HP to Tons

[dongbadz]

Hi Good day!
Im just hoping someone who can teach me to convert HP of ACU to TR

Someone told me that 2.5HP of ACU is also a 3TR ?

Any formula for this?
thank you
Dongbadz

[yoelyeve]

(1) is compressors today are rated by BTUS not by HP.
Lets say ZR36K means 36900 BTUS @ 45F over 105F liquid.you have to look on the envelop of the compressor. That compressor is 2 3/4 HP.
HP is for the past

[nike123]

Hi Good day!
Im just hoping someone who can teach me to convert HP of ACU to TR

Someone told me that 2.5HP of ACU is also a 3TR ?

Any formula for this?
thank you
Dongbadz

When you converting HP to TR as power units than 1HP is 0.212 TR.
But if you trying to convert absorbed power of compressor to refrigeration capacity, than you must consider COP (http://en.wikipedia.org/wiki/Thermal_efficiency#Heat_pumps_and_refrigerators) of refrigeration system. If we presume usual COP of AC system of ~3 (although some modern small split-systems have COP of 4,5 or more) than your formula is like this:
TR= HP compressor*0,212*COP
1HP=1*0,212*~3=~0,64TR

[nike123]

(1) is compressors today are rated by BTUS not by HP.
Lets say ZR36K means 36900 BTUS @ 45F over 105F liquid.you have to look on the envelop of the compressor. That compressor is 2 3/4 HP.
HP is for the past

BTU is also past!
SI units (http://physics.nist.gov/cuu/Units/) are future.
Watt is SI unit for power.

[dongbadz]

Dear All, Thanks for the prompt response....

Dongbadz

[chemi-cool]

I disagree with all of you,

There is no way to convert HP > TR and COP will not add much,

Its all in the evaporating temperature, head pressure and ambient temp. { and that is if, lets say, the system has been designed perfect}

A 10 HP compressor [maneurop 124] will give output of 7.74 KW at -30° evaporation temp and 42.135 KW at 10°C evaporation. Now, thats only at 27°C ambient...... It will be a different story altogether when the ambient will rise to 45°C.

So?????????? How do you convert now?

[nike123]

I disagree with all of you,

There is no way to convert HP > TR and COP will not add much,

Its all in the evaporating temperature, head pressure and ambient temp. { and that is if, lets say, the system has been designed perfect}

A 10 HP compressor [maneurop 124] will give output of 7.74 KW at -30° evaporation temp and 42.135 KW at 10°C evaporation. Now, thats only at 27°C ambient...... It will be a different story altogether when the ambient will rise to 45°C.

So?????????? How do you convert now?

You are right my friend!
There is no right way to convert universally HP of compressor to refrigeration capacity.
Still, in our trade, there is constant practice of such conversions!
I am against:eek:, but who care?:mad:

[US Iceman]

Still, in our trade, there is constant practice of such conversions!


Yes, and it is a practice that should be eliminated. This type of conversion practice leads to people reaching a wrong conclusion based on incorrect information.

[dongbadz]

Thank you for the idea... can you send t us the proper way to convert it?

It will be highly appreciated.

thanks a lot

[nike123]

Thank you for the idea... can you send t us the proper way to convert it?

It will be highly appreciated.



thanks a lot

http://www.refrigeration-engineer.com/forums/showpost.php?p=148573&postcount=6