RE: energy requirement

From: <Steve>
Date: Thu Feb 22 2007 - 17:42:00 EST

The specific heat of water (4.2 approx) has been overlooked. I assume you are heating from 15 deg C.
Ignoring losses:

350 (kg)/3600 sec/hr) X 4.2 (kJ/kg-C) X (80-15)(deg C) = 26.5 kW

Cheers

Steve

>From: praveen purohit <prvapubo@yahoo.co.in>
>Reply-To: <a href="/group/PipingDesign/post?postID=aWKCmgsTJWeGXX6T-ruxVAZF9KHjnnBBVHabTc0ocK1pVJSiWKZwVARHcyY9OIIq4tuzPKmJTjOHm8OrbX1CWZmPt1Ceqg">PipingDesign@yahoogroups.com</a>
>To: <a href="/group/PipingDesign/post?postID=aWKCmgsTJWeGXX6T-ruxVAZF9KHjnnBBVHabTc0ocK1pVJSiWKZwVARHcyY9OIIq4tuzPKmJTjOHm8OrbX1CWZmPt1Ceqg">PipingDesign@yahoogroups.com</a>
>Subject: [PipingDesign] energy requirement
>Date: Thu, 22 Feb 2007 08:49:46 +0000 (GMT)
>
>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=aWKCmgsTJWeGXX6T-ruxVAZF9KHjnnBBVHabTc0ocK1pVJSiWKZwVARHcyY9OIIq4tuzPKmJTjOHm8OrbX1CWZmPt1Ceqg">PipingDesign@yahoogroups.com</a>
>02/12/2007 03:15 PM
>Please respond to
><a href="/group/PipingDesign/post?postID=aWKCmgsTJWeGXX6T-ruxVAZF9KHjnnBBVHabTc0ocK1pVJSiWKZwVARHcyY9OIIq4tuzPKmJTjOHm8OrbX1CWZmPt1Ceqg">PipingDesign@yahoogroups.com</a>
>
>To
><a href="/group/PipingDesign/post?postID=aWKCmgsTJWeGXX6T-ruxVAZF9KHjnnBBVHabTc0ocK1pVJSiWKZwVARHcyY9OIIq4tuzPKmJTjOHm8OrbX1CWZmPt1Ceqg">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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