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翅片冷凝器工艺计算表
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翅片
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冷凝器
- 翅片
- 冷凝器
| 翅片式冷凝器工艺计算 | DFBR40Q
(光管φ7) |
DFBR40Q
(光管φ7) |
DWR28S
(内螺纹管φ7) |
DWR28S
(R134a) |
DWR28S
(R407C) |
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| 项目 | 单位 | 代号 | 计算数据 | 计算数据 | 计算数据 | 计算数据 | 计算数据 | ||||||||
| 一.工况设计参数确定 | |||||||||||||||
| 冷凝温度 | ℃ | tc | 35 | 27.5 | 52.53280193 | 51.74977136 | 51.74977136 | ||||||||
| 过冷度 | ℃ | ΔTc | 8 | 8 | 5 | 5 | 5 | ||||||||
| 压缩机吸气温度 | ℃ | t1 | 10 | 10 | 15.2 | 15.2 | 15.2 | ||||||||
| 冷凝器进风温度 | ℃ | tai | 7 | -7 | 35 | 35 | 35 | ||||||||
| 冷凝器出风温度 | ℃ | tao | 24.6 | 24.6 | 44 | 44 | 44.4 | ||||||||
| 压缩机标称冷量 | kW | Q0'(tc=52,te=7.2,ΔTc=5,ΔTe=8) | 35 | 35 | 14.45 | 14.45 | 14.45 | ||||||||
| 压缩机标称功率 | P(tc=52,te=7.2,ΔTc=5,ΔTe=8) | 9 | 9 | 4.22 | 4.22 | 4.22 | |||||||||
| 设计需求 | kW | Q0=Qo'*95%*98% | 32.585 | 32.585 | 13.45295 | 13.45295 | 13.45295 | ||||||||
| kj/kg | h0 | 409.6 | 409.6 | 407.4 | 402.6 | 412.26 | |||||||||
| kj/kg | h3=f(tc,ΔTc) | 224 | 224 | 259.1 | 266.78 | 271.78 | |||||||||
| 单位质量制冷量 | kj/kg | q0=h0-h3 | 185.6 | 185.6 | 148.3 | 135.82 | 140.48 | ||||||||
| kj/kg | h2' | 431.2 | 431.2 | 444.6 | 437 | 454.83 | |||||||||
| 冷凝器单位热负荷 | kj/kg | qk=h2'-h3 | 207.2 | 207.2 | 185.5 | 170.22 | 183.05 | ||||||||
| 负荷系数 | C1=qk/q0 | 1.11637931 | 1.11637931 | 1.250842886 | 1.253276395 | 1.30303246 | |||||||||
| 冷凝器热负荷 | kW | Qk=C1*Q0 | 36.37721983 | 36.37721983 | 16.8275268 | 16.86026468 | 17.52963053 | ||||||||
| 或Qk=P+Q0 | 41.585 | 41.585 | 17.67295 | 17.67295 | 17.67295 | ||||||||||
| 空气密度 | kg/m3 | ρ | 1.08 | 1.08 | 1.08 | 1.08 | 1.08 | ||||||||
| 比热 | kj/kg·k | Cpa | 1.01 | 1.01 | 1.01 | 1.01 | 1.01 | ||||||||
| 冷凝器进出口温差 | ℃ | tao-tai | 17.6 | 31.6 | 9 | 9 | 9.4 | ||||||||
| 空气流量 | m3/h | Va=3600Qk/{ρa*Cpa*(tao-tai)} | 6821.410859 | 3799.266807 | 6170.710232 | 6182.715321 | 6154.634694 | ||||||||
| 二.管外侧换热系数计算 | |||||||||||||||
| 空气运动粘度 | m2/s | vf | 0.0000175 | 0.0000175 | 0.0000175 | 0.0000175 | 0.0000175 | ||||||||
| 迎面风速 | m/s | Wf | 2.53 | 2.53 | 2.1021568 | 1.758737316 | 1.655295101 | ||||||||
| 铜管直径 | mm | d | 7 | 7 | 7 | 9.52 | 9.52 | ||||||||
| 铜管壁厚 | mm | δ | 0.3 | 0.3 | 0.32 | 0.35 | 0.35 | ||||||||
| 翅片厚度 | mm | δf | 0.115 | 0.115 | 0.115 | 0.115 | 0.115 | ||||||||
| 翅片间距 | mm | Sf | 2 | 2 | 1.8 | 1.8 | 1.8 | ||||||||
| 管间距（纵向） | mm | S1 | 21 | 21 | 21 | 25.4 | 25.4 | ||||||||
| 管间距（横向） | mm | S2 | 18.2 | 18.2 | 18.2 | 22 | 22 | ||||||||
