260 volt AC window unit ?

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Sahib said:
The Korean manufacturer Samsung Air conditioners has put up a stall in LasVegas trade exhibition for selling their airrcons in US. They should have got certification from UL for that purpose...........
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Mgraw said:
This technology is available in residential and commercial AC systems. The largest I have done so far is 25 ton.
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I wired up a system a couple years ago in a school. Don't recall how many ton the units were, but each unit had two compressors, was interconnected with two other units (three compressor units to one individual system), refrigerant piping run to "mode changing units" and then to air handlers in each individual room. This system was pretty much Korean made, sold by Ingersoll-Rand, also had American Standard and Trane, names associated with it. (which those names are all now under I-R). From what I recall each unit had a MCA of around 50-65 amps (there were some variances in capacity) We had a 208 volt three phase supply - I can't recall what nameplate voltage was, but if 260 volts were in the range of what is possible it wouldn't surprise me. These were VFD driven units.

There was some listing issues with certain components of this system - they had a control box that was a conversion box for standard North American design air handlers (which a few were used in this installation) to interface with the controls of the master system - it had no listing marked on it. Otherwise the international design air handlers and the compressor units and mode changing units all did have Intertek listing.
 
Sahib said:
That depends on how efficient the aircon is. For rough estimate, 1.6kW=1ton.
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Um, no. A ton of refrigeration is, by definition, 3.517 kW. No more, no less, and not affected by the machine's efficiency.
"The ton of refrigeration is equivalent to the consumption of one ton of ice per day and originated during the transition from stored natural ice to mechanical refrigeration. ... "
https://en.wikipedia.org/wiki/Ton_of_refrigeration

You seem to be answering an altogether different question, something like "How many kW of electricity are required to achieve 3.5 kW of refrigeration?".
(and if the machine in your example actually has an efficiency of only 2.2, you probably shouldn't install it!)
 
drcampbell said:
Um, no. A ton of refrigeration is, by definition, 3.517 kW. No more, no less, and not affected by the machine's efficiency.
"The ton of refrigeration is equivalent to the consumption of one ton of ice per day and originated during the transition from stored natural ice to mechanical refrigeration. ... "
https://en.wikipedia.org/wiki/Ton_of_refrigeration

You seem to be answering an altogether different question, something like "How many kW of electricity are required to achieve 3.5 kW of refrigeration?".
(and if the machine in your example actually has an efficiency of only 2.2, you probably shouldn't install it!)
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Obviously B was asking about power or energy consumption of an aircon for a given tonnage and not about unit conversion from ton to kW. Also efficiency can not be 2.2; it is less than 1.
 
drcampbell said:
Um, no. A ton of refrigeration is, by definition, 3.517 kW. No more, no less, and not affected by the machine's efficiency.
"The ton of refrigeration is equivalent to the consumption of one ton of ice per day and originated during the transition from stored natural ice to mechanical refrigeration. ... "
https://en.wikipedia.org/wiki/Ton_of_refrigeration

You seem to be answering an altogether different question, something like "How many kW of electricity are required to achieve 3.5 kW of refrigeration?".
(and if the machine in your example actually has an efficiency of only 2.2, you probably shouldn't install it!)
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I agree, output is what a unit is rated for, input will be higher - how much depends on efficiency.
 
Sahib said:
Efficiency and coefficient of performance are not same.
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In the context of heat pumps and air conditioning, the word efficiency is typically used to mean coefficient of performance, rather than some other thermodynamic efficiency.

Cheers, Wayne
 
wwhitney said:
In the context of heat pumps and air conditioning, the word efficiency is typically used to mean coefficient of performance, rather than some other thermodynamic efficiency.

Cheers, Wayne
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You may well then also show energy conservation law is not violated.:thumbsup:
 
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