《水管的水力計算案例綜述》1800字

水管的水力計算案例綜述1.1水管水力計算經(jīng)比較使用假定流速法用來來確定管徑和比摩阻，水管水力計算的一般方法與風管相同。1.2水系統(tǒng)形式的分類1.2.1按照管道的數(shù)目分類兩、三、四管制1.2.2異程式和同程式同程式：為了使水系統(tǒng)穩(wěn)定，流量均勻的分配每個并聯(lián)環(huán)路的管長相等，使環(huán)路的阻力一樣，以至達到平衡的狀態(tài)。異程式:系統(tǒng)相比同程式簡單，安裝方便。但是聯(lián)環(huán)路的管長不相等。水力系統(tǒng)容易損壞，出現(xiàn)泄露的情況，所以支路必須設置調節(jié)流裝置。采用同程式水系統(tǒng)來設計辦公樓。1.2.3水系統(tǒng)的確定水系統(tǒng)形式為：兩管制管道，閉式系統(tǒng)，濟南辦公樓建筑設計1.2.4閉式和開式閉式系統(tǒng)：系統(tǒng)不直接連接大氣，需要單獨的水箱，投資小，開啟時間短，系統(tǒng)簡單，但是膨脹水箱的補水需要加水泵，需要經(jīng)常開啟冷凍機降低能源成本。開式系統(tǒng)：直接連接大氣環(huán)境，可以利用冷水箱的調節(jié)能力，提升調節(jié)能力，由于冷凍水管可以與外界空氣直接碰觸，容易腐蝕管道，且比較耗費能源相比之下投資也大。1.3水管計算1.摩擦壓力損失：(7-1)式中：△Pm：摩擦壓力損失，Pa；λ：摩擦系數(shù)；d：管道當量直徑；l：管道長度；v：熱媒在管道中的流速，（m/s）；ρ：熱媒的密度，（kg/m3）；2.局部壓力損失：(7-2)式中△Pj：局部壓力損失，Pa；ξ:局部阻力系數(shù)管子壓力損失+局部損失總壓力損失(7-3)水力計算取4層為例，見下表4層水力計算表編號Q(W)GL(m)D(mm)υRΣξΔPyΔPjΔP不平衡率FG125020043034.41.141001.38224.261.5256143016850.00%FG223760040867.212.571001.31202.860.732550180543550.00%FG322680039009.63.91001.25185.370.1723788010.00%FG421780037461.61.531001.2171.390.1262723340.00%FG5207000356044.21001.14155.330.1652657180.00%FG6198000340561.11001.09142.550.1157602160.00%FG718720032198.42.571001.03127.920.1329533820.00%FG817640030340.82.931000.97114.080.1334473820.00%FG916560028483.21.851000.91101.030.1186422280.00%FG1015840027244.83.351000.8792.760.1310383480.00%FG1114760025387.21.181000.8181.020.196331290.00%FG1214040024148.84.64801.3278.20.112908513750.00%FG1312960022291.22.6801.2238.250.1619726920.00%FG1411880020433.62.49801.1201.370.1501615620.00%FG15108000185762.77801167.560.1464505140.00%FG169720016718.43.19800.9136.830.1436414770.00%FG178640014860.82.09800.8109.170.1228322600.00%FG187560013003.22.84650.99206.830.1587496370.00%FG196480011145.62.44650.85153.830.1375364120.00%FG205400092883.26650.71108.570.1354253790.00%FG21432007430.42.26500.94253.410.1573446160.00%FG22324005572.82.75500.7146.170.1402254270.00%FG23216003715.23.54400.78250.650.1887319180.00%FH125020043034.41.291001.38224.261.5289143017190.00%FH223760040867.213.411001.31202.860.732720180545260.00%FH322680039009.63.31001.25185.370.1612786900.00%FH421780037461.62.131001.2171.390.1365724370.00%FH5207000356043.61001.14155.330.1559656240.00%FH6198000340561.71001.09142.550.1242603020.00%FH718720032198.41.971001.03127.920.1252533050.00%FH817640030340.83.531000.97114.080.1403474500.00%FH916560028483.21.251000.91101.030.1126421680.00%FH1015840027244.83.941000.8792.760.1366384040.00%FH1114760025387.20.581000.8181.020.14733800.00%FH1214040024148.85.24801.3278.20.114578515420.00%FH1312960022291.22801.2238.250.1476725490.00%FH1411880020433.63.09801.1201.370.1622616830.00%FH15108000185762.17801167.560.1364504140.00%FH169720016718.43.79800.9136.830.1519415590.00%FH178640014860.81.49800.8109.170.1163321950.00%FH187560013003.23.44650.99206.830.1712497610.00%FH196480011145.61.84650.85153.830.1283363190.00%FH205400092883.86650.71108.570.1419254440.00%FH21432007430.41.66500.94253.410.1421444640.00%FH22324005572.83.35500.7146.170.1490255140.00%FH23216003715.22.94400.78250.650.1737317670.00%E1108001857.67.06320.54150.8991066415824264837.60%E29000154811.84320.45107.169.21269412194248820.80%E3126002167.27.46320.63201.99150752154536610.00%E4108001857.67.06320.54150.8991066415824264817.90%E5108001857.67.38320.54150.8991114415824269715.10%E6108001857.67.06320.54150.8991066415824264821.70%E7108001857.67.38320.54150.8991114415824269726.60%E8108001857.67.06320.54150.8991066415824264814.60%E9108001857.67.38320.54150.8991114415824269715.20%E10108001857.67.06320.54150.899106641582426487.80%E11108001857.67.38320.54150.899111441582426978.90%E12108001857.67.06320.54150.8991066415824264812.00%67.38320.54150.8991114415824269717.30%67.06320.54150.8991066415824264823.60%E1572001238.47.44250.56218.7291628417174334536.40%E1672001238.47.44250.56218.7291628417174334537.30%67.06320.54150.8991066415824264817.60%66.38320.54150.899963415824254621.50%E19108001857.67.06320.54150.8991066415824264811.90%E20900015486320.45107.169643410994174210.60%E21108001857.67.56320.54150.899114141582427249.40%E22900015486320.45107.16964341099417427.30%E23108001857.67.56320.54150.8991141415824272413.10%E24126002167.28.98320.63201.9121814523505416315.50%根據(jù)《民用建筑工程設計暖通空調技術措施》空氣調節(jié)水溫度，因此在阻力不平衡偏差值大于15%的管路上加上平衡閥或調節(jié)閥門開度來使得管路的不平衡率滿足要求。水力計算和管路平衡查得管路的不平衡率偏差值不能大于15%，若大于15%需要加閥門調節(jié)。水力計算表詳細見附錄1.4冷凝水管的設計空調設備在運行過程中會產(chǎn)生凝結水，必須及時排走。為了使凝結水順利的排出，在管路設計時應注意以下幾點：1.如受條件限制，無坡度敷設時，管內(nèi)流速不得小于0.25m/s。如不受限凝結水盤的泄水支路坡度，不宜小于0.01。其他水平支干管，沿水流