排烟设计计算表

排烟设计计算,,,,,,,,,

序号,计算项目,符号表示,参数来源,计算公式,国际单位,计算结果,参数说明,规范依据,其他说明

一、基础设计参数,,,,,,,,,

1,防烟分区面积,A_smoke,设计值,A_smoke=500,m²,500,防烟分区面积,GB51251-2017,防烟分区面积500m²

2,空间净高,H,设计值,H=4,m,4,空间净高,GB51251-2017,空间净高4m

3,空气密度,rho_air,查表值,查空气性能表,kg/m³,1.2,空气密度,GB51251-2017,常温空气密度

4,空气动力粘度,mu_air,查表值,查空气性能表,Pa·s,0.0000181,空气动力粘度,GB51251-2017,常温空气动力粘度

5,重力加速度,g,常数,g=9.81,m/s²,9.81,重力加速度,物理常数,标准重力加速度

6,环境温度,T0,设计值,T0=20,℃,20,环境温度,GB51251-2017,环境温度20℃

7,烟气温度,T,设计值,T=120,℃,120,烟气温度,GB51251-2017,烟气温度120℃

8,环境空气密度,rho0,查表值,查空气性能表,kg/m³,1.2,环境空气密度,GB51251-2017,环境空气密度

9,质量流量,M_rho,设计值,M_rho=0.5,kg/s,0.5,质量流量,GB51251-2017,烟气质量流量

10,排烟位置系数,gamma,查表值,查规范,-,1,排烟位置系数,GB51251-2017,排烟位置系数1.0

11,烟气层厚度,db,设计值,db=2.0,m,2,烟气层厚度,GB51251-2017,烟气层厚度2.0m

12,年运行时间,t_year,设计值,t_year=8760,h,8760,年运行时间,化工设计规范,全年运行时间

13,环境湿度,RH,设计值,RH=60,%,60,环境湿度,GB51251-2017,年平均环境湿度

14,地震烈度,Seismic,设计值,7,度,7,地震烈度,GB50011-2010,7度抗震设防

15,设计使用年限,T_design,设计值,T_design=50,年,50,设计使用年限,GB51251-2017,设计使用年限50年

16,防火等级,Fire_grade,设计值,二级,-,二级,防火等级,GB50016-2014,二级防火

17,通风方式,Vent_method,选用值,机械排烟,-,机械排烟,通风方式,GB51251-2017,机械排烟

18,排烟材料,Exhaust_material,选用值,镀锌钢板,-,镀锌钢板,排烟材料,GB51251-2017,镀锌钢板

二、防烟分区设计,,,,,,,,,

19,防烟分区长度,L_smoke,设计值,L_smoke=25,m,25,防烟分区长度,GB51251-2017,防烟分区长度25m

20,防烟分区宽度,W_smoke,设计值,W_smoke=20,m,20,防烟分区宽度,GB51251-2017,防烟分区宽度20m

21,防烟分区面积,A_smoke_calc,计算值,A_smoke_calc=L_smoke*W_smoke,m²,500,防烟分区面积,GB51251-2017,面积计算

22,防烟分区面积限值,A_smoke_limit,查表值,查规范,m²,500,防烟分区面积限值,GB51251-2017,净高≤6m时限值500m²

23,面积校核,Judge_A_s,判断值,"IF(A_smoke_calc≤A_smoke_limit,""满足"",""不满足"")",-,满足,面积是否符合要求,GB51251-2017,500≤500，满足要求

24,防烟分区长度限值,L_smoke_limit,查表值,查规范,m,36,防烟分区长度限值,GB51251-2017,净高≤6m时限值36m

25,长度校核,Judge_L_s,判断值,"IF(L_smoke≤L_smoke_limit,""满足"",""不满足"")",-,满足,长度是否符合要求,GB51251-2017,25≤36，满足要求

26,最小清晰高度,Hq,计算值,Hq=1.6+0.1*H,m,2,最小清晰高度,GB51251-2017,最小清晰高度计算

27,清晰高度校核,Judge_Hq,判断值,"IF(Hq≤H,""满足"",""不满足"")",-,满足,清晰高度是否符合要求,GB51251-2017,2.0≤4.0，满足要求

三、排烟量计算,,,,,,,,,

28,单位面积排烟量,q_smoke,查表值,查规范,m³/(h·m²),60,单位面积排烟量,GB51251-2017,净高≤6m时取60

29,计算排烟量,V_smoke_calc,计算值,V_smoke_calc=q_smoke*A_smoke,m³/h,30000,计算排烟量,GB51251-2017,排烟量计算

