BAB VI KESIMPULAN DAN SARAN
6.2. Saran
Adapun saran yang dapat diberi untuk kelanjutan penelitian ini adalah: 1. Mengganti susunan tabung menjadi belahketupat, segitiga, dan
segitiga yang diputar 30°. 2. Membuat variasi baffle cut. 3. Memvariasikan kecepatan fluida.
DAFTAR PUSTAKA
[1] Sitompul Tunggul M, Alat Penukar Kalor, edisi 1. cet. 1.PT.Raja Grafindo Persada, Jakarta (1993). Halaman 88.
[2] Ibid[2] Halaman 103.
[3] Holman, J.P, Perpindahan Kalor, Penerbit Erlangga, Jakarta (2000). Halaman 2.
[4] Yunus A. Cengel, Heat Transfer A Practical Approach, Second Edition, Mc Graw-Hill,Book Company, Inc, Singapore, (2003),
Halaman 26 [5] Ibid [3] Halaman 11. [6] Ibid [4] Halaman 460. [7] Ibid [3] Halaman 14. [8] Ibid [4] Halaman 562. [9] Ibid [1] Halaman 12-14. [10] Ibid [1] Halaman 17. [11] Ibid [1] Halaman 14. [12] Ibid [1] Halaman 39. [13] Ibid [1] Halaman 4. [14] Ibid [1] Halaman 17.
[15] Byrne C. Richard, Standards of Tubular Exchanger Manufacturers Association, Tubular Exchanger Manufacturers Association
[16] Thome, John R, Wolverine Engineering Databook III, Wolverine Inc., Lausanne (2010), Halaman3-2.
[17] Ibid [1] Halaman 43.
[18] Ibid [16] Bab 3 Halaman 37. [19] Ibid [1] Halaman 47.
[20] Ibid [1] Halaman 83. [21] Ibid [3] Halaman 48.
[22] Incropera, Frank P., David P. Dewitt, Fundamentals of Heat and Mass Transfer, second edition, John Wiley & Sons Inc., New York
(1985). Halaman 312. [23] Ibid [16] Halaman 3.8-3.13. [24] Ibid [16] Halaman 3-5. [25] Ibid [16] Halaman 3-13. [26] Ibid [1] Halaman 255.
[26] Pitts, R. Donald, Theory and Problems of Heat Transfer, second edition, McGraw Hill, New York (1997). Halaman 270.
[27] Ibid [3] Halaman 498-499 .
[28] Sharqawy, Mostafa H., John H. Lienhard V, Syed M. Zubair, Thermophysical Properties of Seawater, A Review of Existing
Correlations and Data, Desalination and Water Treatment, 2010.
[29] Ibid [22] Halaman 774. [30] Ibid [22] Halaman 755
SOURCE CODE (VISUAL BASIC 6.0)
1. Perhitungan awal dan perhitungan laju perpindahan panas.
Gambar L.1. Form1.frm.
Public Thi, Tho, Tci, mh, mc, d1, d2, Di, Pt, Nt, Lb, q, Pi, L, LMTD, hi, ho, P, R, F, De, numlnX
Public CpAir, MiuAir, kAir, PrAir, CpAirlaut, MiuAirlaut, kAirlaut, PrAirlaut, Rec, Reh
Private Sub Command1_Click() Thi = Val(Text3.Text)
Tho = Val(Text4.Text) mh = Val(Text5.Text)
TabelAir (Tho + Thi) / 2, Cph, Miuh, kh, Prh Label11.Caption = Cph
Label12.Caption = Format(Miuh, "0.#########") Label13.Caption = kh
Label14.Caption = Prh End Sub
Private Sub Command2_Click() Thi = Val(Text3.Text)
Tho = Val(Text4.Text) mh = Val(Text5.Text)
q = mh * Cph * (Thi - Tho) Label19.Caption = q End Sub
Private Sub Command3_Click() Form2.Show
End Sub
2. Perhitungan LMTD dan faktor koreksi.
Gambar L.2. Form2.frm.
