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Power-User

Join Date: Aug 2007
Location: Lahore
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# Conversion of Cooling Capacity From Watts to Tons

03/30/2010 6:28 AM

Dear Friends,

We have been working for installation of Air Conditioners with the panels of our Corrugator machine. A vender calculated the AC with following info;

Useful cooling output 1000watts

Rated current 2.5Amp

If I calculate the power input by using 2.5Amp, this is 412Watts (220V, Cos p 0.75) then what is 1000watts?

We know the capacity of AC only in ton. How to convert the watts into ton?

A little bit confusion need to be cleared.

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### Comments rated to be Good Answers:

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Anonymous Poster
#1

### Re: Conversion of Cooling Capacity From Watts to Tons

03/30/2010 9:36 AM

Hello:

To convert these units of power, use:

1 ton = 3516.8528 watt

Plain and simple!

2
Power-User

Join Date: Jun 2009
Location: California
Posts: 106
#2

### Re: Conversion of Cooling Capacity From Watts to Tons

03/30/2010 11:37 AM

1 ton = 12000 BTUH = 3516 W

It seems to me you already have the AC capacity in watts (1000W) so I suspect you probably have a 1/2 ton unit. The actual sensible capacity of the unit will vary depending on ambient conditions, so the vendor may have run a selection based on your specific conditions. It is not unusual for the sensible capacity to be only 2/3 of the total capacity, especially in humid areas.

The ratio of cooling power to energy consumed is the coefficient of performance (COP), so if the cooling output is 1000W and the input is 412W then the COP is 2.4 (if it actually draws its rated current). COP by itself is not very useful, but it does give an idea of the efficiency of the unit.

Good Answer (Score 2)
Power-User

Join Date: Mar 2010
Posts: 132
#3
In reply to #2

### Re: Conversion of Cooling Capacity From Watts to Tons

03/30/2010 9:25 PM

Very good answer dac1267. jhunter1972

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