冷卻塔熱力計算書1

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,,YNZT型玻璃鋼雙曲線自然通風冷卻塔,,,,,,三、計算方法,,,,,,,,,,,,,,,,,,,,,,,,,,,

,,,熱力計算書,,,,,冷卻塔的熱力計算采用兩種計算方法，第一種方法為試差法，第二種方法,,,,,,,,,,,,,,,,,,,,,,,,,,,

,,,,,,,,為圖表求解法。,,,,,,,,,,,,,,,,,,,,,,,,,,,

一、已知條件,,,,,,,,1、試差法,,,,,,,,,,,,,,,,,,,,,,,,,,,

1、氣象參數(shù)：,,,干球溫度（θ1）,,31,℃,,,試差法的求解主要是應(yīng)用了冷卻塔熱力計算中的兩個等式，即：,,,,,,,,,,,,,,,,,,,,,,,,,,

,,,濕球溫度（τ）,,28,℃,,,⑴、填料的特性數(shù)N＇等于熱工的交換數(shù)N即N＇-N=0,,,,,,,,,,,,,,,,,,,,,,,,,,

,,,大氣壓力（P0）,,97.7,KPa,,,⑵、冷卻塔的抽力Z等于冷卻塔的阻力ΔP即Z-ΔP=0,,,,,,,,,,,,,,,,,,,,,,,,,,

,,,最大相對濕度（Φ）,,0.798087898,,,,在兩個等式中有兩個變量即出水溫度t2和填料橫截面的風速V,,,,,,,,,,,,,,,,,,,,,,,,,,

2、工況條件：,,,,,,,,試差法計算的所用的公式全部編入計算機的程序，并列出數(shù)次試差的記錄，,,,,,,,,,,,,,,,,,,,,,,,,,,,

,,,循環(huán)水量（Q）,,12000,m3/h,,,其記錄的數(shù)據(jù)列入下表：,,,,,,,,,,,,,,,,,,,,,,,,,,

,,,進水溫度（t1）,,43,℃,,,,,,,,,,,,,,,,,,,,,,,,,,,,,

,,,出水溫度（t2）,,33,℃,,工況,出水溫度,假定風速,特性數(shù),交換數(shù),比較,抽力,阻力,比較,,,,,,,,,,,,,,,,,,,

,,,水溫降（Δt）,,10,℃,,,t2,Vm,N＇,N,N＇-N,Z,ΔP,Z-ΔP,,,,,,,,,,,,,,,,,,,

3、所用冷卻塔的基本參數(shù)：,,,,,,,,1,33.49,1.025,1.229234126,1.229710474,-0.000476349,37.55912907,37.3473103,0.211818777,,,,,,,,,,,,,,,,,,,

,,淋水面積（F1）,,,2400,m2,,2,33,1.05,1.406347448,1.406976672,-0.000629224,38.2888884,39.16977042,-0.880882019,,,,,,,,,,,,,,,,,,,

,,出風口處有效面積（FT）,,,1017,m2,,3,33.38,1.051,1.247223663,1.246384343,0.00083932,37.09225616,36.97182959,0.120426573,,,,,,,,,,,,,,,,,,,

,,進風口高度（H1）,,,4.8,m,,4,32.93,1.066,1.418737391,1.419197625,-0.000460234,37.99620803,38.0087637,-0.012555671,,,,,,,,,,,,,,,,,,,

,,有效高度（H0）,,,68,m,,5,33.21,1.092,1.275216422,1.273431736,0.001784686,40.33881758,39.93382244,0.40499514,,,,,,,,,,,,,,,,,,,

,,進風口平均直徑（Dz）,,,58.4,m,,6,32.75,1.11,1.452413121,1.449642264,0.002770857,41.23439923,41.23604522,-0.001645992,,,,,,,,,,,,,,,,,,,