Public Thi, Tho, Tci, mh, mc, d1, d2, Di, Pt, Nt, Lb, q, Pi, L, LMTD, hi, ho, P, R, F, De, numlnX
Public CpAir, MiuAir, kAir, PrAir, CpAirlaut, MiuAirlaut, kAirlaut, PrAirlaut, Rec, Reh
Private Sub Command1_Click() Form4.Show
End Sub
Private Sub Command2_Click() t = Val(Form4.Label10)
Label11.Caption = Cpc Label12.Caption = Format(Miuc, "0.#########") Label13.Caption = kc Label14.Caption = Prc Label22.Caption = Val(Form4.Label9) + 273 End Sub
Private Sub Command3_Click() Thi = Val(Form1.Text3.Text) + 273 Tho = Val(Form1.Text4.Text) + 273 Tci = Val(Form2.Text3.Text) + 273 Tco = Val(Form4.Label9) + 273
LMTD = ((Thi - Tco) - (Tho - Tci)) / (ln((Thi - Tco) / (Tho - Tci))) Label18.Caption = LMTD
End Sub
Private Sub Command4_Click() Thi = Val(Form1.Text3.Text) + 273 Tho = Val(Form1.Text4.Text) + 273 Tci = Val(Form2.Text3.Text) + 273 Tco = Val(Form4.Label9) + 273 P = (Tco - Tci) / (Thi - Tci) R = (Thi - Tho) / (Tco - Tci)
F = ((((R ^ 2) + 1) ^ 1 / 2) * (ln((1 - P) / (1 - (P * R))))) / ((R - 1) * ln((2 - (P * (R + 1 - (((R ^ 2) + 1) ^ 1 / 2)))) / (2 - (P * (R + 1 + (((R ^ 2) + 1) ^ 1 / 2))))))
Label19.Caption = F End Sub
Private Sub Command5_Click() Form3.Show
Private Sub Form_Load()
Label25.Caption = Val(Form1.Label19) End Sub
3. Perhitungan temperatur air laut keluar.
Gambar L.3. Form4.frm.
Public Thi, Tho, Tci, mh, mc, d1, d2, Di, Pt, Nt, Lb, q, Pi, L, LMTD, hi, ho, P, R, F, De, numlnX
Public CpAir, MiuAir, kAir, PrAir, CpAirlaut, MiuAirlaut, kAirlaut, PrAirlaut, Rec, Reh
Private Sub Command1_Click() Tci = Val(Form2.Text3.Text) mc = Val(Form2.Text5.Text) q = Val(Form1.Label19) Tsem = Val(Text1.Text)
TabelAirlaut Tsem, Cpc, Miuc, kc, Prc Tco = Tci + (q / (mc * Cpc))
t = (Tci + Tco) / 2
Label6.Caption = Form1.Label19 Label8.Caption = Cpc
Label9.Caption = Tco Label10.Caption = t End Sub
4. Perhitungan koefisien perpindahan panas menyeluruh dan panjang APK.
Gambar L.4. Form3.frm.
Public Thi, Tho, Tci, mh, mc, d1, d2, Di, Pt, Nt, Lb, q, Pi, L, LMTD, hi, ho, P, R, F, De, numlnX
Public CpAir, MiuAir, kAir, PrAir, CpAirlaut, MiuAirlaut, kAirlaut, PrAirlaut, Rec, Reh
Private Sub Command1_Click() d1 = Val(Text1.Text)
Nt = Val(Text2.Text)
Pi = 3.141592654
Miuc = Val(Form2.Label12)
Rec = ((4 * mc) / (Nt * Pi * d1 * Miuc)) Label36.Caption = Rec
End Sub
Private Sub Command2_Click() Rec = Val(Label36)
Prc = Val(Form2.Label14) d1 = Val(Text1.Text) La = Val(Text7.Text) If Rec < 2100 Then
Nuc = 1.86 * ((Rec * Prc * d1 / La) ^ (1 / 3)) ElseIf Rec > 10000 Then
Nuc = 0.023 * (Rec ^ 0.8) * (Prc ^ 0.4) * (La / La) Else
