Re: energy requirement

From: <segun>
Date: Mon Feb 26 2007 - 13:54:00 EST

Rao,
since the question says they want the water heated to the desired temperature (80 degree) within one hour, the appropriate solution I think is to divide 95550 by 3600 and arrive at an answer (26.54 KW)

You can now advise the the company accordingly.

Thanks
Segun O
--- praveen purohit <prvapubo@yahoo.co.in> wrote:

> 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=4ACzavCwNRg_UV4D_GXOBW2IlPr3mNhpYBDV-d0qhJew4Hbr4noirGl6tpuIXyveR8C7DtWo581vGaNS6TdjlhVwzQ">PipingDesign@yahoogroups.com</a>
> 02/12/2007 03:15 PM
> Please respond to
> <a href="/group/PipingDesign/post?postID=4ACzavCwNRg_UV4D_GXOBW2IlPr3mNhpYBDV-d0qhJew4Hbr4noirGl6tpuIXyveR8C7DtWo581vGaNS6TdjlhVwzQ">PipingDesign@yahoogroups.com</a>
>
> To
> <a href="/group/PipingDesign/post?postID=4ACzavCwNRg_UV4D_GXOBW2IlPr3mNhpYBDV-d0qhJew4Hbr4noirGl6tpuIXyveR8C7DtWo581vGaNS6TdjlhVwzQ">PipingDesign@yahoogroups.com</a>
> cc
>
> 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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