which power specification is correct?

Introductions, general chit chat and off-topic banter.
Post Reply
User avatar
Adverse Effects
Senior Member
Posts: 1172
Joined: Sat, 01 Jan 2011, 03:30
Real Name: Adverse Effects
Location: Brisbane

which power specification is correct?

Post by Adverse Effects »

the Specs say

2.5HP
6kW
15Amps

that cant work can it?

2.5HP = ~1.86kW / 240VAC = ~7.7677Amps
6kW /240VAC = 25Amps
15Amps * 240VAC = 3.6kW

Window Wall Cooling Only Air Conditioner 6kW

Image
If you don't have time to do it right,
When will you have time to do it over

Help those who help themselves first
antiscab
Senior Member
Posts: 3183
Joined: Mon, 26 Nov 2007, 05:39
Real Name: Matthew Lacey
Location: Perth, WA

Re: which power specification is correct?

Post by antiscab »

No power factor correction would be my guess. Also hp wouldnt include fans
Matt
2023 BYD Atto 3 - 21k km
2017 Renault zoe - 147'000km
2012 Leaf - 101'000km - soon to be trialing a booster battery
2007 Vectrix - 197'000km (retired)
2007 Vectrix - 50k km
User avatar
Adverse Effects
Senior Member
Posts: 1172
Joined: Sat, 01 Jan 2011, 03:30
Real Name: Adverse Effects
Location: Brisbane

Re: which power specification is correct?

Post by Adverse Effects »

my point was
how can a 6kW airco have 2.5HP and only draw 15 amps

when
2.5HP = ~1.86kW / 240VAC = ~7.7677Amps
6kW /240VAC = 25Amps
15Amps * 240VAC = 3.6kW

none of those amounts come close to matching
If you don't have time to do it right,
When will you have time to do it over

Help those who help themselves first
User avatar
jonescg
Senior Member
Posts: 4721
Joined: Thu, 21 Jan 2010, 23:05
Real Name: Chris Jones
Location: Perth, WA.
Contact:

Re: which power specification is correct?

Post by jonescg »

Sometimes they refer to the 'cooling power' or the rate of heat removal. That would be closer to 1.8 kW I'd think.
AEVA National President, WA branch director.
T1 Terry
Senior Member
Posts: 1952
Joined: Thu, 30 Sep 2010, 20:11
Real Name: Terry Covill
Location: Mannum SA

Re: which power specification is correct?

Post by T1 Terry »

Cooling/heating kW is not necessarily electrical energy used, the EER or COP comes into play. The current rating is to allow for a stalled compressor so it doesn't trip the circuit breaker every time it cycles back in as the compressor usually stops on a compression stroke.
Soft start air con units bleed off the head pressure and start the fans up before the compressor to stagger the load, inverter technology starts the compressor at a very slow spin after the fans are up to speed so a very soft start. The part that catches a lot of people is that inverter technology air conditioners do ramp up to full load plus a bit until they pull the temp down and only then do they reduce the compressor speed to match the load required. Not unusual to see an inverter technology unit ramp up to a 4kW electrical load for 20 mins after start up before it drops back to as little as a 1.2kW electrical load and then back to maybe 750w if the insulation is good.

T1 Terry
Green but want to learn
User avatar
brendon_m
Senior Member
Posts: 1315
Joined: Sat, 28 Oct 2017, 11:00
Real Name: Brendon McCarrol
Location: Perth, Western Australia

Re: which power specification is correct?

Post by brendon_m »

jonescg wrote: Wed, 07 Nov 2018, 09:48 Sometimes they refer to the 'cooling power' or the rate of heat removal. That would be closer to 1.8 kW I'd think.
This is it, its equivalent to a 6kw bar heater, it's just 200ish% efficient because it's taking energy from the air outside (or inside when cooling) as well as the power lines.
User avatar
Adverse Effects
Senior Member
Posts: 1172
Joined: Sat, 01 Jan 2011, 03:30
Real Name: Adverse Effects
Location: Brisbane

Re: which power specification is correct?

