某市政務(wù)中心室內(nèi)空調(diào)風(fēng)系統(tǒng)設(shè)計(jì)計(jì)算分析案例目錄TOC\o"1-3"\h\u4456某市政務(wù)中心室內(nèi)空調(diào)風(fēng)系統(tǒng)設(shè)計(jì)計(jì)算分析案例 1150101.1全空氣系統(tǒng) 139281.1.1系統(tǒng)簡(jiǎn)述 1223281.1.2風(fēng)管水力計(jì)算 1184281.2末端設(shè)備選型 533791.3過(guò)渡季節(jié)新風(fēng)校核 51.1全空氣系統(tǒng)本系統(tǒng)的相關(guān)風(fēng)量在附錄C已經(jīng)給出，下面對(duì)于具體的房間進(jìn)行布管設(shè)計(jì)與水力計(jì)算。送回風(fēng)管段的詳細(xì)設(shè)計(jì)說(shuō)明見附圖。全空氣的回風(fēng)不布置專門的管道，只設(shè)一個(gè)回風(fēng)口。1.1.1系統(tǒng)簡(jiǎn)述本建筑大面積的玻璃幕墻設(shè)計(jì)，對(duì)直接引用新風(fēng)的限制較高。一層外部因是與外界聯(lián)通的地下車庫(kù)，不予空調(diào)處理，只做防排煙和通風(fēng).各層大堂辦事空間連通中庭，周圍是用玻璃做出的圍欄，面積與負(fù)荷較大，每層單獨(dú)使用一臺(tái)組合全空氣機(jī)組。由于風(fēng)量較大，將新風(fēng)單獨(dú)由新風(fēng)機(jī)組處理，從北側(cè)上空送入，送風(fēng)由全空氣機(jī)組從中間上送，回風(fēng)則設(shè)在最西側(cè)的上部，整體形成一個(gè)由北向西并經(jīng)過(guò)整個(gè)大堂的類似活塞流的循環(huán)。六層有300人報(bào)告廳，設(shè)一小型全空氣系統(tǒng)，其余的餐廳、休息室，大會(huì)議室均設(shè)置全空氣系統(tǒng)合理布置方形散流器與百葉窗口。1.1.2風(fēng)管水力計(jì)算1.2.1計(jì)算步驟統(tǒng)一規(guī)格（寬高比介于4到10之間）。并根據(jù)選定了的段面尺寸和風(fēng)量，計(jì)算出風(fēng)道里的實(shí)際流速。（5）計(jì)算風(fēng)道的沿程阻力與各管段的局部阻力：沿程阻力：R：?jiǎn)挝荒Σ翂毫:管道長(zhǎng)度局部阻力：ΔPj:管段的局部阻力：局部阻力系數(shù);冷空氣的密度,取1.2Pd:管段動(dòng)壓（6）計(jì)算系統(tǒng)的總阻力與阻力平衡情況。壓力損失總壓力損失（7）匯總結(jié)果，選擇風(fēng)機(jī)。一層新風(fēng)風(fēng)管水力計(jì)算表管段號(hào)風(fēng)量(m3/h)管寬(mm)管高(mm)管長(zhǎng)(m)流速ν(m/s)管道比摩阻R(Pa/m)沿程阻力損失△Py(Pa)局部阻力系數(shù)ξ動(dòng)壓(Pa)局部阻力損失△Pj(Pa)總阻力損失△Py+△Pj(Pa)11603.944002006.221.561.439.162.1018.9339.9249.0621603.944002001.171.561.431.690.0018.930.001.6531470.334002003.611.101.224.49-0.0111.930.004.4341350.3332020010.281.841.7518.330.0420.950.9219.3151164.1232020010.741.031.3614.51-0.0311.560.0014.506571.332001607.484.931.9314.630.1311.011.9616.587317.762001202.313.621.333.223.348.2627.6130.868253.562001202.162.920.901.993.341.2417.6019.549273.832001202.213.111.052.343.066.1318.9121.2210318.962001202.243.631.413.153.068.3121.6628.8011186.141201202.213.531.733.901.117.8140.3344.2612120.011201201.412.300.741.101.113.2316.8017.9113133.601201202.262.530.922.156.114.0324.8327.01小計(jì)1603.8554.3080.66214.73291.39說(shuō)明：（1）原則上，本設(shè)計(jì)的主風(fēng)道設(shè)計(jì)風(fēng)速為6-8m/s，無(wú)風(fēng)口的支風(fēng)管取5~7m/s，有風(fēng)口的支風(fēng)管取2~5m/s。