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Energy Balance on Steam Boiler

The spreadsheet documentation for calculate Energy Balance on Steam Boiler 

Michael Hutapea

7 Maret 2015Aisyah ani

 !ursyaniati

Data Entry Purpose of Result

Temperature inlet 1"#$$

%elocity inlet 1#52 m&s

'ressure inlet 1$7#( )'a

Temperature outlet 1*"#(

'ressure outlet 1$7#( )'a

%elocity outlet (#1* m&s

Height 15#2 m+atum Height 0 m

,ra-ity g (#"0..

/inetic energy 1 1 1#1552 &/g

/inetic energy 2 2 *1#7.(" &/g

Entalphy saturated $ 7.#(.1. /&/g

Entalphy unsaturated * 27"0#"(( /&/g

'otential energy pe 5 1*(#0.0$2 &/g

Entalphy H . 270$($7*00 &/gHeat Q 7 270393759!"7#9 $%&g

Process 'lo( Diagram

T1

34

Heat 6 is 270$($75(0 must 8e added per )ilogramof steam# Heat calculated 8y spreadsheet e9uation 7#

amount of gra-ity multiplied 8y height plus 8y ΔHand )inetic energy in change

-1

'1

T2

34

'2

-2

:2

z1

m&s2

)e1

)e2

H1

H2

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;nterpolation Saturated Steam +ata ;nterpolation

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Sprea)s*eet E+uation Sprea)s*eet E+uation Purpo

1 )e1 e9uation is )ynetic inlet# )e1 calculated =ith -elocit

2 )e2 e9uation is )ynetic outlet# )e2 calculated =ith -el

$

*

5 pe is potential energy# pe calculated =ith multiplied h

.

7

,nstruction-

H1 is enthalpy temperatur inlet T1# H1 calculated 8steam

H2 is enthalpy temperatur outlet T2# H2 calculated 8ysteam

>H is change in enthalpy# >H calculated 8y H2

6 is heat must 8e added per )g mass of steam# 6 calculmultiplied 8y gra-ity plus >H plus

"ke2 "= 〖

2 〗̂ 2/2

"ke1 "= 〖1 〗̂ 2/2

  1 + 1 )∗ ( ))/= ( − (−

( ))(−

  1 2= ∗

∆  2 1= − 

= 2 1) +(ke2−ke1)+( − ∗ ∆  

  2 + 2 )∗ ( ))/

= ( − (−( ))(−

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?ater enters a 8oiler at 1"@4 and 1$7#( )'a through at an a-erage

 -elocity of 1#52 m&s# eit steam at a height of 15#2 m a8o-e the li9uid inlet

lea-es at 1$7#( )'a 1*"#(@4 and (#1* m&s in the outlite line# Setting

C D1 for tur8ulen flo= and ?s D 0 no e)sternal =or) ta)ing the datum

height :1 at point 1#

.anual /perations-

1# calculate )e1 and )e2 =ith spreadsheet e9uation num8er 1 and 2#

2# calculate entalphy saturated and entahlphy unsaturated =ith e9uation $ and *

$# calculate H and potential energy =ith e9uation . and 7

*# use e9uation 7 for calculate heat per )g mass

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  e

  inlet s9uared di-ide 8y 2

  city s9uared di-ide 8y 2

  ight :2 8y gra-ity g

  interpolation saturated

interpolation unsaturated

minus H1

  ated 8y amount of height>)e

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