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LAMPIRAN A PERHITUNGAN A.1

Konduksi Panas pada Aliran Linear

A.1.1 Bahan Brass 13 mm a. Nilai Perpindahan Panas (Q) 𝑄 =𝑉×𝐼 𝑄 = 6 𝑉 Γ— 0,0004 𝐴 𝑄 = 0,0024 π‘Šπ‘Žπ‘‘π‘‘ b. LuasPermukaan (A) πœ‹π· 2 3,14 Γ— (0,013)2 𝐴= = = 1,326 Γ— 10βˆ’4 π‘š2 4 4 c. TemperaturPanas (Thot) T8 = 19⁰C; T6 = 17⁰C π‘‡β„Žπ‘œπ‘‘ =

𝑇8 + (𝑇8 βˆ’ 𝑇6 ) 190 𝐢 + (190 𝐢 βˆ’ 170 𝐢) = = 10,50 𝐢 2 2

d. TemperaturDingin (Tcold) T3 = 14⁰C; T1 = 12⁰C π‘‡π‘π‘œπ‘™π‘‘ =

𝑇3 + (𝑇3 βˆ’ 𝑇1 ) 140 𝐢 + (140 𝐢 βˆ’ 120 𝐢) = = 80 𝐢 2 2

e. TemperaturIntermediet (Tint) 𝑇𝑖𝑛𝑑 = π‘‡β„Žπ‘œπ‘‘ βˆ’ π‘‡π‘π‘œπ‘™π‘‘ = 10,50 𝐢 βˆ’ 80 𝐢 = 2,50 𝐢 f. KonduktivitasTermal (k) ο‚·

ο‚·

KonduktivitasTermalPanas (khot); βˆ†xhot = 0,03 m π‘˜β„Žπ‘œπ‘‘ =

π‘„βˆ†π‘₯ 𝐴(𝑇8 βˆ’ 𝑇6 )

π‘˜β„Žπ‘œπ‘‘ =

0,0024 π‘Š Γ— 0,03 π‘š = 0,271 π‘Š/π‘šβ°πΆ 1,326 Γ— 10βˆ’4 π‘š2 ( 19⁰C βˆ’ 17⁰C)

KonduktivitasTermalDingin (kcold); βˆ†xcold = 0,03 m π‘˜π‘π‘œπ‘™π‘‘ =

π‘„βˆ†π‘₯ 𝐴(𝑇3 βˆ’ 𝑇1 )

π‘˜π‘π‘œπ‘™π‘‘ =

0,0024 π‘Š Γ— 0,03 π‘š = 0,217 π‘Š/π‘šβ°πΆ 1,326 Γ— 10βˆ’4 π‘š2 ( 14⁰C βˆ’ 12⁰C)

ο‚·

ο‚·

KonduktivitasTermalIntermediet (kint); βˆ†xint = 0,03 m π‘˜π‘–π‘›π‘‘ =

π‘„βˆ†π‘₯ 𝐴𝑇𝑖𝑛𝑑

π‘˜π‘–π‘›π‘‘ =

0,0024 π‘Š Γ— 0,03 π‘š = 0,217 π‘Š/π‘šβ°πΆ (1,326 Γ— 10βˆ’4 π‘š2 )( 2,5⁰C)

KonduktivitasTermalPercobaan (kper) π‘˜π‘π‘’π‘Ÿ =

π‘˜β„Žπ‘œπ‘‘ + π‘˜π‘π‘œπ‘™π‘‘ + π‘˜π‘–π‘›π‘‘ 3 π‘Š

π‘˜π‘π‘’π‘Ÿ =

π‘Š

π‘Š

0,0217 π‘š0 𝐢 + 0,217 π‘š0 𝐢 + 0,217 π‘š0 𝐢 3

= 0,217

π‘Š π‘š0 𝐢

g. Persentase Error (%) π‘˜π‘™π‘–π‘‘ βˆ’ π‘˜π‘π‘’π‘Ÿ πΈπ‘Ÿπ‘Ÿπ‘œπ‘Ÿ = | | Γ— 100% π‘˜π‘™π‘–π‘‘ 130 βˆ’ 0,217 πΈπ‘Ÿπ‘Ÿπ‘œπ‘Ÿ = | | Γ— 100% = 99,8% 130 h. Menghitung T4dan T5 𝑇4 = (

