The Effects of Debris Accumulation Upon Air Flow and Filter Resistance to Air Flow for Four Commercially Available Vacuum Cleaners

Table A4. Pressure losses and air flows through Tiger Vac vacuum cleaner 11/13/2007 Round 2

Before (B) or after (A) adding 5 pounds of debris

Total weight of debris transferred into vacuum cleaner (lb)

Venturi meter δP (inches of water)

Static Pressure Measurements made with manometer (inches of water)¹

Absolute pressure measured with pressure transducers (psi)

Time measuring before loading

Time measuring during loading

Air flow (cfm) from venturi meter

Pressure in the hose (inches of water)

Pressure before the filter (inches of water)

Pressure after the final filter (inches of water)

Pressure before the filter (psi) 53748

Pressure after the filter (psi) 55481

B

5.2

8.8

 -4.5

-4.9

-5.4

13.882

13.84

2:59pm

3:00pm

77.99

A

8.75

-4.3

-4.7

-5.6

13.89

13.824

77.77

B

10.4

8.7

 -4.15

-4.6

-5.25

13.89

13.84

3:05pm

3:07pm

77.55

A

8.65

-4.3

-4.6

-5.65

13.89

13.832

77.33

B

15.6

8.8

 -4.3

-4.6

-5.3

13.89

13.84

3:12pm

3:14pm

77.99

A

8.8

-4.25

-4.6

-5.6

13.882

 13.824

77.99

B

20.6

8.75

 -4.2

-4.6

-5.55

13.882

13.824

3:23pm

3:25pm

77.77

A

8.1

-4.2

-4.5

-5.8

13.882

 13.815

74.87

B

25.8

8.25

 -4.3

-4.5

-5.4

13.873

13.84

3:37pm

3:38pm

75.55

A

7.9

-4.5

-4.85

-6

13.865

13.815

73.95

B

31

8

 -4.3

-4.8

-5.5

13.865

13.815

3:43pm

3:46pm

74.41

A

 7.9

-4.35

-4.5

-5.75

13.865

 13.824

73.95

B

35.6

7.9

 -4.4

-4.8

-5.7

13.865

13.824

3:52pm

3:56pm

73.95

A

 8.4

-4.5

-4.8

-6.25

13.857

 13.807

76.22

Final

 35.6

8.2

-4.4

-4.8

-5.6

13.731

13.8

4:02pm

75.32

¹ Static pressure is the difference in pressure from atmospheric pressure. Negative static pressure indicates that pressure is less than atmospheric pressure.