Tons/hp

[Alwayslearningelec]

Isn't there a rought calculation that a 'x' number of tons equats to 'x' number of HP? Thanks.

 

[Dennis Alwon]

One ton (refrigeration) is equal to about 4.7 hp-- I think

 

[ed downey]

Litteraly Dennis is correct.

A ton of cooling is defined as 12,000 BTU/hr.
One HP is eqiuvalent to (746 Watts * 3.413 BTU/Watt) 2547 BTU/hr.
Hence 1 ton = 12,000/2547 = 4.711 HP.

But if you size electrical feeders from this you will be way oversized for the piece of equipment.

-Ed

 

[sgunsel]

How rough is good enough? AC unit efficiency varies over quite a wide range, at least 50%. "Rough" calculations will not be close enough to be of use. You need the specs from the manufacturer. You can download catlogs for various size AC units to see how much power they require, but the info is of little value except for those units from that manufacturer.

 

[G._S._Ohm]

It varies with the COP which varies with the temp.

 

[480sparky]

You've obviously asked an HVAC tech for the specs on an unit you need to wire up.

All they care about it output. They don't care what size wire, or conduit, or breaker it will need. What you need to ask for is the nameplate data.

Otherwise, all you will get is the tonnage of the unit. And that doesn't mean squat to an electrician.

 

[bob]

check this http://forums.mikeholt.com/showthread.php/122750-Hvac-electrical-load?highlight=convert+tons

 

[John120/240]

horse power

horse power

One horse power IIRC is the amount of energy that it takes a horse to raise

33,000 pounds one foot in one minute. Or 746 watts = 1 hp, but you knew that.