Perhitungan awal dan perhitungan laju perpindahan panas. Perhitungan LMTD dan faktor koreksi.

Ltb = ValText9.Text Lbb = ValText10.Text Pt = ValText11.Text mh = ValText12.Text Thi = ValText13.Text Thsem = ValText18.Text mc = ValText14.Text Tci = ValText15.Text Tcsem = ValText19.Text Lb = ValText16.Text BC = ValText17.Text Pi = 4 Math.Atn1 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 ArcCosDi Dctl 1 - 2 BC 100 180 Pi Else Tetactl = 0 End If If BC 10 Then Fw = Tetactl 360 - SinTetactl 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 ArcCos1 - 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 hoideal = ji Cph Gh Prh -2 3 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 lnd2 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 + ChCc 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 TabelAirTem, ketCp, ketMiu, ketk, ketPr Dim Daf4, 21, Tes Dim i As Integer Temp = ValTem + 273.15