,,淋水密度（q）,,,5,m3/m2h,,7,32.7,1.095,1.27847933,1.278615811,-0.00013648,40.49155335,40.21801143,0.273541918,,,,,,,,,,,,,,,,,,,

,4、所用淋水填料的特性參數(shù)：,,,,,,,8,32.23,1.109,1.453054448,1.45285045,0.000203998,41.17876813,41.23374518,-0.054977049,,,,,,,,,,,,,,,,,,,

,該冷卻塔采用PVC淋水填料，波形為Z形波，淋水填料的有效高度1米。,,,,,,,9,32.75,1.01,1.354709842,1.351634681,0.003075162,36.3705767,36.04729983,0.323276869,,,,,,,,,,,,,,,,,,,

,a、淋水填料的特征數(shù)N’,,,,N’=1.76λ0.58,,,10,32.28,1.025,1.541515162,1.540910502,0.00060466,37.15840466,37.10507998,0.053324685,,,,,,,,,,,,,,,,,,,

,b、淋水填料的阻力特性ΔP,,,,△P/ρ=AVm,,,11,,,,,,,,,,,,,,,,,,,,,,,,,,,

,,,,,,,,12,,,,,,,,,,,,,,,,,,,,,,,,,,,

二、設(shè)計計算,,,,,,,,采用試差法計算的結(jié)果如下：,,,,,,,,,,,,,,,,,,,,,,,,,,,

1、熱力計算的目的：,,,,,,,,,⑴、出水溫度t2＝32.75℃，（N＇－Ｎ）／N＇＜1.0‰,,,,,,,,,,,,,,,,,,,,,,,,,,

,通過熱力計算求證實際出水溫度t2≤32℃,,,,,,,,⑵、填料處風速Vm＝1.063m/s（Z－ΔP）/Z＜1.0‰,,,,,,,,,,,,,,,,,,,,,,,,,,

,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,

,2、初始參數(shù)：,,,,,,,２、圖表法,,,,,,,,,,,,,,,,,,,,,,,,,,,

,a、干球溫度θ時的進塔空氣密度ρ1,,,,1.078186444,kg/m3,,,圖表法的求解做出三條關(guān)系曲線：,,,,,,,,,,,,,,,,,,,,,,,,,,

,b、進塔空氣焓h1,,,,91.77451216,KJ/kg,,,a、出水溫度t2與風速Vm的關(guān)系曲線，即t2～Vm關(guān)系曲線。,,,,,,,,,,,,,,,,,,,,,,,,,,

,c、進水溫度t1時的飽和空氣焓h1〃,,,,198.9153034,KJ/kg,,,b、冷卻塔抽力Z與風速Vm的關(guān)系曲線，即Z～Vm關(guān)系曲線。,,,,,,,,,,,,,,,,,,,,,,,,,,

,,,,,,,,,c、冷卻塔阻力ΔP與風速Vm的關(guān)系曲線，即ΔP～Vm關(guān)系曲線。,,,,,,,,,,,,,,,,,,,,,,,,,,

,3、所用計算公式：,,,,,,,,求出三條關(guān)系曲線后，以風速Vm為橫坐標將三條關(guān)系曲線畫在坐標圖上。,,,,,,,,,,,,,,,,,,,,,,,,,,

,a、冷卻塔熱力計算基本公式：,,,,,,,,由Z～Vm曲線和ΔP～Vm曲線的交點做直線與t2～Vm曲線相交求出冷卻塔的,,,,,,,,,,,,,,,,,,,,,,,,,,

,N=∫Ｃｄt/h″-h,,,,,,,,出水溫度t2和相的應(yīng)風速Vm。,,,,,,,,,,,,,,,,,,,,,,,,,,

,,N值的計算采用幸普遜兩段積分法，公式如下：,,,,,,,計算步驟：,,,,,,,,,,,,,,,,,,,,,,,,,,

,N=,[（Δt/k6）Cm[1/（h2〃-h1）＋4/（hm〃-hm）＋1/h1〃－h(huán)2）],,,,,,,a、應(yīng)用填料的特性數(shù)N＇等于熱工的交換數(shù)N，即N＇-N=0的關(guān)系式,,,,,,,,,,,,,,,,,,,,,,,,,,

