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Objectives of this experiment

Elements Of Electromagnetics
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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Objectives of this experiment
Check the box belongs to its respective objective(s). Multiple answers could be selected To demonstrate the differences between counter-current flow (flows in opposing directions) and co-current flows (flows in the same direction) and the effect on heat transferred, temperature efficiencies and temperature profiles through a concentric tube heat exchanger. The observation of unsteady state conduction of heat to the center of a solid shape when a step change is applied to the temperature at the surface of the shape. To demonstrate the relationship between Air Velocity and Surface Temperature in forced convection. To measure the temperature distribution for steady state conduction of energy through a uniform plane wall and demonstrate the effect of a change in heat flow. To measure the temperature distribution for steady state conduction of heat energy through the wall of a thick cylinder (Radial energy flow) and demonstrate the effect of a change in heat flow.
Transcribed Image Text:Check the box belongs to its respective objective(s). Multiple answers could be selected To demonstrate the differences between counter-current flow (flows in opposing directions) and co-current flows (flows in the same direction) and the effect on heat transferred, temperature efficiencies and temperature profiles through a concentric tube heat exchanger. The observation of unsteady state conduction of heat to the center of a solid shape when a step change is applied to the temperature at the surface of the shape. To demonstrate the relationship between Air Velocity and Surface Temperature in forced convection. To measure the temperature distribution for steady state conduction of energy through a uniform plane wall and demonstrate the effect of a change in heat flow. To measure the temperature distribution for steady state conduction of heat energy through the wall of a thick cylinder (Radial energy flow) and demonstrate the effect of a change in heat flow.
Procedure The same procedure is utilized for the three types of plate, Flat, Pinned and Finned. (i) Ensure the instrument console main switch is in the off position. Ensure the fan is switched off. 4 of 6 Wor kshe Laboratory Heat Transfer-MENG 420L Experiment H4 Unit: H111P Forced Convection (ii) If the flat (pinned or finned) plate is not in position, open the toggle clamps. Replace with the flat (pinned or finned) plate and close the toggle clamps. Note that with the plate heat exchangers the power leads exit from the top of the plates. Refer to the figure 1. (ii) Note that the flat plate will have the minimum blockage effect upon the air stream and the pinned plate will have the maximum. Hence it will not be possible to achieve the same maximum air velocity reading (fan at full speed) with the pinned plate in position as with the flat plate in position. If direct comparison between finned, pinned and flat plate performance is required then it would be beneficial to test the pinned plate first in order to establish the maximum possible velocity reading U. Then the remaining plates can be tested under similar or lower air flow conditions. (iv) Switch on the main switch (1) and set air velocity to a low value by closing the air Throttle (9). Increase the heater power to a suitable level (e.g. 220 Volts) such that ts (T1) does not exceed 100°C. Allow the temperatures to stabilize and then record the surface temperature ts (T1), the heater supply voltage V, heater current I and the air velocity U. (v) Maintain the heater voltage at the same condition and then increase the air velocity by opening the air throttle (9). Once again allow the temperatures to stabilize and repeat the readings. Repeat the procedure at increasing air velocity if required. (vi) For direct comparison repeat the procedure for the three plates under similar heat input conditions and at similar velocities.
Transcribed Image Text:Procedure The same procedure is utilized for the three types of plate, Flat, Pinned and Finned. (i) Ensure the instrument console main switch is in the off position. Ensure the fan is switched off. 4 of 6 Wor kshe Laboratory Heat Transfer-MENG 420L Experiment H4 Unit: H111P Forced Convection (ii) If the flat (pinned or finned) plate is not in position, open the toggle clamps. Replace with the flat (pinned or finned) plate and close the toggle clamps. Note that with the plate heat exchangers the power leads exit from the top of the plates. Refer to the figure 1. (ii) Note that the flat plate will have the minimum blockage effect upon the air stream and the pinned plate will have the maximum. Hence it will not be possible to achieve the same maximum air velocity reading (fan at full speed) with the pinned plate in position as with the flat plate in position. If direct comparison between finned, pinned and flat plate performance is required then it would be beneficial to test the pinned plate first in order to establish the maximum possible velocity reading U. Then the remaining plates can be tested under similar or lower air flow conditions. (iv) Switch on the main switch (1) and set air velocity to a low value by closing the air Throttle (9). Increase the heater power to a suitable level (e.g. 220 Volts) such that ts (T1) does not exceed 100°C. Allow the temperatures to stabilize and then record the surface temperature ts (T1), the heater supply voltage V, heater current I and the air velocity U. (v) Maintain the heater voltage at the same condition and then increase the air velocity by opening the air throttle (9). Once again allow the temperatures to stabilize and repeat the readings. Repeat the procedure at increasing air velocity if required. (vi) For direct comparison repeat the procedure for the three plates under similar heat input conditions and at similar velocities.
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