π‘„βˆ†π‘₯ ) + 𝑇3 π΄π‘˜π‘π‘’π‘Ÿ

0,0024 π‘Š Γ— 0,015 π‘š 0 𝑇4 = ( π‘Š ) + 14 𝐢 1,326 Γ— 10βˆ’4 π‘š2 Γ— 0,217 π‘š0 𝐢 𝑇4 = 15⁰𝐢 dan 𝑇5 = 𝑇6 βˆ’ (

π‘„βˆ†π‘₯ ) π΄π‘˜π‘π‘’π‘Ÿ

0,0024 π‘Š Γ— 0,015 π‘š 𝑇5 = 170 𝐢 βˆ’ ( π‘Š ) 1,326 Γ— 10βˆ’4 π‘š2 Γ— 0,217 π‘š0 𝐢 𝑇5 = 16⁰𝐢 A.1.2 Perhitungan untuk variasi tegangan pada alumunium 25 mm dan stainless steel 25 mm dilakukan dengan cara yang sama sepeerti diatas.

A.2

Konduksi Panas Pada Aliran Radial

A.2.1 Bahan Brass 25 mm pada Tegangan 6 V a. Nilai Perpindahan Panas 𝑄 =𝑉×𝐼 𝑄 = 6 𝑉 Γ— 0,0004 𝐴 𝑄 = 0,0024 π‘Šπ‘Žπ‘‘π‘‘ b. LuasPermukaan (A) 𝐴=

πœ‹π· 2 3,14 Γ— (0,025)2 = = 4,906 Γ— 10βˆ’4 π‘š2 4 4

c. KonduktivitasTermal (kper) r1 = 0,007 m

r5 = 0,04 m

r2 = 0,01 m

r6 = 0,05 m

r3 = 0,02 m

r7 = 0,06 m

r4 = 0,03 m

r8 = 0,07 m

π‘˜π‘π‘’π‘Ÿ

π‘Ÿ 𝑄 Γ— 𝑙𝑛( 8β„π‘Ÿ1 ) = 𝐴 (𝑇8 βˆ’ 𝑇1 )

π‘˜π‘π‘’π‘Ÿ =

0,0024 π‘Š Γ— ln (0,07 π‘šβ„0,007 π‘š) 4,906 Γ— 10βˆ’4 π‘š2 (210 𝐢 βˆ’ 16⁰𝐢)

= 9,78 π‘Šβ„ π‘šβ°πΆ

d. Persentase Error (%) π‘˜π‘™π‘–π‘‘ βˆ’ π‘˜π‘π‘’π‘Ÿ πΈπ‘Ÿπ‘Ÿπ‘œπ‘Ÿ = | | Γ— 100% π‘˜π‘™π‘–π‘‘ 130 βˆ’ 9,78 πΈπ‘Ÿπ‘Ÿπ‘œπ‘Ÿ = | | Γ— 100% = 92,4% 130 e. Menghitung T4 dan T5 π‘Ÿ 𝑄 Γ— 𝑙𝑛( 5β„π‘Ÿ4 ) 𝑇4 = ( ) + 𝑇3 𝐴 Γ— π‘˜π‘π‘’π‘Ÿ 0,0024 π‘Š Γ— 𝑙𝑛 (0,04 π‘šβ„0,03 π‘š)

𝑇4 = ( ) + 17⁰𝐢 4,906 Γ— 10βˆ’4 π‘š2 Γ— 0,962 π‘Šβ„ π‘šβ°πΆ 𝑇4 = 17,8⁰𝐢 dan

π‘Ÿ 𝑄 Γ— 𝑙𝑛( 6β„π‘Ÿ5 ) 𝑇6 = ( ) + 𝑇5 𝐴 Γ— π‘˜π‘π‘’π‘Ÿ 0,0024 π‘Š Γ— 𝑙𝑛 (0,05 π‘šβ„0,04 π‘š)

𝑇7 = ( ) + 18⁰𝐢 4,906 Γ— 10βˆ’4 π‘š2 Γ— 09,78 π‘Šβ„ π‘šβ°πΆ 𝑇4 = 18,4⁰𝐢 A.2.2 Perhitungan untuk variasi tegangan pada brass 25 mm dilakukan dengan cara yang sama sepeerti diatas.

LAMPIRAN B DOKUMENTASI

Gambar B.1 Power

Gambar B.2 HT12 Radial Heat Conduction Accessory

Gambar B.3 HT12 Linear Heat Conduction Accessory

Gambar B.4 Pengukuran Suhu

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