Air recirculation through a duct-room system assignment

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Reference no: EM132965999

Assignment - Air recirculation through a duct-room system

Assignment details

Conduct Test A and B following the instruction and perform the following analysis and write a minimum 2500-word comprehensive report. In the following questions, heat loss means heat loss per unit time (in Watts or W).

(1) In the report you need to explain how the values, including the heat flow rates and heat losses, are calculated. The formulae and theory must be given. Only showing the results is not satisfactory.

(2) In test A
o Calculate the heat loss between T2 and T4 and the heat loss between T4 and T5 (see Figure 1 for the positions of T1 - T5) for all the tests;
o Calculate the heat supplied by the preheater;
o Discuss how these heat losses are affected by temperature T2;
o Compare the total heat loss with the heat supplied.
o Analysis the results and discuss how the preheater power affect the temperatures and heat losses.
o When the preheater power is constant and fan speed varies, discuss the effect of the mass flow rate on the temperatures and heat loss.

(3) In test B
o For all the tests, calculate the heat supplied by the preheater, the heat loss between T5 and T1, heat loss between T4 and T5 and the total heat loss through the whole route T2- T3-T4-T5-T1;
o Compare the total heat loss with the heat supplied by the preheater;
o Discuss how these heat losses are affected by the temperature T2.
o Dicsucs how the temperature and heat are affected by the mass flow rate and preheater power.
(4) Compare the temperatures and heat losses in Test A with those in Test B and analyze the reason for the difference. (10% marks)

Test A
In test A, air enters the duct through inlet louvre and exit through the outlet louvre. The system is not a recirculated system. Before the air enters the room, it is heated by the preheater.
• Inlet Louver fully open; outlet louvre fully open, recycle louvre fully close.
• Set the fan speed to (50+n)%, and set the preheater control to (20+2n)%. Wait until the temperatures are stabilized (you do not need to wait if you use excel file to generate the data). Record the temperatures and the flow velocities. Keep the fan speed unchanged, repeat the tests for (30+2n)%, (40+2n)%, (50+2n)%, (60+2n)%, (70+2n)% and (80+2n)%.
• Set the preheater control to (40+2n)% and keep it constant, change the fan speed to from (30+n)% to (90+n)% with an increament of 10%. For each fan speed, record the temperatures and flow velocities.
Note: The temperatures will be stabilized very slowly in thphysical tests. You must ensure they are stabilized before you record the data. If you use the excel file to generate the data, the temperature are stabilized temperature immediately after you set up the input data.

Test B
In test B, the air flows through a recirculation duct.
(1) Close the Inlet Louvre and outlet Louvre, open Recycle Louvre fully. The system becomes an air recirculation system. Set the fan speed to (50+n)% amd keep it constant. Set the preheater control to (20+n)% to (90+n)%, with an interval of 10%. For each preheater power, record the temperatures and flow velocities.
(2) The system is still a air recirculation system. Set the preheater control to (40+2n)% and keep it constant. Change the fan speed to from (30+n)% to (90+n)% with an increament of 10%. For each fan speed, record the temperatures and flow velocities.

Attachment:- Duct-room system.rar

Reference no: EM132965999

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