Transcript
Data Recorder
Table 1: Run 1
Blower Voltage (V)
Steam Pressure (psi)
Mass Flowrate of air (lb/s)
Steady Air Temperature (oF)
Number of Tubes Inlet Temperature (Tc,i) Outlet Temperature (Tc,o)
4
6
8
10
12
Table 2: Run 2
Blower Voltage (V)
Steam Pressure (psi)
Mass Flowrate of air (lb/s)
Steady Air Temperature (oF)
Number of Tubes Inlet Temperature (Tc,i) Outlet Temperature (Tc,o)
4
6
8
10
12
Table 3: Run 3
Blower Voltage (V)
Steam Pressure,
Mass Flowrate of air (lb/s)
Steady Air Temperature (oF)
Number of Tubes Inlet Temperature (Tc,i) Outlet Temperature (Tc,o)
4
6
8
10
12
Table 4: Run 4
Blower Voltage (V)
Steam Pressure (psi)
Mass Flowrate of air (lb/s)
Steady Air Temperature (oF)
Number of Tubes Inlet Temperature (Tc,i) Outlet Temperature (Tc,o)
4
6
8
10
12
Sample Calculation to be used in Experiment
The following hypothetical table of results were used in the sample calculations:
Blower Voltage (V) 100
Steam Pressure (psi) 40
Mass Flowrate of air (lb/s) 1500
Steady Air Temperature (oF)
Number of Tubes Inlet Temperature (Tc,i) Outlet Temperature (Tc,o)
2 23
50
Determination of heat transfer coefficient of air
Note: For calculations, units have been changed to SI units.
Therefore,
Surface Area of Tubes:
Given: heating area per bank – 9.87 ft2
There are seven tubes per bank; therefore, area per tube is 1.41 ft2 = 0.131m2
Area = (4 tubes) x (0.131m2/tube)
= 0.524 m2
Thus,
