Perhitungan+Perpindahan+Panas+Konveksi+pada+Air+

•! Laju%massa%air%!"#$ = &!'("$"&)*+∆- "#$ = & )*+∆- '("$"&)*+∆- "#$ = & ./0*+∆- '("$"&

)"#$& = &0,5&45

6%

%•! Kecepatan%air%panas%pada%pipa%

)"#$ = &./0"#$&

0"#$ = &)"#$

./= 71,68&

)

6%

%•! Diameter%Hidrolik%

%%% ;< = &

=<>

?(<A>)= 1,95&D&10E=%

%%%%%

•! Bilangan%Reynold%

FG = &.0;HI

= &(1000). (71,68). (2,98. 10EL)

0,28. 10EL= 762880&(/MNOPQ&-ROSRMGQ)%

%•! Bilangan%Nusselt%untuk%aliran%turbulen%

TR = 0,023&D&FGV,W&D&XOV,L = 1372,54%%

•! Koefisien%perpindahan%panas%konveksi%air%

ℎ"#$ = &TR&D&4

;<= 286,6&

4[

)?\&%

%

Perhitungan+Perpindahan+Panas+Konveksi+pada+Udara+

•! Cross%Sectional%Flow%Area%

]N = &[. ℎ>[ + 6

&D&_

S` + &S?= &0,06355&)?%

%

•! Bilangan%Reynold%

FG = &.0;HI

= 106,42%

S%=%0,1%mm%

h%=%4%mm%

%•! Nilai%j%(j%:%korelasi%antara%Reynold%dan%Nusselt)%

a = 0,64&D&FGEV,?W = &0,173%%

•! Bilangan%Nusselt%TR'("$" = a&D&FG&D&XOV,L = 16,5&%

%•! Koefisien%perpindahan%panas%konveksi%udara%

ℎ'("$" = &TR&D&4

;<= 2225,38&

[

)?\%

%

Perhitungan+Hambatan+Panas+Total+

+

%

%

%

%

%

%

%

%

%

%

•! Hambatan%Konveksi%Udara%(R”udara)%

F"'("$" = &1

ℎ'("$"= 4,493&D&10E= &

)?\

[&%

%•! Hambatan%Konduksi%Pipa%(R”pipa)%

F"c#c" = &MQO?O

2d4e= &8,829&D&10EL &

)?\

[%

%•! Hambatan%Konveksi%Air%(R”air)%

F""#$ = &1

ℎ"#$&D&eRP6&XGQP)+PQ5&/NO

eRP6&XGQP)+PQ5&fgPOP

= 2,01D&10Eh &)?\

[%

%

Air%

Udara%

Tu%

Ta%

Rkonveksi%udara%

Rkonveksi%air%

Rkonduksi%pipa%

•! Koefisien%Perpindahan%Panas%Total%

f = &1

Fiji"k&

f = &1

Fljmnol>#PNO + &Fljm('l>#+N+P +&Fljmnol>#RgPOP&= &107,77&

[

)?\%

%+Besar+Perpindahan+Panas+pada+Radiator+

! = f. /. p. eq-; = 107,77 . 6,5 . 59,46 = 41,65&4[%+Hasil%Perhitungan%dibandingkan%dengan%spesifikasi%mesin%untuk%kondisi%operasinya%:%

!$"(#"ij$& = &0,35

0,5&D&68 = 40,8&4[%