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1- (Fan) :

Variable Constant No. Law Formula

Speed

Air density - Fan size - Distribution

system

1 Capacity varies as the speed. Q1/Q2 = N1/N2

2 Pressure varies as the square of

the speed. P1/P2 = (N1/N2)2

3 Horsepower varies as the

cube of speed. HP1/HP2 = (N1/N2)3

Fan size

Air density Tip speed

4

Capacity and Horsepower vary as the

square of the Fan size.

Q1/Q2 = HP1/HP2 = (D1/D2)2

5 Speed varies

inversely as the Fan size.

N1/N2 = D2/D1

6 Pressure remains constant.

P1 = P2

Air density - Speed

7 Capacity varies as the cube of

the Size. Q1/Q2 = (D1/D2)3

8 Pressure varies as the square of

the Size. P1/P2 = (D1/D2)2

9

Horsepower varies as the fifth power of

the Size.

HP1/HP2 = (D1/D2)5

Air density

Pressure - Fan size -

Distribution system

10

Speed , Capacity and Horsepower

vary inversely as the square

root of Density.

N1/N2 = Q1/Q2 = HP1/HP2 = (W2/W1)1/2

Capacity - Fan size -

Distribution system

11

Pressure and Horsepower vary as the

Density.

P1/P2 = HP1/HP2 = W1/W2

12 Speed remains constant. N1 = N2

4egaP

: -2 0005/Q=MPG

)rh/utB( : Q

: -3

RT*]RT/MPG[ 3=MPG

: RT

: -4 + + + )001/5.2*5.1*l(=L

: )tf( L : )tf( l tf 5 = tf 01 = ( ) tf 52 =

: - 5

L= )001/5.2*5.1*1(+ + + +

: )tf( L : )tf( l tf 5= ( ) tf 52= ( ) tf 03=

: -6

T.A.U=Q

.. : )rh/utB( Q : )Fo.2tf.rh/utB( U

: )2tf( A : )Fo( T

5egaP

: -7 )RT(= rh/utB 00021

rh/lacK = 4 / rh/utB MPG = 4.4 * rh/3M

tiL = 587.3 * snollaG rh/3M = 6.0 / MFC wK = 537.0 * PH

sttaW = 78292.0 * rh/utB

: - 8 ( ) H/Q20.0=A ( ) H/Q40.0=A

: )2mc( A

: )rh/lacK( Q 2h5.0 + 1h = )m( H

: 1h : 2h

004 : .

: -9

0004 / RT = )tiL(V

: RT

: - 01 )0004/RT( 5.1 + 51 = )mm( d

: RT

4/11:

: -11 ( = )tiL( VQ 0001 / )5.1 *

: )rh/lacK( Q

4/11:

6egaP

: -21 ( ) 0001/Q( 5.1 + 51 = )mm( 1d

( ) 0001/Q( + 51 = )mm( 2d

: )rh/lacK( Q

: -31 n * N * 4 * HPG = )tiL( V

: HPG

( 02 ) : N ( 54 ) : n

: 14

. isp 02 rh/bl 02~81

: -15 rh/bl * 200.0 = MPG

: rh/bl

: -16

T*005*MPG=Q

.. : )rh/utB( Q : MPG

: )Fo( T

: -71 T *80.1*MFC=Q

.. : )rh/utB( Q

: MFC : )Fo( T

7egaP

: -81 m(V[ = )rh/lacK(Q3 42 / )C42(*0001*]rh-)C4: m(V[ = )rh/lacK(Q3C82(*0001*]rh 42 / )-)C4:

: )rh/lacK( Q

: )3m(V

: -91 4.4 * ]rh 6 / )3m(V[ = MPG

: )3m(V

: -02 . 21

: -12

gisp 51 : erusserp woL gisp 06 : erusserp muideM

gisp 051~001 : erusserp hgiH

: -22 s/m 3~5.1 : retaW

s/m 02 : maetS s/m 02 : epip ni riA

nim/tf 0501 : )lairtsudni( tcud ni riA nim/tf 009 : )lairtsudni non( tcud ni riA

nim/tf 057 : stcud tsuahxe ro nruter ni riA nim/tf 005 : slioc hguort gnissap riA

nim/tf 003 : sllirg ylppus dna sresuffid morf gnissap riA nim/tf 002 : sllirg tsuahxe morf gnissap riA

: -32

2 =12 + 22 + 32 + i : i

8egaP

: -24 m(30059 / )rh/lacK( Q = )rh/ : m(300062 / )rh/lacK( Q = )rh/ :

: )rh/3m(

: )rh/lacK( Q

: -25 Q A = )rh/lacK( m(2051 . )

: -26

m( A = )RT( Q252 / )

: -72 Q = N ( 521 / )rh/lacK()ro

Q = N 005 / )rh/utB( : N

.. : )rh/utB( ro )rh/lacK( Q

: -82 57.0 * N = n

: n 72 : N

: -92

4 / N * ]8.4 * 63 * )H*W*L([ = )rh/lacK( Q

: H*W*L : N

: -03

. 081

9egaP

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