Nuc = 0.116 * ((Rec ^ (2 / 3)) - 125) * (1 + ((d1 / La) ^ (2 / 3))) * (Prc ^ (1 / 3))
End If
Label37.Caption = Nuc End Sub
Private Sub Command3_Click() Nuc = Val(Label37) kc = Val(Form2.Label13) d1 = Val(Text1.Text) hi = Nuc * kc / d1 Label38.Caption = hi End Sub
Private Sub Command4_Click() d2 = Val(Text4.Text)
Pt = Val(Text5.Text) Pi = 3.141592654
If Option1.Value = True Then
De = (3.44 * Pt ^ 2 - Pi * d2 ^ 2) / (Pi * d2) ElseIf Option2.Value = True Then
De = (4 * Pt ^ 2 - Pi * d2 ^ 2) / (Pi * d2) End If
Label39.Caption = Format(De, "0.#########") End Sub
Private Sub Command5_Click() mh = Val(Form1.Text5.Text) Di = Val(Text3.Text) Lb = Val(Text6.Text) Pt = Val(Text5.Text) d2 = Val(Text4.Text) Gt = mh / (Di * Lb * (Pt - d2) / Pt) Label40.Caption = Gt End Sub
Private Sub Command6_Click() Gt = Val(Label40) De = Val(Label39) Miuh = Val(Form1.Label12) Reh = Gt * De / Miuh Label41.Caption = Reh End Sub
Reh = Val(Label41) Prh = Val(Form1.Label14)
Nuh = 0.36 * Reh ^ 0.55 * Prh ^ (1 / 3) Label42.Caption = Nuh
End Sub
Private Sub Command8_Click() Nuh = Val(Label42) kh = Val(Form1.Label13) De = Val(Label39) ho = Nuh * kh / De Label43.Caption = ho End Sub
Private Sub Command9_Click() Thi = Val(Form1.Text3.Text) Tho = Val(Form1.Text4.Text) Tci = Val(Form2.Text3.Text) Tco = Val(Form2.Label22) - 273 Th = (Tho + Thi) / 2 Tc = (Tco + Tci) / 2
Tt = (((d2 / d1) * ho * Th) + (hi * Tc)) / (((d2 / d1) * ho) + hi) TabelTembaga Tt, kond TabelAir Tt, Cpht, Miuht, kht, Prht TabelAirlaut Tt, Cpct, Miuct, kct, Prct Label44.Caption = Tt + 273 Label13.Caption = kond Label17.Caption = Format(Miuct, "0.#########") Label18.Caption = Format(Miuht, "0.#########") End Sub
hi = Val(Label38)
Miuc = Val(Form2.Label12) Miuct = Val(Label17) If Rec < 10000 Then
hi2 = hi * ((Miuc / Miuct) ^ 0.14) End If
Label45.Caption = hi2 End Sub
Private Sub Command11_Click() ho = Val(Label43)
Miuh = Val(Form1.Label12) Miuht = Val(Label18)
ho2 = ho * ((Miuh / Miuht) ^ 0.14) Label46.Caption = ho2
End Sub
Private Sub Command12_Click() d1 = Val(Text1.Text)
d2 = Val(Text4.Text) hi2 = Val(Label45) ho2 = Val(Label46) kond = Val(Label13)
Ui = 1 / (d1 / (ho2 * d2) + ((d1 * ln(d2 / d1)) / (2 * kond)) + (1 / hi2)) Label47.Caption = Ui
End Sub
Private Sub Command13_Click() q = Val(Form1.Label19)
LMTD = Val(Form2.Label18) Nt = Val(Text2.Text)
F = Val(Form2.Label19) d1 = Val(Text1.Text) Pi = 3.141592654 L = q / (LMTD * Nt * Ui * F * Pi * d1) Label48.Caption = L End Sub
Private Sub Form_Load() End Sub
5. Simulasi APK yang telah dirancang.
Gambar L.5. Form5.frm.
