[PSUBS-MAILIST] Scrubber design and materials

[via Personal_Submersibles]

Alan, 

 

Axial scrubber, radial fan..

 

Emile

 

Van: Personal_Submersibles <personal_submersibles-bounces at psubs.org> Namens Alan James via Personal_Submersibles
Verzonden: maandag 28 december 2020 19:41
Aan: Cliff Redus via Personal_Submersibles <personal_submersibles at psubs.org>
Onderwerp: Re: [PSUBS-MAILIST] Scrubber design and materials

 

Following this discussion with interest. 

Emile I thought had an axial type scrubber

that held something like 10lb of absorbent. 

This would require a lot more power to move the air through maybe 1ft of absorbent, whereas David has a radial scrubber that only needs to push air through a 2" section of absorbent. Some good thoughts on power consumption under load Cliff. I wonder if the load increases as the absorbent is spent & becomes more soggy. Ie. is there more of a load toward the end of the dive than at the beginning. 

I am wanting to go with 2 smaller axial scrubbers, mainly to keep the size down. Am thinking of using an oversized axial fan to keep the noise down, and have automated speed control based on the CO2 level. 

Alan

 

On Tuesday, December 29, 2020, 04:39:29 AM GMT+13, Cliff Redus via Personal_Submersibles <personal_submersibles at psubs.org <mailto:personal_submersibles at psubs.org> > wrote: 

 

 

The squire gage blower I use on the R300 scrubber is similar the one Emile has posted.  DC FLATPAKS.qxp (octopart.com) <https://datasheet.octopart.com/RL90-18-24-EBM-Papst-datasheet-68360.pdf> 

 

Model Papst RL90-18/14N

Voltage 12-28VDC

Power 5W

Noise 58dBA

Current  .21A

Air flow  24CFB  at 0 in H20 differential pressure

 

Note that the flow rate through these fans/blowers are given at 0 differential pressure.  You would need to look at the head curve on the datasheet to determine the actual flowrate through the fan/scrubber.  It would be substantially reduced due to the pressure drop through the CO2 absorbent section.   Also to meet ABS rules, you need to size this unit so the that the current draw is not so great as to pull the emergency battery down before reaching 72 hours of life support.  On my boat, the hotel load is about 1.5 amps (life support and comms only).  The emergency battery has a capacity of 110 Ah at 24V so a 1.5A hotel load will last 73 hours.  I did a garage test to confirm.

 

Cliff

 

 

 

 

 

 

On Sunday, December 27, 2020, 11:39:56 PM CST, David Colombo via Personal_Submersibles <personal_submersibles at psubs.org <mailto:personal_submersibles at psubs.org> > wrote: 

 

 

Hi Brian, here is the data on the fan. I havent ran any tests yet to see if the watts rating are at full speed. I am adding a dimmer circuit as well.

*	Rated Voltage: 12V
*	Rated Current: 1.0A
*	Connecter: XH2.54-2Pin
*	Power: 11W
*	Speed: 3000RPM
*	Air flow:38.5CFM
*	Noise:45dBA

David

On Sun, Dec 27, 2020, 6:24 PM Brian Cox via Personal_Submersibles <personal_submersibles at psubs.org <mailto:personal_submersibles at psubs.org> > wrote:

David,          How many watts is the scrubber motor?

 

Brian

 



--- personal_submersibles at psubs.org <mailto:personal_submersibles at psubs.org>  wrote:

From: David Colombo via Personal_Submersibles <personal_submersibles at psubs.org <mailto:personal_submersibles at psubs.org> >
To: Personal Submersibles General Discussion <personal_submersibles at psubs.org <mailto:personal_submersibles at psubs.org> >
Subject: [PSUBS-MAILIST] Scrubber design and materials
Date: Sun, 27 Dec 2020 16:17:51 -0800

Hi Guys, just completed my scrubber for the VAST sub. Its capacity is right at 3lbs, based on my rice test. I see I can purchase soda sorb online but was wanting recommendations on where to purchase it or the draeger product. Since this is my first scrubber, I have no experience with the different products. 

David

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