Re: energy requirement

From: <praveen>
Date: Mon Feb 26 2007 - 04:56:00 EST

i found my self solution of my questio energy requirement is as under:

   350 x 65 x1 = 22750 Kcal=22750 x 4.2 = 95550 kjoule    we are giving 6 kj energy per second thus time taken    95550/6=15924hr=4.42Hr,heater will be choose accordingly.this is general approximation and donot include heat and mass transfer cumborsome calculation. i wonder no body reply me?

   n purohit <prvapubo@yahoo.co.in> wrote:

           Mr. Rao,
please check my calculation and correct me if you find any scope:

Question: to raise the temperature of 350 liters water from 15 degree centigrate to 80degrere at atmospheric pressure my compney used two electric immersion water heater of 3 kw and claiming that it will heat the water to desire temperature with in one hour, i think they are wrong. my calculation is as under:

350 liters = .350 meter cube

weight of water = .350 x 1000 = 350kg

heat require = mst= 350x1x65=22750 jule

heaters are giving 6000 jule per second

heaters are of less capacity. kindly suggest the correct specification. because I am thinking that at least two number of heater of 11Kw should be used.

Dacharaju Krishnamohan Rao <dk_rao@qp.com.qa> wrote: Mr Imran,

visit "http://www.engdyn.com/pulsation/pipingfld.htm" which provides some published papers on the subject.

regards,
D.K.M.Rao.

"Farhad" <farhad_ss@yahoo.com> Sent by: <a href="/group/PipingDesign/post?postID=slnpwzPzcGy9Cb4kPVTnLS1iKxAr2wr4RQqP8ME33QuzHN_xISBeOHxXVFLQDpycnsuHD4mIzXD_qHlICuaRhPYex1k">PipingDesign@yahoogroups.com</a> 02/12/2007 03:15 PM
Please respond to
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Subject
[PipingDesign] Vibration

Dear Imran,

Definitely, you should use CAESAR II software to solve this problem. There are a few steps as follows:

1- Collect field data (displacements, RPM of pumps, pipe support configuration, etc.)

2- Model piping system in CAESAR II.
3- Run static analysis.
4- perform Harmonic analysis and enter harmonic displacement at pump-

pipe node.
5- Tweak some dynamic parameters to model exact problem. 6- Add some stiffness (pipe support) to your piping system, wherever possible.
7- Run static then dynamic analysis to see changes.

I hope it helps you.

Regards,
Farhad

• In PipingDesign@yahoogroups.com, "Imran M Ahmed" <imahmed@...> wrote:
  >
  > Hello Guys!
  >
  >
  >
  > We are facing vibration problem in the piping system of our plant.
  The
  > scenario is that the lean Amine pumps operate with a vibration of
  approx
  > 6 mm/sec pk on DE and 3.8 mm/sec pk on NDE. The vibration gets
  > transmitted through the piping into the standby pump which is not
  in
  > operation. The vibration recorded on the standby pump is
  approximately
  > 3.0 mm/sec pk. Do you have suggestion how to control this
  vibration?
  >
  >
  >
  > Regards,
  >
  >
  >
  > Imran Ahmed
  >
  >
  >
  >
  >
  > [Non-text portions of this message have been removed]
  >
  

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[Non-text portions of this message have been removed] Received on Mon Feb 26 04:56:00 2007