您好,欢迎光临河北山依电伴热网站!

   

电伴热管线散热量计算
浏览次数:次    时间:2016-08-22 14:18:37  
电伴热管线散热量计算
  1、查表计算法
  (1) 求单位长度管道标准散热量QbΔT=Tj-T0  Tj (介质工艺温度)T0(环境最低温度)
  根据DN、ΔT、δ三个参数查“表3-1”,可得室外单位长度金属管道的标准热散失量Qb。
  表3-1:管道散热量(Qb)条件:碳钢管道、玻璃纤维保温、室外、风速9m/s。单位:w/m

保温厚度

温差ΔT

管道内径(mm/英寸)Pipeline internal diameter   DN

15

25

40

50

80

100

150

200

250

300

350

400

450

500

600

1/2"

1"

1.5"

2"

3"

4"

6"

8"

10"

12"

14"

16"

18"

20"

24"

10

20

7.2

10.1

13.6

16.4

23.0

28.8

41.1

52.6

64.7

76.1

83.3

94.6

105.9

117.2

139.7

30

11.0

15.4

20.7

24.9

35.0

43.8

62.5

80.0

98.5

115.8

126.7

143.9

161.1

178.3

212.6

40

14.9

20.8

27.9

33.7

47.3

59.2

84.5

108.2

133.2

156.6

171.3

194.6

217.9

241.1

287.4

20

20

4.6

6.2

8.0

9.5

13.0

16.0

22.5

28.5

34.9

40.9

44.7

50.7

56.7

62.6

74.6

30

7.0

9.4

12.2

14.5

19.8

24.4

34.3

43.4

52.2

62.3

68.0

77.1

86.2

95.3

113.4

40

9.5

12.7

16.5

19.6

26.7

33.0

46.3

58.7

71.9

84.2

92.0

104.3

116.6

128.9

153.4

60

14.7

19.6

25.5

30.2

41.2

50.9

71.4

90.5

110.8

129.9

141.8

160.8

179.7

198.7

236.5

25

20

4.1

5.3

6.9

8.1

10.9

13.4

18.6

23.5

28.7

33.5

36.5

41.4

46.2

51.1

60.7

30

6.2

8.1

10.4

12.3

16.6

20.3

28.3

35.7

43.6

51.0

55.6

63.0

70.3

77.7

92.4

40

8.4

11.0

14.1

16.6

22.4

27.5

38.2

48.3

59.0

69.0

75.2

85.2

95.1

105.1

124.9

60

12.9

17.0

21.8

25.6

34.5

42.4

59.0

74.5

90.9

106.3

115.9

131.3

146.7

162.0

192.6

80

17.7

23.3

29.9

35.1

47.4

58.2

81.0

102.3

124.8

146.0

159.2

180.3

201.4

222.4

264.5

100

22.8

30.1

38.6

45.4

61.2

75.2

104.5

132.0

161.1

188.5

205.5

232.8

260.0

287.2

341.5

30

20

3.7

4.8

6.1

7.1

9.5

11.6

15.9

20.0

24.4

28.5

31.0

31.5

39.2

43.2

51.3

30

5.6

7.3

9.2

10.8

14.4

17.6

24.3

30.5

37.1

43.3

47.2

53.4

59.6

65.8

78.1

40

7.6

9.8

12.5

14.6

19.5

23.8

32.8

41.3

50.2

58.6

63.8

72.2

80.6

88.9

105.6

60

11.7

15.1

19.2

22.5

30.0

36.6

50.6

63.6

77.4

90.4

98.4

111.4

124.3

137.1

162.9

80

16.0

20.8

26.4

30.9

41.2

50.3

69.4

87.3

106.3

124.0

135.1

152.9

170.6

188.3

223.6

100

20.7

26.8

34.1

39.8

53.2

65.0

89.7

112.8

137.2

160.2

174.5

197.4

220.3

243.1

288.7

120

25.6

33.2

42.2

49.3

65.9

80.4

111.0

139.6

169.9

198.3

216.1

244.4

272.8

301.0

357.5

140

30.8

40.2

50.8

59.4

79.3

96.8

133.5

168.0

204.4

239.6

259.9

294.0

328.1

362.1

430.1

160

36.2

47.1

59.8

69.9

93.3

113.9

157.2

197.7

240.6

280.8

306.0

346.1

386.2

426.3

506.2

180

42.0

54.5

69.2

80.9

108.1

131.9

182.0

228.9

278.6

325.3

354.2

400.7

447.1

493.5

586.2

40

20

3.2

4.0

5.0

5.8

7.6

9.2

12.6

15.7

19.0

22.1

24.0

27.4

30.2

33.0

39.4

30

4.8

6.1

7.7

8.9

11.6

14.1

19.1

23.9

28.9

33.6

36.6

41.3

45.9

50.6

60.0

40

6.5

8.3

10.4

12.0

15.7

19.0

25.9

32.3

39.1

45.5

49.4

55.8

62.1

68.5

81.1

60

10.1

12.8

16.0

18.5

24.3

29.3

39.9

49.8

60.3

70.1

76.2

86.0

95.8

105.6

125.1

80

13.8

17.6

21.9

25.4

33.3

40.2

54.8

68.4

82.7

96.2

104.6

118.1

131.5

144.9

