供热设计说明书

#/29t二18°C,At=95+70-18=64.5°C,K=2.503At0.293=8.49W/m2・°C；n2对于走廊：t二16°C,At=95+70-16=66.5°C,K=8.56W/m2・°C；n2对于餐厅：t二20°C,At=95+70-20=62.5°C,K=8.41W/m2・°C。n2对于楼梯间：t二14°C,At=95+70-14=68.5°C,K=8.64W/m2・°C。n24.2散热器的布置与安装散热器布置布置散热器应符合下列规定：1、散热器宜安装在外墙窗台下,沿散热器上升的对流热气流能阻止和改善从玻璃窗下降的冷气流和玻璃冷辐射的影响,使流经室内的空气比较暖和舒适；2、为防止散热器冻裂,两道外门之间,不应设置散热器。有冻结危险的楼梯间或其它有冻结危险的场所,应由单独的立、支管供暖,且不得装设调节阀；3、散热器一般明装,布置简单,内部装修要求较高的可暗装；4、在垂直单管或双管热水供暖系统中,同一房间的两组散热器可以串联连接；贮藏室、厕所和厨房等辅助用室及走廊的散热器,可同邻室串联连接；5、在楼梯间布置散热器时,考虑楼梯间热流上升的特点,应尽量布置在底层；6、铸铁散热器的组装片数,不宜超过下列数值：粗柱型（包括柱翼型）—20片；细柱型（四柱）—25片；长翼型—7片。散热器组对后,以及整组出厂的散热器在安装之前应做水压试验。散热器安装底部距地面不小于60mm,通常取150mm；顶部距窗台板不小于50mm；背部与墙面净距不小于25mm。本设计采用明装，安装在墙面，上加盖板，A=100mm，即B=1.023同侧连接，上进下出，即02-1.0，管道也明装于供暖房间内，所以管道散热量抵消了水冷却的影响。

4.3散热器的计算4.3.1散热器面积计算散热器散热面积F按参考文献⑵公式2-2计算:QK(t—t)pjn卩卩卩4-1)123式中F——散热器的散热面积（m2）；Q散热器的散热量（W）；K——散热器的传热系数［W/m2・°C］；t——散热器内热媒平均温度（C）；pjt――供暖室内计算温度（C）；n0――散热器组装片数修正系数，查参考文献［2］附录表2-3。计算散热器散1热面积时，由于每组片数或总长度未定，可先假定0=1.0进行计算，计算出F和n的初始值，然后根据每组的片数或长度乘以修正系数01，最后确定散热面积。0――散热器连接方式修正系数，查参考文献⑵附录2-4，0=1.0；220散热器安装形式修正系数，查参考文献［2］附录2-5，0=1.02。以三楼西边典型办公室为例:Q1257F二Q000二——-1.02二2.34肝

K（t—t）12尸38.49-64.5pjn4.3.2散热器片数确定四柱760型散热器每片散热面积为0.235m2,计算片数n为：n=Ff（4-2）同样以西边典型办公室为例：2.34n==9.96q10片0.235查参考文献［2附录2-3的0为1.0，所以西边办公室散热器片数为10片。1

4.3.3散热器计算汇总计算方法同上，计算结果如下表：当散热器片数为6-10时，0为1.0,片数为11-20时，0为1.05时。11先假设0为1.0，当计算片数大于10时，在按0为1.05重新计算，0=1.0，0=1.02，1123散热器每片散热面积为0.235m2。表4.2散热器计算结果楼层房间负荷(W)房间数tn温差(°C)传热系数传热面积片数组数一层餐厅39885.712062.58.4181.2734618x19卫生间115711864.58.492.1591二层餐厅3942312062.58.4180.334218x19卫生间115711864.58.492.1591三、四层西办公室1257121864.58.492.34101南办公室129841864.58.492.41101北办公室1327.111864.58.492.59111西北办公185611864.58.493.63161西南办公210711864.58.494.12181大办公室303511864.58.495.93262x13会议室2834.511864.58.495.54142x12资料室225011864.58.494.4191走廊412011666.58.567.75333x11卫生间115621864.58.492.1591五层西办公室1495121864.58.492.93131南办公室164341864.58.493.21141北办公室140211864.58.492.74121西北办公211111864.58.494.13181西南办公266911864.58.495.22201大办公室361511864.58.497.1302x15

