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Guest	Refrigeration and Liters and AC in Tons 06/23/2009 8:17 AM
	Why refrigeration comes in Liters and AC in tons
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TVP45 Guru Join Date: Jul 2007 Posts: 3354 Good Answers: 81	#1 Re: Why refrigeration comes in Liters and AC in tons 06/23/2009 9:23 AM
	Well, the ton unit goes back to the start of refrigeration - ice plants. A ton is more correctly the capacity to turn a ton of 32°F water into a ton of 32°F ice. The latent heat is 144 BTU/lb. So multiply that by 2000 lb/ton and you get 288000 BTU. Divide by 24 hr/day and you get 12000 BTU/hr to make a ton of ice in 1 day. Everybody drops the "in one day" part, but that's what it means. I'm puzzled about the "liter" unit. Refrigerators are sized by volume (cubic feet in the US and liters in Europe). Is that what you mean? That relates to the amount of product they hold and is only approximately related to power. __________________ "If you aren't gonna shovel coal, keep your hands off the train whistle!" - Jr. Zirk

PWSlack Guru Join Date: Jan 2007 Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing. Kettle's on. Posts: 8642 Good Answers: 163	#2 Re: Refrigeration and Liters and AC in Tons 06/24/2009 3:28 AM
	Furlongs per square fortnight is a valid unit of acceleration. __________________ The elephant is a funny bird. It flits from bough to bough. It lays its eggs in a rhubarb tree and whistles, like a cow - Spike Milligan.

Turbotroll3 Power-User Join Date: Oct 2008 Location: Houston, Texas Posts: 169 Good Answers: 2	#3 Re: Refrigeration and Liters and AC in Tons 06/24/2009 4:48 PM
	I prefer elephants per astronaut as my favorite nonsense measurement. __________________ If the software can detect, compensate, avoid, or correct an anomalous condition in the system, it is, by definition, a software problem-regardless of the root cause. In the long run, for most classes of problems, it is cheaper to fix it in the SW

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