPRESENTATIVE:

C/ Julio Cervera, 10-12-14. Móstoles Tecnológico.

28935 MÓSTOLES. (Madrid). ESPAÑA - SPAIN.
Tel.: 34-91-6199363 Fax: 34-91-6198647
E-mail: edibon@edibon.com Web: www.edibon.com

Edition: ED01/20
Date: September/2020