OT – Dehumifier and Air Conditioner

[RichardJamesEsquire]

Yes dew point is the maximum, when the air is saturated and moisture starts falling out of it. Psychrometrics is the science. Enthalpy is the total heat content of the air. When someone says “but it’s a dry heat” it’s absolutely true. More humid air has more heat content than less humid air of the same dry bulb temperature. Your air conditioner is removing about 80% sensible heat and 20% latent heat (moisture removal).It’s bringing the dry bulb temperature down quickly, the enthalpy is going down, but it’s not removing enough moisture (latent heat). The warmer the air, the more moisture it can hold. Relative humidity (how much moisture the air can hold at a given temperature by percentage) may actually be going up as the temperature is going down. This is why I say your unit doesn’t fit the application. You need one that will remove more latent heat. This is done by moving less air across the coil while at the same time reducing the capacity of the unit. It lowers the dry bulb temperature slower giving more time to remove latent heat. From what I’ve read (cause I have no practical experience having only worked in dry climates), pretty much everyone living in humidity who goes to a variable speed 2 stage unit will never go back.

[disimilar1]

I would never live again without my dehumidifier. I cannot comment about the science between an a/c and a dehumidifier. My lungs seem to know the difference though.

[disimilar1]

I would never live again without my dehumidifier. I cannot comment about the science between an a/c and a dehumidifier. My lungs seem to know the difference though.

[disimilar1]

I would never live again without my dehumidifier. I cannot comment about the science between an a/c and a dehumidifier. My lungs seem to know the difference though.

[disimilar1]

I would never live again without my dehumidifier. I cannot comment about the science between an a/c and a dehumidifier. My lungs seem to know the difference though.

[disimilar1]

I would never live again without my dehumidifier. I cannot comment about the science between an a/c and a dehumidifier. My lungs seem to know the difference though.

[LuckyInOC]

RJE has it right…

AC units in humid climates need thicker coils to remove the latent (moisture) from the air. Restaurants, auditoriums, churches and such with high occupancies have similar problem even here in dry So. Cal.

Here is a simple psychrometric chart to understand dry bulb, wet bulb, and relative humidity.
http://en.wikipedia.org/wiki/File:PsychrometricChart-SeaLevel-SI.jpg

You should check with an AC professional to see if it is possible to put a dehumidifier in the return air for your AC. This could reduce the latent load on your existing AC unit with less expense.

The best solution would be verify the capacity of your existing AC unit (condenser [outside] and evaporator [inside]) meets both the temperature and humidity requirements you want. Most designs are only for nominal environmental peaks, not extremes.

Secondary systems are sometimes a cost effective way to handle extremes without impacting the performance on nominal peak usage.

I’m very…
Lucky In OC

[LuckyInOC]

RJE has it right…

AC units in humid climates need thicker coils to remove the latent (moisture) from the air. Restaurants, auditoriums, churches and such with high occupancies have similar problem even here in dry So. Cal.

Here is a simple psychrometric chart to understand dry bulb, wet bulb, and relative humidity.
http://en.wikipedia.org/wiki/File:PsychrometricChart-SeaLevel-SI.jpg

You should check with an AC professional to see if it is possible to put a dehumidifier in the return air for your AC. This could reduce the latent load on your existing AC unit with less expense.

The best solution would be verify the capacity of your existing AC unit (condenser [outside] and evaporator [inside]) meets both the temperature and humidity requirements you want. Most designs are only for nominal environmental peaks, not extremes.

Secondary systems are sometimes a cost effective way to handle extremes without impacting the performance on nominal peak usage.

I’m very…
Lucky In OC

[LuckyInOC]

RJE has it right…

AC units in humid climates need thicker coils to remove the latent (moisture) from the air. Restaurants, auditoriums, churches and such with high occupancies have similar problem even here in dry So. Cal.