,,h1—為進塔空氣焓,,,,KJ/kg,,,假定風速，用試差法求出t2～Vm關(guān)系曲線。,,,,,,,,,,,,,,,,,,,,,,,,,,

,,h2—為進塔空氣焓,,,,KJ/kg,,,b、假定風速，進行冷卻塔抽力的計算，求出Z～Vm關(guān)系曲線。,,,,,,,,,,,,,,,,,,,,,,,,,,

,,,,,,,,,c、假定風速，進行冷卻塔阻力的計算，求出ΔP～Vm關(guān)系曲線。,,,,,,,,,,,,,,,,,,,,,,,,,,

,,,,,,第1頁,,,,,,,,,第3頁,,,,,,,,,,,,,,,,,,,,

,,,,,,,,,,,,,,,,,,,,,,,,,,,計算參數(shù),計算參數(shù),計算參數(shù),計算參數(shù),logP〃,P〃,計算參數(shù),計算參數(shù),計算參數(shù)

,,hm—為平均空氣焓,,,,KJ/kg,,四、結(jié)論,,,,,,,,,,,,,,,,,,,304.16,0.607927663,0.088792985,69,0.652378041,4.4913618,3,94115.4985,87290.56

,,tm—平均進水溫度,,,tm=(t1+t2)/2,℃,,,,,,,,,,,,,,,,,,,,,301.16,0.64067846,0.093097796,72,0.5773233,3.7785337,阻力系數(shù),47.38638336,計算參數(shù)

,,h1〃—進塔水溫t1時的飽和空氣焓,,,,KJ/kg,,,根據(jù)當?shù)氐臍庀髤?shù)及技術(shù)條件，本工程選用一座YNZT600平方米的,,,,,,,,,,,,,,,,,,計算參數(shù),計算參數(shù),計算參數(shù),計算參數(shù),logP〃,P〃,填料A,1.0135075,0.038086198

,,h2〃—進塔水溫t2時的飽和空氣焓,,,,KJ/kg,,,玻璃鋼雙曲線自然通風冷卻塔。,,,,,,,,,,,,,,,,,,316.16,0.483139836,0.071988161,57,0.936464703,8.639024451,1604.694068,0.097001233,

,,hm〃—進塔水溫tm時的飽和空氣焓,,,,KJ/kg,,,采用兩種計算方法對該冷卻塔進行了熱力計算，計算結(jié)果如下表：,,,,,,,,,,,,,,,,,,平均溫度tm,溫差Δt,絕對溫度T,絕對溫度Tm,氣水比λ,出塔空氣焓h2,平均焓hm,t2飽和焓h2〃,tm飽和焓hm〃

,,,,,,,,,,,試差法,,圖表法,,,,,,,,,,,,,,38.245,9.51,306.65,311.405,0.795701596,144.4505081,118.1125101,122.7192235,156.4506236

,b、所需參數(shù)的計算公式：,,,,,,,,出水溫度t2,,32.75,,31.313,,1‰,,,,,,,,,,,,38,10,306.16,311.16,0.815108952,145.8458113,118.8101617,119.6542933,154.5190134

,⑴、進塔空氣相對濕度的計算公式：,,,,,,,,填料處風速Vm,,1.063,,1.0634,,1‰,,,,,,,,,,,,38.19,9.62,306.54,311.35,0.815885246,143.7416095,117.7580608,122.0250709,156.0150034

,Φ=[（Pτ〃-AP0（θ1-τ）]/Pθ1〃,,,,,,,,用兩種方法計算出的結(jié)果，誤差均在千分之一以內(nèi)。,,,,,,,,,,,,,,,,,,37.965,10.07,306.09,311.125,0.82752966,145.4070527,118.5907824,119.222127,154.2449308

