That's only useful for the economic task (both financial and environmental) of determining which of several units of the same nominal cooling capacity to buy. In other words, it's a consideration only at the end of the decision making process.
It won't help a buyer determine how big a unit to get for a house or other building of a given size (in a given climate). Bill Potts, CMS Roseville, CA http://metric1.org [SI Navigator] >-----Original Message----- >From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] >Behalf Of Gene Mechtly >Sent: Saturday, September 27, 2003 09:23 >To: U.S. Metric Association >Cc: U.S. Metric Association >Subject: [USMA:27063] Re: Air conditioners > > >On Tue, 23 Sep 2003, john mercer wrote: > >> Could someone please tell me what the SI unit is for measureing >the output >> of airconditioners? > >The most revealing measurement is "Coefficient of Performance (COP)" which >is defined as the time rate of heat energy removed divided by the time rate >of electrical energy input to operate the compressor, blower, and controls. > >Since both time rates are power (watts (W) in SI), the COP ratio is in >units of W/W which makes COP a "unitless" number. > >Prof Eugene (Gene) Mechtly, College of Engineering >University of Illinois at Urbana-Champaign >
