冷凝器-蒸发器设计计算

1冷凝器计算1.1管型选择管轧低翅片管坯管16*1.5φ16*1.5di/mm10.4dt/mm15.1δt/mm0.4db/mm12.4Sf/mm1.2单位管长换热面积m2ad0.015804667af0.09714375ab0.025957333ai0.032656aof0.138905751.2估算换热管总长取热流密度q0W/m26000冷凝器热负荷Qk/kW407.212传热面积Aofm267.86866667应布置有效总管长L488.59508461.3确定每流程管数Z有效单管长l流程数N冷却水进口水温tw1/℃30冷却水出口水温tw2/℃35平均温度下水密度ρ/㎏/m3994.93比定压比热容Cp/J/（kg•K）4179所需水量qv/m3/s0.0195878取冷却水流速w/m/s2.5则每流程管数Z92.28036886取整数Z92组合计算流程数N总根数NZ有效单管长l/m壳内径Di/m21842.6554076090.33857391343681.3277038040.47881581965520.885135870.58642721987360.6638519020.677147826选取2流程方案1.4传热管布置见图1.5传热计算及面积计算运动粘度ν/m2/s0.7685*10^(-6)物性集合系数B2147雷诺数Re33951.42335为湍流水侧表面传热系数awiw/(m2*k)11137.235管排修正系数εn0.733144414环翅高度h'/mm3.86增强系数ψ1.384冷凝温度40℃时B1447.1氟利昂侧冷凝表面传热系数ako3190.1180093190.12θ0^(-0.25)对数平均温差θm/℃7.21取水侧污垢系数ri0.000086计算热流密度q03190.12θ0^(-0.25)q01308*(7.21-θ0)θ0q0q025365.1175966814.682.25762.670126553.082.46151.2755246291.482.426189.6810876265.322.456247.1410566226.08取q06236.610528所需面积Aof65.29379992设计面积67.86866667富裕量3.79%1.6冷却水侧阻力计算阻力系数ε0.023308911冷却水侧阻力Δp/pa53745.054311.7连接管管径计算设进出水接管水流速W/m/s1.2进出水水管内径di0.144200704选取无缝钢管Φ159mm*4.5mm2蒸发器计算蒸发器冷负荷kw/s343.9282.1计算传热面积对数平均温差Δm/℃7.213475204取传热系数K425传热面积A112.18481112.2循环水量计算循环水量qmkg/s16.37752381循环水体积流量qvm3/s0.016382.3管型选择管轧低翅片管坯管16*1.5φ16*1.5di/mm10.4dt/mm15.1δt/mm0.4db/mm12.4Sf/mm1.2单位管长换热面积ad0.0158af0.0972ab0.026ai0.0327aof0.1392.4估算换热管总长应布置有效总管长L807.08497172.5确定每流程管数Z有效单管长l流程数N取冷冻水流速w/m/s2.5则每流程管数Z77.16805488取整数Z77组合计算流程数N总根数NZ有效单管长l/m壳内径Di/m21545.2408115050.30974545443082.6204057520.43804622264621.7469371680.53649486486161.3102028760.6194909082.6管排布置见图2.7传热计算及面积计算运动粘度ν/m2/s1.31*10^(-7)物性集合系数B1616.57雷诺数Re14533.2588为湍流水侧表面传热系数awiw/(m2*k)8385.710285R22侧传热系数沸腾压力kpa530.992传热系数akow/(m2*k)1507.583893取水侧污垢热阻rim2*k/w0.000086取R22侧污垢热阻rw0.0001167总传热系数k481.3294097所需传热面积99.05595573设计面积112.18误差0.132491218满足要求2.8载冷剂侧阻力计算阻力系数ε0.028816798冷却水侧阻力Δp/pa105864.09042.9连接管管径计算设进出水接管水流速W/m/s1进出水水管内径di/m0.144451521选取无缝钢管Φ159mm*4.5mm蒸发器进口R22体积流量m3/s0.005552长径比l/Di7.8429185142.7728904331.5093703720.980364814长径比l/Di16.919736625.982030253.2562048312.114967078