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FAN KANUNLARI

M

evcut bir fan›n fiziksel ölçülerini de¤ifltirmeden,
devrini de¤ifltirdi¤imizde ayn› fan›n debi, bas›nç,
güç, verim ve ses seviyesindeki de¤iflimleri gösteren
denklemler fan kanunlar› olarak adland›r›l›r. Afla¤›daki
örne¤i hep birlikte inceleyecek olursak debi, bas›nç,
güç, verim ve ses seviyesi aras›ndaki iliflkiyi görebiliriz.
Devir say›s›ndaki de¤iflim örnek olarak, motor h›z› düflük
devirde 1440 devir/dakika (4 kutuplu motor), yüksek
devirde 2880 devir/dakika (2 kutuplu motor) olarak
al›nm›flt›r.

1. Fan›n debisi (Q), devir say›s›ndaki (N) de¤iflim
oran›yla do¤ru orant›l› olarak de¤iflir.

3. Güç(W), devir say›s›ndaki de¤iflimin küpüyle do¤ru
orant›l› olarak de¤iflir.

N2 3 W2
(-------- ) = ----W1
N1
2880 3
W2
(---------) = ----1440
W1
W 2 = 8 x W1
Devir say›s› iki kat artt›¤›nda, fan tahrik gücü sekiz kat artar.

N2
Q2
----- = ----N1
Q1

2880 Q2
----- = ----Q1
1440

4. Verim (η), devir say›s›n›n de¤iflmesiyle de¤iflmez
ayn› kal›r.

Q2 = 2 x Q 1

η1 =

Devir say›s› iki kat artt›¤›nda, fan›n debisi iki kat artar.

2. Bas›nç(P), devir say›s›ndaki de¤iflimin karesiyle
do¤ru orant›l› olarak de¤iflir.

N2
P2
2
(--------) = ----N1
P1
P2
2880 2
(--------- ) = ----1440
P1

Q1 .P1
------W1

Q2 .P2 (2.Q 1 ) .(4.P 1 )
Q1 .P1
η2 = ------- = ----------------- = ------- =
W1
W2
8.W 1

5. Ses seviyesindeki (S) de¤iflim, devir say›s›ndaki de¤iflime
ba¤l› olarak afla¤›daki formüle göre hesaplan›r:

N2
S 2 = S 1 + 50 . log 10 -----N1
2880
S 2 = S 1 + 50 . log 10 ------1440

P 2 = 4 x P1
S 2 = S 1 + 15 dB
Devir say›s› iki kat artt›¤›nda, fan›n debisi iki kat artar.

η1

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Fan kanunlari

  • 1. FAN KANUNLARI M evcut bir fan›n fiziksel ölçülerini de¤ifltirmeden, devrini de¤ifltirdi¤imizde ayn› fan›n debi, bas›nç, güç, verim ve ses seviyesindeki de¤iflimleri gösteren denklemler fan kanunlar› olarak adland›r›l›r. Afla¤›daki örne¤i hep birlikte inceleyecek olursak debi, bas›nç, güç, verim ve ses seviyesi aras›ndaki iliflkiyi görebiliriz. Devir say›s›ndaki de¤iflim örnek olarak, motor h›z› düflük devirde 1440 devir/dakika (4 kutuplu motor), yüksek devirde 2880 devir/dakika (2 kutuplu motor) olarak al›nm›flt›r. 1. Fan›n debisi (Q), devir say›s›ndaki (N) de¤iflim oran›yla do¤ru orant›l› olarak de¤iflir. 3. Güç(W), devir say›s›ndaki de¤iflimin küpüyle do¤ru orant›l› olarak de¤iflir. N2 3 W2 (-------- ) = ----W1 N1 2880 3 W2 (---------) = ----1440 W1 W 2 = 8 x W1 Devir say›s› iki kat artt›¤›nda, fan tahrik gücü sekiz kat artar. N2 Q2 ----- = ----N1 Q1 2880 Q2 ----- = ----Q1 1440 4. Verim (η), devir say›s›n›n de¤iflmesiyle de¤iflmez ayn› kal›r. Q2 = 2 x Q 1 η1 = Devir say›s› iki kat artt›¤›nda, fan›n debisi iki kat artar. 2. Bas›nç(P), devir say›s›ndaki de¤iflimin karesiyle do¤ru orant›l› olarak de¤iflir. N2 P2 2 (--------) = ----N1 P1 P2 2880 2 (--------- ) = ----1440 P1 Q1 .P1 ------W1 Q2 .P2 (2.Q 1 ) .(4.P 1 ) Q1 .P1 η2 = ------- = ----------------- = ------- = W1 W2 8.W 1 5. Ses seviyesindeki (S) de¤iflim, devir say›s›ndaki de¤iflime ba¤l› olarak afla¤›daki formüle göre hesaplan›r: N2 S 2 = S 1 + 50 . log 10 -----N1 2880 S 2 = S 1 + 50 . log 10 ------1440 P 2 = 4 x P1 S 2 = S 1 + 15 dB Devir say›s› iki kat artt›¤›nda, fan›n debisi iki kat artar. η1