Public Thi, Tho, Tci, mh, mc, d1, d2, Di, Pt, Nt, Lb, Lbi, Lbo, q, Pi, L, LMTD, hi, ho, P, R, F, De, numlnX
Public CpAir, MiuAir, kAir, PrAir, CpAirlaut, MiuAirlaut, kAirlaut, PrAirlaut, Rec, Reh
Private Sub Command1_Click() d1 = Val(Text1.Text) d2 = Val(Text2.Text) Nt = Val(Text3.Text) Nb = Val(Text20.Text) Di = Val(Text4.Text) L = Val(Text5.Text) Dctl = Val(Text6.Text) Dotl = Val(Text7.Text) Lsb = Val(Text8.Text)
Ltb = Val(Text9.Text) Lbb = Val(Text10.Text) Pt = Val(Text11.Text) mh = Val(Text12.Text) Thi = Val(Text13.Text) Thsem = Val(Text18.Text) mc = Val(Text14.Text) Tci = Val(Text15.Text) Tcsem = Val(Text19.Text) Lb = Val(Text16.Text) BC = Val(Text17.Text) Pi = 4 * Math.Atn(1)
TabelAirlaut Tcsem, Cpc, Miuc, kc, Prc TabelAir Thsem, Cph, miuh, kh, Prh Rec = (4 * (mc / Nt)) / (Pi * d1 * Miuc) If Rec < 2100 Then
Nuc = 1.86 * ((Rec * Prc * d1 / L) ^ (1 / 3)) ElseIf Rec > 10000 Then
Nuc = 0.023 * (Rec ^ 0.8) * (Prc ^ 0.4) * (L / L) Else Nuc = 0.116 * ((Rec ^ (2 / 3)) - 125) * (1 + ((d1 / L) ^ (2 / 3))) * (Prc ^ (1 / 3)) End If hc = Nuc * kc / d1 Sm = Lb * (Lbb + ((Dctl / Pt) * (Pt - d2))) Gh = mh / Sm If BC > 10 Then Tetactl = (2 * (ArcCos((Di / Dctl) * (1 - (2 * (BC / 100)))))) * 180 / Pi Else Tetactl = 0 End If If BC > 10 Then
Fw = (Tetactl / 360) - (Sin(Tetactl * Pi / 180) / (2 * Pi)) Else Fw = 0.1875 End If If BC > 10 Then Fc = 1 - (2 * Fw) Else Fc = 0.625 End If
Reh = d2 * Gh / miuh Tetads = 2 * (ArcCos(1 - (2 * (BC / 100)))) * 180 / Pi Ssb = 0.00436 * Di * Lsb * (360 - Tetads) Stb = (((Pi / 4) * (((d2 + Ltb) ^ 2) - (d2 ^ 2))) * (Nt) * (1 - Fw)) rs = Ssb / (Ssb + Stb) rlm = (Ssb + Stb) / Sm Sb = Lb * (Di - Dotl) Fsbp = Sb / Sm If Reh > 100 Then Cbh = 1.25 Else Cbh = 1.35 End If
If Option1.Value = True Then a1 = 0.107
a2 = -0.266 a3 = 1.187 a4 = 0.37
ElseIf Option2.Value = True Then a1 = 0.321 a2 = -0.388 a3 = 1.45 a4 = 0.519 End If A = a3 / (1 + (0.14 * (Reh ^ a4))) ji = a1 * ((1.33 / (Pt / d2)) ^ A) * (Reh ^ a2) If BC > 10 Then JC = 0.55 + (0.72 * Fc) Else JC = 1 End If JL = (0.44 * (1 - rs)) + ((1 - (0.44 * (1 - rs))) * Exp(-2.2 * rlm)) JB = Exp(-Cbh * Fsbp) Lbi = (L - ((Nb * 2 / 1000) + ((Nb - 1) * Lb))) / 2 Lbo = (L - ((Nb * 2 / 1000) + ((Nb - 1) * Lb))) / 2
JS = ((Nb - 1) + ((Lbi / Lb) ^ (1 - 0.6)) + ((Lbo / Lb) ^ (1 - 0.6))) / ((Nb - 1) + (Lbi / Lb) + (Lbo / Lb))
Tw = ((hoideal * d2 * (Thsem + 273)) + (hc * d1 * (Tcsem + 273))) / ((hc * d1) + (hoideal * d2))
TabelAir Tw - 273, cpw, miuw, kw, Prw TabelTembaga Tw - 273, kond