30,最小排烟量,V_smoke_min,查表值,查规范,m³/h,15000,最小排烟量,GB51251-2017,最小排烟量15000m³/h

31,设计排烟量,V_smoke_design,计算值,"V_smoke_design=max(V_smoke_calc,V_smoke_min)",m³/h,30000,设计排烟量,GB51251-2017,取最大值

32,体积流量,Q_smoke,计算值,Q_smoke=V_smoke_design/3600,m³/s,8.333,体积流量,GB51251-2017,体积流量计算

33,排烟口最大允许排烟量,Vmax,计算值,Vmax=4.16*gamma*db**2.5*sqrt((T-T0)/T0),m³/s,11.77,排烟口最大允许排烟量,GB51251-2017,最大排烟量计算

34,排烟量校核,Judge_V_s,判断值,"IF(Q_smoke≤Vmax,""满足"",""不满足"")",-,满足,排烟量是否符合要求,GB51251-2017,8.333≤11.77，满足要求

35,自然排烟窗面积,A_natural,计算值,A_natural=0.02*A_smoke,m²,10,自然排烟窗面积,GB51251-2017,自然排烟窗面积计算

36,自然排烟窗面积校核,Judge_A_n,判断值,"IF(A_natural≥10,""满足"",""不满足"")",-,满足,自然排烟窗面积是否符合要求,GB51251-2017,10≥10，满足要求

四、排烟管道设计,,,,,,,,,

37,管道长度,L_pipe,设计值,L_pipe=20,m,20,管道长度,GB51251-2017,管道长度20m

38,管道直径,D_pipe,选用值,D_pipe=0.5,m,0.5,管道直径,GB51251-2017,管道直径0.5m

39,管道壁厚,t_pipe,选用值,t_pipe=0.5,mm,0.5,管道壁厚,GB51251-2017,镀锌钢板壁厚0.5mm

40,管道截面面积,A_pipe,计算值,A_pipe=pi*(D_pipe/2)**2,m²,0.1963,管道截面面积,GB51251-2017,截面面积计算

41,管道风速,v_pipe_calc,计算值,v_pipe_calc=Q_smoke/A_pipe,m/s,42.44,管道风速,GB51251-2017,风速计算

42,风速限值,v_pipe_limit,查表值,查规范,m/s,20,风速限值,GB51251-2017,金属管道风速限值20m/s

43,风速校核,Judge_v_p,判断值,"IF(v_pipe_calc≤v_pipe_limit,""满足"",""不满足"")",-,不满足,风速是否符合要求,GB51251-2017,42.44>20，需要调整管径

44,雷诺数,Re,计算值,Re=rho_air*v_pipe_calc*D_pipe/mu_air,-,1408000,雷诺数,GB51251-2017,雷诺数计算

45,沿程阻力系数,lambda_pipe,查表值,查莫迪图,-,0.02,沿程阻力系数,GB51251-2017,沿程阻力系数

46,沿程阻力,delta_p,计算值,delta_p=lambda_pipe*(L_pipe/D_pipe)*(rho_air*v_pipe_calc**2/2),Pa,434,沿程阻力,GB51251-2017,沿程阻力计算

47,局部阻力,delta_p_local,计算值,delta_p_local=0.3*(rho_air*v_pipe_calc**2/2),Pa,323,局部阻力,GB51251-2017,局部阻力计算

48,总阻力,delta_p_total,计算值,delta_p_total=delta_p+delta_p_local,Pa,757,总阻力,GB51251-2017,总阻力计算

五、排烟口设计,,,,,,,,,

49,排烟口数量,n_exhaust,设计值,n_exhaust=2,个,2,排烟口数量,GB51251-2017,排烟口数量2个

50,单个排烟口面积,A_exhaust,设计值,A_exhaust=0.25,m²,0.25,单个排烟口面积,GB51251-2017,单个排烟口面积0.25m²

51,排烟口总面积,A_exhaust_total,计算值,A_exhaust_total=n_exhaust*A_exhaust,m²,0.5,排烟口总面积,GB51251-2017,总面积计算

52,排烟口风速,v_exhaust,计算值,v_exhaust=Q_smoke/A_exhaust_total,m/s,16.67,排烟口风速,GB51251-2017,风速计算

53,排烟口风速限值,v_exhaust_limit,查表值,查规范,m/s,10,排烟口风速限值,GB51251-2017,排烟口风速限值10m/s

54,风速校核,Judge_v_e,判断值,"IF(v_exhaust≤v_exhaust_limit,""满足"",""不满足"")",-,不满足,风速是否符合要求,GB51251-2017,16.67>10，需要调整面积

