Air conditioning - Any recommendations please?? - Part 2

[LouisSaha]

depend your fan coil unit position at where.
For example plate on toilet door or bedroom above door , get 12k , if direct blowing on bed. 10k good than enough. Energy saving some mor

not gonna mount above door. Will mount directly opposite my bed. So will blow directly.

 

[LouisSaha]

just replaced my 13 yr old pansonic too. i think its batch shelf life.
currently 9k for bedroom is okay and more than enough.

My aircon still working but the compressor outside is making alot of noises.

 

[obichacha]

My aircon still working but the compressor outside is making alot of noises.

Compressor mounting loosen and fan motor magnet time to replace. That is why lot of noise

 

[obichacha]

not gonna mount above door. Will mount directly opposite my bed. So will blow directly.

10k btu good than enough

 

[mark lim]

not gonna mount above door. Will mount directly opposite my bed. So will blow directly.

Balance between drain pipe length and how it runs vs where the unit is sited.

 

[obichacha]

Balance between drain pipe length and how it runs vs where the unit is sited.

Can refer here.

 

[007Mi6]

For bedroom, is 9k btu good enough? Or i should opt for 12k btu?
Time to replace my 13 years old Panasonic aircon with Mitsubishi Electric.

depends on your room size, temp you use, whether got west sun or hot walls.

if old resale, where room is bigger, 9K might not meet your needs.

 

[Andy0601a]

Check page 25
https://www.mitsubishielectric.com....6bd0fbbfde6c/Starmex-R32-Details-Nov-2023.pdf

28VG and 33VG (10+10+18) both are more or less same capacity output.
6.2kw x 3048 = 18.9k btu vs 6.5kw x 3048 = 19.8k btu got any different?
Both maximum capacity 8.9kw x 3048 = 27k btu.

I a bit catch no ball until I look at the max output, thank you for trying to explain.

https://www.mitsubishielectric.com....6bd0fbbfde6c/Starmex-R32-Details-Nov-2023.pdf

Page 18, the nominal cooling rating of the outdoor unit 3H28VG is 6.5kW cooling capacity and 4H33VG 6,9kW cooling capacity.

Page 25 and 27, if you read the table, whether is the 3H28VG or 4H33VG, with 10/10/13 configuration, the nominal output which is also the most efficient and stable output, is not much difference at 6.2kW cooling and 6.5W of cooling for both condensers.


There is no good reason to upgrade in this case as you are only using 3 FCU.

Thank you for the layman explanation

 

[Jun Jun]

Supports capacity =/= perform at max capacity

MKM85VVMG
MKM85VVMG
rated performance with 24+9: 18.6k + 6.5k BTU
MKM85VVMG max performance with 24+9: 22.0k + 7.7k BTU
MKM100VVMG rated performance with 24+9: 21.4k + 7.6k BTU
MKM100VVMG max performance with 24+9: 26.2k BTU + 9.2k BTU

Rated capacity is tested with outdoor temperature at 35C dry bulb in a lab. Singapore clear afternoon temperature in an unshaded space is way hotter. Max capacity is only achievable in fixed, ideal lab conditions.

A 0-tick aircon unit reaching target temperature quicker and getting the inverter to steady state saves more energy than a 5-tick aircon taking longer to reach target temperature and running in steady state.

Sorry to jump in. Currently i am using 9k x 3 under panasonic cu4xu33ybz. Sys 4 compressor

If considering i change to daikin 12k+9k+9k
Under MKM75VVMG for energy saving compared to MKM85VVMG. Is it advisable? I checked with daikin proshops they say 75 is cold enough wont have issues.
Currently is living in 5rms bto.

 

[Jun Jun]

Also because i need the wifi function. Between panasonic vs daikin which one is more recommended for reliability?

 

[Alphas]

Sorry to jump in. Currently i am using 9k x 3 under panasonic cu4xu33ybz. Sys 4 compressor

If considering i change to daikin 12k+9k+9k
Under MKM75VVMG for energy saving compared to MKM85VVMG. Is it advisable? I checked with daikin proshops they say 75 is cold enough wont have issues.
Currently is living in 5rms bto.

