Air conditioning - Any recommendations please?? - Part 2

[Jun Jun]

For comparison, if you have an existing Panasonic 4XU33YBZ, 9/9/9 configuration will be using 1.52kW per hour compared to 3XU28YBZ at 1.24kW.

Compared to Daikin model 75, which runs at 1.22kW, your savings would be 0.3kW per hour or 3.6kW per day. This is 1314kW per year and $427 per year cost. This is assuming all 3 running for

Is it worth to go the extend to change to Daikin model 75 where the cost savings will take about 8-9 years to recover?

Sorry to disturb again. I am doing final confirmation on the compressor, based on the previous floor plan which compressor should I take presumably I am using 12k+9k+9k?

 

[Jun Jun]

Hi all, may i know what is the power consumption for a 9k + 12k fancoil with 4H33VG compressor running at 24c low fan speed?
Just change my aircon 1 month ago, realise today from sp app that the power consumption increased a lot compared to when just installed.
Any kind soul can help to explain?

This is what I experienced when taking cu4xu33ybz for a few months my consumption is high despite setting to 25 deg. No idea why... still finding the root cause of it as my other appliances usage is about the same.

 

[Jun Jun]

I might seem "crazy" to some people here, but honestly electricity rates are getting higher, we are all trying to fight inflation here. Also I remembered someone told me, aircon best is do calculations to get the right size. Too small not cold, too big high electricity consumption+ higher humidity. Again, this is a forum. Everyone has a freedom of speech. Don't feel like helping can Don't help but pls be kind. We try to help one another.

 

[The_King]

I might seem "crazy" to some people here, but honestly electricity rates are getting higher, we are all trying to fight inflation here. Also I remembered someone told me, aircon best is do calculations to get the right size. Too small not cold, too big high electricity consumption+ higher humidity. Again, this is a forum. Everyone has a freedom of speech. Don't feel like helping can Don't help but pls be kind. We try to help one another.

let me make it simple

your room need 10k btu + your compressor is 10k = 100% load
vs
your room need 10k btu + your compressor is 20k = 50% load

which do u think use more power? a compressor running at FULL load or a compressor running at 50% load?



or my earlier post

12k BTU = 810 watt = 12min to cool down the room = 0.2hr = 0.162kWh = 0.32cent = the amount of power it use to cool down to set temp until operation light is off = $0.05184

18k BTU = 1110watt = 4min to cool down the room = 0.066hr = 0.07326kWh = 0.32 cent = the amount of power it use to cool down to set temp until operation light is off = $0.0234432

i already done the math liao



the only way is to limit your AC, like me, i switch on 5 to 6.5hr per day only + my stand fan is on when i at home.

your fridge also use lot of electricity, unless you switch to chest freezer, a decent brand chest freezer when fully loaded is design to keep it cold for a few days (when there no power). in short it hardly use lot of electricity due to it thermal efficiency.

light, washing machine, standyby power, computer etc......... but that another topic

This is what I experienced when taking cu4xu33ybz for a few months my consumption is high despite setting to 25 deg. No idea why... still finding the root cause of it as my other appliances usage is about the same.

if your is the western sun, the wall will radiating heat even it it 10pm, your windows at night will eat up your cool air (there few way to stop it, double/sec glazing), and at afternoon your windows will let heat pass thur (which is why some put solar flim to reflect the heat away)



if you have many gap like door gap, it will leak cool air, like my room, other then the windows and the wall i try to seal up as many gap as i can

look at my, i seal my door gap (the black thing at door bottom) to prevent as much leak as i can, i cant do anything about the wall and the windows, i plan to diy solar flim or sec glazing

 

[mark lim]

Actually the fridge is quite efficient. Especially the inverter models.
the guzzlers are oven, Aircon, storage heaters left on, kettle flask left on, gaming rigs, induction cookers.
Fans, lights, washing machine with cold water consumes not much

 

[007Mi6]

Sorry to disturb again. I am doing final confirmation on the compressor, based on the previous floor plan which compressor should I take presumably I am using 12k+9k+9k?

