HP to kW Airconditioner
John
Can someone equate the relationship between an 18 kW output Air Conditioner,
variously described by two contractors, as a 6hp and a 7hp.
Who, if either, is correct?
Kind Regards, John
Darryn Watson
John wrote in message ...
>Hi All.
>
>Can someone equate the relationship between an 18 kW output Air
Conditioner,
>variously described by two contractors, as a 6hp and a 7hp.
>
If you know the input watts of the compressor divide it by 746 and it will
give you the size in hp. Mostly its just marketing BS to make one unit
sound better than the other.
A couple of years ago we were selling an 8.0 kW High walll split which the
manufacturer classed as a 3.0 hp last season the same unit still 8.0 kW was
marketed as a 3.5 hp!!!!!!!
Looking at the energy efficiency rating is more revealing ie how many watts
cooling/heating for haw many watts of input
HTH
Darryn
Kestas
Conditioner,
>variously described by two contractors, as a 6hp and a 7hp.
May be hp mean horse power for compresor in outside unit, kW mean
conditioner capacity.
>Kind Regards, John
Kestas
Greg
produce for a split second. It is just marketing to make
the air conditioner sound more powerful only go by the
kilowatts
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ghandi
spoken about as so many horse power of refrigeration , one HP
means 12000 BTU's , in that sense . One HP electrically is 746
watts or decimal 746 kilo watts . On the compliance plate the
amperage of the compressor will be displayed ....so multiply the
voltage you have by the amps (make sure the fan amps is not
included) and you will get the watts of the compressor . If your
still confused well ....that is where the bastards in sales want
you to be ..........!!!!
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Rusty
<rimtack...@diesel.net.au.invalid> wrote:
>Back in the pre edible underpants days all refrigeration was
>spoken about as so many horse power of refrigeration , one HP
>means 12000 BTU's , in that sense . One HP electrically is 746
>watts or decimal 746 kilo watts . On the compliance plate the
>amperage of the compressor will be displayed ....so multiply the
>voltage you have by the amps (make sure the fan amps is not
>included) and you will get the watts of the compressor . If your
>still confused well ....that is where the bastards in sales want
>you to be ..........!!!!
>
If you multiply amps by volts for the compressor you get volt-amps,
not watts. Watts are only obtained if the load is purely resistive
and an electric motor is far from this.
Franz Boeck
ghandi <rimtack...@diesel.net.au.invalid> schrieb in im
Newsbeitrag: 0e7c2cf8...@usw-ex0103-023.remarq.com...
> Back in the pre edible underpants days all refrigeration was
> spoken about as so many horse power of refrigeration , one HP
> means 12000 BTU's , in that sense . One HP electrically is 746
> watts or decimal 746 kilo watts . On the compliance plate the
> amperage of the compressor will be displayed ....so multiply the
> voltage you have by the amps (make sure the fan amps is not
> included) and you will get the watts of the compressor . If your
> still confused well ....that is where the bastards in sales want
> you to be ..........!!!!
>
> * Sent from RemarQ http://www.remarq.com The Internet's Discussion
Network *
> The fastest and easiest way to search and participate in Usenet -
Free!
Pls. let me correct: one HP means to move 75 kp (kiloponds) 1 meter in
one second.
According to earth acceleration g = 9.80665 m/sec^2, one HP calculates
9.80665 m/sec^2 * 75 kpm/sec = 735,49875, rounded 736 watts or 0,736
kW.
I could not resist this correction since I've heard about the value of
746 watts
once more in this NG.
Greetings from Vienna, Austria from
Franz Boeck
Franz Boeck
Rusty <rto...@oanet.com> schrieb in im Newsbeitrag:
391197a...@news.oanet.com...
> On Wed, 03 May 2000 20:30:06 -0700, ghandi
> <rimtack...@diesel.net.au.invalid> wrote:
>
> >Back in the pre edible underpants days all refrigeration was
> >spoken about as so many horse power of refrigeration , one HP
> >means 12000 BTU's , in that sense . One HP electrically is 746
> >watts or decimal 746 kilo watts . On the compliance plate the
> >amperage of the compressor will be displayed ....so multiply the
> >voltage you have by the amps (make sure the fan amps is not
> >included) and you will get the watts of the compressor . If your
> >still confused well ....that is where the bastards in sales want
> >you to be ..........!!!!
> >
> If you multiply amps by volts for the compressor you get volt-amps,
> not watts. Watts are only obtained if the load is purely resistive
> and an electric motor is far from this.
you are correct, but you probably diffuse: the international
engineering
unit for power is of coarse watt, calculated as work (wattseconds)
divided
by time, therefore seconds are canceled from engu and watt remains.
When you have to calculate the power of an electrical motor for a fan
or
a chiller, you have tho know the mechanical power, used by the axle.
Next, you have to add the loss for belts, motor cooling fan, and other
mechanical depending circumstances. You then get the required power
for your drive. Of coarse, you have to order the next largest model
available.
Drive power of motors is usually given as electrical power value,
calculated
P(ower) in [W] = U (Voltage in [V]) * I (effective current in [A]) *
1,73 * Cos.Phi.
Since Cos.Phi represents a trigonometric angel between effective
current and
incomprehensive current, therefore always greater than 0 and less than
1 at
non-resistive electrical loads.
So keep in mind that the required electrical power must always be at
least
1.3 times higher than the required mechanical power at consumption
axle.