会议室3261.211864.58.496.38282x14资料室234311864.58.494.6201走廊479611666.58.569.02393x13卫生间127421864.58.492.32101各楼梯间1890101468.58.643.42151各层散热器布置情况详见图纸。第五章供暖系统水力计算5.1水力计算方法上述已说明本设计系统分为3区，一二区为水平双管式系统，三区为上供下回双管式系统，所以水力计算也要进行分区计算。采用等温降法进行计算。双管同程式系统最不利循环环路与各并联环路之间的计算压力损失相对差额，不应大于±15%。（1）选择最不利环路；（2）计算通过最不利环路散热器的作用压力；（3）确定最不利环路个管段的管径；（4）确定沿程压力损失和局部阻力损失；（5）求环路压力损失；（6）计算富余压力；（7）确定其他立管及干管管径；（8）求各立管的不平衡率，不平衡率应在±10%以内。5.2一二区水力计算5.2.1一二区水力计算简图如下图：5.1一二区水力计算简图

一二层各有21个散热器，分别用R1、2、321表示；供水干管用IG表示,系统有IG1、2、320、21段供水干管；回水干管用IH表示，系统有IH1、2、3、420.21段回水干管；供水立管用VG表示，回水立管用VH表示；总供水干管用DG表示，总回水干管用DH表示。5.2.2水力计算表表5.1一层水力计算表楼层总阻力(Pa)35749.37最不利环路'一楼层水力计算表编号Q(W)G(kg/h)L(m)D(mm)u(m/s)R(Pa/m)艺gAPy(Pa)APj(Pa)AP(Pa)DG64761.2227.72400.4887.821.17617034529564761.2227.72400.4887.821.176170345DH295IG164761.2227.72320.76179.510359035929IG262871.2162.72.7320.74170.62761714.2122.9IG3274.4320.73164.37172325798059498.2046.7IG4347320.7153.7611076239131557282.1970.5IG5413.3320.68143.481473222695IG655066.1894.23.5251.01388.8415952850.1818.0IG7663.5250.97360.5511262452171450634.1741.8IG8733.5250.93333.2811166415158248418.1665.6IG9817.6320.57105.681803158962IG146202.1589.34.6250.84281.76112963461642098IG1439871513.115.320.5288.811156IG141771.1436.95.9250.76234.3212135IG139555.1360.7250.72212.8447.532IG14而5而6而7而8而9応01而37339.335123.432907.530691.28801.626585.24369.82215.9IH6IH7IH8IH9IH1012345而6189030475262.97478.89694.711910.614126.516342.418558.320774.222990.12520627421.929637.831853.734069.635959.1284.471208.241132.021055.79990.78914.55838.3276.2365.02104.82181.04257.27333.5409.72485.95562.18638.41714.63790.86867.09943.311019.541095.771171.991237.05.156.75.4725.23.53.53.42.7厂3.53.57.64.615.65.957.55.156.75.4725.22525252525252515152020202025252525252532250.680.640.60.560.530.490.450.110.090^50^60^70^70.360.430.490.560.380.420.460.50.540.580.40.661919842261209170.89151.82133.81119.27103.2288.2413.6910.4123.7761.9115.37183.4481.96111.21144.48181.766.2579.4693.77109.125.61143.1256178.36111111145200134519006203613094728両433381642287389109883610334737038427837959271531341149641F32-6F1096288118152708610314216478209205375547640552324664467513494771216988110355880698494787411377IH18IH19IH20IH21638175.540391.462545.364761.211313.241389.462151.562227.793.53.53.47.8253232320.70.480.740.76198.8676.11168.44179.510.669626657314002361102641709323778371570散热器进出水管径D均为15mm。表5.2二层水力计算表楼层总阻力(Pa)25880.62资用压力(Pa)36223二楼层不平衡率12.70%编号Q(W)G(kg/h)L(m)D(mm)u(m/s)R(Pa/m)gAPy(Pa)APj(Pa)AP(Pa)DG443571525.882400.3342.091.58480164DH443571525.882400.3342.091.58480164IG1443571525.884320.81261.510104601046IG2432001486.084.6250.79249.17111463021448IG3410101410.746.9250.75226.591IG4388201335.413.5250.71205.2IG5366301260.073.5250.67184.451646217863IG6344401184.747250.63164.9111541921346IG7322501109.47.6250.59146.37111121681281IG8300601034.063.2250.55128.861412146559IG927870958.7311.45250.51112.39112871261413IG1025680883.397.65250.4796.971742107849IG1123490808.067.33250.4382.6160589695IG12130732.728.7250.3969.281603736762IG13IG14IG15IG16IG17IG18IG19IG20IG21

