Adiabitic Cooling Maintenance

Marc O'Brien · Joined: 23 Jan 2008 Posts: 91

For adiabatic fresh air cooling systems, not so common in the UK but
probably more common in the drier US climates, anybody know what are
the suggested methods of water treatment and descaling?

Archived from group: alt>hvac

Zyp · Joined: 22 Aug 2007 Posts: 275

Marc O'Brien wrote:
> For adiabatic fresh air cooling systems, not so common in the UK but
> probably more common in the drier US climates, anybody know what are
> the suggested methods of water treatment and descaling?

The word [Adiabatic] means a phase change without adding heat or losing
heat. What is an "adiabatic cooling system" that doesn't add or move heat?
I've never heard of such an animal. Educate me Marc O'Brien.

--
Zyp

Marc O'Brien · Joined: 23 Jan 2008 Posts: 91

On Feb 18, 6:15 pm, "Zyp" wrote:
> Marc O'Brien wrote:
> > For adiabatic fresh air cooling systems, not so common in the UK but
> > probably more common in the drier US climates, anybody know what are
> > the suggested methods of water treatment and descaling?
>
> The word [Adiabatic] means a phase change without adding heat or losing
> heat. What is an "adiabatic cooling system" that doesn't add or move heat?
> I've never heard of such an animal. Educate me Marc O'Brien.
>
> --
> Zyp

You pass warm dry air over an apparatus that provides a high contact
surface area of water, often atomised water sprayed under pressure.
The heat from the air evaporates some of the water. The effect is
cooler air but with a higher dew point to the effect that there has
been no change in wet bulb and hense no change in the air volumes
enthalpy. No heat loss, only a temperature loss.

Joseph · Joined: 07 Aug 2007 Posts: 62

"Marc O'Brien" wrote in message @d4g2000prg.googlegroups.com...
On Feb 18, 6:15 pm, "Zyp" wrote:
> Marc O'Brien wrote:
> > For adiabatic fresh air cooling systems, not so common
> > in the UK but
> > probably more common in the drier US climates, anybody
> > know what are
> > the suggested methods of water treatment and descaling?
>
> The word [Adiabatic] means a phase change without adding
> heat or losing
> heat. What is an "adiabatic cooling system" that doesn't
> add or move heat?
> I've never heard of such an animal. Educate me Marc
> O'Brien.
>
> --
> Zyp

You pass warm dry air over an apparatus that provides a high
contact
surface area of water, often atomised water sprayed under
pressure.
The heat from the air evaporates some of the water. The
effect is
cooler air but with a higher dew point to the effect that
there has
been no change in wet bulb and hense no change in the air
volumes
enthalpy. No heat loss, only a temperature loss.

=> I have experience with the Reznor line. They are the
only ones I have seen with the desiccant type evap pads.

My news server isn't getting all the posts, I've been
missing some and some of my posts haven't appeared yet Sad

This is the style of units I see...

http://www.rezspec.com/cms_download.php?mod_files[fileid]=000000001040

Reznor has a nice ref. manual worth a glance...

http://www.rezspec.com/cms_download.php?mod_files[fileid]=000000001492

As far as maintenance goes, All I've gotten from the
users manual is to frequently drain the system and to clean
the pads annually. The expected life span is only three
years for the Reznor pads.

Joseph

--
"Endeavor to Persevere", Outlaw Josey Wales.

Zyp · Joined: 22 Aug 2007 Posts: 275

Joseph wrote:
> "Marc O'Brien" wrote in message
> @d4g2000prg.googlegroups.com...
> On Feb 18, 6:15 pm, "Zyp" wrote:
>> Marc O'Brien wrote:
>>> For adiabatic fresh air cooling systems, not so common
>>> in the UK but
>>> probably more common in the drier US climates, anybody
>>> know what are
>>> the suggested methods of water treatment and descaling?
>>
>> The word [Adiabatic] means a phase change without adding
>> heat or losing
>> heat. What is an "adiabatic cooling system" that doesn't
>> add or move heat?
>> I've never heard of such an animal. Educate me Marc
>> O'Brien.
>>
>> --
>> Zyp
>
> You pass warm dry air over an apparatus that provides a high
> contact
> surface area of water, often atomised water sprayed under
> pressure.
> The heat from the air evaporates some of the water. The
> effect is
> cooler air but with a higher dew point to the effect that
> there has
> been no change in wet bulb and hense no change in the air
> volumes
> enthalpy. No heat loss, only a temperature loss.
>
>
> => I have experience with the Reznor line. They are the
> only ones I have seen with the desiccant type evap pads.
>
> My news server isn't getting all the posts, I've been
> missing some and some of my posts haven't appeared yet Sad

>
> This is the style of units I see...
>
> http://www.rezspec.com/cms_download.php?mod_files[fileid]=000000001040
>
> Reznor has a nice ref. manual worth a glance...
>
> http://www.rezspec.com/cms_download.php?mod_files[fileid]=000000001492
>
> As far as maintenance goes, All I've gotten from the
> users manual is to frequently drain the system and to clean
> the pads annually. The expected life span is only three
> years for the Reznor pads.
>
> Joseph
>
> --
> "Endeavor to Persevere", Outlaw Josey Wales.

Well there ya go. I could'a had a V-8 LOL

--
Zyp

Mark · Joined: 07 Aug 2007 Posts: 26

On Feb 17, 2:35 pm, "Marc O'Brien" wrote:
> For adiabatic fresh air cooling systems, not so common in the UK but
> probably more common in the drier US climates, anybody know what are
> the suggested methods of water treatment and descaling?

what I found effective is to have a small percentage of bleed water.
If ALL the source water is evaporated, then ALL the minerals are left
behind and build up in concentration until you clean it out. If you
bleed off a percentage of the circulating water and dispose of it,
then the mineral level will establish an equalibrium and be flushed
out via the bleed water. It still needs to be cleaned out but not as
often.

Mark

Stormin Mormon · Joined: 07 Aug 2007 Posts: 284

Also much less risk of airbourne illness, such as Legionaire's disease.

--
Christopher A. Young
Learn more about Jesus
www.lds.org
..

"Mark" wrote in message @72g2000hsu.googlegroups.com...

what I found effective is to have a small percentage of bleed water.
If ALL the source water is evaporated, then ALL the minerals are left
behind and build up in concentration until you clean it out. If you
bleed off a percentage of the circulating water and dispose of it,
then the mineral level will establish an equalibrium and be flushed
out via the bleed water. It still needs to be cleaned out but not as
often.

Mark

kool · Joined: 07 Aug 2007 Posts: 56

"Stormin Mormon" wrote in message $0$22810$4c368faf@roadrunner.com...
> Also much less risk of airbourne illness, such as Legionaire's disease.
>
> --
> Christopher A. Young
> Learn more about Jesus
> www.lds.org
> .
>
>
> "Mark" wrote in message
> @72g2000hsu.googlegroups.com...
>
> what I found effective is to have a small percentage of bleed water.
> If ALL the source water is evaporated, then ALL the minerals are left
> behind and build up in concentration until you clean it out. If you
> bleed off a percentage of the circulating water and dispose of it,
> then the mineral level will establish an equalibrium and be flushed
> out via the bleed water. It still needs to be cleaned out but not as
> often.
>
> Mark

I don't think I would rely on bleedoff as a control against Legionella
bacteria. You need a good quality biocide (bugstick) to kill those little
buggers! In a swamp cooler application the Biocide is probably as dangerous
to people as the bacteria is. A monthly shock treatment with chlorine is
probably the safest thing to do. A SMALL bleedoff amount is probably a help
to control scale buildup, anything more is a huge waste of water 24/7.