171.7

100

17.8

22.7

28.3

32.8

43.0

52.0

70.8

88.3

106.8

124.2

135.1

152.4

169.8

187.1

221.7

120

21.1

28.1

35.1

40.6

53.3

64.4

87.6

109.3

132.3

153.9

167.3

188.8

210.3

231.7

274.5

140

26.5

33.8

42.2

48.8

64.1

77.4

105.4

131.5

159.1

185.1

201.2

227.1

252.9

278.7

330.2

160

31.2

39.8

49.7

57.4

75.4

91.1

124.1

154.8

187.3

217.9

236.9

267.3

297.7

328.1

388.7

180

36.2

46.0

57.5

66.5

87.3

105.5

143.7

179.3

216.9

252.2

274.3

309.5

344.7

379.9

450.1

50

20

2.8

3.6

4.4

5.0

6.5

7.8

10.5

13.1

15.7

18.2

19.8

22.3

24.7

27.2

32.2

30

4.3

5.4

6.7

7.7

9.9

11.9

16.0

19.9

23.9

27.7

30.1

33.9

37.6

41.4

48.5

40

5.9

7.3

9.1

10.4

13.4

16.1

21.7

26.9

32.3

37.5

40.7

45.8

50.9

56.0

66.2

60

9.0

11.3

14.0

16.0

20.7

24.8

33.4

41.4

49.9

57.8

62.7

70.6

78.5

86.3

102.1

80

12.4

15.5

19.1

22.0

28.5

34.1

45.9

56.8

68.4

79.3

86.1

96.9

107.7

118.5

140.1

100

16.0

20.1

24.7

28.4

36.7

44.0

59.2

73.4

88.3

102.4

111.1

125.1

139.1

153.0

180.9

120

19.8

24.8

30.6

35.1

45.5

54.4

73.3

90.9

109.4

126.8

137.6

154.9

172.2

189.5

224.0

140

23.8

29.9

36.8

42.3

54.7

65.6

88.2

109.3

131.6

152.5

165.5

186.4

207.2

227.9

269.4

160

28.2

35.2

43.4

49.8

64.4

77.2

103.9

128.7

154.9

179.5

194.9

219.4

243.9

268.3

317.2

180

32.5

40.7

50.2

57.6

74.6

89.4

102.3

149.0

179.4

207.9

225.6

254.0

282.4

310.7

367.2

80

20

2.3

2.8

3.4

3.8

4.8

5.7

7.4

9.0

10.7

12.3

13.3

14.9

16.4

18.0

21.1

30

3.5

4.3

5.2

5.8

7.3

8.6

11.3

13.7

16.3

18.7

20.2

22.6

25.0

27.4

32.1

40

4.8

5.8

7.0

7.9

9.9

11.6

15.2

18.5

22.0

25.3

27.3

30.6

33.8

37.0

43.5

60

7.4

9.0

10.8

12.1

15.3

17.9

23.5

28.6

34.0

39.0

42.1

47.1

52.1

57.1

67.0

80

10.1

12.3

14.8

16.6

20.9

24.6

32.2

39.2

46.6

53.5

54.8

64.7

71.5

78.3

92.0

100

13.0

15.9

19.1

21.5

27.0

31.8

41.6

50.6

60.2

69.1

74.6

83.5

92.3

101.2

118.8

120

16.1

19.7

23.6

26.6

33.5

39.3

51.5

62.7

74.5

85.5

92.4

103.4

114.3

125.3

147.1

140

19.4

23.6

28.4

32.0

40.3

47.3

62.9

75.4

89.6

102.9

111.2

124.4

137.5

150.7

176.9

160

22.9

27.8

33.4

37.7

47.4

55.7

72.9

88.8

105.5

121.1

130.9

146.4

161.9

177.4

208.3

180

26.5

32.2

38.7

43.7

54.9

64.5

84.4

102.8

122.2

140.3

151.5

169.5

187.5

205.4

241.2

 


 


(2) 求单位长度管道的实际热散失量Qs
  计算公式:Qs = K1 · K2 · K3 · Qb ·················· (3-1)Equation Qs = K1 · K2 · K3 · Qb ·················· (3-1)
  式中:Qs ----- 单位长度管道的实际热散失量W/m
     Qb ----- 单位长度管道的标准热散失量W/m
     K1 ----- 保温材料导热系数修正系数值
     K2 ----- 管道材料修正系数

     K3 ----- 环境条件修正系数

表3-2:保温材料导热系数及保温修正系数K1

保温材料

10℃导热系数(W/m· k)

保温修正系数K1

超细玻璃纤维(管壳、棉毡)

0.036

1.0

岩棉(管壳、棉毡)

0.044

1.22

复合硅酸盐

0.035

0.97

聚氨酯泡沫塑料

0.024

0.67

矿渣棉

0.038

1.06

硅酸铝

0.056

1.56

珍珠岩管壳

0.047

1.31

硅酸钙

0.054

1.50

石棉松绳

0.084

2.33

泡沫石棉

0.04~0.048

1.11~1.33

聚乙烯泡沫塑料

0.035

0.97


表3-3: 管道材料修正系数K2
管道材料

修正系数K2

碳钢

1.0

0.9

不锈钢

1.25

塑料

1.5

 


表3-4: 环境条件修正系数K3
环境条件

修正系数K3

室外风速

1.10

室外风速

1.0

室外风速

0.95

室内

0.9