A/C

what do tones have to do with air conditioners? or did you mean something else by A/C

Do you mean 3 phases alternating current? Relationship between kW and 3-ph is in any electrical handbook. Frequency has little to do with power, although inductive or capacitive loads designed for one frequency will consume more or less power at different frequencies.

i think this is best answer thanks

as from your calculation

1 tone =3.5 kw

am i right so if we use a 3 tones A/c it will take 9.5 kw

dineshpandit80

You need to get on the Internet and do some of this research yourself.

After some more digging, 3.5 kw is way too high. I usually use 1.5 kw per ton. The problem is the efficiency of the modern compressor.

A electric nickel chrome heater element produces 3.4 BTU/Hour
The very efficient mechanical refrigeration compressor produces 8.533 BTU/Hour+/-
I had a 4 ton unit 10 SEER that pulled 28 amps. That's 28x240 = 6720 kva /4ton = 1.7 kva per ton
One ton of frig.=12000 BTU/hour
1 watt=8.533 BTU/hour compressor

4 tons x 12,000=48,000 BTU/hour

48,000/8.533=5,625 watts 1.4 kw per ton 1.75 kva per ton

5,625/240 volts=23 amps more efficient machine

If you include the SEER, then you can do it another way. SEER is defined as the heat transferred per unit of energy, that is in BTU/watthour.

P = AC load/SEER

For your 4 ton unit and SEER = 10,

P = (48,000 BTU/hour)/(10 BTU/watthour) = 4,800 watts,

then throwing in PF,

I = P/(VxPF) = 4800W/(240V x 0.8) = 25A 1.2 kw per ton or 1.5 kva per ton

This is comparable to the other result.

Dear Sir

in your first answer you told me that

1W=3.41 BTU/H

But in second Answer you are saying that

1W=8.533 BTU/H

Plz tell me which one is right

OK...This looks like an Efficiency question to me. If I'm off the mark, that cool you will have many others to look at.

The way I read the questions is: -

"How much Power (kW) do I need to generate 3 tonnes of cooling Capacity?"

The answer to which is too complex to answer in a short lunchtime post.

The are are many variables such as: - Is it an Air cooled system, Water cooled, Chillers, condenser system or geothermal.

Without the details for your system, we can't work it out with you.

If this is theoretical system, you will need to understand the design parameters and location of your system to start working it out.

Regards,
Sapper

Read the new post again.

"A electric nickel chrome heater element produces 3.4 BTU/Hour
The very efficient mechanical refrigeration compressor produces 8.533 BTU/Hour+/- "