Air conditioning - Any recommendations please?? - Part 2

[a4973]

I like Japan pana model than local design.
in Japan have more features and functions

Just like their fancy feature full pedestal toilet with heating, all kinds of spray patterns etc.

 

[obichacha]

Just like their fancy feature full pedestal toilet with heating, all kinds of spray patterns etc.

hahah, that one not cheap at all, went to their big camera outlet shops, the pricing for whole toilet bowl with spray and heating around 850,000 yen = 8.5k in sgd

 

[ZacharyA]

Hi, sharing a link. I cannot claim true or not true.



RT to kW

https://www.rapidtables.com/convert/power/ton-to-kw.html

kW to BTU

https://www.rapidtables.com/convert/power/kW_to_BTU.html

1 RT = 3.516kW

1kW = 3.412K BTU

in short, 1 RT = 12K BTU

RT kW BTU are different ways to see cooling capacity in different region. Just like miles vs kilometres

Got it. I think the tricky part is to see / calculate the actual output when it is at full capacity which takes a bit of understanding to read the data table.

A lot of AC salesman will tell you to get 9k BTU common room, 12k BTU master, 18/24k BTU living room. But most will fail to explain why a single system (System 3 / 4 / 5) isn't ideal or realistic using figures to explain at full capacity.

 

[ZacharyA]

It’s better to have a higher cooling capacity and operate with higher efficiency rather than a lower capacity and operating at 100% load. So its MKM85VVMG for system 4.

I agree with this. I am currently using a system 3 compressor but only connected to 2 FCUs (12+9) in my parent's flat and it's more than sufficient.

If usage is not concurrent, but either one or the other, then I suppose we can make do with a "standard" System 4 compressor to power 2 bedrooms (12+9 / 9+9) + 1 living room (18/22/24)?

I am still quite torn between getting a System 4 / System 5 / System 2 + System 3. Costs is one concern since 2 systems will cost about $1k more than a Sys 4 / 5.

The issue is my living room, which is a 6m x 5m configuration with 2 standing desks facing the living room window for home office / work station. If I can do a partition of sorts (or glass sliding / foldable doors) to isolate the area, then I'd prefer a 9k BTU FCU to power the small office area, and a 18k for the rest of the living room (which might eat into some parts of the dry kitchen area, unless I add another door to isolate the area).

Otherwise, open concept no isolation of home office and kitchen, will need a big FCU like 24k which long term zaps a lot of power if need AC during warm afternoon.

Dilemma...

 

[mark lim]

a thick curtain will be the most cost effective way to block. anyway unless you are going to switch on 24/7 the savings in power consumption might not make up for the reno you need to do to add a partition. assuming you need to partition 5m.
i would still use 2 FCU, but have the 9k one blowing at the location of the desk. so switch on both 18 and 9k to reach set temp, then have the 9k working alone. maybe can save some.

 

[mark lim]

With regards to Daikin model 75 or Starmex 3H28VG or Panasonic 3XU28YBZ, Daikin has the lowest power consumption with 1x 9K/12K FCU among all 3 brands, at 0.22kWh

have used both daikin and starmex 12k single splits R410, in different rooms but at the same time. the current consumption of the starmex is higher in the catalog but set temp is always 24 for daikin and 25 for starmex, to achieve a similar coldness feel. the FCU blower strength is also stronger with the starmex.
i guess what i am saying is catalog spec vs real life use is different, dont bother too much about it. this 0.22kwh might not even be what it is in actual use case.

 

[mark lim]

I agree with this. I am currently using a system 3 compressor but only connected to 2 FCUs (12+9) in my parent's flat and it's more than sufficient.

actually if you can install 2 compressors, a single split 12K and single 9k will be cheaper and have better redundancy, since they are independent.

 

[ZacharyA]

a thick curtain will be the most cost effective way to block. anyway unless you are going to switch on 24/7 the savings in power consumption might not make up for the reno you need to do to add a partition. assuming you need to partition 5m.
i would still use 2 FCU, but have the 9k one blowing at the location of the desk. so switch on both 18 and 9k to reach set temp, then have the 9k working alone. maybe can save some.

Good idea, I might just do a top track curtain just to isolate the area. And if the FCU is blowing directly towards the 2 standing desks (facing window), then actually don't need to turn on the other one cooling the other common areas in the living room (sofa, TV, dining table).

