Evaporator1_CL,Evaporator2_CL&Evaporator3_CL強(qiáng)制對(duì)流式空氣冷卻型蒸發(fā)器2一般為翅片管式，并配置風(fēng)機(jī)以強(qiáng)化空氣側(cè)的換熱。最常見的是纏繞圓翅片和平直大套片。此類蒸發(fā)器廣泛用于間冷式冰箱的冷凍室、家用空調(diào)器、庫房速凍室的冷風(fēng)機(jī)及除濕機(jī)。纏繞圓翅片平直大套片ε-NTU3對(duì)于逆流換熱器

計(jì)算流程/02Reference:HeatTransfer,NellisandKlein,2009,CambridgeUniversityPress,section8.5Procedureevaporator1_cl5

callcomp1_unit_check

callerror(‘Evaporator1_CLexpectstheinletrefrigerantstatetobesaturated’)

callerror(‘Thedegreesofsuperheatingmustbe>=0’)callevaporator1_si

YESYESNONO適用條件：兩相

過熱與空氣換熱已知：空氣側(cè)的換熱系數(shù)制冷劑側(cè)飽和階段和過熱階段的換熱系數(shù)輸出：換熱面積Subprogramevaporator1_si6

Procedureevaporator2_cl7

callcomp1_unit_check

callerror(‘Evaporator2_CLexpectstheinletrefrigerantstatetobesaturated’)callevaporator1_si

YESNO適用條件：兩相

兩相/過熱與空氣換熱已知：空氣側(cè)的換熱系數(shù)制冷劑側(cè)飽和階段和過熱階段的換熱系數(shù)輸出：制冷劑和空氣的出口狀態(tài)Subprogramevaporator2_si8

NOYESNOYES

NO

YESYESNO正割法求根dummyvalue

Procedureevaporator3_cl9callerror(‘Thedegreesofsuperheatingmustbe>=0inEvaporator3_CL’)callevaporator3_si

YESNO

callcomp1_unit_check

callerror(‘Evaporator3_CLexpectstheinletrefrigerantstatetobesaturated’)

NO

callerror('Evaporator3_CLexpectstheairtemperaturetobehigherthanthesaturationtemperature')NOYES適用條件：兩相

過熱與空氣換熱已知：入口條件計(jì)算：(CompactHXsurfacelibrary)空氣側(cè)換熱系數(shù)制冷劑飽和階段換熱系數(shù)過熱階段換熱系數(shù)輸出：換熱面積Subprogramevaporator3_si10

procedures11GeometryProcedureCHX_geom_finned_tube(TypeHX$:D_o,fin_pitch,D_h,fn_thk,sigma,alpha,A_fin\A)

——適用于翅片圓管和扁管CoefficientofHeatTransferProcedureCHX_h_finned_tube(TypeHX$,m_dot,A_fr,Fluid$,T,P:h) ——空氣側(cè)換熱系數(shù)的計(jì)算ProcedurePipeFlow(Fluid$,T,P,m_dot,D,L,RelRough:h_T,h_H,DELTAP,Nusselt_T,f,Re) ——制冷劑側(cè)過熱階段換熱系數(shù)計(jì)算FunctionFlow_Boiling_avg(Fluid$,T_sat,G,d,x_1,x_2,q’’,OR$) ——制冷劑側(cè)飽和階段換熱系數(shù)計(jì)算PressureDropProcedureCHX_DELTAp_finned_tube(TypeHX$,m_dot,A_fr,L,Fluid$,T_i,T_o,P:DELTAp)