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