Will give it a thought. Ultimately, there is no West facing sun, North South facing unit (living room windows facing South) and kitchen windows facing North. So actually on most days can rely on just the wind + corner fan.

 

[ZacharyA]

actually if you can install 2 compressors, a single split 12K and single 9k will be cheaper and have better redundancy, since they are independent.

We live in a 3 room flat with only 1 area for mounting (kitchen side bedroom) and the other bedroom is common corridor. So cannot.

 

[obichacha]

We live in a 3 room flat with only 1 area for mounting (kitchen side bedroom) and the other bedroom is common corridor. So cannot.

My old flat used system 3, the condenser can only placed on master bedroom below window.
Flat design has longer kitchen layout, door for kitchen to separated living and kitchen.
18k on living very efficient. For 2 bedroom size are equally, 10k more than enough.

 

[Jun Jun]

I like Japan pana model than local design.
in Japan have more features and functions

Ya lo. Agree sia. So pretty!

 

[Jun Jun]

I like Japan pana model than local design.
in Japan have more features and functions

Local one the design is nice. Quality still not there. Think there is some improvement? But not enough. The concept is there. But the quality needs to buck up.

 

[obichacha]

Local one the design is nice. Quality still not there. Think there is some improvement? But not enough. The concept is there. But the quality needs to buck up.

don’t think pana will have any improvement.
Pana always cutting cost and pricing never go up to meet up overall markets.
Previously I support pana fridge and washer as well. Also tv.
Now change to hitachi fridge , tv oled LG and washer Bosch.
No more pana item in my house.
The best pana is after replaced name from
National to pana, during that time for everything are durable with premium quality out there.

 

[007Mi6]

have used both daikin and starmex 12k single splits R410, in different rooms but at the same time. the current consumption of the starmex is higher in the catalog but set temp is always 24 for daikin and 25 for starmex, to achieve a similar coldness feel. the FCU blower strength is also stronger with the starmex.
i guess what i am saying is catalog spec vs real life use is different, dont bother too much about it. this 0.22kwh might not even be what it is in actual use case.

Not disagreeing with you, it could be significant in certain situations.

For example if most of the time is 1 FCU running and 2 common room not running. Where the 2 common rooms are occasionally being used when guests or parents come over. It does make sense to look at how low it can go when on steady state.

of coz, most of the time the energy savings is not that significant

 

[Jun Jun]

Also because currently i am using 9kx3. Would 12k+9k+9k be better than current setup in terms of cooling and efficiency? Paired with daikin 75 compressor

 

[mark lim]

with the 12k it will cool faster.

 

[mark lim]

Not disagreeing with you, it could be significant in certain situations.

For example if most of the time is 1 FCU running and 2 common room not running. Where the 2 common rooms are occasionally being used when guests or parents come over. It does make sense to look at how low it can go when on steady state.

of coz, most of the time the energy savings is not that significant

maybe just to share that even for inverter the compressor can shut off completely and it does this quite often when the set temp is reach and when even at the lowest 1.4kw cooling is still too high. from the catalog 3H28 lowest capacity is 1.4kw with a single 2.5kw FCU running. for Daikin it is 0.8kw for a similar single 2.5kw running alone. but i know my starmex shuts off the compressor when set temp is reached for some time, so i guess not much diff power consumption in the end.

 

[obichacha]

Also because currently i am using 9kx3. Would 12k+9k+9k be better than current setup in terms of cooling and efficiency? Paired with daikin 75 compressor

Daikin MKM75VVMG without 8.5A limitation.
2.5+2.5+5 (6kw to 8.75kw) 20k to 29.8k BTU
With 8.5A limits (6-7.17kw) = 24,464 btu maximum load.
When during installation , try to max out that btu limitation of 8.5A amp to 11A , much quickly to reaching cooling power.

 

[007Mi6]

maybe just to share that even for inverter the compressor can shut off completely and it does this quite often when the set temp is reach and when even at the lowest 1.4kw cooling is still too high. from the catalog 3H28 lowest capacity is 1.4kw with a single 2.5kw FCU running. for Daikin it is 0.8kw for a similar single 2.5kw running alone. but i know my starmex shuts off the compressor when set temp is reached for some time, so i guess not much diff power consumption in the end.

Interesting. Thanks for sharing

 

[obichacha]

with the 12k it will cool faster.

12k, I install on my dining area, this is cooler, eating steamboat no issue.