翅片式换热器计算

设计基本参数冷凝温度50℃盘管基本参数管排数9rows每排管的管数量19条每英寸的翅片数量13FIN每根铜管的长度0.65m换热器结构计算传热管直径do0.009525m传热管壁厚δ0.00035m流动方向管间距s10.0254m排间距s20.02200m片厚δ0.000115m翅片间距Sf0.00195m翅片根部外沿直径db0.009755m每米翅片侧外表面积af0.495457975m^2每米翅片间基管外表面积ab0.02882783m^2每米翅片侧总表面积aof0.524285806m^2铜管内径di0.008825m每米长管内面积ai0.027724555m^2每米长管外面积ao0.0306307m^2每米管平均直径处的表面积0.0291706肋化系数τ18.91052215肋通系数α20.64117345迎风风速w3.25m/s净面比ε0.579691433最窄截面风速Wmax5.606430964m/s空气侧表面传热系数沿气流方向翅片长度b0.197973407m当量直径de0.003290895m雷诺系数Re1185.134493b/de60.15792878A0.010278544c1.075567722n0.84704233m-0.185189241α016.6048117521.91835151C1.186m-0.222ψ0.2225n0.569λ0.0276α0472.2718053冷凝器进出口空气参数Q015系数φ01.318Qk19.77室外干球温度ta135℃进出口温差19℃出风温度ta216℃空气平均温度25.5℃对数平均温差θm-23.22℃比热容Cpa1.005运动粘度ν0.000015568热导率0.026295密度ρ1.1465冷凝器外表面效率铝翅片热导率203肋片当量高度h0.010609833翅片特性参数m43.33332384翅片效率ηf0.935028419冷凝器外表面效率ηo0.938600879管内换热系数物性集合系数B1325.4传热系数3897.708063总传热系数r00.0034rb0.0001铜管导热率393第一系数0.004851703第二系数1.60066E-05第三系数0.048608381Ko17.55122173传热面积Aof58.27436728换热量-23747.64186迎风面积0.31369m^2翅片宽度b197.9734073假定风速3.25m/s35度时空气密度ρa1.1465最窄截面风速Wmax5.606430964ρa*Wmax6.4277731(ρa*Wmax)1.723.64301807最窄截面当量直径0.003290895静压153.6100197单片盘管单元的风量1.0194925m^3/s风机风量3670.173m^3/h校核气温差17.10596081计算风速222.6884456换热量的计算风侧换热量22.32-2.064002709X-4-36-12-70100.844.6-0.5572根据下面的算出来考虑使用叉排和波纹片的修正系数考虑使用叉排和波纹片的修正系数采用公式计算法根据Re和b/de查表得出的假定t(℃)ρ(kg/m3)301.165401.128根据进风温度查表得出的47.766.53893573248.543106910.78591376239.44728551948.854032内螺纹修正系数固定参数固定参数固定参数总的换热量假定222.68844562.038985求解tw根据平均温度查表得出的风侧换热量cp(kJ/(kg*K))λ×102(W/(m*K))a*106(m2/s)μ*106(kg/(m*s))ν*106(m2/s)1.0052.6722.918.6161.0052.7624.319.116.96Pr0.7010.699