,⑵、進塔干空氣密度：,,,,,,,,實際出水溫度t2=31.32℃,,,,,,,,,,,,,,,,,,38.105,9.79,306.37,311.265,0.84771331,142.6743217,117.2244169,120.9592704,155.3440466

,ρ1=[（P0-ΦPθ1〃）×1000]/[287.14（273+θ1）],,,,,,,,,,,,,,,,,,,,,,,,,,37.875,10.25,305.91,311.035,0.861686606,144.2017516,117.9881319,118.117277,153.5422693

,⑶、飽和空氣的水蒸汽分壓在0～100℃時的計算公式：,,,,,,,,五、其他因素的影響,,,,,,,,,,,,,,,,,,37.85,10.3,305.86,311.01,0.850042193,145.1791789,118.4768455,117.8120098,153.3476265

,lgPt〃=2.0057173-3.142305（1000/T-1000/373.16）,,,,,,,,,,,,,,,,,,,,,,,,,,37.615,10.77,305.39,310.775,0.860910312,146.9111476,119.3428299,114.9768238,151.5294044

,+8.2lg（373.16/T）-0.0024804（373.16-T）,,,,,,,,"1、在干球溫度26.8℃,濕球溫度24℃,相對濕度80％的條件下",,,,,,,,,,,,,,,,,,#REF!,#REF!,#REF!,#REF!,#REF!,#REF!,#REF!,#REF!,#REF!

,⑷、氣水比的計算公式：,,,,,,,,,進水溫度,℃,40,41,42,43,,,,,,,,,,,,37.875,10.25,305.91,311.035,0.784057182,149.3925673,120.5835398,118.117277,153.5422693

,λ=3600ρ1Vm/1000q,,,,,,,,,出水溫度,℃,31.03,31.19,31.32,31.45,,,,,,,,,,,,37.64,10.72,305.44,310.8,0.795701596,151.1527115,121.4636118,115.2755148,151.7218553

,⑸、進塔空氣焓的計算公式：,,,,,,,,,水溫降,Δt,8.97,9.81,10.68,11.55,,,,,,,,,,,,21.5,43,273.16,294.66,0,#DIV/0!,#DIV/0!,9.781856836,64.18913118

,h1=1.006θ1＋（2500＋1.858θ1）×[ΦPθ1〃/（P0-ΦPθ1〃）],,,,,,,,"從上述數(shù)據(jù)中可以看出:在同等的氣象條件下,隨著進水溫度的提高,出水",,,,,,,,,,,,,,,,,,lgPt〃,Pt〃,lgPtm〃,Ptm〃,計算參數(shù)t2,計算參數(shù)tm,計算參數(shù)y1,計算參數(shù)ym,計算參數(shù)y2

,⑹、溫度為t時的飽和空氣焓計算公式：,,,,,,,,"溫度的變化不大,而水溫降隨著進水溫度的提高而增大.",,,,,,,,,,,,,,,,,,0.713407643,5.169013221,0.826874244,6.712344593,0.055862511,0.073772036,0.0323157,0.104334816,0.018360484

,ht〃=1.006t+（2500+1.858t）×[Pt〃/（P0-Pt〃）],,,,,,,,,,,,,,,,,,,,,,,,,,0.701486964,5.0290617,0.821124254,6.624059947,0.054267948,0.072731173,0.035868287,0.112017044,0.018843218

,⑺、出塔空氣焓的計算公式：,,,,,,,,"2、在進水溫度42℃,相對濕度80％的條件下",,,,,,,,,,,,,,,,,,0.710735344,5.13730492,0.825584326,6.692437535,0.055500814,0.073537158,0.033057241,0.104556186,0.018124579

