《制冷空调数字化设计》课件 4 部件库函数Evaporator1-3

Evaporator1_CL,Evaporator2_CL&Evaporator3_CL强制对流式空气冷却型蒸发器2一般为翅片管式，并配置风机以强化空气侧的换热。最常见的是缠绕圆翅片和平直大套片。此类蒸发器广泛用于间冷式冰箱的冷冻室、家用空调器、库房速冻室的冷风机及除湿机。缠绕圆翅片平直大套片ε-NTU3对于逆流换热器

计算流程/02Reference:HeatTransfer,NellisandKlein,2009,CambridgeUniversityPress,section8.5Procedureevaporator1_cl5

callcomp1_unit_check

callerror(‘Evaporator1_CLexpectstheinletrefrigerantstatetobesaturated’)

callerror(‘Thedegreesofsuperheatingmustbe>=0’)callevaporator1_si

YESYESNONO适用条件：两相

过热与空气换热已知：空气侧的换热系数制冷剂侧饱和阶段和过热阶段的换热系数输出：换热面积Subprogramevaporator1_si6

Procedureevaporator2_cl7

callcomp1_unit_check

callerror(‘Evaporator2_CLexpectstheinletrefrigerantstatetobesaturated’)callevaporator1_si

YESNO适用条件：两相

两相/过热与空气换热已知：空气侧的换热系数制冷剂侧饱和阶段和过热阶段的换热系数输出：制冷剂和空气的出口状态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适用条件：两相

过热与空气换热已知：入口条件计算：(CompactHXsurfacelibrary)空气侧换热系数制冷剂饱和阶段换热系数过热阶段换热系数输出：换热面积Subprogramevaporator3_si10

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

——适用于翅片圆管和扁管CoefficientofHeatTransferProcedureCHX_h_finned_tube(TypeHX$,m_dot,A_fr,Fluid$,T,P:h) ——空气侧换热系数的计算ProcedurePipeFlow(Fluid$,T,P,m_dot,D,L,RelRough:h_T,h_H,DELTAP,Nusselt_T,f,Re) ——制冷剂侧过热阶段换热系数计算FunctionFlow_Boiling_avg(Fluid$,T_sat,G,d,x_1,x_2,q’’,OR$) ——制冷剂侧饱和阶段换热系数计算PressureDropProcedureCHX_DELTAp_finned_tube(TypeHX$,m_dot,A_fr,L,Fluid$,T_i,T_o,P:DELTAp)