This is what I experienced when taking cu4xu33ybz for a few months my consumption is high despite setting to 25 deg. No idea why... still finding the root cause of it as my other appliances usage is about the same.

“Consumption is high” is a very subjective statement. Additional $80 per month using aircon can be a lot for some people, or very little for some people.

You should share current and previous consumption in kWh, usage pattern of aircon at different time.

I don’t go and hunt and remember all the stuff in different portions.

 

[007Mi6]

Hi all, may i know what is the power consumption for a 9k + 12k fancoil with 4H33VG compressor running at 24c low fan speed?
Just change my aircon 1 month ago, realise today from sp app that the power consumption increased a lot compared to when just installed.
Any kind soul can help to explain?

Low speed?

Slow to cool the so the compressor kept working hard to produce gas to the pipes.

Power range from 0.55kWh to 1.90kWh (with current limiter) and 100% load is 1.52kWh

previously you hit the minimum power consumption at 0.55kWh after the room is cooled. However, the start time of the aircon usage will typically use more power to cool the room.

 

[Alphas]

My typical entire house electrical consumption with 2 FCUs(12K + 9K) on a Daikin system 4. Baseline consumption is 0.1 -0.2 KWH for the fridge and other appliances. The compressor will consume the max power at the beginning to cool down the rooms at 8pm, the current will keep failing for the next few hours until it reaches a steady state with a consumption of 0.22KWH on average till the next morning at about 7-8am.

This consumption is very consistent every night when the 2x FCUs are turned on with 24C settings. It’s nonsensical that a compressor with higher cooling capacity will always have higher consumption, it’s only dependent on the efficiency of the coefficient of performance (COP) curve. Aircon system are like PSU in a PC, highest efficiency occurs around 40%-70% load, not 100%.

 

[007Mi6]

My typical entire house electrical consumption with 2 FCUs(12K + 9K) on a Daikin system 4. Baseline consumption is 0.1 -0.2 KWH for the fridge and other appliances. The compressor will consume the max power at the beginning to cool down the rooms at 8pm, the current will keep failing for the next few hours until it reaches a steady state with a consumption of 0.22KWH on average till the next morning at about 7-8am.

This consumption is very consistent every night when the 2x FCUs are turned on with 24C settings. It’s nonsensical that a compressor with higher cooling capacity will always have higher consumption, it’s only dependent on the efficiency of the coefficient of performance (COP) curve. Aircon system are like PSU in a PC, highest efficiency occurs around 40%-70% load, not 100%.

Thanks for sharing.

At the initial stage of cooling, a bigger condenser would have bigger energy use. Assuming all things are the same. These are from technical specs from the manufacturers.

 

[Alphas]

Thanks for sharing.

At the initial stage of cooling, a bigger condenser would have bigger energy use. Assuming all things are the same. These are from technical specs from the manufacturers.

This is a misconception. While a compressor with a low capacity will have a lower initial power, it will require a longer duration to cool the room to the same temperature, the total power consumption will be far higher when it had to operate at 100% load. The current it consumed has to be maintained higher for longer duration due to the 100% load and the efficiency falls as the result.

 

[007Mi6]

This is a misconception. While a compressor with a low capacity will have a lower initial power, it will require a longer duration to cool the room to the same temperature, the total power consumption will be far higher when it had to operate at 100% load. The current it consumed has to be maintained higher for longer duration due to the 100% load and the efficiency falls as the result.

I didn’t say about overall energy will be lesser. so I don’t know where you get that idea from.

I am merely making reference to the endless Jun Jun questions about which condenser and replying to the above post on energy usage.

you will see me always ask for floor plan, usage pattern etc.

I should quantify that I am referring to specifically Starmex 3H28VG vs 4H33VG and Panasonic 3XU28YBZ vs 4XU33YBZ.

Please take a look at their respective product spec.

The question involved here it really depends on (1) the number of FCU running concurrently, (2) the expectations of the user, (3) the size of the rooms to cool and (4) west sun situation.

