Air conditioning - Any recommendations please??

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chunlianghere

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for non-inverter aircon, that is very true... the outdoor compressor unit doesnt have a variable rotation speed. Even if you turn on one fancoil and two fancoil, it consumes the same...

If you want the prove, you can always check your outdoor electric meter.. use stopwatch to count how many seconds it take to make 1 full rotation with one and two fancoil on for Non-inverter aircon

the power consumption might increase if 2 fancoil. reason is becos the room temp and time taken to the desired temp for the 2 rooms is different.
 

sentosaubin

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the power consumption might increase if 2 fancoil. reason is becos the room temp and time taken to the desired temp for the 2 rooms is different.

Have you tried counting the meter?
I have tried, and they are the same when you just turn on the aircon..
It might be different if one room set at 25 and another set at 16.... lower degree will force the compressor to work non stop
 

chunlianghere

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Have you tried counting the meter?
I have tried, and they are the same when you just turn on the aircon..
It might be different if one room set at 25 and another set at 16.... lower degree will force the compressor to work non stop

yes of cos. both room same temp set at 25.
 

shevchenko

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haha... we hav 2 diff sets of results here!

when i asked 2 salesman at courts, i have 2 diff answers same as u 2 as well! :)
 

thesingingbard

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haha... we hav 2 diff sets of results here!

when i asked 2 salesman at courts, i have 2 diff answers same as u 2 as well! :)

i would've to agree with chunlianghere.

when the desired temperature is reached, the compressor shuts off.

therefore as chunlianghere already stated, the energy needed to cool one room to desired temperature should not be the same as for two rooms.

Obviously when the non-inverter compressor is running, it consumes same amt of power since as stated by sentosaubin it only has one speed (that explains about the counting seconds for each rotation). However, sentosaubin should checked the difference in times the compressor ran to cool one and two rooms.

no offense to salesman out there, but some of them aren't very technical.
 

shevchenko

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So if 2 rms hav exactly same parameters, eg same RM temp, same desired temp set, same RM size etc, the power consumption is same for using 1 or 2 fancoil rite?

Of course in real life can't be exactly the same....but with this knowledge, when I on my RM Aircon, I will ask my parents on as well since the power consumption is not 2 times more, prob only 20% more!
 

sentosaubin

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So if 2 rms hav exactly same parameters, eg same RM temp, same desired temp set, same RM size etc, the power consumption is same for using 1 or 2 fancoil rite?

Of course in real life can't be exactly the same....but with this knowledge, when I on my RM Aircon, I will ask my parents on as well since the power consumption is not 2 times more, prob only 20% more!

Agree with the 20% approximation

and agree with the singingbard here that salesman might not be so technical.. so we still better off doing our own homework.

I remembered buying DVD Player and was told that the USB port can only be used to play JPG file... and actually it can play AVI file as well, but salesman say no no.. My big fault for so trusting the salesman.... so when I buy the next DVD Player, I bring myself the USB with AVI file to test it
 

sentosaubin

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I was comparing day by day when the 2 RM and 1 RM with aircon switched on, and the difference are so negligible.... like 20 kW and 19.5 kW per day... so 20% approximation by shevchenko wont be that far off

i would've to agree with chunlianghere.

when the desired temperature is reached, the compressor shuts off.

therefore as chunlianghere already stated, the energy needed to cool one room to desired temperature should not be the same as for two rooms.

Obviously when the non-inverter compressor is running, it consumes same amt of power since as stated by sentosaubin it only has one speed (that explains about the counting seconds for each rotation). However, sentosaubin should checked the difference in times the compressor ran to cool one and two rooms.

no offense to salesman out there, but some of them aren't very technical.
 

thesingingbard

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I was comparing day by day when the 2 RM and 1 RM with aircon switched on, and the difference are so negligible.... like 20 kW and 19.5 kW per day... so 20% approximation by shevchenko wont be that far off

hm... interesting.

how did you measure the electrical usage?

