The capacity of an AC is indicated in tons. What does it actually mean?
485483
I looked it up....it's the melting power of one short ton (2000) pounds of ice in 24 hours.
831873
Is it referring to the heat load calulation for air con
410537
The ampacity (current-carrying capacity) of any given cable is determined by the maximum heat that its insulation and jacket can withstand. The heat dissipating ability of the conductor is reduced by the electrical insulation around the conductor. If the current in the conductor is too high, the insulation would be damaged long before the conductor melts. Common standard ratings of cable insulation are 60, 90, or 105 degrees Celsius depending on the type of insulation.\n\nThe ampacity for a cable is based on current, ambient temperature, and environmental conditions adjacent to the cable. In a long run of cable different conditions govern, and installation regulations specify that the most severe condition along the run governs the cable's rating. Cables run in wet or oily locations may carry a lower temperature rating than in a dry installation. Special calculations are necessary for multiple circuits in proximity in adjacent raceways. When multiple cables are bundled together, each contributes heat to the bundle and diminishes the amount of cooling air that can flow past the individual cables. The overall ampacity of the insulated conductors in a bundle of more than 3 must be derated, whether in a raceway or cable. Usually the de-rating factor is tabulated in the wiring regulations.\n\nFor a table on AWG american wire gage and ampacity check out the following link:
926697
It's actually a metric tonne. Ton is the imperial measure. \nA metric tonne is 1,000 kg. or about 90% of a regular ton.\nA metric tonne is slightly larger than a short ton, which weighs only 2,000 pounds against the 2,240 lbs in a regular ton.
757708
It's hard to say, exactly, as the term is used in a number of different ways.  Most likely the meaning you have in mind is that of a central air compressor that provides compressed air to an entire "plant."  (Factory, maintenance shop, bulk materials depot, medical gasses plant, or other type of "plant.")\n\nIf a central compressor provides compressed air for a variety of devices spread throughout the installation, then all devices that depend on compressed air will stop if the central compressor stops.\n\nTo be sure, you need to read engineering textbooks and the industry press, and get out there and get some hands on experience.  Good luck.
58370
"Gb's" would refer to the size of the hard drive, generally. Most laptops tend to have a 40 or 60 GB hard drive. It's more than likely that you'll never fill a hard drive that big, so if it has 40, don't worry too much. \n\nThe previous commenter was referring to RAM. Most laptops will run perfectly fine with 512MB of RAM, which is less than 1 GB. You'd only need that much if you were doing high-end gaming.
960599
If it is a residential application:  850 sqft/ton\nIf it is a commercial application:  350sqft/ton\n\nEx.  1700 sqft / 850 sqft/ton = 2 tons of air conditioning
537961
100%\n\nit means it is broken and only working at 35% of expected capacity.
191233
81 billion tons \nhere is a site that explains how this number comes about\nhttp://www.newton.dep.anl.gov/askasci/ast99/ast99487.htm
1138430
Not a good question. Power is related to the volume of fuel/air mixture.
268720
1. Ton.\n2. Silence.\n3. They were invented by women.
412984
Always figure you get roughly 7% less than the rated storage amount. \n\nManufacturers decided to rate most drive capacities based on the standard base 10 numbers we are all familiar with, but the actual measurments are in base 2.\n\nTherefore, one Megabyte equals one million bytes while one Gigabyte equals one billion bytes. This isn't too much of a problem with fairly small numbers such as a Kilobyte, but each level of increase in the prefix also increased the total discrepancy of the actual space compared to the advertised space.\n\nHere is a quick reference to show the amount that the actual values differ compared to the advertised for each common referenced value:\n\n    * Megabyte Difference = 48,576 Bytes\n    * Gigabyte Difference = 73,741,824 Bytes\n    * Terabyte Difference = 99,511,627,776 Bytes \n\nBased on this, for each Gigabyte that a drive manufacturer claims, they are over reporting the amount of disk space by 73,741,824 Bytes or roughly 70.3 MB of disk space. So, if a manufacturer advertises an 80 GB (80 billion bytes) hard drive, the actual disk space is around 74.5 GB of space, roughly 7% less than what they advertise.
160298
Flux capacity...hmmm now that's a good one.\n\nI agree, I think someone is pulling your leg.\n\nThe only flux terminolgy I'm aware of is soldering flux, but it's not even measured, much less as a capacity measurement.
267096
A "short ton" which is what we usually use in the US is 2000 pounds. A "long ton" is 2240 pounds (used in the UK).\nIn addition, there is a "metric ton" which is 1000kg or 2204 pounds (about). In much of the world this is called a tonne, but in the US, it is usually called a "metric ton."\n\nThe short/long is because of the different definitions in the US and UK for "hundredweight". In the US a hundredweight is 100 pounds, but in the UK it is 112. Either way, 20 hundredweight makes a ton.
727450
i think efficiency is expressed as ratio of power inputed/power outputed\n\nie if the compressor was rated at 800w( uses 800w) and gave out 800w in useable power then its efficiency is said to be 1/1 or 1, but no machine is that efficient, due to heat , vibration and friction etc.\n\nif the compressor was rated at 800w and gave out 200w of usable energy it would be an efficiency of 1/4 or 0.5
109470
This ain't my forte, but here goes.\n\nAdiabatic expansion is like what my freezer and air conditioner use to cool things off.  They take a pressurized gas and let it expand, which drops its temperature.  Then they let this low-temperature stuff suck up the heat in my Ben & Jerry's or in my house.  If you've ever discharged a CO2 fire extinguisher or used a can of compressed air to clean your computer, the CO2 is so cold it condenses the water in the atmosphere or the air on your computer is very cold.\n\nIsothermal means the temperature stays the same.  So if your gas expanded and it didn't get colder, something else went on to provide the heat to keep the temperature the same.  \n\nMaking heat is work, in physics terminology, so the isothermal expansion required more work than the adiabatic expansion.
236050
When I was at school a ton was 2240 lbs. Using this, 20 tons = 20 x 2240 = 44800lbs.\n\nNow we have a metric system here in Oz. One ton is 1000 kg. As a kg = 2.2lbs, 20 ton would be 44000lbs.\n\nOften a measure called a "short ton" is used. This is equal to 2000lbs.