Happy HolidaySs Giveaway - Winners Re-Re-Re-Re-Drawn - 24 hours to Claim!

Get your HBT Growlers, Shirts and Membership before the Rush!


Home Brew Forums > Home Brewing Beer > DIY Projects > Chillers and Stir Plates > Immersion chiller upgrade tests, series vs parallel
Reply
 
LinkBack Thread Tools
Old 06-23-2011, 03:08 AM   #1
cfrazier77
Senior Member
HBT_LIFETIMESUPPORTER.png
Feedback Score: 0 reviews
 
cfrazier77's Avatar
Recipes 
 
Join Date: Mar 2011
Location: Troy, IL
Posts: 617
Liked 79 Times on 54 Posts
Likes Given: 70

Default Immersion chiller upgrade tests, series vs parallel

In a previous thread, http://www.homebrewtalk.com/f51/imme...tation-252421/ , it was suggested to split the incoming water and have it go to each coil, parallel. I had it set up for the water to go from one coil and into the second, series. I said that I would test the chiller both ways and had time this afternoon to do it.
http://www.homebrewtalk.com/attachme...1&d=1308793107
http://www.homebrewtalk.com/attachme...1&d=1308793245
Here are the details of the test.
I brought 10 gallons of water to boil in a keggle outside and it was 87 degrees.
The water temp out of the hose was 62.5 degrees.
I started cooling once I had a roiling boil. I took the temp at 10 minutes, the time at 90 degrees, and the time at 80 degrees.

Series,
After ten minutes, 102 degrees
90 degrees 12 minutes
80 degrees 17 minutes

Parallel
After ten minutes, 106 degrees
90 degrees 14 minutes
80 degrees 18 minutes

So it came out that series worked better in this case than parallel. So if you have a 25' immersion chiller adding a second coil can really improve cooling.

img_7292.jpg   img_7296.jpg  
__________________

Happy Dog Brewing

cfrazier77 is offline
 
Reply With Quote Quick reply to this message
Old 06-23-2011, 03:32 AM   #2
mrk305
Beer Dude in the Sunset
HBT_LIFETIMESUPPORTER.png
Feedback Score: 0 reviews
 
mrk305's Avatar
Recipes 
 
Join Date: May 2007
Location: Georgia
Posts: 1,720
Liked 11 Times on 11 Posts
Likes Given: 22

Default

Wow. All things being equal (flow rate, water temp) I thought the parallel would be quicker than in series.

__________________
Carport Brewery, Lilburn GA

Any advise offered after 10:00p.m. should be regarded as questionable
I can't brew until something is empty
mrk305 is offline
 
Reply With Quote Quick reply to this message
Old 06-23-2011, 04:49 PM   #3
horseinmay
Feedback Score: 0 reviews
Recipes 
 
Join Date: May 2011
Location: Orange County, California
Posts: 215
Liked 11 Times on 9 Posts
Likes Given: 19

Default

Quote:
Originally Posted by mrk305 View Post
Wow. All things being equal (flow rate, water temp) I thought the parallel would be quicker than in series.
I think that running it in series allows the outflowing water to become hotter, making the system more efficient. The temperature difference between water flowing in and water flowing out is directly related to the efficiency of the system. Nice work.
__________________
horseinmay is offline
 
Reply With Quote Quick reply to this message
Old 06-23-2011, 05:44 PM   #4
Atl300zx
Feedback Score: 0 reviews
Recipes 
 
Join Date: Jun 2007
Location: Hoplanta, Georgia
Posts: 746
Liked 3 Times on 3 Posts

Default

how much water was used in each scenario?

__________________
Jaded Spirits Brewery
Primary: Dennis Hoppier III
Secondary: Empty
Bottles: Triple Berry Apple Cider, Cote Apple Cider, Wild Blackberry Apple Cider, Dim Wit II, Mighty Porter
Kegs: 4Cs IPA - The Diamond Standard, Innis & Gunn Rum Cask Clone.
On Deck: The "Three Stouts", Wild Blackberry Mead, Irish Red

Jaded Spirits DIY Stirplate
Blog @ JadedSpirits.com
Blog @ HBT
Atl300zx is offline
 
Reply With Quote Quick reply to this message
Old 06-23-2011, 05:49 PM   #5
Maxkling
Feedback Score: 0 reviews
Recipes 
 
Join Date: Oct 2010
Location: Atlanta, Georgia
Posts: 509
Liked 23 Times on 10 Posts

Default

Since there is almost no real difference, why not use the smaller coil as a prechiller. That will honestly work the best.

__________________

"It’s so simple to be wise. Just think of something stupid to say and then don’t say it."

"Gun Control Means Using Both Hands."

Maxkling is offline
 
Reply With Quote Quick reply to this message
Old 06-23-2011, 06:03 PM   #6
_JP_
Feedback Score: 0 reviews
Recipes 
 
Join Date: Mar 2011
Location: Woodstock, GA
Posts: 311
Liked 4 Times on 4 Posts

Default

Hmmm.... this goes against what my heat transfer classes taught. Not quite buying it yet.

