To ask an engineering question please visit our forum site at Eng-Tips.



Browse our archive of questions and answers below or to access our old forum database of over 10000 questions and answers please visit the old Ask@ forum.


Forums > Engineering Questions and Answers > Student Questions
Tunnel Air pressure calculation, Subway Environmental Design Guide
Last Post 21 Jul 2015 08:29 PM by Bruce Norris. 2 Replies.
AddThis - Bookmarking and Sharing Button Printer Friendly
  •  
  •  
  •  
  •  
  •  
Sort:
PrevPrev NextNext
You are not authorized to post a reply.
Author Messages Not Resolved
Wesley Fan
New Member
New Member
Posts:1

--
01 Oct 2013 10:14 AM
    Hi,

    I am currently using Subway Enviornmental Design Handbook from 1974. I am following the design sample within the book and have found out that some of the calculation do not make any sense.

    In section 3-91, the ß(T) values provided by the book on the Post Portal Transient look amusing since the equations provided do not dervie the same answer as indicated in the table.

    I was using the equations as shown in the attachments below




    I have no idea why 0.137 can be achieved for ß(T) whem T = 20.

    ß(T) = 0.080 is from Portal Entry calculation.

    Can someone give me a hand on what can be happened?
    RK Gupta
    New Member
    New Member
    Posts:1

    --
    09 Jul 2015 03:10 AM
    Dear friend
    Can you please send me a copy of the book. Thanks
    Bruce Norris
    New Member
    New Member
    Posts:6

    --
    21 Jul 2015 08:29 PM
    I have been seeking information on this topic for the past few hours and found your post to be well written and has solid information.
    Dean Winchester Coat Amazon: http://www.amazon.com/Outfitter-Jac...B00YIUIKL4

    You are not authorized to post a reply.

    Forums > Engineering Questions and Answers > Student Questions