Econometrician PM230: notes on the operation

[Capt_Maloche]

Ben swarms before it curdles

Come early results, quite amazing for a camera of this price: Split System Inverter R410A 3500W given to medium and max 5300W

Split adjusted low speed (so oversized heat exchangers)
Low speed in Eco mode, 3 + ° C outside to 21h00
Power consumption indicated by the PM 230: 565W 228V 50Hz cos Phi: 0.98 2.54A (extra info)

blow surface of the indoor unit: x 0.60 0.08 m²
Average speed measured on 12 points: 5.1 m / s
Is a flow 880m3 / h

T ° uniform blowing 32 ° C
T ° recovery 22 ° C (installed in the upper part)


an actual power output of 880 0.34 x x (32-20) W = 2992
COP = 2292 / 565= 5.2 quite the cattle

[I Citro]

... or a real power supplied of 880 x 0.34 x (32-20) = 2992 W
COP = 2292 / 565= 5.2 quite the cattle

Impressive. You can say more about the device.

[Christophe]

blow surface of the indoor unit: x 0.60 0.08 m²
Average speed measured on 12 points: 5.1 m / s
Is a flow 880m3 / h

How did you measure the air velocities?

an actual power output of 880 0.34 x x (32-20) W = 2992

? where does 0.34 come from?

For me, all at 20 ° C to simplify (no big differences):

Air density at 20 ° C = 1.2 kg / m3
Air heat capacity at 20 ° C = 1000 J / kg.K °

So volume heat capacity of air at 20 ° C = 1000 / 1.2 = 833 J / m3.K °

We would therefore find: 880/3600 * 833 * (32 - 20) = 2443 W

It doesn't change much but at least we understand the calculation

But I still have a doubt about the flow measurements ... finally the order of magnitude is there ...

Could you do the same in the other speeds to see?

[Capt_Maloche]

AIE Aie Aie !

But I still have a doubt about the flow measurements ... finally the order of magnitude is there ...

No, I don't allow you to doubt, you just have to come see I measured the air speeds with my Kimo hot wire anemometer, temperature measurements with the same equipment

So for dummies

0.34 is a contraction of the specific heat of air 20 50% ° C widely used in the business

Then the power P = (Q v / 3600) x Cp x x Ro DT is the full form.

P [W]
Qv [m3 / h]
Cp [J / kg.K]
Ro [kg / m3]
DT [K]

Typical values ​​are: http://www.thermexcel.com/french/tables/massair.htm
Cp = 1000 [J / kg.K]
Ro = 1.25 [kg / m3] you can quibble with 1.20

This explains the formula used most commonly:
= P x Q v x 0.34 DT (where 0.34 1000 * = 1.25 / 3600)

Assume the constant Pc and Ro values.

This power formula is valid for hot and cold batteries batteries if the condensation does not occur. (If condenstation take the enthalpy difference).

Are you sure you still want to doubt? come and taste my Chateau Pénin to see

[Christophe]

No, I don't allow you to doubt, you just have to come see I measured the air speeds with my Kimo hot wire anemometer, temperature measurements with the same equipment

Roh what susceptibility!

I didn't know that the gentleman was so well equipped ... with an air flow meter! Ok for the rest (I understood for 0.34 it was for the others eh ...)!

So how many kWh have you been since connecting the PM?

What should you see on your gallery? Your synthesis on the house (almost) autonomous in heating (you forget the watts for solar pumps and circulators ...), but I don't understand the image ...

[Capt_Maloche]

Rhâââ! I’m looking for him there!

I'm at 9KW.h for 24 hours of operation, it's ok for 00 ° C last night and around 0 ° C in the afternoon, or 12ct euro

Here is how it is installed inside:

you can see the PM230 to the left of the chute

You see, the indoor unit is placed above the entrance door in the hall which serves the whole house
bottom right the kitchen, left the bottom Sat stay right the downstairs bedroom (not the closet), left the office and I took the photo at the foot of the staircase leading upstairs

[I Citro]

... my Kimo hot wire anemometer, temperature measurements with the same equipment ...

My parents-in-law live next to the Kimo factory ... A sacred box that produces sacred stuff.
They are growing.

We refuse nothing ...

[Christophe]

I'm at 9KW.h for 24 hours of operation, it's ok for 00 ° C last night and around 0 ° C in the afternoon, or 12ct euro

Operating 24h on how many days? When I met 1 able pm I always put a post it close with the start time and date measurements.

Here is how it is installed inside:
you can see the PM230 to the left of the chute

I see mostly hit Bouchou brass hung left!
This is an emergency? Ah unless this is a nutcracker ???

You see, the indoor unit is placed above the entrance door in the hall which serves the whole house, right bottom kitchen, left bottom living room, right bedroom downstairs (not the closet), left the office and I take the photo at the bottom of the stairs going upstairs

Ah I saw it more "open" from what you were saying ... the inverter has an "effect" in the kitchen for example and on the 1st floor? Well, you will tell me it's extra ... obviously!

[Christophe]

I who come to invest in a gas condensing boiler ... I wonder if your choice is not cheaper than gas ... The kWh of gas was € 7 2008 percent but it blazed in 2009 (the price of subscription doubled ).

2-3 things to "reassure" you:

a) the Maloche inverter is extra for the off-season, it still has an oil boiler! You never heat a house (except passive or semi) with a single small unit of this type!

b) your gas boiler should logically have a longer lifespan (well, some are slamming in less than 10 years, a shame !!!!!)

c) the price of electricity will also go up

Wait a few months, as you say, to have the overall balance of consumption of Maloche (elec + fuel oil) reported to the DJU ... and we will see if it is, in EP or not EP, really interesting ... but it is sure that if its battery holds 10 years it will be largely profitable ... economically at least!

ps: we are all the same damn HS, hey Maloche you don't want to do a specific subject on your "thermal at U235"?

[I Citro]

ps: we are all the same damn HS, hey Maloche you don't want to do a specific subject on your "thermal at U235"?

Yes we are HS, but that's not a reason ...
I say no nasty things to Maloche Good ok, I RIDE the U235 ... And not bad even, already 20.000km