Dear Martin and Aaron,
I see two issues:
1 You need to be more specific if you use BTUs as these vary with
temperature.
2 Avoiding the use of the single coherent SI unit for energy, joule,
means that you have difficulty comparing the energy used in different
industries. See http://www.metricationmatters.com/docs/ObamaEnergyPower.pdf
Cheers,
Pat Naughtin
Geelong, Australia
On 2009/04/12, at 6:52 AM, Martin Vlietstra wrote:
Some twenty five years ago I worked on a project for the Indian
Power Generation Company to enable engineers to calculate the
efficiency of their power stations. All calculations were done in
metric units.
From: [email protected] [mailto:[email protected]] On
Behalf Of Aaron Harper
Sent: 11 April 2009 21:33
To: U.S. Metric Association
Cc: U.S. Metric Association
Subject: [USMA:44589] Re: Steam energy
Steam Enthalpy has been measured in BTUs for every power plant I
have ever worked on so far. The day that I have to develop a
control system using SI units, I will be in for some retraining.
After 25 years of old school, I am sure it will be a bit of an
effort, but at least I was taught SI, I've just never had a need to
use it in practice yet.
Aaron
On Sat, Apr 11, 2009 at 12:27 AM, Pat Naughtin <[email protected]
> wrote:
On 2009/04/11, at 3:54 PM, Aaron Harper wrote:
No matter what system of units are used, to speak of steam in terms
of any unit of volume is not very meaningful, unless you also
include the temperature and pressure of the steam. In power plants,
we talk of steam in terms of mass, or we simply state the
temperature and pressure of the steam which is directly related to
the energy contained within the steam and available to do work.
Aaron Harper
Dear Aaron,
What units do you use for the energy content of steam? Do you use
the sole SI unit for energy: joules, kilojoules, and megajoules, etc.?
Cheers,
Pat Naughtin
PO Box 305 Belmont 3216,
Geelong, Australia
Phone: 61 3 5241 2008
Metric system consultant, writer, and speaker, Pat Naughtin, has
helped thousands of people and hundreds of companies upgrade to the
modern metric system smoothly, quickly, and so economically that
they now save thousands each year when buying, processing, or
selling for their businesses. Pat provides services and resources
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industrial and government metrication leaders in Asia, Europe, and
in the USA. Pat's clients include the Australian Government, Google,
NASA, NIST, and the metric associations of Canada, the UK, and the
USA. See http://www.metricationmatters.com for more metrication
information, contact Pat at [email protected] or
to get the free 'Metrication matters' newsletter go to: http://www.metricationmatters.com/newsletter
to subscribe.
Pat Naughtin
PO Box 305 Belmont 3216,
Geelong, Australia
Phone: 61 3 5241 2008
Metric system consultant, writer, and speaker, Pat Naughtin, has
helped thousands of people and hundreds of companies upgrade to the
modern metric system smoothly, quickly, and so economically that they
now save thousands each year when buying, processing, or selling for
their businesses. Pat provides services and resources for many
different trades, crafts, and professions for commercial, industrial
and government metrication leaders in Asia, Europe, and in the USA.
Pat's clients include the Australian Government, Google, NASA, NIST,
and the metric associations of Canada, the UK, and the USA. See http://www.metricationmatters.com
for more metrication information, contact Pat at [email protected]
or to get the free 'Metrication matters' newsletter go to: http://www.metricationmatters.com/newsletter
to subscribe.
