<HTML>
<HEAD>
<TITLE>Re: [Greenbuilding] energy and power terms</TITLE>
</HEAD>
<BODY>
<FONT FACE="Calibri, Verdana, Helvetica, Arial"><SPAN STYLE='font-size:11pt'>I second and resemble the remark.<BR>
<BR>
It’s analogous and confounded by the confusion over BRIGHTNESS — everyone wants to compare lightbulbs by the watt and nobody knows what a lumen is. Now there you have nasty apples and oranges.<BR>
<BR>
<BR>
On 11/21/11 11:44 AM, "David Bergman" <<a href="bergman@cyberg.com">bergman@cyberg.com</a>> wrote:<BR>
<BR>
</SPAN></FONT><BLOCKQUOTE><FONT FACE="Calibri, Verdana, Helvetica, Arial"><SPAN STYLE='font-size:11pt'>Completely agree. It's also why the term kilowatt-hours is so confusing to most folks (many of who think it is kilowatt per hour).<BR>
<BR>
David<BR>
<BR>
At 10:04 AM 11/21/2011, Alan Abrams wrote:<BR>
</SPAN></FONT><BLOCKQUOTE><FONT FACE="Calibri, Verdana, Helvetica, Arial"><SPAN STYLE='font-size:11pt'>methinks that what is problematical is semantical. if it is gallons of milk that are important to a mother, and gallons of milk per hour that are important to a milkmaid, and if these terms are logical and intuitive--then watts should logically be the term for the volume of electricity consumed, and watts per hours should be the term for the rate. <BR>
<BR>
but it's not. hence the confusion.<BR>
<BR>
On Mon, Nov 21, 2011 at 7:06 AM, nick pine <<a href="nick@early.com">nick@early.com</a>> wrote:<BR>
David Bergman writes:<BR>
<BR>
The article also says, btw, that watts are comparable to horsepower. But I do find their explanation before that rather confusing: "A laborer working through the day will put out 75 watts of power. A medium-sized car might consume 100,000 watts." Those sound like energy totals, not flows.,<BR>
<BR>
<BR>
Perhaps the intent was to say that the laborer can generate 75 watts for a long time, vs 300 watts for a shorter time. And accelerating a 4000 pound car from 0 to 60 mph takes about 1/2mV^2 = 1/2x4000x0.454lb/kg(60x0.447)^2 = 653K joules. If that happens in 6 seconds, it might require a constant 653K/6 = 109K joules per second, ie 109 kW for 6 seconds, or perhaps more power and smoke at the beginning and less at the end, at a non-constant rate.<BR>
<BR>
Nick Pyner wrote:<BR>
<BR>
... If you must use automotive terms, I submit it might be better to use the fuel gauge than the speedo.<BR>
<BR>
<BR>
The rate of change of the fuel gauge is closer to power than the speedo.<BR>
<BR>
<BR>
Or how about the engine? A watt is exactly like a horsepower, just 3/4 the size, and most of the world uses just that.<BR>
<BR>
<BR>
One horsepower is about 3/4 of a kilowatt, like 10 75-watt people.<BR>
<FONT COLOR="#888888"><BR>
Nick <BR>
</FONT><BR>
_______________________________________________<BR>
Greenbuilding mailing list<BR>
to Send a Message to the list, use the email address<BR>
<a href="Greenbuilding@bioenergylists.org">Greenbuilding@bioenergylists.org</a><BR>
<BR>
to UNSUBSCRIBE or Change your List Settings use the web page<BR>
<a href="http://lists.bioenergylists.org/mailman/listinfo/greenbuilding_lists.bioenergylists.org">http://lists.bioenergylists.org/mailman/listinfo/greenbuilding_lists.bioenergylists.org</a> <BR>
<BR>
<BR>
_______________________________________________<BR>
Greenbuilding mailing list<BR>
to Send a Message to the list, use the email address<BR>
<a href="Greenbuilding@bioenergylists.org">Greenbuilding@bioenergylists.org</a><BR>
<BR>
to UNSUBSCRIBE or Change your List Settings use the web page<BR>
<a href="http://lists.bioenergylists.org/mailman/listinfo/greenbuilding_lists.bioenergylists.org">http://lists.bioenergylists.org/mailman/listinfo/greenbuilding_lists.bioenergylists.org</a> <BR>
</SPAN></FONT></BLOCKQUOTE><FONT FACE="Calibri, Verdana, Helvetica, Arial"><SPAN STYLE='font-size:11pt'><BR>
David Bergman RA LEED AP<BR>
<FONT COLOR="#808080"><B>DAVID BERGMAN</B> ARCHITECT / <B>FIRE & WATER</B> LIGHTING + FURNITURE<BR>
architecture . interiors . </FONT><FONT COLOR="#008080">ecodesign</FONT><FONT COLOR="#808080"> . lighting . furniture<BR>
<a href="bergman@cyberg.com">bergman@cyberg.com</a> <U>www.cyberg.com <<a href="http://www.cyberg.com/">http://www.cyberg.com/</a>> </U> <BR>
241 Eldridge Street #3R, New York, NY 10002<BR>
t 212 475 3106 f 212 677 7291<BR>
<HR ALIGN=CENTER SIZE="3" WIDTH="95%"></FONT></SPAN></FONT><FONT SIZE="2"><FONT FACE="Consolas, Courier New, Courier"><SPAN STYLE='font-size:10pt'>_______________________________________________<BR>
Greenbuilding mailing list<BR>
to Send a Message to the list, use the email address<BR>
<a href="Greenbuilding@bioenergylists.org">Greenbuilding@bioenergylists.org</a><BR>
<BR>
to UNSUBSCRIBE or Change your List Settings use the web page<BR>
<a href="http://lists.bioenergylists.org/mailman/listinfo/greenbuilding_lists.bioenergylists.org">http://lists.bioenergylists.org/mailman/listinfo/greenbuilding_lists.bioenergylists.org</a><BR>
</SPAN></FONT></FONT></BLOCKQUOTE>
</BODY>
</HTML>