This question Question 1:-Explain the effect of the air velocity on the heat transfer by convection.-Explain the effect of extended surface on heat transfer by convection.-Which is the most effective plate in heat convection among the three platesused in this experiment justify your answer.-Discuss the errors and their sources which might occurred in this experiment and affected its results Forced ConvectionObjectives:Demonstration of the relationship between Power input and Surface TemperatureconvectionforcedDescription:The H111P Free and Forced convectionfrom Flat Finned and Pinned Platesenables students to investigate heattransfer from various surfaces in free andforced convection.The range of heated plates demonstratesthe effect of extended surfaces (fins andpins) on the rate of heat transfer. TheH111P is designed to be used with, and tobe installed alongside, the Heat TransferService Unit H111.8The accessory comprises a rectangularduct (6) mounted on the discharge of abase mounted centrifugal fan. In the middleof the duct is an air velocity sensor (5) thatallows the air velocity within the duct to bemeasured and displayed (meters/second)on the air velocity display (4) below thebase. At the centre of the duct is anaperture that allows any of the three heatedplates (8) supplied to be installed.5671.2.Main SwitchInstrument Fuse3.Fan SwitchAir Velocity Display (m/s)Air Velocity Sensor(Hot WireAnemometer)4.5.6.Duct7.T9 Air Temperature48.Heated Plate239.Air ThrottleFigure 1: SCHEMATIC DIAGRAM H111Plof 6Work sheetLaboratoryHeat Transfer-MENG 420LExperimentH4Unit: H111PForced ConvectionA flat plate, pinned plate, or finned plate heat exchanger may be installed in the ductand secured by two toggle clamps. Each exchanger incorporates an electric heatermat rated at 100w at 240V. Each of the heated plates incorporates thermostaticprotection against overheating.The heater surftace temperature (T1) is continuously monitored and displayed by thetemperature indicator when plugged in to the console.The Pinned plate is fitted with three extra thermocouples (T3, 4 and 5) to measurethe temperature of extended surfaces. T5 is furthest from the heater.The Finned plate is fitted with three extra thermocouples (T6, 7 and 8) to measurethe temperature of extended surfaces. T8 is furthest from the heater.The T9 air temperature (7) sensor is located at the base of the duct and records thetemperature of the air flowing over the heated plate.Thermocouple attachment points on the heat exchangers are protected by a coveringof adhesive.The air velocity passing the heated plates can be varied from zero to more than 8m/sdepending upon the local mains voltage and supply frequency. The air velocitysensor (5) is permanently mounted in the duct and connects to the console belowusing a line plug and socket.The air velocity is controlled by the use of an intake air throttle (9). For naturalconvection experiments, the fan may be switched off using the fan switch(3) on theH111P console.All thermocouples are 'Duplex'. The primary set of thermocouples terminates with aminiature plug (identified T1, and T3 to T8) for insertion into the control consolesockets.The secondary set of thermocouples terminates with 2-way edge-connectors suitablefor the Hilton DataAcquisition Uparade is installed. The panel mounted socket labeled 'T1 out providesonal HC111A Data

Answered: Question 1: -Explain the effect of the…

Question 1: -Explain the effect of the air velocity on the heat transfer by convection. -Explain the effect of extended surface on heat transfer by convection.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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This question

Question 1:
-Explain the effect of the air velocity on the heat transfer by convection.
-Explain the effect of extended surface on heat transfer by convection.
-Which is the most effective plate in heat convection among the three plates
used in this experiment justify your answer.
-Discuss the errors and their sources which might occurred in this experiment and affected its results

Forced Convection
Objectives:
Demonstration of the relationship between Power input and Surface Temperature
convection
forced
Description:
The H111P Free and Forced convection
from Flat Finned and Pinned Plates
enables students to investigate heat
transfer from various surfaces in free and
forced convection.
The range of heated plates demonstrates
the effect of extended surfaces (fins and
pins) on the rate of heat transfer. The
H111P is designed to be used with, and to
be installed alongside, the Heat Transfer
Service Unit H111.
8
The accessory comprises a rectangular
duct (6) mounted on the discharge of a
base mounted centrifugal fan. In the middle
of the duct is an air velocity sensor (5) that
allows the air velocity within the duct to be
measured and displayed (meters/second)
on the air velocity display (4) below the
base. At the centre of the duct is an
aperture that allows any of the three heated
plates (8) supplied to be installed.
5
6
7
1.
2.
Main Switch
Instrument Fuse
3.
Fan Switch
Air Velocity Display (m/s)
Air Velocity Sensor(Hot Wire
Anemometer)
4.
5.
6.
Duct
7.
T9 Air Temperature
4
8.
Heated Plate
2
3
9.
Air Throttle
Figure 1: SCHEMATIC DIAGRAM H111P
lof 6
Work sheet
Laboratory
Heat Transfer-MENG 420L
Experiment
H4
Unit: H111P
Forced Convection
A flat plate, pinned plate, or finned plate heat exchanger may be installed in the duct
and secured by two toggle clamps. Each exchanger incorporates an electric heater
mat rated at 100w at 240V. Each of the heated plates incorporates thermostatic
protection against overheating.
The heater surftace temperature (T1) is continuously monitored and displayed by the
temperature indicator when plugged in to the console.
The Pinned plate is fitted with three extra thermocouples (T3, 4 and 5) to measure
the temperature of extended surfaces. T5 is furthest from the heater.
The Finned plate is fitted with three extra thermocouples (T6, 7 and 8) to measure
the temperature of extended surfaces. T8 is furthest from the heater.
The T9 air temperature (7) sensor is located at the base of the duct and records the
temperature of the air flowing over the heated plate.
Thermocouple attachment points on the heat exchangers are protected by a covering
of adhesive.
The air velocity passing the heated plates can be varied from zero to more than 8m/s
depending upon the local mains voltage and supply frequency. The air velocity
sensor (5) is permanently mounted in the duct and connects to the console below
using a line plug and socket.
The air velocity is controlled by the use of an intake air throttle (9). For natural
convection experiments, the fan may be switched off using the fan switch(3) on the
H111P console.
All thermocouples are 'Duplex'. The primary set of thermocouples terminates with a
miniature plug (identified T1, and T3 to T8) for insertion into the control console
sockets.
The secondary set of thermocouples terminates with 2-way edge-connectors suitable
for the Hilton Data
Acquisition Uparade is installed. The panel mounted socket labeled 'T1 out provides
onal HC111A Data

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