Post by Adverse Effects »

so its a overunity device

takes ~7.7677Amps from the wall (~7.7677Amps * 240VAC = 2.5HP) then outputs 6kW of cooling from the said ~7.7677Amps

so that is a ~322% increase in power over what is put in it from the wall

and so on that math you should be able to string them together and make positive power out put (i know this cant happen but the numbers dont lie LOL )

PS:-no i am not an overunity nutcase
If you don't have time to do it right,
When will you have time to do it over

Help those who help themselves first
User avatar
brendon_m
Senior Member
Posts: 1315
Joined: Sat, 28 Oct 2017, 11:00
Real Name: Brendon McCarrol
Location: Perth, Western Australia

Re: which power specification is correct?

Post by brendon_m »

It's free energy!
Big oil has been keeping it under wraps for years.
User avatar
Johny
Senior Member
Posts: 3749
Joined: Mon, 23 Jun 2008, 16:26
Real Name: John Wright
Location: Melbourne
Contact:

Re: which power specification is correct?

Post by Johny »

brendon_m wrote: Wed, 07 Nov 2018, 15:45 It's free energy!
Big oil has been keeping it under wraps for years.
Not quite but is is true that for the same electrical power input, a heat exchanger provides almost twice the cooling power and about 150% more heat than a purely resistive heater.
The heat pump hot water salesfolk call it "heat from the air" or similar.
User avatar
brendon_m
Senior Member
Posts: 1315
Joined: Sat, 28 Oct 2017, 11:00
Real Name: Brendon McCarrol
Location: Perth, Western Australia

Re: which power specification is correct?

Post by brendon_m »

I think you missed the sarcasm.
However it is technically free energy, you're taking heat energy from the air which power companies haven't worked out how to charge us for (yet), so it's energy for free.
User avatar
Johny
Senior Member
Posts: 3749
Joined: Mon, 23 Jun 2008, 16:26
Real Name: John Wright
Location: Melbourne
Contact:

Re: which power specification is correct?

Post by Johny »

brendon_m wrote: Wed, 07 Nov 2018, 16:52 I think you missed the sarcasm.
.....
Sorry Brendon, I should have read more closely who posted that remark. I know from your previous posts that you wouldn't have been serious. The over-unity debate got pretty hot here a couple of years ago.
User avatar
brendon_m
Senior Member
Posts: 1315
Joined: Sat, 28 Oct 2017, 11:00
Real Name: Brendon McCarrol
Location: Perth, Western Australia

Re: which power specification is correct?

Post by brendon_m »

No worries, I know tone and meaning is lost in text.
User avatar
Adverse Effects
Senior Member
Posts: 1172
Joined: Sat, 01 Jan 2011, 03:30
Real Name: Adverse Effects
Location: Brisbane

Re: which power specification is correct?

Post by Adverse Effects »

brendon_m wrote: Wed, 07 Nov 2018, 15:45 It's free energy!
Big oil has been keeping it under wraps for years.
ROFL
If you don't have time to do it right,
When will you have time to do it over

Help those who help themselves first
User avatar
Richo
Senior Member
Posts: 3737
Joined: Mon, 16 Jun 2008, 00:19
Real Name: Richard
Location: Perth, WA

Re: which power specification is correct?

Post by Richo »

brendon_m wrote: Wed, 07 Nov 2018, 16:52 However it is technically free energy
Yes global warming IS free!
Remember it's only free until you get caught :lol:

We are currently on the buy it now and pay for it later plan :o
And that balloon payment is fast approaching :arrow:
So the short answer is NO but the long answer is YES.
Help prevent road rage - get outta my way!
User avatar
woody
Senior Member
Posts: 1716
Joined: Sat, 21 Jun 2008, 02:03
Real Name: Anthony Wood
Location: Mt Colah

Re: which power specification is correct?

Post by woody »

Better late than never - this is my understanding...

Cooling:
~6kW of heat comes out of the intake air
~2kW comes from electricity
~8kW of heat goes into the outside air
----
0kW sum

Heating:
~7kW of heat goes into the air coming out of the blower
~2kW of that comes from electricity
~5kW of that comes from outside air
----
0kW sum

Current Rating Amps 15A = shouldn't blow the fuse on a 15A circuit - it may go over that momentarily and will be under it by a long way mostly.
Planned EV: '63 Cortina using AC and LiFePO4 Battery Pack
Post Reply