Aircon HP salesman is asking

[ClimateChange]

Hi,

Newbie here. I just want to ask something about Horsepower capacity of an Air-Conditioning unit the Salesman is offering in an AC store. Is it the Electrical Hp or Mechanical Hp?

I have here some conversions:
Mechanical: 1 TR = 3.5167 KW
Electrical: 1 Hp = 0.746 KW

I believe these conversions should never be used to convert Mechanical cooling capacity (TR or KW) to get the horsepower capacity of an AC unit.

Thanks in advance to those who will give some of their time to answer my question.

 

[LittleInch]

Probably the biggest number he or she can come up with to impress the potential buyer.

The word capacity indicates the cooling capacity but without seeing some figures is not easy to say which one is being quoted. Domestic systems would rarely be able to supply more than 3 to 4 hp from a standard electric socket.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[GT-EGR]

Horsepower as a unit / conversion value is minimally different whether you are calling it electrical or mechanical - but if you are talking about motor hp or brake hp or air/water hp that’s when you have to be careful.

That being said your conversion values are all there - 1 HP = 746 W x 746/3517 = 0.21 tons

Simplest way to be sure would be to ask that rep to use a more common unit.

 

[Emrelug84]

The cooling capacity of air conditioners is usually measured in tons. One ton equals 12,000 BTUs (British Thermal Units) per hour. The term one ton comes from the amount of heat required to melt a block of ice that weighs one ton. 1 TR = 3.5167kW Therefore, it had better to ask what ton of cooling capacity of it is.

 

[chicopee]

Actually the number(s)S that the salesperson should have given you is either or all the cooling capacity in BTU/HR, Tons, the coefficient of performance or EER. Anything else is garbage information except if you were the electrician or sheet metal guy.

 

[LittleInch]

Emrelg,

Interestingly the definition of ton of refrigeration seems to be either the energy need to melt a ton (2000lb) of ice OR the energy required to freeze a ton of ice depending on where you look. Either way it appears to be defined as 12,000 BTU/hr!

An interesting article below on refrigeration horsepower. Basically it's all rubbish as you can't really convert heat flow into mechanical power, which is what everyone associates hp with.

https://www.innovativethermal.com/Articles/Definition of Refrigeration Horsepower.PDF

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[Compositepro]

To clarify, that one ton is melted in 24 hours.

 

[IRstuff]

"either the energy need to melt a ton (2000lb) of ice OR the energy required to freeze a ton"

That's because it is the same energy, the latent heat of fusion:

TTFN (ta ta for now)
I can do absolutely anything. I'm an expert!

https://www.youtube.com/watch?v=BKorP55Aqvg

faq731-376 forum1529 Entire Forum list

http://www.eng-tips.com/forumlist.cfm

 

[ClimateChange]

Thank you so much for all of your responses. I am now convinced that HP unit being used as Cooling capacity is incorrect.

 

[Drazen]

Don't be convinced, check first! Japanese and Korean guys, for instance, sometimes have different habits compared to US/Europe as regard to units used.

 

[lilliput1]

Just don't get confused about cooling capacity vs power input to the AC unit.