,h2=h1＋（CΔt/kλ）,,,,,,,,,濕球溫度,℃,24,25,26,27,,,,,,,,,,,,0.699780467,5.009339511,0.820301986,6.611530194,0.054043627,0.072583612,0.036433038,0.112188909,0.018688707

,⑻、塔內(nèi)空氣的平均焓計算公式：,,,,,,,,,出水溫度,℃,31.32,31.88,32.45,33.03,,,,,,,,,,,,0.706601135,5.088633056,0.823589797,6.661772491,0.054946096,0.073175551,0.034264461,0.104932814,0.017780628

,hm=（h2＋h1）/2,,,,,,,,,水溫降,Δt,10.68,10.12,9.55,8.97,,,,,,,,,,,,0.695388256,4.958933177,0.818186614,6.579404902,0.053470737,0.072205465,0.037961087,0.112504487,0.018277008

,⑼、出塔空氣干球溫度的計算公式：,,,,,,,,"從上述數(shù)據(jù)中可以看出:在進水溫度和相對濕度一定的條件下,隨著濕球",,,,,,,,,,,,,,,,,,0.694167154,4.945009775,0.817598764,6.570505203,0.053312601,0.072100753,0.038406148,0.114709218,0.018609455

,θ2=θ1＋（tm-θ1）×(h2-h1)/(hm-h1),,,,,,,,"溫度的提高,出水溫度隨著升高,而水溫降隨著進水溫度的提高而降小.",,,,,,,,,,,,,,,,,,0.682666578,4.815779324,0.812067708,6.487355654,0.05184712,0.071123425,0.043099154,0.124275418,0.019229232

,⑽、出塔干空氣密度的計算公式：(設(shè)Φ=1),,,,,,,,,,,,,,,,,,,,,,,,,,#REF!,#REF!,#REF!,#REF!,#REF!,#REF!,#REF!,#REF!,#REF!

,ρ2=[（P0-Pθ2〃）×1000]/[287.14（273+θ2）],,,,,,,,,,,,,,,,,,,,,,,,,,0.695388256,4.958933177,0.818186614,6.579404902,0.053470737,0.072205465,0.037961087,0.121363901,0.020192745

,⑾、平均空氣密度的計算公式：,,,,,,,,,,,,,,,,,,,,,,,,,,0.683891956,4.829386412,0.81265657,6.496157867,0.052001233,0.0712268,0.042551376,0.13219538,0.020936887

,,ρm=（ρ2＋ρ1）/2,,,,,,,,,,,,,,,,,,,,,,,,,-0.214137936,0.610748015,0.408737666,2.562935437,0.006290583,0.0269394,-0.012196214,#DIV/0!,#DIV/0!

,c、冷卻塔抽力的計算公式：,,,,,,,,,,,,,,,,,,,,,,,,,,θ2,計算參數(shù)A2,273.16+θ2,lgPθ〃,Pθ〃,ρ2,ρm,阻力系數(shù),

,,Z=H0g（ρ1-ρ2）,,,,,,,,,,,,,,,,,,,,,,,,,36.9007504,0.814458302,310.0607504,0.79519826,6.240196424,1.027282227,1.052734336,,

,d、冷卻塔阻力的計算公式：,,,,,,,,,,,,,,,,,,,,,,,,,,37.03238669,0.861769527,310.1923867,0.798313946,6.28512539,1.026341849,1.052264146,,

,,ΔP=ξρmVm2/2,,,,,,,,,,,,,,,,,,,,,,,,,36.81632274,0.808946139,309.9763227,0.793198366,6.211526835,1.027884132,1.053035288,,

,,,,,,,,,,,,,,,,,,,,,,,,,,,36.97964049,0.858526991,310.1396405,0.797065863,6.267089015,1.026718935,1.05245269,,

,公式中：,,,,,,,,,,,,,,,,,,,,,,,,,,36.6889381,0.800695018,309.8489381,0.790178573,6.168485859,1.028790484,1.053488464,,

