Split AC Keeps Freezing over in exercise room

[atpeace]

11 minutes ago, GammaGlobulin said:

 

Don't worry about the cold front, something that I am aware is now approaching, and here already, actually.

 

Anyway, in fact, you CAN test during the cold front.

 

All you need is a small space heater.

 

Before you begin this test, measure the humidity in the room.

 

a. Set the heater to about 1200 watts of heat, and place in your exercise room.

 

b. Turn on your AC, and set the thermostat to 16-degrees C.

 

c. This will cause your AC's compressor to begin operating continuously, and at FULL Power.

 

d. IF your AC is functioning properly, and if the gas pressures are as stipulated by the manufacturer...then....

 

This will cause your AC to immediately begin condensing the water vapor in the exercise room.

 

e. If you want to check the output of your AC (how much water is being removed per hour), then just go outside and put a container under the drain pipe from the evaporator. 

You should place the container under the outlet of the drain pipe (hose) from the evaporator at the time that your AC is switched on.

And, you should measure the amount of water which drains from the hose for the FIRST full hour.

 

f. Next, after the first hour has elapsed and you have measured the amount of water which has condensed, then record the humidity, and turn off the heater.

f. Don't turn off the AC, yet...of course.

 

g.  Wait, and after the room temperature returns to about 20-degrees C, then record the humidity, once again.

 

g. Turn off AC....if you want...It's OK, now...

 

 

Yes, I am the RAMBLER, as you say.

The Stones even wrote a great song about me,...

When I met them, back in the day.

 

 

 

No space heater - it's Thailand.  Thanks for the other info.  I'm going to stick to my functionality test which is much easier.  If I can keep the treadmill room between 20-23c and humidity rarely crossing 60%, I'm a happy man.  I'll still be sweaty but with a fan also it will be comfortably warm. 

 

The amount of water extracted by the AC would be interesting.  I already built a funnel from where it come out to the Infront of my sliding glass doors  so I can verify the system is working.  It's is a quite amazing the amount that is running across the patio.   Once the flow stops, I know that in 10 minutes the room will become miserably hot and muggy. I like numbers so next hot day (won't have to wait long ) I'll do that and my bet is 2 liters an hour.  Cheers

[sometimewoodworker]

24 minutes ago, GammaGlobulin said:

 

Don't worry about the cold front, something that I am aware is now approaching, and here already, actually.

 

Anyway, in fact, you CAN test during the cold front.

 

All you need is a small space heater.

 

Before you begin this test, measure the humidity in the room.

 

a. Set the heater to about 1200 watts of heat, and place in your exercise room.

 

b. Turn on your AC, and set the thermostat to 16-degrees C.

 

c. This will cause your AC's compressor to begin operating continuously, and at FULL Power.

 

d. IF your AC is functioning properly, and if the gas pressures are as stipulated by the manufacturer...then....

 

This will cause your AC to immediately begin condensing the water vapor in the exercise room.

 

e. If you want to check the output of your AC (how much water is being removed per hour), then just go outside and put a container under the drain pipe from the evaporator. 

You should place the container under the outlet of the drain pipe (hose) from the evaporator at the time that your AC is switched on.

And, you should measure the amount of water which drains from the hose for the FIRST full hour.

 

f. Next, after the first hour has elapsed and you have measured the amount of water which has condensed, then record the humidity, and turn off the heater.

f. Don't turn off the AC, yet...of course.

 

g.  Wait, and after the room temperature returns to about 20-degrees C, then record the humidity, once again.

 

g. Turn off AC....if you want...It's OK, now...

 

 

Yes, I am the RAMBLER, as you say.

The Stones even wrote a great song about me,...

When I met them, back in the day.

 

 

 

Crucial and IMPORTANT Note to ensure success of this test:  IF you sweat as much as you say you do, which I very much DOUBT, then, please, for mercy's sake, DO NOT exercise on your treadmill during this test, which would compromise the validity of this test.  Just leave the room. And keep all doors and windows tightly shut.  Thank you!

 

 

You have postulated an invalid test. The RH of the room will rapidly drop to as low as the AC will allow, probably within 15 minutes, the volume of water collected will have to relation to the maximum it can extract as the room humidity will likely have dropped to 30% or under long before the test completion.

 

If you are going to design a test that can actually produce valid results then you must go back to the drawing board and get the factors correct.

It is certainly possible to achieve accurate information but not if you half a*r*s*e the test

[GammaGlobulin]

8 minutes ago, atpeace said:

No space heater - it's Thailand.  Thanks for the other info.  I'm going to stick to my functionality test which is much easier.  If I can keep the treadmill room between 20-23c and humidity rarely crossing 60%, I'm a happy man.  I'll still be sweaty but with a fan also it will be comfortably warm. 

 

The amount of water extracted by the AC would be interesting.  I already built a funnel from where it come out to the Infront of my sliding glass doors  so I can verify the system is working.  It's is a quite amazing the amount that is running across the patio.   Once the flow stops, I know that in 10 minutes the room will become miserably hot and muggy. I like numbers so next hot day (won't have to wait long ) I'll do that and my bet is 2 liters an hour.  Cheers

 

Of course, one more thing, and there is always "one more thing":

 

You should turn-on your AC about 30 minutes before you intend to use the treadmill.

