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Messages - rb30022

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General Homebrew Discussion / Using Starsan in Copper Counterflow Chiller
« on: December 27, 2016, 03:36:43 PM »
I use Star San as my sanitizer of choice.  I recently purchased a copper counterflow wort chiller and added it to my system.  After using it for the first time, I flushed it with hot water and then ran Star San through it.  I decided to leave it full of Star San to prevent anything from growing inside between brews.  A few weeks later, I was reading an article on cleaning and sanitizing and was reminded that Star San is an acid and that it reacts with copper.  I removed the hose from the bottom of my chiller and allowed it to drain and, sure enough, it has a green coating on the inside.  I have a couple of questions regarding what damage I may have done.

1.  Is the green stuff inside my chiller harmful to humans and, if so, how should I go about removing it?

2.  Have I done any permanent damage to my chiller such as pitting that might allow bacterial places to hide?

Thanks for any help or suggestions.

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Equipment and Software / Re: Fermentation Immersion Chiller
« on: September 27, 2012, 09:47:28 AM »
Thank you everyone for the great feedback!  This should get me started.

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Equipment and Software / Fermentation Immersion Chiller
« on: September 25, 2012, 01:31:04 AM »
Does anyone have experience with an immersion chiller for fermentation.  I ferment in a 25 gallon conical and would like to be able to control fermentation temperature.  I thought about building a cabinet of some sort but I barely have enough time to brew and am reluctant to take on a project that large.  I also thought about an upright freezer with a controller but it is hard to find one larger enough for my fermenter.  Then it occurred to me that an immersion chiller might be an option.  I've seen a couple of references to such a device but have lots of questions.

Should I use stainless or copper tubing?
What length of tubing do I need and what diameter?
Would a flat spiral design be better or should I go with a traditional cylindrical coil?  Must be able to clean and sanitize.
Would an ice bath in a cooler be sufficient or should I place the "hot" coil in a chest freezer or refrigerator?

If anyone could offer any advice, I would really appreciate it.

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Sorry.  I'm new to this forum stuff so I don't know how to quote who I'm responding to but 249 BTU/hr is the same number I got.  I just thought I might me plugging in a number in with the wrong units somewhere.  I bumped it up to 400 to account for leakage and so the unit wouldn't have to run all the time.  Since we're all coming up with the same number, what I need to know now is what kind of refrigeration unit I need to provide that rate of cooling.  I've looked at a unit designed for boats manufactured by Mermaid, the MM2 remote refrigeration unit with their 425M evaporator, but I didn't see a BTU rating on their web page.  I've also looked at a 1/4 HP Embraco condensing unit which is rated at 3650 BTU http://www.globalindustrial.com/p/hvac/compressors-line-filter-dryers/compressors/embraco-condensing-unit but that seems like way more than I need.  I also found a Dayton unit (CU102 Commercial Temperature Air Condensing Unit) http://www.daytonrefrigeration.com/servlet/the-163/dayton-refrigeration%2C-refrigeration-parts%2C/Detail but again the BTU rating seems way more than I need.  What I'm not sure of is how the rated capacity applies at the temperature differential that I am looking for, especially after discovering how much the TEC units drop off with temperature differential.  I'm hoping someone with some refrigeration experience and/or knowledge can give me some guidance on how large a unit I need to pump 400 BTU per hour at a 40 deg F differential.  I would prefer a TEC unit because of he simplicity of installation but the efficiency issue may make that unfiesable.  Any guidance would be greatly appreciated.

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I looked online and found that the R value for the foam ranges between 4 and 8 per inch of insulation so I used a value of 4.

I know that 35 is colder than I really want to keep my beer but I want some factor of safety so the unit wont have to run all the time.  The cabinet is actually devided into two compartments and I want to be able to keep my lagers and lighter ales at about 40 deg in one compartment and my heavier ales at about 50 deg in the other.  I plan to use thermostaticaly controlled fans to draw cold air from the colder compartment to the warmer.  I just want to make sure that, if anything, I have more refrigeration than I need rather than less.

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Yes, I read the article in Zymurgy as well and went back and read the article on the Gettochill 5000 in last year's gadgets issue but I didn't see any info on how to choose a unit of the correct size.  I did a little research on thermoelectric units and it looks like they become less and less efficient the larger the temperature differential you are trying to achieve.  If I was interpreting the information correctly, I looked like I would need a 1500 BTU unit to pump 400 BTU/Hr at a 40 deg F differential.

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I have constructed a keg cabinet as part of my bar in my basement and am trying to figure out how much refrigeration I need to keep my kegs cool. The cabinet measures 27" H x 40" W x 24" D and has 1.5" of pink Styrofoam insulation board on all sides. I read Chris Bible's article in this month's BYO and calculated that I need about 400 BTU/Hr to keep the interior at about 35 deg F with an exterior temperature of about 75 deg F but this seems like a low number. Can anyone tell me if this value is in the right ball park? Also, I am trying to decide whether to use conventional refrigeration or thermoelectric. For conventional, I am looking at a remote condenser unit off to the side with an evaporator inside the cabinet. A thermoelectric unit could be mounted directly to the side of the cabinet. Any thoughts on pros and cons of each type of system?  Can anyone suggest a unit that can provide the level of cooling that I need at the above temperatures.

Thanks.

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