OBJECTIVE
Determine the performance curve of a fanduct system and evaluate the pressure loss associated with flow through a screen as a function of screen mesh density. Compare these measurements with handbook data.
RESULTS
Values of Cs, V and P screen and their uncertainties for all of the screen(s)filter(s)
The reported values indicate that there is a loss of efficiency in the air flow when a screen is attached to the duct, and the loss increases as the screen thickness increases. The different mesh sizes also had different air flow rate values. When air flow was measured in water, the value also dropped indicating greater loss of efficiency.
Comparison plot of Cs vs. ff for the measured data and the two predictions.
The laboratory values of Cs for the window and the 12, 14 and 18 mesh screens were lower than the predicted values in the tables. The ff values for the given variables closely resembled that of the predicted values.
Compare the jet exit velocity profiles measured with and without one of the screens
Jet exit Velocity without filter
The jet velocity profiles were higher for those when there was no air filter across all duct measurements. The difference was significantly high, which means that using an air filter reduces air flow.
Fanduct performance curve, i.e. Q vs. , for the apparatus
The fanduct performance curve showed that the fan system increased the pressure while the duct system decreased the pressure. The fan performance curve can be characterized as a fan curve while the duct performance was more of a system curve.
The efficiency of air flow from a fan can be assumed only to be 100 percent efficient, in reality, there will be minor variations without the use of a screen or filter. However, when there is screensfilter, the loss of efficiency becomes greater. On the other hand, the use of a fan system is likely to increase the pressure in the air flow, while a duct system is likely to decrease that pressure
Determine the performance curve of a fanduct system and evaluate the pressure loss associated with flow through a screen as a function of screen mesh density. Compare these measurements with handbook data.
RESULTS
Values of Cs, V and P screen and their uncertainties for all of the screen(s)filter(s)
The reported values indicate that there is a loss of efficiency in the air flow when a screen is attached to the duct, and the loss increases as the screen thickness increases. The different mesh sizes also had different air flow rate values. When air flow was measured in water, the value also dropped indicating greater loss of efficiency.
Comparison plot of Cs vs. ff for the measured data and the two predictions.
The laboratory values of Cs for the window and the 12, 14 and 18 mesh screens were lower than the predicted values in the tables. The ff values for the given variables closely resembled that of the predicted values.
Compare the jet exit velocity profiles measured with and without one of the screens
Jet exit Velocity without filter
The jet velocity profiles were higher for those when there was no air filter across all duct measurements. The difference was significantly high, which means that using an air filter reduces air flow.
Fanduct performance curve, i.e. Q vs. , for the apparatus
The fanduct performance curve showed that the fan system increased the pressure while the duct system decreased the pressure. The fan performance curve can be characterized as a fan curve while the duct performance was more of a system curve.
The efficiency of air flow from a fan can be assumed only to be 100 percent efficient, in reality, there will be minor variations without the use of a screen or filter. However, when there is screensfilter, the loss of efficiency becomes greater. On the other hand, the use of a fan system is likely to increase the pressure in the air flow, while a duct system is likely to decrease that pressure
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