w巫0191101692014730128401065084606270408018901157^4755377727657.38582.05506.71441.7366.36291.02215.69140.3565.0239.8115.14190.47265.815.528.82.724.9215.83.52.14.66.9IH59917341.147202020202015151515151515IH6；21°416.487.620IH7IH8IH9IH10123而4而142971648718677208672305725247274372962733700.580.510.440.390.320.410.310.20.090.06060^70^80.49191.58153.8119.8793.7367.14143.7584.3539.5610.414.5127.9967.7122.28191.060.3684.38111111058326461106110062952772221193237428641161967350834619651218422534111110903412962622206273497706491.82567.15642.49717.82793.16868.5943.831019.17.181159.53.211.457.657.338.75.528.82.74.921F8202020252525252525亦0.430.50.560.380.420.460.50.540.580.62113.62146.79183.8166.7879.8894.109.26125.53140.39158.5836416811406489695962339691250690120154708612214216145418001560560781108348185226905.3三区水力计算5.3.1三区水力计算简图图5.2三区水力计算简图三区共有18根立管，供水立管用VG表示，回水立管用VH表示；供水干管用BG表示，回水干管用BH表示。5.3.2水力计算表表5.3最不利环路水力计算表

最不利阻力(Pa)13117最不利环路立管9楼层2编号Q(W)G(kg/h)L(m)D(mm)u(m/s)R(Pa/m)gAPy(Pa)APj(Pa)AP(Pa)BG1138284757.01.6500.62101.70163016364133944607.5BG2173.4500.695.531325173498130354484.2BG3518500.5890.591725164889BG4122334208.36.9500.55879BG5114313932.56.9500.5170.9785BG6106303656.712.500.4760.81778109887158BG7951133271.8910.3500.4248.95150487592BG8854312938.836.6500.3839.731262713332647.17.5BG97695383400.57123.86BH1138284757.02.3500.62101.70.2341113458646BH1132614561.94.0500.5993.6913821705527698BH1124594286.1500.5682.9215801507316877BH0.357.04500.5272.811513131644BH1108563734.53.3500.4863.351209114323423BH9.4811.4500.4657.3BH13416.129930637.5500.4453.24139995495BH119037831098.42500.444.32137379452BH12787.715.08103946500.3635.86155963623BH9698112401.57.44400.52101.691757132888VG25192178.63.5150.2695.9233667402

表5.4干管水力计算表□n(W)QDu(m/a)A(pypa)A(pjpA(pa)pOGB44401X5a927725581XGB651X4034a69.662GB242347a8387o549BB1X952383aoo5514GB41X2353ao3695986BB1X532392ao34116GB045273a92.7GB75242a562722928GBO76508O216a399141XHB54344O22a73o59952HB31978O222a66342o933HB95272ao53737834HB89524a977286185HB821X233a285489266HB3a1X2324a738784297HB64093a59.8HB354064a5952o696其余供回水立管水力计算表见水力计算附表。VG38478291.64200.2452.04VH18478291.640.2200.2452.04VH2

"RT5882202.3444.653.5厂150.30.07121.97.21.515VG38478291.64200.2452.04VH18478291.640.2200.2452.04VH2

"RT5882202.3444.653.5厂150.30.07121.97.21.5152610410427

莎40408613144515125.4系统水力计算综合系统最不利环路阻力损失为35749.37Pa，总供回水立管水力计算如下表表5.5总供回水立管号编Q(W)G(kg/h)L(m)D(mm)u(m/s)R(Pa/m)gAPy(Pa)APj(Pa)AP(Pa)VG11382864757.041.6500.62101.71.3163128289VH11339414607.573.4500.695.531325173498VG22280397753.671.3500.4963.981.5190150340VH22280397753.672.3500.4963.981.519173192由于最不利环路阻力损失大于城市管网压力，所以本设计需设置加压水泵即采用机械循环。具体管道管径见图纸。5.5管路压力平衡分析图由于本设计管路系统均为同程式，所以要做管路压力平衡分析图，这里只做三区