[Dsg-rich] Fwd: RICH humidity graph

[Amrit Yegneswaran]

george, 
thanks for the info regarding the desiccant. 
i appreciate that very much. 

i think we are doing really good on the humidity. 
i hope marco and marco concur. 

next wed at the meeting, we can have a pow-wow about if it is possible to make improvements 
wish you a pleasant evening. 
amrit 


From: "George Jacobs" <jacobsg at jlab.org> 
To: "Amrit Yegneswaran" <yeg at jlab.org> 
Cc: "dsg-rich" <dsg-rich at jlab.org>, "Marco Mirazita" <Marco.Mirazita at lnf.infn.it> 
Sent: Thursday, May 10, 2018 4:28:44 PM 
Subject: Re: [Dsg-rich] Fwd: RICH humidity graph 

I guess "dry air" is a relative term. It looks as though the cooling air only increases n2 volume RH by ~1%. So, in relation to the air we breath, it's very dry air. In relation to the n2 supply, it's not. 

Desiccants absorb H20 according to it's surface area and the time in contact. To absorb H2O from two compressors supplying 1200 lpm air flow each (90 cfm), a large surface area and sufficient contact time is required. Typically, fairly large desiccant towers are used for this. Dual towers with a regeneration cycle can offer continuous operation. This unit would be too large to place on the top deck of the fwd carriage. See a nice one in the below pic. The biggest drawback besides cost is that a 3rd air compressor would be required to purge the H2O out of the offline towe r. 


The Full Product Brochure 
https://www.ingersollrandproducts.com/content/dam/ir-products/en/100page/CAT/Desiccant%20Dryers%20Bochure.pdf 


On 5/10/2018 3:06 PM, Amrit Yegneswaran wrote: 



george, 
the question is (as marco pointed out) once the air compressor is off the humidity goes down. yeep its going down because N2 is dry, which to me implies that the humidity is in the air that is being pumped to the RICH (see brian's email). 
the inline desiccant query was for the air line and for use during the run. 
my guess is the air compressor is not really outputting dry air. 
anyway lets muse over it. 

brian, what needs to be done to fully instrument the air tank sensor so that the PV doesn't read 0 ppm? 
amrit 


From: "George Jacobs" <jacobsg at jlab.org> 
To: "Amrit Yegneswaran" <yeg at jlab.org> , "dsg-rich" <dsg-rich at jlab.org> , "Marco Mirazita" <Marco.Mirazita at lnf.infn.it> 
Sent: Thursday, May 10, 2018 1:39:59 PM 
Subject: Re: [Dsg-rich] Fwd: RICH humidity graph 

Please remind me of the sensor specs. isn't it only good down to 3% RH? 

If this is the RICH nitrogen volume, why are we referring to it as dry air? The nitrogen supply is dry, < 3 ppm. But, the rate of H2O contamination from atmosphere is directly proportional to ambient H2O levels. The N2 flow is currently maxed out with the old N2 panel. The only way to increase N2 flow is to install the NEW panel. 

Since the air is currently off, adding a desiccant will do nothing? 

Perhaps both top and bottom garage doors are open in the hall? Check hall humidity. The higher the humidity gets in the hall, the higher it will go in the RICH. There should be a rule, only 1 door open at a time like we tried to have for clas6. With both doors open, hall humidity can reach to outside/exterior levels. This has been an issue many times in the past with clas6. 

Cheers, 
George 

On 5/10/2018 12:32 PM, Amrit Yegneswaran wrote: 

BQ_BEGIN

hi marco, 
i couldn't see the graphs in your email/log, so pete sent me the graphs. 
so, it appears the dry air isn't dry ! 

brian/george, 
could one add an inline desiccant 
amrit 

From: "Peter Bonneau" <bonneau at jlab.org> 
To: "Amrit Yegneswaran" <yeg at jlab.org> 
Sent: Thursday, May 10 , 2018 9:25:48 AM 
Subject: RICH humidity graph 

Hi Amrit, 

Here is the RICH humidity graph: 




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-- 
George Jacobs
Jefferson Lab (TJNAF)
STE 12
12000 Jefferson Ave.
Newport News, VA 23606

(office) 757-269-7115 (cell) 757-876-0480 (email) jacobsg at jlab.org (website) https://userweb.jlab.org/~jacobsg 


BQ_END

-- 
George Jacobs
Jefferson Lab (TJNAF)
STE 12
12000 Jefferson Ave.
Newport News, VA 23606

(office) 757-269-7115

(cell)   757-876-0480

(email) jacobsg at jlab.org (website) https://userweb.jlab.org/~jacobsg 

G 
M 
T 
		
		
	
	
	
	
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