Results 1 to 20 of 20
Thread: liquid desiccant dehumidify
-
21-02-2005, 03:57 AM #1
liquid desiccant dehumidify
who have used liquid desiccant dehumidifier ?
-
21-02-2005, 07:28 AM #2
Re: liquid desiccant dehumidify
First time I hear of this?
Can you explain perhaps a little more Lc?It's better to keep your mouth shut and give the impression that you're stupid than to open it and remove all doubt.
-
21-02-2005, 11:49 AM #3
Re: liquid desiccant dehumidify
Liquid dessicant is a new one on me, too.
Normal dessicant dehumidifiers are basically a miniature heat wheel heat exchanger impregnated with a silica gel or similar dessicant agent.
The wheel turns slowly in a dual chamber. Cool moist air is introduced to one side - a heater re-generates the wet dessicant on the other side - the hot moist air is rejected.
Even quite small ones are capable of rapid moisture removal.
In my experience the portable ones are used for moisture removal in buildings, after floods etc. Bigger ones are used in process control, but that's a bit specialised.
________
Plymouth Voyager specificationsLast edited by Argus; 07-02-2011 at 08:14 AM.
-
21-02-2005, 03:13 PM #4
Re: liquid desiccant dehumidify
Hi guys.
Liquid dessicant is used for drying large green houses.
There is a company in Israel that specialised in it.
It is also used for hot Spa's for drying and cooling.
The stuff they use is bad for your skin and attacks metal very quick, no matter if it is galvanised or epoxy painted.
Chemi
-
21-02-2005, 03:35 PM #5
Re: liquid desiccant dehumidify
Sounds like Lithium Bromide.......
________
lololLast edited by Argus; 07-02-2011 at 08:15 AM.
-
21-02-2005, 05:53 PM #6
Re: liquid desiccant dehumidify
Yas Argus, thats the stuff.
Horrible, isn't it?
Chemi
-
21-02-2005, 09:08 PM #7
Re: liquid desiccant dehumidify
Never used outside big Abos myself, the stuff would shrink your boots.
What do they do with it? wash the tomatoes?
________
RD500LCLast edited by Argus; 07-02-2011 at 08:15 AM.
-
22-02-2005, 01:03 AM #8
Re: liquid desiccant dehumidify
It's used for supplying dry air for DOAS. It's said it can incorporate with low-level heat resource.
for your ref
http://www.nrel.gov/desiccantcool/intro.html
-
22-02-2005, 04:17 PM #9
Re: liquid desiccant dehumidify
Originally Posted by lc_shi
________
Toyota A transmission historyLast edited by Argus; 07-02-2011 at 08:15 AM.
-
22-02-2005, 07:11 PM #10
Re: liquid desiccant dehumidify
Dedicated Outdoor Air Systems
Chemi
-
22-02-2005, 10:21 PM #11
Re: liquid desiccant dehumidify
Originally Posted by lc_shi
If you plan to use it for large greenhouses or anywhere where the average temperature is mostly above 7C I would advise you to switch to fridge dryers cause under these circumstances theze would have a mutch better water extraction and lower power consumtion.
There is also a possibility to remove heat and or reclame heat.
Regards Victor
-
23-02-2005, 12:39 AM #12
Re: liquid desiccant dehumidify
Chemi
Any more information about your said Isreal manufacture?
-
03-11-2007, 10:31 AM #13
Re: liquid desiccant dehumidify
easily desiccant is used to treat the latent part, rather than sub-cooling or other methods used in TVCACS, which followed mostly by reheating. i.e. inefficient thermodynamically.
-
03-11-2007, 10:59 AM #14
Re: liquid desiccant dehumidify
Correct me if I'm wrong but if you have to remove a certain amount of water, you need energy to do this.
If you use a desiccant dryer or a cooling coil with reheat (reheating with a condensor is better of course), the total energy to do this will be +/- the same, apart for the efficiency of course of the used drying system.It's better to keep your mouth shut and give the impression that you're stupid than to open it and remove all doubt.
-
05-11-2007, 06:05 AM #15
Re: liquid desiccant dehumidify
The total energy remains same in any process. The advantage with desiccant dehumidifiers is that, the secondary refrigerant (water/brine) temperature need not be as low as if you are using cooling/heating method. So, you can run your refrigeration system for a bit higher temperature. However, whether we can save energy or not is highly doubtful as the desiccant is to be regenerated using electricity (generally) which is a high grade energy.
I have used LiCl based liquid desiccant dryers and then replaced them later along with the duct work.
-
05-11-2007, 08:44 AM #16
Re: liquid desiccant dehumidify
Hi Lc,
I think the type of dehumidifier you are refering to is perhaps manufactured by 'Munters'. You can google Munters for more info.
It incorporates Lithium Chloride as a liquid desiccant. It is felt by some engineers that flakes of dry desiccant (like silica gel) can get entrained into air stream where it would be easier to contain leakage of a liquid desiccant.
S M GokhaleLast edited by S.M.Gokhale; 05-11-2007 at 08:46 AM.
-
05-11-2007, 10:34 AM #17
Re: liquid desiccant dehumidify
Ease of containing liquid desiccant over solid desiccant is an understatement. The only advantage of liquid desiccant dehumidifier is that we need not have a cooling coil after the dehumidifier. Sensible cooling can be acheived by varying desiccant flowrate (the process is not necessarily isenthalpic and the process line can have any slope on the psychrometric chart).
Munters are mainly into desiccant dehumidifiers. Kathabar and Drykor are liquid desiccant dehumidifier manufacturers and I used both of their equipment.
-
06-11-2007, 03:27 PM #18
Re: liquid desiccant dehumidify
Holy necrothread batman!
-
06-11-2007, 07:34 PM #19
Re: liquid desiccant dehumidify
actually u r correct, but the point is the average reactivation energy of the desiccant is low, especially for Liquid desiccants, i.e. low grade energy source ( solar, co-generation plants, hybrid with conventional Vapor Compression systems........) will be enough, add to that, by using solar energy and using direct and or indirect evaporative cooling to handle the sensible load part, it will be totally environmentally friendly, minimizing the electricity needed ( just small part to run the pumps and fans) no CFC's.............
it will be a revolution in cooling and air conditioning
just a matter of time
-
12-12-2007, 11:11 AM #20
Re: liquid desiccant dehumidify
hey all;
i have one, but now i am trying to find such a wick material with good characteristics, instead of cotton, may anyone support me.
cheers
Similar Threads
-
Suction gas <-> liquid line heat exchange and performance gains
By DaBit in forum Technical SpeculationsReplies: 30Last Post: 18-05-2010, 01:52 PM -
Liquid line for multi evaporators
By Kevin Yeo in forum Supermarket RefrigerationReplies: 1Last Post: 29-12-2005, 02:29 PM -
Parker levels in ammonia systems
By Friobernal in forum IndustrialReplies: 3Last Post: 04-08-2005, 03:46 PM -
Dehumidification with a liquid desiccant.
By Gelante in forum New TechnologiesReplies: 6Last Post: 16-09-2004, 10:22 PM