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**To**:**Aquatic-Plants at actwin_com****Subject**:**Re: The chilling truth about cold horsepower - Or fun with numbers****From**:**"S. Hieber" <shieber at yahoo_com>**- Date: Sun, 8 Jun 2003 06:07:43 -0700 (PDT)
- In-reply-to: <200306081123.h58BND3F014368@otter.actwin.com>

Jerry Smith tracked down a reference source with e 12,000 BTU/hr= 1 hp = 1 ton Refrigeration. And he found out a curious thing. > I checked my 1965 World Book Encyclopedia and found the > following > information in the article on Air Conditioning. Air > conditioners are rated > in three ways, by B.T.U.'s, Tons of Refrigeration, or by > Horsepower. One Ton > of Refrigeration removes the amount of heat needed to > melt one ton of ice in > 24 hours. One Ton of Refrigeration can remove 12,000 > B.T.U.'s of heat in one > hour. The B.T.U. is the amount of heat needed to raise 1 > lb. of pure water 1 > degree F. Ah yes, Tons Refrigeration is a standardised unit of power, as are BTU/hr and HP. So mathematics *ought* to be applicable: If 1 hp = 2450 btu. hr and = 1 ton Refrigeration, which in trun = 12,000 btu/hr, then 2450 btu/hr =2450 btu/hr ! I reviewed the axioms and theorems in the methods of mathematics I'm using and, although not a mathematician by any stretch of the wildest imagine, feel reasonbably certain that something is wrong with the above. > An air conditioner rated at 12,000 B.T.U./hr. > can remove the heat > needed to raise 12,000 lbs. of water 1 degree F. > Horsepower is the amount of > power needed to run the refrigeration equipment that > cools the air. So 1 hp of input (745.7 watts or 2450 BTU/hr) can cause a chiller to have 12,000 BTU/hr of output (to absorb and disperse 12,000 BTU/hr)? Or to put it anothger way, 2450 BTU/hr can provide enough kinetic energy to water molecules to move them from solid to liquid temperature and do so 12,000 btu/hr worth. Does it not take at least 1 BTU/hr (probably more) to absorb and disperse 1 BTU/hr? I new these dangnab electronic calculators would prove unreliable someday! Where's my old slide rule? Here are some measuremetns for an actual refrig unit, the units in "*" marks are measurements and the others are conversions: Input minimum=*5,820 watts* = 7.8 Tons Ref. = 93.7 BTU/hr Output avg.=2983 watts = *4 Tons Ref.* = *48,000 BTU/hr./ That makes sense, it takes more to make less (entropy prevails, whether I like it or not). But the aquatic chillers seem to be about 600% energy efficient. > > I am not an expert at all on refrigeration, but answering > this question has > helped me with understanding what Tons of Refrigeration > means as I couldn't > understand why such a term was used. Thanks Scott for the > question and > provoking me to search it out. > > Jerry You're satisfied? You're certainly welcome. But now I just wish *I* knew what the heck what going on. This still seems to me to be as whacky as Eheim's pump ratings. Scott H. __________________________________ Do you Yahoo!? Yahoo! Calendar - Free online calendar with sync to Outlook(TM). http://calendar.yahoo.com

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