2002-07-02 Last week in a local K-Mart I walked past some air conditioners which had a new rating on them. The rating was called EER. This was a measurement of efficiency in kW/BTUH or some garble like that.
It almost seems like the industry goes out f their way to come up with meaningless units. Instead of using clearly understandable percent (W/W x 100), they come up with these numbers that no one understands and thus ignores. Oh, how sweet it would be if the people who come up with this crap would get charged with fraud and spend some time in jail, where they can their BTU reamed out a few times a day. John ----- Original Message ----- From: "Gene Mechtly" <[EMAIL PROTECTED]> To: "U.S. Metric Association" <[EMAIL PROTECTED]> Cc: "U.S. Metric Association" <[EMAIL PROTECTED]> Sent: Tuesday, 2002-07-02 17:06 Subject: [USMA:20779] COP > Coefficient of Performance (COP) is defined for many processes as > output divided by input. If the quantities (and units) are the same > for both output and input, COP is sometimes called Efficiency (unitless). > > A typical COP is 4 (unitless) and *greater than 1* in the case of good > quality heat pumps. e.g. Rate of heat delivered = 12 kW by 3 kW of > electrical input to drive the compressor, fluid pumps, and air blower. > > Application of this concept to automobiles (or aircraft), gives "fuel > efficiency" as distance divided by volume (or mass) of fuel burned which > could be in the form km/L or km/kg respectively. > > There is nothing unique in US technology which defines output/input as a > measure of performance or efficiency. > > Gene. > ...................................... > On Mon, 1 Jul 2002, Markus Kuhn wrote: > > > Brian J White <[EMAIL PROTECTED]> writes: > > > I think km per liter would > > > have been a much better choice than liters per 100km. > > > > There seems to be a tradition in the US marketing world, to use > > reciprocal units in order to ensure that a higher number means better. I > > would be curious if you have any reference for where/when this practice > > originated historically. ... >
