熱交換器原理與設計

,項目,符號,單位,計算公式或數據來源,數值,

1,廢水入口溫度,t'1,℃,由題意,95.000,

2,廢水工作壓力,p1,MPa,由題意,0.300,

3,生活水進口溫度,t'2,℃,由題意,10.000,

4,生活水出口溫度,t''2,℃,由題意,50.000,

5,生活水工作壓力,p2,MPa,由題意,0.120,

6,廢水流量,M1,kg/s,由題意,6.944,

7,生活水流量,M2,kg/s,由題意,8.194,

8,生活水定性溫度,tm2,℃,,30.000,

9,生活水比熱,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,生活水導熱系數,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,生活水的普蘭德數,Pr2,——,,5.413,

14,熱損失系數,ηL,——,取用,0.980,

15,傳熱量,Q,kW,,1368.144,

16,廢水比熱,cp1,kJ/(kg?℃),查物性表,4.187,

17,廢水出口溫度,t''1,℃,,46.837,

18,廢水定性溫度,tm1,℃,,70.918,

19,廢水密度,р1,kg/m3,查物性表,977.800,

20,廢水導熱系數,λ1,W/(m?℃),查物性表,0.668,

21,廢水黏度,μ1,kg/(m?s),查物性表,0.0004060,

22,廢水的普蘭德數,Pr1,——,,2.545,

23,熱流體的冷卻度,△tmax,℃,t'1-t''1,48.163,

24,冷流體的加熱度,△tmin,℃,t''2-t'2,40.000,

25,逆流的對數平均溫差,"△t1m,c",℃,(△tmax-△tmin)/ln(△tmax/△tmin),40.782,

26,參數P,,,△tmin/(t'1-t'2),0.471,

27,參數R,,,△tmax/△tmin,1.204,

28,參數S,,,,1.565,

29,溫度修正系數ψ,,,查圖1.11,0.655,

,溫度修正系數ψ,,,查圖1.12,0.912,

30,有效平均溫差,△tm,℃,,37.193,

31,初選傳熱系數,K',W/(㎡?℃),查參考資料,310.000,

32,估算傳熱面積,F',㎡,,118.660,

33,管子的材料及規(guī)格,,mm,選用,Φ20╳2.5,

34,管內水的流速,w2,m/s,選用,0.750,

35,管子內徑,di,m,,0.016,

36,換熱管外徑,do,m,查表2.31,0.020,

37,管程所需流通面積,At,㎡,,0.011,

38,每程管數,n,根,,54.000,

39,每根管長,L,m,,34.973,

,選取管長,l,,,9.000,

,管程數,Zt,,,4.000,

40,管子排列方式,,,作圖,等邊三角形,

41,管中心距,s,mm,查表2.31,26.000,

42,分程隔板槽處管中心距,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,拉桿直徑,,mm,,12.000,

46,六邊形層數,a,,,6.000,

47,一臺管子數,nt,根,,108.000,

48,一臺拉桿數,,根,,4.000,

49,一臺傳熱面積,,㎡,,237.320,

50,兩臺傳熱面積,F”,㎡,,474.639,

51,管束中心至最外層管中心距離,,m,,0.224,

52,管束外緣直徑,DL,m,,0.468,

53,殼體內徑,Ds,m,GB,0.500,

54,長徑比,,,,69.946,

55,管程接管直徑,D2,mm,,118.370,

56,管程雷諾數,Re2,,,14907.548,

57,管程換熱系數,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,折流板的圓心角,θ,,,2.094395102,

61,折流板間距,ls,m,,0.25,

62,折流板數目,Nb,塊,,17,

63,折流板上管孔數,,個,查圖2.48,116,

64,折流板上管孔直徑,dH,m,GB151-1999,0.0254,

65,通過折流板上的管數,,根,查圖2.48,112,

66,折流板缺口處管數,,根,查圖2.48,24,

67,折流板直徑,Db,m,GB151-1999,0.4955,

68,折流板缺口面積,Awg,㎡,,0.038386553,

69,錯流區(qū)內管數占總管數的百分數,Fc,,,0.646252593,

70,缺口處管子所占面積,Awt,㎡,,0.006001183,

71,流體在缺口處流通面積,Ab,㎡,,0.03238537,

72,流體在兩折流板間錯流流通截面積,Ac,㎡,,0.008025846,

73,殼程流通截面積,As,㎡,,0.016122034,

74,殼程接管直徑,D1,mm,,203,190.1578373

75,錯流區(qū)管排數,Nc,排,查圖2.48,8,

76,每一缺口內的有效錯流管排數,Ncw,排,,4.441155917,

77,旁流通道數,NE,,,1,

78,旁流擋板數,Nss,對,選取,3,

79,錯流面積中旁流面積占的百分數,Fbp,,,1.619766907,

80,一塊折流板上管子與管孔間的泄漏面積,Atb,㎡,,0.030162259,

81,折流板外緣與殼體內壁之間泄漏面積,Asb,㎡,,0.002356194,

82,殼程雷諾數,Re1,,,42623.65024,

83,理想管束傳熱因子,jH,,查圖2.28,0.011,

84,折流板缺口校正因子,jc,,查圖2.29,1.01,

85,折流板泄漏校正因子,j1,,查圖2.30,0.74,

86,旁路校正因子,jb,,查圖2.31,0.94,

87,殼程傳熱因子,j0,,,0.007728116,

88,殼程質量流速,Gs,kg/(㎡?s),,430.7424392,

89,殼側壁面溫度,tw,℃,假定,45,

90,壁溫下廢水黏度,μw1,kg/(m?s),查物性表,0.00060135,

91,殼程換熱系數,α1,W/(㎡?℃),,7.077421408,

92,水垢熱阻,"rs,2",(㎡?℃)/W,查資料,0.00034,

93,廢水污垢熱阻,"rs,1",(㎡?℃)/W,查資料,0.00017,

94,傳熱系數,K,W/(㎡?℃),,7.033578143,

95,傳熱面積,F,㎡,,5.229849427,

96,傳熱面積之比,F''/F,,,90.755847,

97,檢驗殼程溫度,tw1,℃,,33.91085242,

98,管內摩擦系數,fi,,查圖2.35,0.0065,

99,管側壁溫,tw2,℃,假定,45,

100,壁溫下熱水黏度,μw2,kg/(m?s),,0.00060135,

101,管程總長,L,m,,18,

102,沿程阻力,△Pi,,兩臺,7868.251606,

103,回彎阻力,△Pr,Pa,兩臺,4480.65,

104,進出口連接管阻力,△PN,Pa,兩臺,420.0609375,

105,兩臺管程總阻力,△Pt,Pa,兩臺,12768.96254,

106,理想管束摩擦系數,fk,,查圖2.36,0.19,

107,理想管束錯流段阻力,△Pbk,Pa,,2459.240967,

108,理想管束缺口處阻