| 圆周率 | π | 3.142 | 3.142 | 3.142 | 3.142 | 3.142 | |||||||||
| 翅片管外径 | mm | db | 7.23 | 7.23 | 7.23 | 9.75 | 9.75 | ||||||||
| 铜管内径（mm）Di | mm | di=d-2*δ | 6.4 | 6.4 | 6.36 | 8.82 | 8.82 | ||||||||
| mm2 | db2 | 52.2729 | 52.2729 | 52.2729 | 95.0625 | 95.0625 | |||||||||
| 片距与翅片管外径的比值 | Sf/db（要求=0.18~0.35） | 0.276625173 | 0.276625173 | 0.248962656 | 0.184615385 | 0.184615385 | |||||||||
| 两管间空气流通距离 | mm | s1-db | 13.77 | 13.77 | 13.77 | 15.65 | 15.65 | ||||||||
| 空气流过翅片有效流通截面 | mm | sf-δf | 1.885 | 1.885 | 1.685 | 1.685 | 1.685 | ||||||||
| 每米管长翅片间管子外表面积 | m2/m | fb=π*db*(1-δf/Sf)/1000 | 0.021410452 | 0.021410452 | 0.021265318 | 0.028677296 | 0.028677296 | ||||||||
| 每米管长翅片表面积 | m2/m | ff=2*(S1*S2-π*db2/4)/Sf/1000 | 0.341139637 | 0.341139637 | 0.379044041 | 0.537920451 | 0.537920451 | ||||||||
| 每米管长铜管内表面积 | m2/m | fi=πdi/1000 | 0.0201088 | 0.0201088 | #REF! | 0.02771244 | 0.02771244 | ||||||||
| 每米管长铜管内容积 | m3/m | V=π*(di/2)*(di/2)*1000 | 0.03217408 | 0.03217408 | #REF! | 0.06110593 | 0.06110593 | ||||||||
| 总面积 | m2/m | ft=ff+fb | 0.362550089 | 0.362550089 | 0.400309359 | 0.566597747 | 0.566597747 | ||||||||
| 翅化系数 | β=ft/fi | 18.02942439 | 18.02942439 | #REF! | 20.44561025 | 20.44561025 | |||||||||
| 当量直径 | mm | deq=2*(s1-db)(sf-δf)/{(s1-db)+(sf-δf)} | 3.316058767 | 3.316058767 | 3.002581689 | 3.042428613 | 3.042428613 | ||||||||
| 最大风速 | m/s | Wmax=(s1*sf)/{(s1-db)*(sf-δf)}*Wf | 4.093780159 | 4.093780159 | 3.424704161 | 3.049249441 | 2.86990423 | ||||||||
| 雷诺数 | Ref=Wmax*deq/vf/1000（Ref=500~10000） | 775.7266049 | 775.7266049 | 587.5973716 | 530.121357 | 498.9416425 | |||||||||
| 排数 | R | 8 | 8 | 2 | 2 | 2 | |||||||||
| 片宽 | mm | L=s2*R | 145.6 | 145.6 | 36.4 | 44 | 44 | ||||||||
| 长径比 | L/deq（比值要求=4~50） | 43.90754514 | 43.90754514 | 12.12290081 | 14.46213062 | 14.46213062 | |||||||||
| 系数A | A=0.518-0.02315*(L/deq)+0.000425*(L/deq)2-3*10-6*(L/deq)3 | 0.066941702 | 0.066941702 | 0.294469938 | 0.263017392 | 0.263017392 | |||||||||
| 系数C | c=A*(1.36-0.24*Ref/1000) | 0.078577884 | 0.078577884 | 0.358951972 | 0.32424018 | 0.326208374 | |||||||||
| 系数n | n=0.45+0.0066*L/deq | 0.739789798 | 0.739789798 | 0.530011145 | 0.545450062 | 0.545450062 | |||||||||
| 系数m | m=-0.28+0.08Ref/1000 | -0.217941872 | -0.217941872 | -0.23299221 | -0.237590291 | -0.240084669 | |||||||||
| 空气导热率 | W/m·k | λf | 0.0276 | 0.0276 | 0.0276 | 0.0276 | 0.0276 | ||||||||
| Refn | 137.3336635 | 137.3336635 | 29.35237045 | 30.62038713 | 29.62452564 | ||||||||||
| (L/deq)m | 0.438552854 | 0.438552854 | 0.559149723 | 0.53007836 | 0.52655776 | ||||||||||
