Flow noise on the volume flow controller with integrated Venturi tube according to DIN EN ISO 5167-1

 

 

 

DN
(mm)

 

 

 

w
(m/s)

 

 

 

V
(m3/h)

Δpg = 100 Pa

 

 

 

LWA
dB(A)

LW (dB/octave)

fm (Hz)

63

125

250

500

1000

2000

4000

8000

315

2

550

45

40

43

46

42

39

34

31

47

4

1080

51

46

46

51

46

43

36

31

52

6

1610

54

50

49

54

50

47

40

33

55

8

2125

55

56

55

59

55

52

46

37

60

10

2700

64

59

59

65

59

56

51

43

65

 

 

 

 

DN
(mm)

 

 

 

w
(m/s)

 

 

 

V
(m3/h)

Δpg = 250 Pa

 

 

 

LWA
dB(A)

LW (dB/octave)

fm (Hz)

63

125

250

500

1000

2000

4000

8000

200

2

210

47

46

52

54

51

49

48

46

56

4

420

52

49

50

54

53

50

46

40

57

6

650

53

53

51

54

55

52

50

55

59

8

850

55

55

54

56

56

53

51

52

60

9

1055

58

56

55

57

58

55

51

44

61

250

2

345

46

42

45

46

42

38

33

31

47

4

670

51

45

44

49

48

45

40

33

52

6

1020

57

49

46

51

48

44

37

33

53

8

1350

64

50

46

50

47

43

44

48

54

9

1515

54

48

44

50

51

45

46

49

55

315

2

550

49

48

51

55

53

54

49

42

59

4

1080

56

54

54

58

56

53

49

41

60

6

1610

61

58

57

62

58

56

51

42

63

8

2125

65

61

60

65

60

58

52

44

66

10

2700

68

64

63

67

63

61

55

47

68

 

 

 

 

DN
(mm)

 

 

 

w
(m/s)

 

 

 

V
(m3/h)

Δpg = 500 Pa

 

 

 

LWA
dB(A)

LW (dB/octave)

fm (Hz)

63

125

250

500

1000

2000

4000

8000

315

2

550

57

49

55

63

62

62

66

60

70

4

1080

60

57

59

65

63

62

58

52

68

6

1610

68

62

62

66

64

63

59

52

69

8

2125

68

65

66

70

66

64

60

53

71

10

2700

71

68

68

72

68

66

61

54

73

fm

Mid frequency of the octave band

LW

Sound power level determined in reverberation chamber

LWA

Total sound level, A-evaluated

Δpg

Total pressure difference (measured upstream and downstream from the volume flow controller)

V

Volume flow

w

Flow velocity