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File:A digest of the rules for the design of condensers and air pumps (1912) (14596623550).jpg

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Identifier: digestofrulesfor00kran (find matches)
Title: A digest of the rules for the design of condensers and air pumps
Year: 1912 (1910s)
Authors: Krannert, Herman Charles
Subjects: Condensers (Steam) Jet condensers Pumping machinery Theses
Publisher:
Contributing Library: University of Illinois Urbana-Champaign
Digitizing Sponsor: University of Illinois Urbana-Champaign

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garithmic mean - - - - - (5) log _ *3 ?2 Assuming that the heat absorbed by the water is equal to the heat in the steam we have S U T -m S « « W (>> - T + 32) - - - - - - - - - - - (6) W ( - T + 32) ^ 18. 2, The value of U varies with the material of the tube, character ofthe surface, and the velocity of the fluids. The velocity of the water in thetubes is on the average about 50 feet per minute with 150 feet maximum and ^0feet minimum. Ordinarily U is taken as 300 although in special designs withhigh velocity of water and numerous masses the value is pushed from 4^0 to 600. 5. For the arithmetic mean 2T3 - T2 - Tx + T2 - T2 2 2 (T3 - T2) + (T2 - Ti) T2 - Ti - - (4a) Table III gives the values of Tm for temperatures within a practi-cal range shown in Table I for (4). TABLE III T2 - T3 T2 10 15 20 25 15 20 22.5 25 27,5 12 17 19.5 22 24.5 9 14 16.5 19 21,5 6 11 13.6 16 18.5 4 9 11.5 14 16,5 For the logarithmic meanT9 - T, e - T, T2 - Tl loge ( l + lLZlI )T„ - T„ - - (5a) 19.
Text Appearing After Image:
20. Table IV gives the values of T for temperatures within the rangeshown in Table I for (5). TABLE IV *3 h T2 ~ Tl 10 15 20 25 IS 19 f 5 21.6 23.6 25.4 12 16.5 18.5 20.4 22.2 9 13.4 15.3 17.1 18.8 6 10.2 11.9 13.6 15.2 4 7.9 9.6 11.2 12.6 The above value of Tm from (4) and (5) have been plotted in Fig. 5and show the difference in the value for the two methods of calculation. 4. The values of S per pound of condensate were calculated within therange of temperatures shown in Table I using a value of U - 300. These valuesare shown in Table V and are plotted in Pig. 6. TABLE V *3 - T4 T m 6 9 12 35 Vacuum Vacuum Vacuum Vacuum 28 25w 28 oelt 28 ? 28 10 341 348 342 349 343 349 345 350 15 227 232 228 232 229 233 230 234 20 170 174 171 174 172 175 173 175 25 137 139 137 140 138 140 30 115 117

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https://www.flickr.com/photos/internetarchivebookimages/14596623550/

Author Krannert, Herman Charles
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(Reusing this file)		 At the time of upload, the image license was automatically confirmed using the Flickr API. For more information see Flickr API detail.
Flickr tags
InfoField
  • bookid:digestofrulesfor00kran
  • bookyear:1912
  • bookdecade:1910
  • bookcentury:1900
  • bookauthor:Krannert__Herman_Charles
  • booksubject:Condensers__Steam_
  • booksubject:Jet_condensers
  • booksubject:Pumping_machinery
  • booksubject:Theses
  • bookcontributor:University_of_Illinois_Urbana_Champaign
  • booksponsor:University_of_Illinois_Urbana_Champaign
  • bookleafnumber:48
  • bookcollection:university_of_illinois_urbana-champaign
  • bookcollection:americana
Flickr posted date
InfoField
30 July 2014


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