Jmiu = (miuh / miuw) ^ 0.14
ho = JC * JL * JB * JS * Jmiu * hoideal
TabelAirlaut Tw - 273, cpaw, miuaw, kaw, Praw hcbaru = hc * ((Miuc / miuaw) ^ 0.14)
Uo = 1 / (((d2 / d1) * (1 / hcbaru)) + ((d2 / (2 * kond)) * (ln(d2 / d1))) + (1 / ho)) Ch = mh * Cph Cc = mc * Cpc Ao = Nt * Pi * d2 * L If Cc < Ch Then C = Cc / Ch Else C = Ch / Cc End If If Cc < Ch Then NTU = Uo * Ao / Cc Else NTU = Uo * Ao / Ch End If E = 2 * ((1 + C + ((1 + ((C ^ 2) ^ 0.5)) * ((1 + (Exp(-NTU * ((1 + (C ^ 2)) ^ 0.5)))) / (1 - (Exp(-NTU * ((1 + (C ^ 2)) ^ 0.5))))))) ^ -1) If Cc < Ch Then
Tco = Tci + (E * (Thi - Tci)) Else
Tho = Thi - (E * (Thi - Tci)) End If If Cc < Ch Then q = Cc * (Tco - Tci) Else q = Ch * (Thi - Tho) End If If Cc < Ch Then
Tho = Thi - ((Cc / Ch) * (Tco - Tci)) Else
Tco = Tci + ((Ch/Cc) * (Thi - Tho)) End If
Tc = (Tci + Tco) / 2 Th = (Thi + Tho) / 2 Label34.Caption = Miuc Label35.Caption = Cpc Label36.Caption = kc Label37.Caption = Prc Label30.Caption = Rec Label31.Caption = Nuc Label32.Caption = hc Label46.Caption = Tco Label47.Caption = Tc Label52.Caption = miuh Label53.Caption = Cph Label55.Caption = kh Label56.Caption = Prh Label57.Caption = Gh Label58.Caption = Reh Label59.Caption = ho Label60.Caption = Tho Label61.Caption = Th Label62.Caption = Uo Label63.Caption = E * 100 End Sub
6. Modul tabel air, tabel air laut, dan fungsi ln.
Public Thi, Tho, Tci, mh, mc, d1, d2, Di, Pt, Nt, Lb, q, Pi, L, LMTD, hi, ho, P, R, F, De, numlnX
Public CpAir, MiuAir, kAir, PrAir, CpAirlaut, MiuAirlaut, kAirlaut, PrAirlaut, Rec, Reh
Public i() As Variant
'Tabel Air berdasarkan Incropera sebagai berikut 'Urutannya Temperatur, Cp, Miu, k, Pr
Sub TabelAir(Tem, ketCp, ketMiu, ketk, ketPr) Dim Daf(4, 21), Tes
Dim i As Integer
Daf(0, 0) = 273.15: Daf(1, 0) = 4217: Daf(2, 0) = 0.00175: Daf(3, 0) = 0.659: Daf(4, 0) = 12.99
Daf(0, 1) = 275: Daf(1, 1) = 4211: Daf(2, 1) = 0.001652: Daf(3, 1) = 0.574: Daf(4, 1) = 12.22
Daf(0, 2) = 280: Daf(1, 2) = 4198: Daf(2, 2) = 0.001422: Daf(3, 2) = 0.582: Daf(4, 2) = 10.26
Daf(0, 3) = 285: Daf(1, 3) = 4189: Daf(2, 3) = 0.001225: Daf(3, 3) = 0.59: Daf(4, 3) = 8.81
Daf(0, 4) = 290: Daf(1, 4) = 4184: Daf(2, 4) = 0.00108: Daf(3, 4) = 0.598: Daf(4, 4) = 7.56
Daf(0, 5) = 295: Daf(1, 5) = 4181: Daf(2, 5) = 0.000959: Daf(3, 5) = 0.606: Daf(4, 5) = 6.62
Daf(0, 6) = 300: Daf(1, 6) = 4179: Daf(2, 6) = 0.000855: Daf(3, 6) = 0.613: Daf(4, 6) = 5.83
Daf(0, 7) = 305: Daf(1, 7) = 4178: Daf(2, 7) = 0.000769: Daf(3, 7) = 0.62: Daf(4, 7) = 5.2
