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| Re: R-30 (1320618) | |||
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Re: R-30 |
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Posted by SelkirkTMO on Sat Oct 25 01:54:04 2014, in response to Re: R-30, posted by heypaul on Fri Oct 24 21:44:42 2014. As one who had to specify HVAC for television studios (them lights are pretty damned hot, not to mention all the equipment) the REAL answer here is that "air conditioning tons" and their modern BTU equivalent is based on the weight of the amount of ICE, and the amount of extraction that would have occurred in cooling from X number of tons of ice. Tons is the amount of heat energy that would be extracted from one ton of ice in a 24 hour period.Rail related: Tons told refrigerated freight operators how many tons of ice they had to load in a car each 24 hours to maintain temperature for that amount of time. That was the earliest use of cooling for things that needed to be refrigerated, such as meat, dairy, etc. The British came up with the BTU conversions when mechanical means of refrigeration were possible. That's why it's called a British Thermal Unit. Same stuff though. BTU's is an hourly conversion from the prior. |
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