The energy transfer is proportional to the temp difference between the wort and coil. Lets use the entering and exiting coil temps to get an average coil temp. With shorter coils, the average temp will be lower, since surface area of 1 coil is half the surface area of the system of coils, and has less contact time with the wort.

With 2 coils, at a lower avg temp, (assuming same flowrate for parallel or series configuration), the parallel should cool significantly faster.

I'm guessing a restriction in the supply caused a reduction in water flow. Hence, the question of water volume above is extremely relevant.

__________________

Working on:
summer gardening

Upcoming projects:
NG line for outdoor burner

_JP_ is offline
 
Reply With Quote Quick reply to this message
Old 06-23-2011, 07:20 PM   #7
shortyjacobs
Feedback Score: 0 reviews
Recipes 
 
Join Date: Aug 2009
Location: Twin Cities, MN
Posts: 2,511
Liked 29 Times on 29 Posts
Likes Given: 3

Default

Quote:
Originally Posted by _JP_ View Post
Hmmm.... this goes against what my heat transfer classes taught. Not quite buying it yet.

The energy transfer is proportional to the temp difference between the wort and coil. Lets use the entering and exiting coil temps to get an average coil temp. With shorter coils, the average temp will be lower, since surface area of 1 coil is half the surface area of the system of coils, and has less contact time with the wort.

With 2 coils, at a lower avg temp, (assuming same flowrate for parallel or series configuration), the parallel should cool significantly faster.

I'm guessing a restriction in the supply caused a reduction in water flow. Hence, the question of water volume above is extremely relevant.
Yeah, this is curious to me as well.

With shorter coils, average temp should be lower. Also, if the supply hose, is significantly larger in diameter than the tubing, (garden hose, for example), then your flowrate through the parallel setup will be much higher, (think resistors in parallel vs. series, for you electrical nuts). Higher flowrate = faster, (though less efficient), cooling.

Of course, if the flow is provided by a kitchen sink, which is only using 3/8" supply hose, then the flowrate difference wouldn't be as pronounced.
__________________
Itchy Dog Brewery.

(As of 10-24-2011)
Primary - Steppe 112 PA, 2x Monday RyePA
Aging - None :-(
On tap - Big Dog, Apfelwein, Steppe 112 PA

My invisible AG sculpture, with no actual sculpture and a tiny footprint.
My Kegerator goes offroading!
My Coors Home Draft dispenser for boating/beering on the go.
shortyjacobs is offline
 
Reply With Quote Quick reply to this message
Old 06-23-2011, 08:02 PM   #8
CrazedArmadillo
Feedback Score: 0 reviews
Recipes 
 
Join Date: Jan 2011
Location: Durham, NC
Posts: 36
Liked 1 Times on 1 Posts

Default

yeah, I'm interested in how exactly you hooked up the water supply for series vs. parallel? Any supply restrictions would play a big factor in the efficiency of the parallel coils.

__________________
CrazedArmadillo is offline
 
Reply With Quote Quick reply to this message
Old 06-23-2011, 08:03 PM   #9
cfrazier77
Senior Member
HBT_LIFETIMESUPPORTER.png
Feedback Score: 0 reviews
 
cfrazier77's Avatar
Recipes 
 
Join Date: Mar 2011
Location: Troy, IL
Posts: 617
Liked 79 Times on 54 Posts
Likes Given: 70

Default

Quote:
Originally Posted by Atl300zx View Post
how much water was used in each scenario?
I don't know what the volume of water was. I turned the facet for the hose fully open for both runs.
__________________

Happy Dog Brewing

cfrazier77 is offline
 
Reply With Quote Quick reply to this message
Old 06-23-2011, 08:04 PM   #10
cfrazier77
Senior Member
HBT_LIFETIMESUPPORTER.png
Feedback Score: 0 reviews
 
cfrazier77's Avatar
Recipes 
 
Join Date: Mar 2011
Location: Troy, IL
Posts: 617
Liked 79 Times on 54 Posts
Likes Given: 70

Default

Quote:
Originally Posted by Maxkling View Post
Since there is almost no real difference, why not use the smaller coil as a prechiller. That will honestly work the best.
I did not test just using the original 25' chiller. But from using it in the past it by itself takes at least 10 minutes longer than either method tried here.
__________________

Happy Dog Brewing

cfrazier77 is offline
 
Reply With Quote Quick reply to this message
Reply



Quick Reply
Message:
Options
Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
My Mother of Fermentation Chiller (and other Steel Horse Brewery upgrade) MetallHed Fermenters 10 04-24-2013 06:27 PM
Immersion chiller upgrade and Redneck fermentation cfrazier77 Chillers and Stir Plates 11 06-23-2011 03:09 AM
Immersion Chiller help Newbeerguy Chillers and Stir Plates 12 11-25-2009 02:37 PM
Immersion Chiller in PDX nicadrick Chillers and Stir Plates 1 11-13-2009 04:32 AM
New immersion chiller ghack Chillers and Stir Plates 6 02-16-2009 11:34 PM



Newest Threads

LATEST SPONSOR DEALS