Air conditioning unit with humidity control

[CLW]

Is there anything available on the Thai market?

I've found out that for example Daikin USA has heat pump units with this humidity control feature.

Couldn't find any other information on website of Thai manufacturers.

Maybe some of you guys have an idea.

Thank you in advance!

[CLW]

Edit: The desired values are 25°C and 50% RH plus/minus.
Adding to the above question, can a regular ac unit achieve these values or do I need a dehumidifier or the other way a humidifier.

[KittenKong]

The sensor on my coffee table indicates that the air in my condo is currently at 26.6 degrees with 54% humidity. That is due to my entirely normal inverter aircon which I leave on all the time.

 

Dehumidification is a normal function of aircons. I dont think you will need anything special.

[CLW]

The sensor on my coffee table indicates that the air in my condo is currently at 26.6 degrees with 54% humidity. That is due to my entirely normal inverter aircon which I leave on all the time.
 
Dehumidification is a normal function of aircons. I dont think you will need anything special.

That would come close to my numbers.
I'm aware the normal ac units remove moisture from the air, I was looking for some control unit where I can set the moisture instead of manually switching through fan speed levels and the dehumidifying mode.

[KittenKong]

11 hours ago, CLW said:

I was looking for some control unit where I can set the moisture instead of manually switching through fan speed levels and the dehumidifying mode.

I've never seen anything like that on domestic air-cons.

I dont use dehumidifying mode at all: the standard cooling mode does both jobs and keeps both the temperature and the humidity very even, which is what I want. In fact I never touch any of the settings on my air-con, apart from the "on/off" switch if I go away for a few days.

Edited July 2, 2019 by KittenKong

[bankruatsteve]

"I've found out that for example Daikin USA has heat pump units with this humidity control feature."

I think the humidity control would be for the heat function (not the cool).

[VocalNeal]

13 hours ago, KittenKong said:

Dehumidification is a normal function of aircons.

It is the primary function of AC. It is called air "conditioning" not air "cooling" But to remove humidity one has to cool the air. 

 

I have seen AC units with a "dry" setting. But not sure what it dries to.

[bankruatsteve]

10 minutes ago, VocalNeal said:

I have seen AC units with a "dry" setting. But not sure what it dries to.

On my Daikin "inverter", the "dry" setting removes the temp setting and puts the unit into what must be the lowest BTU setting it can muster.  It just poofs out cool air every few seconds or so.  I find it great for sleeping and keeps the temp about 25 (guessing).

[Naam]

14 hours ago, CLW said:

That would come close to my numbers.
I'm aware the normal ac units remove moisture from the air, I was looking for some control unit where I can set the moisture instead of manually switching through fan speed levels and the dehumidifying mode.

control units like these exist for conditioning the air of laboratories or manufacturing areas of e.g. chips and pharmaceutical drugs. way too expensive for private use.

[Naam]

1 hour ago, bankruatsteve said:

1 hour ago, VocalNeal said:

I have seen AC units with a "dry" setting. But not sure what it dries to.

On my Daikin "inverter", the "dry" setting removes the temp setting and puts the unit into what must be the lowest BTU setting it can muster.  It just poofs out cool air every few seconds or so.  I find it great for sleeping and keeps the temp about 25 (guessing).

actually the setting is high btu/h (compressor running continously) but intermittent low fan to prevent icing resulting in low evaporator temperature with result high dehumidification.

[bankruatsteve]

1 minute ago, Naam said:

actually the setting is high btu/h (compressor running continously) but intermittent low fan to prevent icing resulting in low evaporator temperature with result high dehumidification.

The unit is rated as "12k BTU" (actually 11k something max).  When in max cooling, it draws about 5 amps more or less.  In dry mode the compressor will sometimes go off but otherwise draws about 1.5 amps.  Whatever.

[CLW]

control units like these exist for conditioning the air of laboratories or manufacturing areas of e.g. chips and pharmaceutical drugs. way too expensive for private use.

Probably talking to some electronic handy friend if he can built a control unit with arduino and sensors that regulate the fan speed of the ac unit and switching between cooling and dehumidifying mode.
Need to run some trials for that.

[bankruatsteve]

2 minutes ago, CLW said:

switching between cooling and dehumidifying mode.
Need to run some trials for that.

Are those separate modes?  And how would they be switched?

[CLW]

Are those separate modes?  And how would they be switched?

You can see that on the remote control of your ac. Even the oldest and simple models have three modes: fan only, cooling, dehumidifying. For fan and cooling you can adjust the fan speed. Dehumidifying is set internally.

Several videos and manuals available on the Internet how to control your regular ac unit other than the remote control.
Works by replacing the wiring of the IR sensor and the control board with for example arduino or raspberry pi.

[bankruatsteve]

40 minutes ago, CLW said:

You can see that on the remote control of your ac. Even the oldest and simple models have three modes: fan only, cooling, dehumidifying. For fan and cooling you can adjust the fan speed. Dehumidifying is set internally.

Several videos and manuals available on the Internet how to control your regular ac unit other than the remote control.
Works by replacing the wiring of the IR sensor and the control board with for example arduino or raspberry pi.

Oh, THAT mode(s).  OK.  I was thinking cooling dehumidifies and dehumidify still cools so...  

[CLW]

Oh, THAT mode(s).  OK.  I was thinking cooling dehumidifies and dehumidify still cools so...  

They both do. Has to do with physics. Psychrometric chart if you're interested.

[Naam]

1 hour ago, CLW said:

Probably talking to some electronic handy friend if he can built a control unit with arduino and sensors that regulate the fan speed of the ac unit and switching between cooling and dehumidifying mode.
Need to run some trials for that.

forget about it. cooling always means dehumidifying and vice versa dehumidifying means compressor running = cooling. the control unit i was referring to can also increase humidity to a set level needs a water source. nowadays aircons which have a dehum setting are quite efficient. no need to reinvent the wheel or force dehumidification till pieces of ice break the fan blades. been there, done that and got the t-shirt.

[CLW]

forget about it. cooling always means dehumidifying and vice versa dehumidifying means compressor running = cooling. the control unit i was referring to can also increase humidity to a set level needs a water source. nowadays aircons which have a dehum setting are quite efficient. no need to reinvent the wheel or force dehumidification till pieces of ice break the fan blades. been there, done that and got the t-shirt.

Sorry I forgot to mention that this all only makes sense if the RH values are above the desired range.
You're right, if below you would need a separate humidifier.

[Naam]

2 minutes ago, CLW said:

Sorry I forgot to mention that this all only makes sense if the RH values are above the desired range.
You're right, if below you would need a separate humidifier.

in Thailand you humidify by opening one or more windows.

[CLW]

in Thailand you humidify by opening one or more windows. [emoji2]

I had similar idea. Triggering a duct fan (the ones that are usually installed in restrooms) that brings some humid outside air into the room.