compressor conversion thread

Alot of people are asking for conversions so put 'em here.
:google: is your friend :)

http://www.convert-me.com/ energy conversions

watts x 0.00133 = HP

1 horsepower = 745.699872 watts (power, energy/time)

1 watt = 3.41214163 BTUs per hour (heat transfer)

1 ton of ice = 12,000 BTUs per hour (heat transfer)

1 ton of ice = 3517 watts (heat transfer)

For converting BTUs to Tonns:

(1 / 12,000) * Zbtu/h = T%

Where Z = Your BTU rating
T% = Tonnage in a percent

Quote:

---

Originally Posted by epion2985

There is a problem here, alot of people dont understand that a 1hp compressor for example, doesnt mean it is rated at 1hp (2545btu/h) with respect to heat moved.

Watts, HP, btu/h all measure the same thing, power, which is energy over time. However there are two different systems to consider. There is the power of the compressor motor, thats one thing. Then there is power with respect to heat moved, thats another thing. The first one does not equal the second.

So dont assume your 1/2hp compressor is rated at 1272.5Btu/h, because its not. The rating for motor power and power with respect to heat moved by the system are very different things.

Further more yes the power with respect to heat moved by the system is a function of the compressor motor power but thats not the only variable, there are many others that impact the result.

So be carefull what you convert.

---

Quote:

---

Originally Posted by Gray Mole

Right, one question I see sometimes, and it's about the lower 'BTU' ratings, that I thought would be good to answer in here.

For instance, you have a 850BTU low temp compressor.

That's not much is it? Or is it?

Generally compressors are rated to what they do. So having one that's rated to Ashrae or Cocemaf whatever will read a lot lower than one rated to higher temps.

So, if you have 850BTU at -25 (Cecomaf) for instance as your rating, then you have around 250w of heat removal at -25.

That would put it at the approximately 1/3HP range for a compressor.

So it's a good idea to look at the spec sheet of the compressor you're looking at, and check what the heat removal is at the temperature that you'd actually be using it at.

Then the HP rating and all that starts to make more sense, because the rating of a compressor and what it actually translates into for YOU can look a lot different when you look deeper into the real spec of the compressors.

---

For converting BTUs to Tonns:

(1 / 12,000) * Zbtu/h = T%

Where Z = Your BTU rating
T% = Tonnage in a percent

1 horsepower = 745.699872 watts (power, energy/time)

1 watt = 3.41214163 BTUs per hour (heat transfer)

1 ton of ice = 12,000 BTUs per hour (heat transfer)

1 ton of ice = 3517 watts (heat transfer)

Wow, that post pretty much sums it up now people can do a search for conversions and not make as many posts of the same thing! Thanks!

This thread should be sticky, I have sent pm to man, who can sticky it :D

DONE :D

As per request, it is stuck.

If I may make a suggestion? As posts get placed, the original poster edit in the info that is requested and is viable for the thread.

I will keep an eye in this thread and if it doesnt seem to go anywhere or get updated, I will unstick it. ;)

This is a bit early really to stick the thread, which makes me a bit hesitant, but I am hoping it proves to be a worthwhile thread.

So make the sticky worth it!

Right, one question I see sometimes, and it's about the lower 'BTU' ratings, that I thought would be good to answer in here.

For instance, you have a 850BTU low temp compressor.

That's not much is it? Or is it?

Generally compressors are rated to what they do. So having one that's rated to Ashrae or Cocemaf whatever will read a lot lower than one rated to higher temps.

So, if you have 850BTU at -25 (Cecomaf) for instance as your rating, then you have around 250w of heat removal at -25.

That would put it at the approximately 1/3HP range for a compressor.

So it's a good idea to look at the spec sheet of the compressor you're looking at, and check what the heat removal is at the temperature that you'd actually be using it at.

Then the HP rating and all that starts to make more sense, because the rating of a compressor and what it actually translates into for YOU can look a lot different when you look deeper into the real spec of the compressors.

Cheers

Gray

http://img415.imageshack.us/img415/4710/hp1ck.jpg
i thought this might be appropriate

Yay! it got stickeyed, and i can't really copy the pic so it stays there till i host it

yes you can, just copy/paste this vbcode in:
[img]http://img415.imageshack.us/img415/4710/hp1ck.jpg[/img]

but it's still using his[/her{you really cant tell on these forums}] account

There is a problem here, alot of people dont understand that a 1hp compressor for example, doesnt mean it is rated at 1hp (2545btu/h) with respect to heat moved.

Watts, HP, btu/h all measure the same thing, power, which is energy over time. However there are two different systems to consider. There is the power of the compressor motor, thats one thing. Then there is power with respect to heat moved, thats another thing. The first one does not equal the second.

So dont assume your 1/2hp compressor is rated at 1272.5Btu/h, because its not. The rating for motor power and power with respect to heat moved by the system are very different things.

Further more yes the power with respect to heat moved by the system is a function of the compressor motor power but thats not the only variable, there are many others that impact the result.

So be carefull what you convert.

wow... i thought my thread that was stickeyed got deleted

I think this thread should stay stickied

FYI, I also use www.convert-me.com for power, energy, and pressure conversions.

Quote:

---

Originally Posted by LukeXE

This thread should be sticky, I have sent pm to man, who can sticky it :D

DONE :D

---

STICKY !!!! You should have all those numbers memorized . :fact: So get too it