 

Set the AC thermostat at the lowest setting (probably 16-degrees C) and highest fan speed.

This will lower the room temperature as much as possible.

 

Then, as you exercise, and as you say, the room temperature will rise. As the air temperature rises, the RH in the room will decrease, commensurately.

I am sure you already know the relationship between air temperature and RH, but for those who don't here is the relationship..

The inverse relationship between RH and temp is...

 

This is why it would be useful to cool the room down to lowest possible temp before exercising, and then let the temp rise which will dramatically lower the RH, even though it will not lower the absolute humidity....obviously.

 

[GammaGlobulin]

13 minutes ago, sometimewoodworker said:

the volume of water collected will have to relation to the maximum it can extract as the room humidity will likely have dropped to 30% or under long before the test completion.

 

No it won't.

There is much air leakage in any normal room.

The AC, will continue to extract water from the air, during the full hour of the test.

The purpose of the test is just to get some idea of approximately how much water is being extracted from the air over an hour period of time.

 

Also, more than an hour will be required to extract enough water to reach an RH of 30%, which is something IMPOSSIBLE with an AC, if the outside RH is about 80, or so.

 

And, before you are too hasty to reply, you have no evidence to show that what you have just stated is....TRUE.

In fact, it is false, IMHO.

 

How do I know?

Because...

I have the EVIDENCE....of course....!!!!

 

 

[atpeace]

3 minutes ago, GammaGlobulin said:

 

Of course, one more thing, and there is always "one more thing":

 

You should turn-on your AC about 30 minutes before you intend to use the treadmill.

 

Set the AC thermostat at the lowest setting (probably 16-degrees C) and highest fan speed.

This will lower the room temperature as much as possible.

 

Then, as you exercise, and as you say, the room temperature will rise. As the air temperature rises, the RH in the room will decrease, commensurately.

I am sure you already know the relationship between air temperature and RH, but for those who don't here is the relationship..

The inverse relationship between RH and temp is...

 

This is why it would be useful to cool the room down to lowest possible temp before exercising, and then let the temp rise which will dramatically lower the RH, even though it will not lower the absolute humidity....obviously.

 

All good but not interested 🙂 If the AC keeps the room at the desired temp, then I'm cool.  In this home over the the last 3 years I have had the treadmill in three different rooms with 3 different ACs.  All three have frozen over and two of them did it often during the hot season. Also happened in previous homes and never in my non exercise rooms.   I have enough data points for me but respect your opinion nonetheless.  Take care

[sometimewoodworker]

21 minutes ago, GammaGlobulin said:

 

No it won't.

There is much air leakage in any normal room.

The AC, will continue to extract water from the air, during the full hour of the test.

The purpose of the test is just to get some idea of approximately how much water is being extracted from the air over an hour period of time.

 

Also, more than an hour will be required to extract enough water to reach an RH of 30%, which is something IMPOSSIBLE with an AC, if the outside RH is about 80, or so.

 

And, before you are too hasty to reply, you have no evidence to show that what you have just stated is....TRUE.

In fact, it is false, IMHO.

 

How do I know?

Because...

I have the EVIDENCE....of course....!!!!

 

 

Your test is totally flawed and based on erroneous assumptions.

 

Yes rooms have air leaks. No the humidity doesn’t rise at any significant rate. Yes I have data to support those points. Your assumption that an AC can’t achieve 30% humidity with an outside humidity is laughable wrong. That I wouldn’t want that low a humidity is irrelevant. 
 

A datum point apropos of nothing in particular is that our house has a humidity level that is virtually always at least 10% lower than the outside even when there has been no AC running for hours.

[GammaGlobulin]

16 minutes ago, sometimewoodworker said:

Your assumption that an AC can’t achieve 30% humidity with an outside humidity is laughable wrong.

 

Go ahead and laugh, then, if you will.

But, you are still wrong, and I, Sir, am RIGHT!

 

 

 

 

The above are the results for a 24,000BTU AC running for 15 minutes at HIGHEST Fan setting, and LOWEST Thermostat setting (16-degrees C).

 

The bedroom room size is approximately 5 meters x 4 meters.

 

No air leakage through windows which have been boarded up and sealed.

(Of course, there is still leakage of air, to some degree, and this is why it is impossible to achieve 30% RH in-room, with an outdoor RH of 64%.  It would be IMPOSSIBLE to reduce the in-room RH to 30%, given these conditions. The outdoor RH is just too high....  After all, my bedroom is neither a closed system, nor an isolated system.  Did you think that I thought it might be?????  How, ODD.)

 

Note:  Of course, I always use TWO XiaoMi Air Purifiers, running 24/7.  Both purifiers are in the same bedroom.  And, the readings on both machines are consistent with each other.

 

 

This is the machine being used.

 

[GammaGlobulin]

24 minutes ago, sometimewoodworker said:

A datum point apropos of nothing in particular is that our house has a humidity level that is virtually always at least 10% lower than the outside even when there has been no AC running for hours.

 

One reason for this RH difference, in all likelihood, is the temperature difference between inside and outside, if you keep your windows open.

If windows are closed, then this difference might be due to the cold morning air in the house, gradually warming throughout the day, as the house heats up, And if the windows are shut, then the RH will decrease as the air inside the house increases in temperature.