Chris Lewis wrote:

According to Richard J Kinch :

http://www.apcmedia.com/salestools/T...XPED_R1_EN.pdf writes:


A ton is equal to 12,000 BTUs and is the amount of heat
energy required to melt
2000 pounds (907kg) of ice in one hour.

Amazing that APC is publishing such stupidity as this. This would flunk
high school physics. Even a public school.


Indeed. For those who didn't catch it, a ton of ice takes the
same amount of energy to melt, regardless of how long it takes.

[Especially when you notice the other posting that says "of ice
in 24 hours..."]

Careful! You might miss a high school physics question too.
Unfortunately, a Refrigeration ton is is sometime a unit of power,
and sometimes a unit of energy.
As a unit of power, (in the US) it is 12000 BTU per HOUR, which is
also approximately the amount of power required to melt one ton
(2000 pounds) of ice per DAY.
That is also called a "commercial ton of refrigeration".

As a unit of energy ("standard ton of refrigeration"), it is 288,000 BTUs,
which is approximately the energy required to melt 2000 pounds of
ice. (not a rate, so no time units here).

See:


http://en.wikipedia.org/wiki/Ton#Uni...ergy_and_power
http://www.sizes.com/units/ton.htm#ton_of_refrigeration
http://home.att.net/~numericana/answ....htm#othertons