,k=1-t2/［586-0.56（t2-20）],,,,,,,,,,,,,,,,,,,,,,,,,,36.83536278,0.84878004,309.9953628,0.793649488,6.217982396,1.027748475,1.052967459,,

,,C—水的比熱，C=4.187KJ/Kg℃,,,,,,,,,,,,,,,,,,,,,,,,,36.9412614,0.86733743,310.1012614,0.796157432,6.253993588,1.026993075,1.052589759,,

,,,,,,,,,,,,,,,,,,,,,,,,,,,37.10374865,0.922713326,310.2637487,0.800001748,6.309598844,1.025831078,1.052008761,,

,,,,,,,,,,,,,,,,,,,,,,,,,,,#REF!,#REF!,#REF!,#REF!,#REF!,#REF!,#REF!,,

,,,,,,,,,,,,,,,,,,,,,,,,,,,37.41312147,0.932817668,310.5731215,0.807308606,6.416653765,1.023608748,1.050897596,,

,,,,,,,,,,,,,,,,,,,,,,,,,,,37.57695944,0.990505939,310.7369594,0.811171474,6.473981802,1.022426533,1.050306489,,

,,,,,,第2頁,,,,,,,,,第5頁,,,,,,,,,,,,#DIV/0!,#DIV/0!,#DIV/0!,#DIV/0!,#DIV/0!,#DIV/0!,#DIV/0!,,

⑴、假定風速，求t2～Vm關(guān)系曲線,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,

,假定風速為：0.8、1.0、1.2、1.4m/s,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,

,,,,,,,,附圖,,,,,,,,,,,,,,,,,,,,,,,,,,,

,假定風速,出水溫度,氣出比,交換數(shù),填料特征數(shù),比較,結(jié)果,,,,,,,,,,,,,,,,,,,,平均溫度tm,溫差Δt,絕對溫度T,絕對溫度Tm,氣水比λ,出塔空氣焓h2,平均焓hm,t2飽和焓h2〃,tm飽和焓hm〃

,Vm,t2,λ,N,N＇,N-N＇=0,,,,,,,,,,,,,,,,,,,,,21.5,43,273.16,294.66,0,#DIV/0!,#DIV/0!,9.781856836,64.18913118

,,,,,,,,,,,,,,,,,,,,,,,,,,,37.91,10.18,305.98,311.07,0.621035392,164.0205268,127.8975195,118.5458434,153.815164

,0.8,32.82,0.621035392,1.647710953,1.183401408,0.464309545,0.281790653,,,,,,,,,,,,,,,,,,,,37.32,11.36,304.8,310.48,0.77629424,156.2707578,124.022635,111.5038652,149.2758813

,1,31.64,0.77629424,1.940382537,1.346914069,0.593468468,0.305851273,,,,,,,,,,,,,,,,,,,,36.84,12.32,303.84,310,0.931553088,150.0633727,120.9189424,106.0505433,145.6766806

,1.2,30.68,0.931553088,2.281301168,1.497148957,0.784152211,0.343730246,,,,,,,,,,,,,,,,,,,,,,,,,,,,

,,,,,,,,,,,,,,,,,,,,,,,,,,,lgPt〃,Pt〃,lgPtm〃,Ptm〃,計算參數(shù)t2,計算參數(shù)tm,計算參數(shù)y1,計算參數(shù)ym,計算參數(shù)y2

采用試差法計算的結(jié)果如下：,,,,,,,,,,,,,,,,,,,,,,,,,,,-0.214137936,0.610748015,0.408737666,2.562935437,0.006290583,0.0269394,-0.012196214,#DIV/0!,#DIV/0!