HTH and greetings from Vienna, Austria from
Franz Boeck
Nick Pine
>Pls. let me correct... one HP calculates... 736 watts...
American horses are 746 watts. Those must be smaller metric horses.
Nick
Nick Pine
>...Cos.Phi represents a trigonometric angel between effective
>current and incomprehensive current, therefore always greater
>than 0 and less than 1 at non-resistive electrical loads...
>keep in mind that the required electrical power must always be
>at least 1.3 times higher than the required mechanical power
>at consumption axle.
But the angel doesn't affect the real power, no?
Nick
Dan Duddy
(The electrical equivalent of which is 746 Watts)
12,000 Btuh is one refrigeration ton. No matter what refrigerant, what
suction, what discharge, what .......
12,000 Btuh is one refrigeration ton.
One refrigeration ton does not universally equate to one horsepower.
Horsepower required depends on particular refrigerant, suction, discharge,
mass flow rate, etc.
An AC operating w/R22, power needed is near 1HP per Ton of refrigeration,
but
Not necessarily so (and generally not) for other applications.
Horsepower required is output of compressor.
Nameplate amps x volts x power factor will give input power to
compressor, not output.
(Amps x volts x power factor x efficiency)/746 will give approximate
horsepower out of compressor.
Neither power factor nor efficiency are to be found on nameplate.
> ...
> > Back in the pre edible underpants days all refrigeration was
> > spoken about as so many horse power of refrigeration , one HP
> > means 12000 BTU's , in that sense .
> On the compliance plate the
> > amperage of the compressor will be displayed ....so multiply the
> > voltage you have by the amps (make sure the fan amps is not
> > included) and you will get the watts of the compressor .
>
>
> Pls. let me correct: one HP means to move 75 kp (kiloponds) 1 meter in
> one second.
Not correct definition
>
> According to earth acceleration g = 9.80665 m/sec^2, one HP calculates
> 9.80665 m/sec^2 * 75 kpm/sec = 735,49875, rounded 736 watts or 0,736
> kW.
Mixing MKS and FPS units????
>
> I could not resist this correction since I've heard about the value of
> 746 watts once more in this NG.
>
You heard correct
Franz Boeck
<snip a lot...>
Dan Duddy <h4v8...@coastalnet.com> schrieb in im Newsbeitrag:
39189D02...@coastalnet.com...
> And I always thought the horsepower was 33,000 foot-pounds per
second.
> (The electrical equivalent of which is 746 Watts)
> 12,000 Btuh is one refrigeration ton. No matter what refrigerant,
what
> suction, what discharge, what .......
> 12,000 Btuh is one refrigeration ton.
>
> (Amps x volts x power factor x efficiency)/746 will give approximate
> horsepower out of compressor.
I wrote...
> > Pls. let me correct: one HP means to move 75 kp (kiloponds) 1
meter in
> > one second.
>
> Not correct definition
O.k. let me say: to _shift_ 75 kp 1 m in 1 sec.
> > According to earth acceleration g = 9.80665 m/sec^2, one HP
calculates
> > 9.80665 m/sec^2 * 75 kpm/sec = 735,49875, rounded 736 watts or
0,736
> > kW.
>
> Mixing MKS and FPS units????
MKS units? FPS units?
I only know about ISO: International Standards Association (used in
whole Europe
except Great Briatan, AFAIK).
Reading about _horse power, BTUh, Inch, BTU's, PSI_ and so on I'm
wondering
about how you got to moon in 1968, using those horrible engu's, none
of them
convertible by scientific factors with the power of ten, isn't it?
> > I could not resist this correction since I've heard about the
value of
> > 746 watts once more in this NG.
> >
>
> You heard correct
Thank you for confirmation. I'll void to enter an unknown (IMHO:
crazy)
"engineering units world" and have learned to threat people, who are
able to calculate
using them correctly with a lot of more respect since until now ...
Greetings from Vienna, Austria from
F.Böck
Don Ocean
Franz Boeck wrote:
The way to the Moon was paved by our German Engineers...Whom can use all
systems of measurement.....And A lot of money! Amazing how well you can
measure in any system when there is a lot of motivation(Money). ;-) So how
are things in Austria?
Dan Duddy
FPS - feet, pounds, seconds. The english system
Franz Boeck wrote:
Gene Nygaard
"Franz Boeck" <f.b...@utanet.at> wrote:
> Hi Ghandi,
>
> ghandi <rimtack...@diesel.net.au.invalid> schrieb in im
> Newsbeitrag: 0e7c2cf8...@usw-ex0103-023.remarq.com...
> > spoken about as so many horse power of refrigeration , one HP
> > amperage of the compressor will be displayed ....so multiply the
> > voltage you have by the amps (make sure the fan amps is not
> > still confused well ....that is where the bastards in sales want
> > you to be ..........!!!!
> >
> Network *
> > The fastest and easiest way to search and participate in Usenet -
> Free!
>
> one second.
> 9.80665 m/sec^2 * 75 kpm/sec = 735,49875, rounded 736 watts or 0,736
> kW.
>
> 746 watts
> once more in this NG.
>
>
It's just two different horsepower units. The Pferdestärke or
cheval-vapeur of continental Europe is the 735.49875 W you give, the
English horsepower is the 745.700 W unit that others are using. BTW,
this unit was created by James Watt, for whom the SI unit of power is
now named.
--
Gene Nygaard
http://ourworld.compuserve.com/homepages/Gene_Nygaard/
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