55,排烟口间距,s_exhaust,设计值,s_exhaust=10,m,10,排烟口间距,GB51251-2017,排烟口间距10m

56,最小间距,s_exhaust_min,计算值,s_exhaust_min=0.9*sqrt(Q_smoke/n_exhaust),m,1.84,最小间距,GB51251-2017,最小间距计算

57,间距校核,Judge_s_e,判断值,"IF(s_exhaust≥s_exhaust_min,""满足"",""不满足"")",-,满足,间距是否符合要求,GB51251-2017,10≥1.84，满足要求

58,排烟口边距,e_exhaust,设计值,e_exhaust=2,m,2,排烟口边距,GB51251-2017,排烟口边距2m

59,边距校核,Judge_e_e,判断值,"IF(e_exhaust≥1.5,""满足"",""不满足"")",-,满足,边距是否符合要求,GB51251-2017,2≥1.5，满足要求

六、排烟风机设计,,,,,,,,,

60,风机风量,Q_fan,计算值,Q_fan=V_smoke_design*1.1,m³/h,33000,风机风量,GB51251-2017,风量计算，1.1为余量系数

61,风机风压,P_fan,计算值,P_fan=delta_p_total*1.2,Pa,908.4,风机风压,GB51251-2017,风压计算，1.2为余量系数

62,风机功率,N_fan,计算值,N_fan=Q_fan/3600*P_fan/1000/0.8,kW,10.37,风机功率,GB51251-2017,功率计算，0.8为效率

63,风机转速,n_fan,选用值,n_fan=1450,r/min,1450,风机转速,GB51251-2017,风机转速1450r/min

64,风机耐温,T_fan,设计值,T_fan≥280,℃,280,风机耐温,GB51251-2017,风机耐温280℃

65,耐温校核,Judge_T_f,判断值,"IF(T_fan≥T+50,""满足"",""不满足"")",-,满足,耐温是否符合要求,GB51251-2017,280≥170，满足要求

66,风机连续运行时间,t_fan,设计值,t_fan≥30,min,30,风机连续运行时间,GB51251-2017,连续运行时间30min

67,运行时间校核,Judge_t_f,判断值,"IF(t_fan≥30,""满足"",""不满足"")",-,满足,运行时间是否符合要求,GB51251-2017,30≥30，满足要求

七、自然排烟设计,,,,,,,,,

68,自然排烟窗面积,A_window,设计值,A_window=10,m²,10,自然排烟窗面积,GB51251-2017,自然排烟窗面积10m²

69,自然排烟窗开启角度,alpha_window,设计值,alpha_window=70,°,70,自然排烟窗开启角度,GB51251-2017,开启角度70°

70,有效面积系数,C_v,查表值,查规范,-,0.6,有效面积系数,GB51251-2017,开启角度70°时系数0.6

71,有效面积,A_window_eff,计算值,A_window_eff=A_window*C_v,m²,6,有效面积,GB51251-2017,有效面积计算

72,有效面积要求,A_window_req,计算值,A_window_req=0.02*A_smoke,m²,10,有效面积要求,GB51251-2017,有效面积要求10m²

73,有效面积校核,Judge_A_w,判断值,"IF(A_window_eff≥A_window_req,""满足"",""不满足"")",-,不满足,有效面积是否符合要求,GB51251-2017,6.0<10，需要增大面积

74,自然排烟窗高度,H_window,设计值,H_window=3.5,m,3.5,自然排烟窗高度,GB51251-2017,排烟窗高度3.5m

75,高度校核,Judge_H_w,判断值,"IF(H_window≥H-0.5,""满足"",""不满足"")",-,满足,高度是否符合要求,GB51251-2017,3.5≥3.5，满足要求

八、阻力计算,,,,,,,,,

76,沿程阻力,delta_p_friction,计算值,delta_p_friction=delta_p,Pa,434,沿程阻力,GB51251-2017,沿程阻力计算

77,弯头阻力,delta_p_elbow,计算值,delta_p_elbow=0.5*(rho_air*v_pipe_calc**2/2),Pa,538.3,弯头阻力,GB51251-2017,弯头阻力计算

78,变径阻力,delta_p_reducer,计算值,delta_p_reducer=0.2*(rho_air*v_pipe_calc**2/2),Pa,215.3,变径阻力,GB51251-2017,变径阻力计算

79,阀门阻力,delta_p_valve,计算值,delta_p_valve=0.3*(rho_air*v_pipe_calc**2/2),Pa,323,阀门阻力,GB51251-2017,阀门阻力计算

80,出口阻力,delta_p_outlet,计算值,delta_p_outlet=1.0*(rho_air*v_pipe_calc**2/2),Pa,1076.6,出口阻力,GB51251-2017,出口阻力计算

81,总阻力,delta_p_total_calc,计算值,del