Here is a simple psychrometric chart to understand dry bulb, wet bulb, and relative humidity.
http://en.wikipedia.org/wiki/File:PsychrometricChart-SeaLevel-SI.jpg

You should check with an AC professional to see if it is possible to put a dehumidifier in the return air for your AC. This could reduce the latent load on your existing AC unit with less expense.

The best solution would be verify the capacity of your existing AC unit (condenser [outside] and evaporator [inside]) meets both the temperature and humidity requirements you want. Most designs are only for nominal environmental peaks, not extremes.

Secondary systems are sometimes a cost effective way to handle extremes without impacting the performance on nominal peak usage.

I’m very…
Lucky In OC

[LuckyInOC]

RJE has it right…

AC units in humid climates need thicker coils to remove the latent (moisture) from the air. Restaurants, auditoriums, churches and such with high occupancies have similar problem even here in dry So. Cal.

Here is a simple psychrometric chart to understand dry bulb, wet bulb, and relative humidity.
http://en.wikipedia.org/wiki/File:PsychrometricChart-SeaLevel-SI.jpg

You should check with an AC professional to see if it is possible to put a dehumidifier in the return air for your AC. This could reduce the latent load on your existing AC unit with less expense.

The best solution would be verify the capacity of your existing AC unit (condenser [outside] and evaporator [inside]) meets both the temperature and humidity requirements you want. Most designs are only for nominal environmental peaks, not extremes.

Secondary systems are sometimes a cost effective way to handle extremes without impacting the performance on nominal peak usage.

I’m very…
Lucky In OC

[LuckyInOC]

RJE has it right…

AC units in humid climates need thicker coils to remove the latent (moisture) from the air. Restaurants, auditoriums, churches and such with high occupancies have similar problem even here in dry So. Cal.

Here is a simple psychrometric chart to understand dry bulb, wet bulb, and relative humidity.
http://en.wikipedia.org/wiki/File:PsychrometricChart-SeaLevel-SI.jpg

You should check with an AC professional to see if it is possible to put a dehumidifier in the return air for your AC. This could reduce the latent load on your existing AC unit with less expense.

The best solution would be verify the capacity of your existing AC unit (condenser [outside] and evaporator [inside]) meets both the temperature and humidity requirements you want. Most designs are only for nominal environmental peaks, not extremes.

Secondary systems are sometimes a cost effective way to handle extremes without impacting the performance on nominal peak usage.

I’m very…
Lucky In OC

[briansd1]

Thanks for the response, lucky in OC.

I did some more reading:
http://en.wikipedia.org/wiki/Thermal_comfort

I got the plumber to come out and setup a drain for me on the main floor where the living room is.

I will set the dehumidifier to automatically run to remove the humidity when I’m not home.

Then I’ll use the AC when home. I’m leaving the AC on at 78 when not home. That’s what my friend in Florida does.

[briansd1]

Thanks for the response, lucky in OC.

I did some more reading:
http://en.wikipedia.org/wiki/Thermal_comfort

I got the plumber to come out and setup a drain for me on the main floor where the living room is.

I will set the dehumidifier to automatically run to remove the humidity when I’m not home.

Then I’ll use the AC when home. I’m leaving the AC on at 78 when not home. That’s what my friend in Florida does.

[briansd1]

Thanks for the response, lucky in OC.

I did some more reading:
http://en.wikipedia.org/wiki/Thermal_comfort

I got the plumber to come out and setup a drain for me on the main floor where the living room is.

I will set the dehumidifier to automatically run to remove the humidity when I’m not home.

Then I’ll use the AC when home. I’m leaving the AC on at 78 when not home. That’s what my friend in Florida does.

[briansd1]

Thanks for the response, lucky in OC.

I did some more reading:
http://en.wikipedia.org/wiki/Thermal_comfort

I got the plumber to come out and setup a drain for me on the main floor where the living room is.

I will set the dehumidifier to automatically run to remove the humidity when I’m not home.

Then I’ll use the AC when home. I’m leaving the AC on at 78 when not home. That’s what my friend in Florida does.

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