| 管外侧对流换热系数 | W/m2k | α0=1000*(L/deq)^m*1.1*1.2*(cλfRefn/deq) | 51.99481945 | 51.99481945 | 71.48185596 | 63.02026139 | 60.93336248 | ||||||||
| 三.翅片管的表面效率 | |||||||||||||||
| 铝翅片导热率 | W/m·k | λ | 203 | 203 | 203 | 203 | 203 | ||||||||
| 系数m' | m'={2*α0/(λ*δf)}0.5 | 66.74182777 | 66.74182777 | 78.25569786 | 73.47814077 | 72.25129422 | |||||||||
| 系数ρ | ρ=S1/db | 2.904564315 | 2.904564315 | 2.904564315 | 2.605128205 | 2.605128205 | |||||||||
| l/S1（翅片孔为等边三角形） | 1 | 1 | 1 | 1 | 1 | ||||||||||
| 系数ρ' | ρ'=1.27*ρ(l/S1-0.3)0.5 | 3.086268729 | 3.086268729 | 3.086268729 | 2.768100424 | 2.768100424 | |||||||||
| db/2 | 3.615 | 3.615 | 3.615 | 4.875 | 4.875 | ||||||||||
| ρ'-1 | 2.086268729 | 2.086268729 | 2.086268729 | 1.768100424 | 1.768100424 | ||||||||||
| lnρ' | 1.12696283 | 1.12696283 | 1.12696283 | 1.018161318 | 1.018161318 | ||||||||||
| 1+0.35lnρ' | 1.394436991 | 1.394436991 | 1.394436991 | 1.356356461 | 1.356356461 | ||||||||||
| 当量翅高 | mm | h'=(db/2)*(ρ'-1)*(1+0.35lnρ')/1000 | 0.010516651 | 0.010516651 | 0.010516651 | 0.0116911 | 0.0116911 | ||||||||
| x=m'*h' | 0.701900482 | 0.701900482 | 0.822987831 | 0.859040319 | 0.844697132 | ||||||||||
| ex | 2.017583448 | 2.017583448 | 2.277293852 | 2.3608939 | 2.327272852 | ||||||||||
| e-x | 0.495642448 | 0.495642448 | 0.439117683 | 0.423568378 | 0.429687477 | ||||||||||
| th(m'*h')=(ex-e-x)/(ex+e-x) | 0.605572703 | 0.605572703 | 0.676692815 | 0.69576289 | 0.688288966 | ||||||||||
| 翅片效率 | ηf=th(m'*h')/(m'*h') | 0.862761486 | 0.862761486 | 0.822239151 | 0.809930425 | 0.814835211 | |||||||||
| 翅片管的表面效率 | ηs=1-(1-ηf)(ff/ft) | 0.870866128 | 0.870866128 | 0.8316822 | 0.819550444 | 0.824206984 | |||||||||
| 四.管内对流换热系数 | |||||||||||||||
| rs0.25(查表) | 19.811 | 19.811 | 19.811 | 19.75 | 19.65 | ||||||||||
| Bm(查表) | 66.84 | 66.84 | 66.84 | 67.76 | 71.7 | ||||||||||
| di0.75 | 0.022627417 | 0.022627417 | 0.022521268 | 0.028780706 | 0.028780706 | ||||||||||
| 空气进出口平均温度 | ℃ | ta=(tai+tao)/2 | 15.8 | 8.8 | 39.5 | 39.5 | 39.7 | ||||||||
| Y=(ηsα0ft)/(0.683rs0.25*Bm*π*di0.75) | 0.255314092 | 0.255314092 | 0.371865947 | 0.354047811 | 0.327006394 | ||||||||||
| (tc-tw)0.75 | 6.727485815 | 3.443519191 | 3.13812626 | 2.883909239 | 2.706846663 | ||||||||||
| Y(Tw-Ta) | 1.659541596 | 3.446740237 | 3.13796056 | 2.883653114 | 2.706752024 | ||||||||||
| 5.067944219 | -0.003221046 | 0.0001657 | 0.000256125 | 9.46391E-05 | |||||||||||
| 管壁温度 | ℃ | (Tc-Tw)0.75=Y(Tw-Ta) Tw=? αi*π*di*(Tc-Tw)=ηs*α0*ft*(Tw-Ta) | 22.3 | 22.3 | 47.9384187 | 47.64481273 | 47.97736727 | ||||||||