so in this case, for a non-inverter air-con, the extra electrical energy it took to cool a space twice (2 rm) as large (1 rm) is 20% ?
 

chunlianghere

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hm... interesting.

how did you measure the electrical usage?

so in this case, for a non-inverter air-con, the extra electrical energy it took to cool a space twice (2 rm) as large (1 rm) is 20% ?

actually to wat i tink, the extra electrical for 2 rooms would be the fan coil.

if using larger fan coil, than it could be ~1.5 times more electrical than normal 1 room.
 

shevchenko

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actually to wat i tink, the extra electrical for 2 rooms would be the fan coil.

if using larger fan coil, than it could be ~1.5 times more electrical than normal 1 room.

sorry, i dun understand wat u mean by using a larger fancoil...

so i tink we can conclude that for non inverter aircon, assuming both same size fancoil, temp etc, the pwr consumption is probably abt 20% more for turning on 2 fancoils compared to turning on 1 fancoil :)
 

thesingingbard

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actually to wat i tink, the extra electrical for 2 rooms would be the fan coil.

if using larger fan coil, than it could be ~1.5 times more electrical than normal 1 room.

rite, and i tink you mean the electrical power (or current).

but i was referring to the electrical energy.

just as u had pointed out, the difference in time taken for the compressor to cool 2 rooms versus 1 room to the desired temperature before it 'shuts down' is the correct measure of the energy (kWh) difference.

On a side note, in most controlled tests, the benefit of using an inverter over a non-inverter is 20~40% energy savings. The highest i've seen is the one by Panasonic which reported 50%!
http://panasonic.asia/ecoideas/ecoproducts/air_conditioner02.html

Even 20% is good enough to convince me to change to inverter. :s7:
 

thesingingbard

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sorry, i dun understand wat u mean by using a larger fancoil...

so i tink we can conclude that for non inverter aircon, assuming both same size fancoil, temp etc, the pwr consumption is probably abt 20% more for turning on 2 fancoils compared to turning on 1 fancoil :)

power consumption up by 20% is very plausible.

however, we have to bare in mind power is energy/time. And what we pay is calculated in terms of energy usage [kWh] and not [kW].

so when you first switch on aircon and measure the power-meter, then 20% difference would not be far-fetched.

BUT what is important is how long does the compressor remain turned on (& therefore drawing the bulk of the power) to cool one room versus two?
 

sentosaubin

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You don't know how to measure? The electric meter is just outside... unless yours are concealed, then i have nothign to say.

hm... interesting.

how did you measure the electrical usage?

so in this case, for a non-inverter air-con, the extra electrical energy it took to cool a space twice (2 rm) as large (1 rm) is 20% ?
 

Core2max

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Assuming the capacity of the compressor is 14000 btu (system 2, non inverter).

If turn on 2 aircons, it should be 7000btu x 2 right?
If turn on 1 aircon, it should be 14000btu right?

If it is true, then the desired temp should be reached faster if you turn on only 1 room.
 

thesingingbard

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You don't know how to measure? The electric meter is just outside... unless yours are concealed, then i have nothign to say.

from your earlier post, you mentioned measuring the time it takes for one rotation.

is that how you measure?
 

thesingingbard

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Assuming the capacity of the compressor is 14000 btu (system 2, non inverter).

If turn on 2 aircons, it should be 7000btu x 2 right?
If turn on 1 aircon, it should be 14000btu right?

If it is true, then the desired temp should be reached faster if you turn on only 1 room.

not unless both FCUs can handle 14k btu which is unlikely. so unlikely if only 1 aircon is operating, all the 14k btu goes to it. However that said, it means the 14k BTU compressor will go into more freq start-stops.

however if you scrutinize the specs, most compressor's total BTU is less than all the FCU's BTU combined.

So not surprising, it takes longer to reach desired temperature with all the air-con switched on versus if just one FCU.
 

Core2max

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For aircon, It would be better if you buy the set from aircon specialist... not from electronic shops (i.e. Courts, BD, Fairprice, etc...).

It is because aircon specialist shops normally have thier own installer.
 
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