Aircon efficiency is when the COP is highest, this typically happens at 50% to 70% load, not 100% load.

 

[Jun Jun]

Aircon efficiency is when the COP is highest, this typically happens at 50% to 70% load, not 100% load.

So which is more recommended?

 

[Jun Jun]

Aircon efficiency is when the COP is highest, this typically happens at 50% to 70% load, not 100% load.

They r both system 4 compressor

 

[Jun Jun]

Aircon efficiency is when the COP is highest, this typically happens at 50% to 70% load, not 100% load.

Also because my sister on her aircon for more than 12 hrs, we want energy saving.

 

[Alphas]

So which is more recommended?

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.

 

[petetherock]

If you’re using the Aircon constantly then I suggest you don’t max out the compressor to save Pennies and spend pounds on electricity and repairs

 

[007Mi6]

Sorry to jump in. Currently i am using 9k x 3 under panasonic cu4xu33ybz. Sys 4 compressor

If considering i change to daikin 12k+9k+9k
Under MKM75VVMG for energy saving compared to MKM85VVMG. Is it advisable? I checked with daikin proshops they say 75 is cold enough wont have issues.
Currently is living in 5rms bto.

depending on your 5rm BTO layout. Some 5rm BTO needs only 12/9/9/24, some needs 12/9/9/12 + 24. Some 12/9/9/18 + 20.

Could you share the following so better things could come to you? I think most people will just share a bit of info.

(1) floor plan with measurement.

(2) Usage pattern for each area

It is just like, your salesperson say Daikin 75 model is cold enough, on what basis is that. Maybe it is correct.

 

[obichacha]

I a bit catch no ball until I look at the max output, thank you for trying to explain.



Thank you for the layman explanation

100% full loads capacity to set on 16c with max fan speed on each room.
Low load minimum work on midnight or during raining night, till next morning. The outdoor condenser fan can tell that spinning in low rpm with quiet noise.
standard rates, set on 25-26c with fan 1/2 bar speeds.
All Aircon specification has mentioned: standard rate with max capacity output. 6.5kw to 8.9kw something.
This is just a guided

 

[Jun Jun]

depending on your 5rm BTO layout. Some 5rm BTO needs only 12/9/9/24, some needs 12/9/9/12 + 24. Some 12/9/9/18 + 20.

Could you share the following so better things could come to you? I think most people will just share a bit of info.

(1) floor plan with measurement.

(2) Usage pattern for each area

It is just like, your salesperson say Daikin 75 model is cold enough, on what basis is that. Maybe it is correct.

I only use 12+9+9. Do not use 24. Just that I was recommend daikin 85 model by gaincity. But among all the proshop that i called too they mentioned model 75 is good enough no need to take 85, and that because 85 is 1kw higher than 75, regardless how many aircon units i turn on, i will end up with more electricity consumption.

 

[007Mi6]

I only use 12+9+9. Do not use 24. Just that I was recommend daikin 85 model by gaincity. But among all the proshop that i called too they mentioned model 75 is good enough no need to take 85, and that because 85 is 1kw higher than 75, regardless how many aircon units i turn on, i will end up with more electricity consumption.

Hi Jun Jun, thanks for your sharing from the pro shop.

Model 75 is nominally rated at 6.0kW or 20.4K BTU (6.0 x 3412), using 1.22kW electricity per hour

Model 85 is nominally rated at 7.0kW or 23.8K BTU, using 1.71kW electricity per hour.

In the above situation, model 75 is more energy saving provided the 20.4K BTU is sufficient. The model 75 provides only 6K BTU to 2 common room and 8.4K BTU to master bedroom.

Which is why in theory, the model 75 is more saving, but it may not meet your primary objective of cooling in the first place without knowing your floor plan. End up, your condenser will have a shorter lifespan, you would likely to use more energy by constantly running at full 100% or higher speed and your rooms are not cooled.

I will end my replies to you as it seems like my questions are invalid and not important to provide in order to give a better suggestion to you