 

[007Mi6]

Every home will be different.

but there will be some that will think that every home is the same.

Most aircon users will only want to hear what they want to hear (save money, low initial cost).

There are users who prefers system 4 for 5rm, while some 4rm prefers 3+1 (24K single split)

 

[obichacha]

let me make it simple

your room need 10k btu + your compressor is 10k = 100% load
vs
your room need 10k btu + your compressor is 20k = 50% load

which do u think use more power? a compressor running at FULL load or a compressor running at 50% load?



or my earlier post

12k BTU = 810 watt = 12min to cool down the room = 0.2hr = 0.162kWh = 0.32cent = the amount of power it use to cool down to set temp until operation light is off = $0.05184

18k BTU = 1110watt = 4min to cool down the room = 0.066hr = 0.07326kWh = 0.32 cent = the amount of power it use to cool down to set temp until operation light is off = $0.0234432

i already done the math liao



the only way is to limit your AC, like me, i switch on 5 to 6.5hr per day only + my stand fan is on when i at home.

your fridge also use lot of electricity, unless you switch to chest freezer, a decent brand chest freezer when fully loaded is design to keep it cold for a few days (when there no power). in short it hardly use lot of electricity due to it thermal efficiency.

light, washing machine, standyby power, computer etc......... but that another topic




if your is the western sun, the wall will radiating heat even it it 10pm, your windows at night will eat up your cool air (there few way to stop it, double/sec glazing), and at afternoon your windows will let heat pass thur (which is why some put solar flim to reflect the heat away)



if you have many gap like door gap, it will leak cool air, like my room, other then the windows and the wall i try to seal up as many gap as i can

look at my, i seal my door gap (the black thing at door bottom) to prevent as much leak as i can, i cant do anything about the wall and the windows, i plan to diy solar flim or sec glazing

I just notice, your aircon trunking go outside main door?

 

[Jun Jun]

“Consumption is high” is a very subjective statement. Additional $80 per month using aircon can be a lot for some people, or very little for some people.

You should share current and previous consumption in kWh, usage pattern of aircon at different time.

I don’t go and hunt and remember all the stuff in different portions.

Consumption about 200 to 331kwh per month. Using 25 deg and turns on more than 12 hrs.

 

[Jun Jun]

Thanks for sharing.

At the initial stage of cooling, a bigger condenser would have bigger energy use. Assuming all things are the same. These are from technical specs from the manufacturers.

My floor plan 25 deg fan speed 2. 12 to 18hours a day. 200 to 331 kwh on avg for every month. Wonder if 12k+9k+9k a mkm75vvmg is sufficient for cooling and efficient for electricity. As my current 9k+9k+9k and cu-4xu33ybz is guzzling electricity.

 

[007Mi6]

My floor plan 25 deg fan speed 2. 12 to 18hours a day. 200 to 331 kwh on avg for every month. Wonder if 12k+9k+9k a mkm75vvmg is sufficient for cooling and efficient for electricity. As my current 9k+9k+9k and cu-4xu33ybz is guzzling electricity.

Consumption about 200 to 331kwh per month. Using 25 deg and turns on more than 12 hrs.

before aircon how much is your electricity use? No change in pattern?

 

[Jun Jun]

Usage everyday about this pattern. 7am because we cook so 2.5kwh. 10pm when aircon is on another 2kw.

 

[007Mi6]

Usage everyday about this pattern. 7am because we cook so 2.5kwh. 10pm when aircon is on another 2kw.

what is the bill before you had the aircon? Or never tried that before?

 

[007Mi6]

Anyway, your initial power used is rather high, due to the lack of current limiter.after midnight; it seems normal to me that every hour it uses 0.75kW of electricity. This is within my own estimates as long as temp doesn’t go crazy.

it could be due to showering and hot air or other factors not known

 

[The_King]

I just notice, your aircon trunking go outside main door?

Yes outside then to toilet.
Why?


My 2 room got 2 ac sleeve. So 1 fcu each