如何快速估算中央空调水管管径.doc

如何快速估算中央空调水管管径管径计算公式如下： Q(L/s)：管段内流经的水流量 d(mm)：管道内径 v(m/s)：假定的水流速目前设计软件（天正、鸿业）都能直接计算出管径。在水系统中，管内水流速一般按推荐值选用，经试算确定其管径。管内水流速推荐值m/s管径(mm)闭式系统开式系统150.40.50.30.4200.50.60.40.5250.60.70.50.6320.70.90.60.8400.81.00.70.9500.91.20.81.0651.11.40.91.2801.21.61.11.41001.31.81.21.61251.52.01.41.81501.62.21.52.02001.82.51.62.32501.82.61.72.43001.92.91.72.43502.02.81.62.14002.02.81.82.54502.12.81.92.55002.12.81.92.5冷凝水管的设计关于冷凝水管的选择，一般情况下，每1KW的冷负荷每小时产生约0.40.8公斤左右的冷凝水。在潜热负荷较高的场合，每1kW冷负 荷每1h约产生0.8kg冷凝水。通常可以根据机组的冷负荷Q（kW）按下列数据近似选定冷凝水管的公称直径。负荷Q冷凝水管管径Q7KWDN20mmQ=7.117.6KWDN25mmQ17.7100kWDN32mmQ101176kWDN40mmQ177598kWDN50mmQ5991055kWDN80mmQ10561512k DN100mm风机盘管机组、整体式空调器、组合式空调机组等运行过程中产生的冷凝水，必须及时予以排走。排放冷凝水管道的设计，应注意以下事项：1. 沿水流方向，水平管道应保持不小于千分之三的坡度；且不允许有积水部位。 2. 当冷凝水盘位于机组负压区段时，凝水盘的出水口处必须设置水封，水封的高度应比凝水盘处的负压（相当于水柱温度）大50左右。水封的出口，应与大气相通。3. 为了防止冷凝水管道表面产生结露，必须进行防结露验算。采用聚氯乙烯塑料管时，一般可以不必进行防结露的保温和隔汽处理。采用镀锌钢管时，通常应设置保温层。冷量与管径的关系(估算)冷水系统总冷量Q（kw）管径（mm）10-30kw3230-40kw4040-65k5065-120kw80120-210kw100210-410kw125410-750kw150750-1200kw2001200-2500kw250大于2500kw300 中央空调系统冷水管径的选择可参考“管径/流速/流量对照表”管径(DN)流量m/h0.4m/s0.6m/s0.8m/s1.0m/s1.2m/s1.4m/s1.6m/s1.8m/s2.0m/s2.2m/s2.4m/s2.6m/s2.8m/s3.0m/s200.50.70.91.11.41.61.82.02.32.52.72.93.23.4250.71.11.41.82.12.52.83.23.53.94.24.64.95.3321.21.72.32.93.54.14.65.25.86.46.97.58.18.7401.82.73.64.55.46.37.28.19.010.010.911.812.713.6502.84.25.77.18.59.911.312.714.115.617.018.419.821.3654.87.29.611.914.316.719.121.523.926.328.731.133.435.8807.210.914.518.121.725.329.032.636.239.843.447.050.754.310011.317.022.628.333.939.645.250.956.562.267.973.579.284.812517.726.535.344.253.061.970.779.588.497.2106.0114.9123.7132.515025.438.250.963.676.389.1101.9114.5127.2140.0152.7165.4178.1190.920045.267.990.5113.1135.7158.3181.0203.6226.2248.8271.4294.1316.7339.325070.7106.0141.7176.7212.1247.4282.7318.1353.4388.8424.1459.5494.8530.1300101.8152.7203.6254.5305.4356.3407.1458.0508.9559.8610.7661.6712.5763.4350138.5207.8277.1346.4415.6484.9554.2623.4692.7762.0831.3900.5969.81039.1400181.0271.4361.9452.4542.9633.3723.8814.3904.8995.31085.71176.21266.71357.2450229.0343.5458.0572.6687.1801.6916.11030.61145.11259.61374.11488.61603.21717.7500282.7424.1565.5706.9848.2989.6113.01272.31413.71555.11696.5