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ID:40354186
大小:101.51 KB
页数:4页
时间:2019-07-31
《循环水自然降温计算》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、循环水池散热计算(1)水面蒸发和传导损失的热量: Qx=α·у(0.0174vf+0.0229)(Pb-Pq)A(760/B) 式中Qx——水池表面蒸发损失的热量(kJ/h); α——热量换算系数,α=4.1868kJ/kcal; у——与水池水温相等的饱和蒸汽的蒸发汽化潜热(kcal/kg); vf——水池水面上的风速(m/s),一般按下列规定采用:室内水池vf=0.2~0.5m/s;露天水池vf=2~3m/s; Pb——与水池水温相等的饱和空气的水蒸汽分压力(mmHg);3.782KPa Pq——水池的环境(23℃)空气的水蒸汽压力(m
2、mHg); A——水池的水表面面积(m2); B——当地的大气压力(mmHg)。(2)加上水池的水表面、池底、池壁、管道和设备等传导所损失的热量: 而水池的水表面、池底、池壁、管道和设备等传导所损失的热量,占水池水表面蒸发损失热量的20%。(3)水池补水加热所需的热量: Qb=αqbу(tr-tb)/t 式中Qb——水池补充水加热所需的热量(kJ/h); α——热量换算系数,α=4.1868(kJ/kcal); qb——水池每日的补充水量(L);按水池水量的5~10%确定; у——水的密度(kg/L); tr——水池水的温度(℃)。
3、tb——水池补充水水温(℃); t——加热时间(h)。(4)水池表面蒸发量的计算:Ws=ψ×(Pq.b-Pa)F×B/B、式中W——水池散湿量(kg/h);ψ——系数,ψ=0.00557×10-5kg/N.s;Pq.b——与水池水温相等的饱和空气的水蒸汽分压力(Pa);Pq——水池的环境空气的水蒸汽压力(Pa);F——水池的水表面面积(m2);B——标准的大气压力(Pa);B、——当地的大气压力(Pa);饱和水蒸气压力表 温度t/℃绝对压强p/kPa水蒸汽的密度ρ/kg·m-3焓H/kJ·kg-1汽化热r/kJ·kg-1 液体水蒸汽00.610
4、.000.002491.102491.1050.870.0120.942500.802479.86101.230.0141.872510.402468.53151.710.0162.802520.502457.70202.330.0283.742530.102446.30253.170.02104.672539.702435.00304.250.03125.602549.302423.70355.620.04146.542559.002412.10407.380.05167.472568.602401.10459.580.07188.412577.802
5、389.405012.340.08209.342587.402378.105515.740.10230.272596.702366.406019.920.13251.212606.302355.106525.010.16272.142615.502343.107031.160.20293.082624.302331.207538.550.24314.012633.502319.508047.380.29334.942642.302307.808557.880.35355.882651.102295.209070.140.42376.812659.9022
6、83.109584.560.50397.752668.702270.50100101.330.60418.682677.002258.40105120.850.70440.032685.002245.40110143.310.83460.972693.402232.00115169.110.96482.322701.302219.00120198.641.12503.672708.902205.20125232.191.30525.022716.402191.80130270.251.49546.382723.902177.60135313.111.72
7、567.732731.002163.30140361.471.96589.082737.702148.70145415.722.24610.852744.402134.00150476.242.54632.212750.702118.50160618.283.25675.752762.902037.10170792.594.11719.292773.302054.001801003.505.15763.252782.502019.301901255.606.38807.642790.101982.402001554.777.84852.012795.50
8、1943.502101917.729.57897.232799.301902.5
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