FD Fan Efficiency Calculation

Efectivene Efect iveness ss o heat mass mass rate rate in diese diesell burne burne Given: Quantity of diesel 50 l/hr NCV of diesel 8300Kcal/hr Volume of air supplied by FD fan !300 cfm  &emperature  &emperature of air inlet #5'C  &emperature  &emperature of air outlet !(0'C )&*+ , Heat required to heat 9000m^!hr air "#:

!08"#$# m%3/hr

-.Q/Cp47& -.air o in m%3/sec Q.heat re1uired in K2 Cp.speci@c heat capacity of air in K:/K6'C 4.density of air in 6/m%3  7&.dierence in temperature

5$#8 $m^!hr%0&000'( !08"##0$000 *  $0 0 5 5$#8m%3/h  $! 95

-.Q/C>47& + + + + + +

% % % % % %

5$#0$#8$!95 3 ( 9 $0 " ! K:/sec 3 ( 9 $0 " ! K 3(9$0"!3900

$',-9', ./!hr '90 '901 1(&9 (&9 .cal!hr

K:/sec.K2 Kcal.($8K:/hr

23E4 ': Heat produced by the diesel in burner: Q . Q . Q . 3hermal = .

;massNCV< ;(38300< 35 9 "0 0 .cal!hr e5ciency o the burner: heat needed /heat used

500$89

(3

'901!-1900 =

6

.

%

0$835583

&-07

2tep : 3o nd heat required to remove -'1g o moisture per hour , mass to be remo>ed 5! 9  6 m -atent heat of ater !!5#K:/6 ?

+

+ %m8; % -'1&'8''-(

6 6

+%$$($' ./!hr Kcal/hr +%',99&' % heat needed !heat used !83(""/359"00 %

6

%

(9&,7

K:/hr.0$!388Kcal/hr

r in existing spraydryer

)^!sec !## r

0(9$808 "00!5($"

E5ciency calculation o <= an in radiator Ai>en, Bnlet air temperature, Density of inlet air Velocity of air at inlet  &otal poer consumed fan motor eciency pressure inside the radiator ducts rea of radiator inlet duct rea of radiator outlet duct

3!'C $5#K6/m%3 #$"m/s #5p #!$50E 80mmc 9(09(0 mm 80900 mm

)tep  Density of air at 3!'C, 4.;!#3$!"3
Density of

4.;!#3$!"3
E5ciency o an motor: Bf motor runs at

50 H 39$5H

00E eciency I I.#!$5E ecient runnin6

)tep3

>alculate area o ducts ;B<

9(09(0

;BB<

80900  &otal rea

0$(0"9 m! 0$(89 m! 0$8"5m

)tep (,

>alculate air "o# rate Q.V Q.0$8"5#$" Q . #$0#05 m%3/sec )tep 5,

4o#er inlet to shat K.=p K.0$#!5#50$#(5 K.(0$50

)tep 9,

>alculate e5ciency o the an: =.J;Volume in m3/sec<;total pressure in mmc</;0!poer input in shaft< mmc."$8pa

pa.0$0! mmc =.J;#$0#580
6%$7

air at 0'C is $!"3K6/m