Daf(0, 8) = 310: Daf(1, 8) = 4178: Daf(2, 8) = 0.000695: Daf(3, 8) = 0.628: Daf(4, 8) = 4.62
Daf(0, 9) = 315: Daf(1, 9) = 4179: Daf(2, 9) = 0.000631: Daf(3, 9) = 0.634: Daf(4, 9) = 4.16
Daf(0, 10) = 320: Daf(1, 10) = 4180: Daf(2, 10) = 0.000577: Daf(3, 10) = 0.64: Daf(4, 10) = 3.77
Daf(0, 11) = 325: Daf(1, 11) = 4182: Daf(2, 11) = 0.000528: Daf(3, 11) = 0.645: Daf(4, 11) = 3.42
Daf(0, 12) = 330: Daf(1, 12) = 4184: Daf(2, 12) = 0.000489: Daf(3, 12) = 0.65: Daf(4, 12) = 3.15
Daf(0, 13) = 335: Daf(1, 13) = 4186: Daf(2, 13) = 0.000453: Daf(3, 13) = 0.656: Daf(4, 13) = 2.88
Daf(0, 14) = 340: Daf(1, 14) = 4188: Daf(2, 14) = 0.00042: Daf(3, 14) = 0.66: Daf(4, 14) = 2.66
Daf(0, 15) = 345: Daf(1, 15) = 4191: Daf(2, 15) = 0.000389: Daf(3, 15) = 0.668: Daf(4, 15) = 2.45
Daf(0, 16) = 350: Daf(1, 16) = 4195: Daf(2, 16) = 0.000365: Daf(3, 16) = 0.668: Daf(4, 16) = 2.29
Daf(0, 17) = 355: Daf(1, 17) = 4199: Daf(2, 17) = 0.000343: Daf(3, 17) = 0.671: Daf(4, 17) = 2.14
Daf(0, 18) = 360: Daf(1, 18) = 4203: Daf(2, 18) = 0.000324: Daf(3, 18) = 0.674: Daf(4, 18) = 2.02
Daf(0, 19) = 365: Daf(1, 19) = 4209: Daf(2, 19) = 0.000306: Daf(3, 19) = 0.677: Daf(4, 19) = 1.91
Daf(0, 20) = 370: Daf(1, 20) = 4214: Daf(2, 20) = 0.000289: Daf(3, 20) = 0.679: Daf(4, 20) = 1.8
Daf(0, 21) = 373.15: Daf(1, 21) = 4217: Daf(2, 21) = 0.000279: Daf(3, 21) = 0.68: Daf(4, 21) = 1.76
For i = 0 To 21 Step 1 Tes = Daf(0, i) - Temp If Tes >= 0 Then ATem = Daf(0, i) ACp = Daf(1, i) AMiu = Daf(2, i) Ak = Daf(3, i) APr = Daf(4, i) Exit For End If Next i For i = 21 To 0 Step -1 Tes = Temp - Daf(0, i) If Tes > 0 Then
BTem = Daf(0, i) BCp = Daf(1, i) BMiu = Daf(2, i) Bk = Daf(3, i)
BPr = Daf(4, i) Exit For End If Next i
If ATem = BTem Then ketCp = ACp
ketMiu = AMiu ketk = Ak ketPr = APr Else
Perb = (BTem - Temp) / (BTem - ATem) ketCp = BCp - Perb * (BCp - ACp) ketMiu = BMiu - Perb * (BMiu - AMiu) ketk = Bk - Perb * (Bk - Ak)
ketPr = BPr - Perb * (BPr - APr) End If
End Sub
Sub TabelAirlaut(Tem, ketCp, ketMiu, ketk, ketPr) 'Tabel Air Laut berdasarkan Mostafa sebagai berikut 'Urutannya adalah Temperatur, Cp, Miu, k, Pr Dim Daf(4, 10), Tes
Dim i As Integer
Temp = Val(Tem)
Daf(0, 0) = 0: Daf(1, 0) = 4024.884: Daf(2, 0) = 0.0018842: Daf(3, 0) = 0.57: Daf(4, 0) = 13.3052
Daf(0, 1) = 10: Daf(1, 1) = 4027.28: Daf(2, 1) = 0.00137984: Daf(3, 1) = 0.587: Daf(4, 1) = 9.4744
Daf(0, 2) = 20: Daf(1, 2) = 4029.532: Daf(2, 2) = 0.00106324: Daf(3, 2) = 0.602: Daf(4, 2) = 7.1152