管線的流速依次遞減。根據(jù)計(jì)算出的風(fēng)量和流速來(lái)選擇風(fēng)口尺寸。（2）由于選用鍍鋅鋼管，風(fēng)速在3-13m/s內(nèi)時(shí)，計(jì)算比摩阻時(shí)應(yīng)先乘以其當(dāng)量絕對(duì)粗糙度修正系數(shù)0.95。計(jì)算中已經(jīng)換算，在表中不再體現(xiàn)。（3）風(fēng)管的水力計(jì)算已經(jīng)經(jīng)過(guò)調(diào)整多葉多開雙向調(diào)節(jié)閥后平衡，在后面的附表中已經(jīng)列出。1.1.2.2水力計(jì)算算例以二層的送風(fēng)管段為例：圖5-1二層管段標(biāo)號(hào)示意首先根據(jù)建筑具體情況畫出線路草圖，并對(duì)管段進(jìn)行編號(hào)。此區(qū)域使用的是鍍鋅圓形鋼管，風(fēng)口選用方形散流器。對(duì)管段逐一計(jì)算后，可得如下計(jì)算表格：表5-1二層水力計(jì)算管段編號(hào)流量管徑D流速v長(zhǎng)度l比摩阻沿程損失局部阻力系數(shù)∑ξ局部阻力P1m3/hL/smmm/smPa/mPaPa1519214425007.347.20.997.131.7456.662519214425007.341.60.991.640.228.103519214425007.347.60.997.760.237.454370010284801.682.90.611.80.316.355370010284801.681.70.611.010.234.42633209254801.114.00.512.010.081.24725707194201.193.20.612.070.311.02822106174004.913.10.581.780.314.76918405143804.534.00.532.120.334.071014704113404.544.40.602.750.526.821111203083203.834.00.471.840.312.70127602063002.903.50.31.040.301.57133901032202.703.20.361.20.251.101420905824004.623.00.521.571.1811.21156981903002.753.10.250.81.181.341610692973203.662.80.441.21.189.64176981973002.721.00.261.311.436.47187001943002.7111.40.243.021.14.98193601032202.700.30.370.11.14.81203601032202.703.20.371.271.14.72213601032202.700.50.370.190.10.44223601032202.700.60.370.210.10.44對(duì)比最不利環(huán)路，得出不平衡率之后進(jìn)行校核，對(duì)于不平衡率超出15%的管路進(jìn)行調(diào)節(jié)，增加其風(fēng)管管段上多葉對(duì)開雙向調(diào)節(jié)閥的阻力，在風(fēng)口安裝對(duì)開式多葉調(diào)節(jié)閥，調(diào)節(jié)后的總阻力及不平衡率入如下表：表5-2二層最不利環(huán)路校核環(huán)路構(gòu)成總阻力不平衡率%1-11141.4512.191-12141.4512.191-2-13143.1711.131-2-14143.1711.131-2-3-15156.9512.371-2-3-16156.9512.371-2-3-4-17148.297.951-2-3-4-18148.297.951-2-3-4-5-8-19151.951.681-2-3-4-5-8-20152.06.121-2-3-4-5-8-9-21156.183.051-2-3-4-5-8-9-22157.502.891-2-3-4-5-8-9-10159.570.951-2-3-4-5-6-7161.090.001.1.2.3數(shù)據(jù)匯總相同辦法計(jì)算所有管段，將結(jié)果匯總?cè)缦拢罕?-3全空氣系統(tǒng)水力計(jì)算匯總樓層最不利環(huán)路平衡后總阻力Pa一層1-2-4-6-161.09二層1-2-3-4-5-6-7179.26三層1-2-3-4-5-6-7202.4四層1-2-3-4-5-6-7241.5五層1-2-3-4-5-6-7271.3六層1-2-3-4-5-6-7-8-9-10-11-12-13-27561，41.2末端設(shè)備選型政務(wù)