热交换器原理与设计

,项目,符号,单位,计算公式或数据来源,数值,

1,废水入口温度,t'1,℃,由题意,95.000,

2,废水工作压力,p1,MPa,由题意,0.300,

3,生活水进口温度,t'2,℃,由题意,10.000,

4,生活水出口温度,t''2,℃,由题意,50.000,

5,生活水工作压力,p2,MPa,由题意,0.120,

6,废水流量,M1,kg/s,由题意,6.944,

7,生活水流量,M2,kg/s,由题意,8.194,

8,生活水定性温度,tm2,℃,,30.000,

9,生活水比热,cp2,kJ/(kg•℃),查物性表,4.174,

10,生活水密度,р2,kg/m³,查物性表,995.700,

11,生活水导热系数,λ2,W/(m•℃),查物性表,0.618,

12,生活水黏度,μ2,kg/(m•s),查物性表,0.001,

13,生活水的普兰德数,Pr2,——,,5.413,

14,热损失系数,ηL,——,取用,0.980,

15,传热量,Q,kW,,1368.144,

16,废水比热,cp1,kJ/(kg•℃),查物性表,4.187,

17,废水出口温度,t''1,℃,,46.837,

18,废水定性温度,tm1,℃,,70.918,

19,废水密度,р1,kg/m³,查物性表,977.800,

20,废水导热系数,λ1,W/(m•℃),查物性表,0.668,

21,废水黏度,μ1,kg/(m•s),查物性表,0.0004060,

22,废水的普兰德数,Pr1,——,,2.545,

23,热流体的冷却度,△tmax,℃,t'1-t''1,48.163,

24,冷流体的加热度,△tmin,℃,t''2-t'2,40.000,

25,逆流的对数平均温差,"△t1m,c",℃,(△tmax-△tmin)/ln(△tmax/△tmin),40.782,

26,参数P,,,△tmin/(t'1-t'2),0.471,

27,参数R,,,△tmax/△tmin,1.204,

28,参数S,,,,1.565,

29,温度修正系数ψ,,,查图1.11,0.655,

,温度修正系数ψ,,,查图1.12,0.912,

30,有效平均温差,△tm,℃,,37.193,

31,初选传热系数,K',W/(㎡•℃),查参考资料,310.000,

32,估算传热面积,F',㎡,,118.660,

33,管子的材料及规格,,mm,选用,Φ20╳2.5,

34,管内水的流速,w2,m/s,选用,0.750,

35,管子内径,di,m,,0.016,

36,换热管外径,do,m,查表2.31,0.020,

37,管程所需流通面积,At,㎡,,0.011,

38,每程管数,n,根,,54.000,

39,每根管长,L,m,,34.973,

,选取管长,l,,,9.000,

,管程数,Zt,,,4.000,

40,管子排列方式,,,作图,等边三角形,

41,管中心距,s,mm,查表2.31,26.000,

42,分程隔板槽处管中心距,lE,mm,查表2.31,40.000,

43,平行于流向的管距,sp,mm,,22.517,

44,垂直于流向的管距,sn,mm,,13.000,

45,拉杆直径,,mm,,12.000,

46,六边形层数,a,,,6.000,

47,一台管子数,nt,根,,108.000,

48,一台拉杆数,,根,,4.000,

49,一台传热面积,,㎡,,237.320,

50,两台传热面积,F”,㎡,,474.639,

51,管束中心至最外层管中心距离,,m,,0.224,

52,管束外缘直径,DL,m,,0.468,

53,壳体内径,Ds,m,GB,0.500,

54,长径比,,,,69.946,

55,管程接管直径,D2,mm,,118.370,

56,管程雷诺数,Re2,,,14907.548,

57,管程换热系数,α2,W/(㎡•℃),,3808.100,

58,折流板形式,,,,弓形,

59,折流板缺口高度,h,m,,0.125,

60,折流板的圆心角,θ,,,2.094395102,

61,折流板间距,ls,m,,0.25,

62,折流板数目,Nb,块,,17,

63,折流板上管孔数,,个,查图2.48,116,

64,折流板上管孔直径,dH,m,GB151-1999,0.0254,

65,通过折流板上的管数,,根,查图2.48,112,

66,折流板缺口处管数,,根,查图2.48,24,

67,折流板直径,Db,m,GB151-1999,0.4955,

68,折流板缺口面积,Awg,㎡,,0.038386553,

69,错流区内管数占总管数的百分数,Fc,,,0.646252593,

70,缺口处管子所占面积,Awt,㎡,,0.006001183,

71,流体在缺口处流通面积,Ab,㎡,,0.03238537,

72,流体在两折流板间错流流通截面积,Ac,㎡,,0.008025846,

73,壳程流通截面积,As,㎡,,0.016122034,

74,壳程接管直径,D1,mm,,203,190.1578373

75,错流区管排数,Nc,排,查图2.48,8,

76,每一缺口内的有效错流管排数,Ncw,排,,4.441155917,

77,旁流通道数,NE,,,1,

78,旁流挡板数,Nss,对,选取,3,

79,错流面积中旁流面积占的百分数,Fbp,,,1.619766907,

80,一块折流板上管子与管孔间的泄漏面积,Atb,㎡,,0.030162259,

81,折流板外缘与壳体内壁之间泄漏面积,Asb,㎡,,0.002356194,

82,壳程雷诺数,Re1,,,42623.65024,

83,理想管束传热因子,jH,,查图2.28,0.011,

84,折流板缺口校正因子,jc,,查图2.29,1.01,

85,折流板泄漏校正因子,j1,,查图2.30,0.74,

86,旁路校正因子,jb,,查图2.31,0.94,

87,壳程传热因子,j0,,,0.007728116,

88,壳程质量流速,Gs,kg/(㎡•s),,430.7424392,

89,壳侧壁面温度,tw,℃,假定,45,

90,壁温下废水黏度,μw1,kg/(m•s),查物性表,0.00060135,

91,壳程换热系数,α1,W/(㎡•℃),,7.077421408,

92,水垢热阻,"rs,2",(㎡•℃)/W,查资料,0.00034,

93,废水污垢热阻,"rs,1",(㎡•℃)/W,查资料,0.00017,

94,传热系数,K,W/(㎡•℃),,7.033578143,

95,传热面积,F,㎡,,5.229849427,

96,传热面积之比,F''/F,,,90.755847,

97,检验壳程温度,tw1,℃,,33.91085242,

98,管内摩擦系数,fi,,查图2.35,0.0065,

99,管侧壁温,tw2,℃,假定,45,

100,壁温下热水黏度,μw2,kg/(m•s),,0.00060135,

101,管程总长,L,m,,18,

102,沿程阻力,△Pi,,两台,7868.251606,

103,回弯阻力,△Pr,Pa,两台,4480.65,

104,进出口连接管阻力,△PN,Pa,两台,420.0609375,

105,两台管程总阻力,△Pt,Pa,两台,12768.96254,

106,理想管束摩擦系数,fk,,查图2.36,0.19,

107,理想管束错流段阻力,△Pbk,Pa,,2459.240967,

108,理想管束缺口处阻