Daf(0, 3) = 30: Daf(1, 3) = 4031.856: Daf(2, 3) = 0.00084948: Daf(3, 3) = 0.616: Daf(4, 3) = 5.5652
Daf(0, 4) = 40: Daf(1, 4) = 4034.612: Daf(2, 4) = 0.00069772: Daf(3, 4) = 0.62808: Daf(4, 4) = 4.4852
Daf(0, 5) = 50: Daf(1, 5) = 4037.924: Daf(2, 5) = 0.00058588: Daf(3, 5) = 0.63908: Daf(4, 5) = 3.706
Daf(0, 6) = 60: Daf(1, 6) = 4042.076: Daf(2, 6) = 0.00050104: Daf(3, 6) = 0.649: Daf(4, 6) = 3.1168
Daf(0, 7) = 70: Daf(1, 7) = 4047.36: Daf(2, 7) = 0.00043512: Daf(3, 7) = 0.65708: Daf(4, 7) = 2.6768
Daf(0, 8) = 80: Daf(1, 8) = 4053.876: Daf(2, 8) = 0.0003822: Daf(3, 8) = 0.66408: Daf(4, 8) = 2.3276
Daf(0, 9) = 90: Daf(1, 9) = 4062.108: Daf(2, 9) = 0.00033928: Daf(3, 9) = 0.67: Daf(4, 9) = 2.0576
Daf(0, 10) = 100: Daf(1, 10) = 4072.056: Daf(2, 10) = 0.00030436: Daf(3, 10) = 0.675: Daf(4, 10) = 1.8376
For i = 0 To 10 Step 1 Tes = Daf(0, i) - Temp If Tes >= 0 Then ATem = Daf(0, i) ACp = Daf(1, i) AMiu = Daf(2, i) Ak = Daf(3, i) APr = Daf(4, i) Exit For End If Next i For i = 10 To 0 Step -1 Tes = Temp - Daf(0, i) If Tes > 0 Then
BTem = Daf(0, i) BCp = Daf(1, i)
BMiu = Daf(2, i) Bk = Daf(3, i) BPr = Daf(4, i) Exit For End If Next i
If ATem = BTem Then ketCp = ACp
ketMiu = AMiu ketk = Ak ketPr = APr Else
Perb = (BTem - Temp) / (BTem - ATem) ketCp = BCp - Perb * (BCp - ACp) ketMiu = BMiu - Perb * (BMiu - AMiu) ketk = Bk - Perb * (Bk - Ak)
ketPr = BPr - Perb * (BPr - APr) End If
End Sub
Sub TabelTembaga(Tem, ketkond)
'Tabel Tembaga berdasarkan Incropera sebagai berikut 'Urutannya adalah Temperatur, kond
Dim Daf(1, 5), Tes Dim i As Integer Temp = Val(Tem + 273.15) Daf(0, 0) = 100: Daf(1, 0) = 482: Daf(0, 1) = 200: Daf(1, 1) = 413: Daf(0, 2) = 300: Daf(1, 2) = 401: Daf(0, 3) = 400: Daf(1, 3) = 393:
Daf(0, 4) = 600: Daf(1, 4) = 379: Daf(0, 5) = 800: Daf(1, 5) = 366: For i = 0 To 5 Step 1
Tes = Daf(0, i) - Temp If Tes >= 0 Then ATem = Daf(0, i) Akond = Daf(1, i) Exit For End If Next i For i = 5 To 0 Step -1 Tes = Temp - Daf(0, i) If Tes > 0 Then BTem = Daf(0, i) Bkond = Daf(1, i) Exit For End If Next i
If ATem = BTem Then ketkond = Akond Else
Perb = (BTem - Temp) / (BTem - ATem) ketkond = Bkond - Perb * (Bkond - Akond) End If
End Sub
Function ln(numX)
ln = (Log(numX) / Log(Exp(1))) End Function
Gambar L.6. Pemasangan sekat pada bundle tabung.
Gambar L.8. APK yang siap diuji.
Gambar L.10. Pengambilan data.
Gambar L.12. Jarak baffle 40 mm.
Gambar L.14. Jarak baffle 49 mm.
Gambar L.16. Jarak baffle 63 mm.