| 管内对流换热系数 | W/m2k | αi=0.683rs^0.25*Bm*{di*(Tc-Tw)}^-0.25 | 1693.821414 | 2117.472182 | 2187.471783 | 2095.399609 | 2253.10129 | ||||||||
| 五.传热系数和冷凝面积计算 | |||||||||||||||
| 污垢热阻 | m2k/W | ri | 0 | 0 | 0 | 0 | 0 | ||||||||
| 接触热阻 | m2k/W | r0 | 0.001 | 0.001 | 0.001 | 0.001 | 0.001 | ||||||||
| 每米管长翅根管面平均面积 | m2 | fm=(fb-fi)/ln(fb/fi) | 0.020752823 | 0.020752823 | #REF! | 0.028192116 | 0.028192116 | ||||||||
| 传热系数 | W/m2k | K0=1/[(1/αi+ri)*β+(δt*ft)/(λt*fm)+r0+1/(ηs*α0)] | 29.63670146 | 31.63324181 | #REF! | 33.18204349 | 33.32909572 | ||||||||
| 最大温差 | ℃ | Δtmax=tc-tai | 28 | 34.5 | 17.53280193 | 16.74977136 | 16.74977136 | ||||||||
| 最小温差 | ℃ | Δtmin=tc-tao | 10.4 | 2.9 | 8.532801927 | 7.749771355 | 7.349771355 | ||||||||
| 对数平均温差 | ℃ | ΔTm=(tao-tai)/ln(Δtmax/Δtmin) | 17.77062099 | 12.76123898 | 12.49729684 | 11.67737337 | 11.41170842 | ||||||||
| 冷凝面积 | m2 | F0=1000Qk/(K0ΔTm) | 69.07120533 | 90.11414394 | #REF! | 43.51270613 | 46.08913588 | ||||||||
| 六.换热器结构参数确定 | |||||||||||||||
| 当量长度 | m | LT=F0/Ft | 190.5149313 | 248.5563972 | #REF! | 76.79646865 | 81.34366243 | ||||||||
| 冷凝器高度 | H | 546 | 546 | 840 | 812.8 | 812.8 | |||||||||
| 冷凝器长度 | m | L | 0.777 | 0.777 | 0.97 | 1.198 | 1.27 | ||||||||
| 冷凝器排数 | 8 | 8 | 2 | 2 | 2 | ||||||||||
| 每排计算孔数 | N=H'/25.4 | 26 | 26 | 40 | 32 | 32 | |||||||||
| 每排实际孔数 | N' | 40 | 40 | 40 | 32 | 32 | |||||||||
| 单管长度 | m | l=Lt/R/N' | 0.59535916 | 0.776738741 | #REF! | 1.199944823 | 1.270994725 | ||||||||
| 0.18164084 | 0.000261259 | #REF! | -0.001944823 | -0.000994725 | |||||||||||
| 迎风面积 | m2 | 0.325066102 | 0.424099353 | #REF! | 0.975315152 | 1.033064513 | |||||||||
| 计算迎面风速 | m/s | 5.829080118 | 2.488454378 | #REF! | 1.76088818 | 1.654902213 | |||||||||
| -3.299080118 | 0.041545622 | #REF! | -0.002150864 | 0.000392888 | |||||||||||
| 七.风机选型参数确定 | |||||||||||||||
| 换热器阻力 | Pa | ΔPa=9.81×0.0113(L/deq)(ρWmax)^1.7×1.2×1.1 | 80.41 | 80.41 | 16.39 | 16.05 | 14.48 | ||||||||
| 空气横向流过换热器的动压 | Pa | P1=ρv2/2 | 18.35 | 3.34 | #REF! | 1.67 | 1.48 | ||||||||
| 导风圈直径—mm | 590 | 590 | 590 | 590 | 590 | ||||||||||
| 导风圈面积—m2 | 0.2732585 | 0.2732585 | 0.2732585 | 0.2732585 | 0.2732585 | ||||||||||
| 导风圈数量—个 | 1 | 1 | 1 | 1 | 1 | ||||||||||
| 导风圈出风速度—m/s | 6.93 | 3.86 | 6.27 | 6.28 | 6.26 | ||||||||||
| 导风圈出口动压—Pa | 25.933446 | 8.045784 | 21.228966 | 21.296736 | 21.161304 | ||||||||||
| 所选风机动压—Pa | 44.283446 | 11.385784 | #REF! | 22.966736 | 22.641304 | ||||||||||
| 所选风机全压—Pa | 124.693446 | 91.795784 | #REF! | 39.016736 | 37.121304 | ||||||||||