,風速Vm（m/s）,,,,0.8,1,1.2,,,,,,,,,,,,,,,,,,,,0.697097036,4.978483089,0.819009424,6.591881993,0.053692856,0.072352301,0.037353391,0.154335013,0.028657584

,出水溫度t2（℃）,,,,32.82,31.64,30.68,,,,,,,,,,,,,,,,,,,,0.668172601,4.657711677,0.805110979,6.384266077,0.050060158,0.069914196,0.050685899,0.158395477,0.023449658

,,,,,,,,,,,,,,,,,,,,,,,,,,,0.6444524,4.410140239,0.79375935,6.219555534,0.047273522,0.067987815,0.070047479,0.161565647,0.02047002

⑵、假定風速，求Z～Vm關(guān)系曲線,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,

,,,,,,,,,,,,,,,,,,,,,,,,,,,計算參數(shù)A2,273.16+θ2,lgPt〃,Pt〃,,,,,

,假定風速,進塔空氣密度出塔干球溫度,,,出塔空氣密度,冷卻塔抽力,,,,,,,,,,,,,,,,,,,,,#DIV/0!,273.16,-0.214137936,0.610748015,,填料阻力系數(shù)A,,1.0135075,

,Vm,ρ1,,θ2,ρ2,,Z,,,,,,,,,,,,,,,,,,,,1.164494771,312.2066589,0.845616887,7.00836782,,塔體阻力系數(shù)ξ,,47.38638336,

,,,,,,,,,,,,,,,,,,,,,,,,,,,1.12164713,311.2488099,0.823209754,6.655945447,,,,,

,0.8,1.078186444,,39.04665887,1.011652004,,44.33855105,,,,,,,,,,,,,,,,,,,,1.081382479,310.4752737,0.8049994,6.382626038,,,,,

,1,1.078186444,,38.08880986,1.018708619,,39.6360227,,,,,,,,,,,,,,,,,,,,,,,,,,,,

,1.2,1.078186444,,37.31527368,1.024312529,,35.90157681,,,,,,,,,,,,,,,,,,,,,,,,,,,,

,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,

冷卻塔抽力計算的結(jié)果如下：,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,

,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,

,風速Vm（m/s）,,,,0.8,1,1.2,,,,,,,,,,,,,,,,,,,,,,,,,,,,

,抽力Z（KPa）,,,,44.34,39.64,35.90,,,,,,,,,,,,,,,,,,,,,,,,,,,,

,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,

⑶、假定風速，求ΔP～Vm關(guān)系曲線,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,

,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,

,假定風速,平均空氣密度填料通風阻力,,,其余通風阻力,,總阻力,,,,,,,,,,,,,,,,,,,,,,,,,,,,

,Vm,ρm,,ΔP1,ΔP2,,ΔP,,,,,,,,,,,,,,,,,,,,,,,,,,,,

,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,

,0.8,1.044919224,,6.642257927,15.84478174,,22.48703966,,,,,,,,,,,,,,,,,,,,,,,,,,,,

,1,1.048447532,,10.41357248,24.84106833,,35.25464081,,,,,,,,,,,,,,,,,,,,,,,,,,,,

,1.2,1.051249487,,15.03561966,35.86673606,,50.90235572,,,,,,,,,,,,,,,,,,,,,,,,,,,,

,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,

冷卻塔阻力計算的結(jié)果如下：,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,

,風速Vm（m/s）,,,,0.8,1,1.2,,,,,,,,,,,,,,,,,,,,,,,,,,,,

,阻力ΔP（KPa）,,,,22.49,35.25,50.90,,,,,,,,,,,,,,,,,,,,,,,,,,,,

,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,

⑷、用求出的t2～VmZ～VmΔP～Vm三條關(guān)系曲線作圖，見附圖。,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,

⑸、采用圖表法計算的結(jié)果如下：,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,

,a、出水溫度t2＝31.753℃,,,,b、填料處風速Vm＝1.0634m/s,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,

,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,

,,,,,,第4頁,,,,,,,,第6頁,,,,,,,,,,,,,,,,,,,,,

,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,

,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,

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