New Giveaway - Wort Monster Conical Fermenter!

Home Brew Forums > Home Brewing Beer > All Grain & Partial Mash Brewing > CFC flow rate for wort and hose




Reply
 
LinkBack Thread Tools Display Modes
Old 06-15-2009, 04:03 AM   #1
AZ_IPA
PKU
HBT_LIFETIMESUPPORTER.png
Feedback Score: 0 reviews
 
AZ_IPA's Avatar
Recipes 
 
Join Date: Jun 2008
Location: The Cold Part of AZ
Posts: 40,617
Liked 5732 Times on 5098 Posts
Likes Given: 568

Default CFC flow rate for wort and hose

I tried some searches and came up with not too much...

here's my question - what's the general consensus for flow rates for a gravity fed CFC system?

- boil kettle wide open and CFC hose wide open?
- boil kettle 1/2 open CFC hose wide open?
- boil kettle wide open and CFC hose 1/2 open?
- both half open?

my intuition says that with my ~62*F tap water, I want as much contact with the hot wort as possible...

thanks!



__________________
AZ_IPA is offline
 
Reply With Quote Quick reply to this message
Old 06-15-2009, 04:43 AM   #2
JMSetzler
Feedback Score: 0 reviews
Recipes 
 
Join Date: Dec 2008
Location: Hickory, North Carolina
Posts: 840
Liked 7 Times on 7 Posts

Default

The slower your flow rate from the boil kettle and the higher your flow rate through the hose, the closer to that 62° you will get...



__________________
brewsandblues.org - Beer and Smokin' Blues
JMSetzler is offline
 
Reply With Quote Quick reply to this message
Old 06-15-2009, 06:25 PM   #3
AZ_IPA
PKU
HBT_LIFETIMESUPPORTER.png
Feedback Score: 0 reviews
 
AZ_IPA's Avatar
Recipes 
 
Join Date: Jun 2008
Location: The Cold Part of AZ
Posts: 40,617
Liked 5732 Times on 5098 Posts
Likes Given: 568

Default

Quote:
Originally Posted by JMSetzler View Post
The slower your flow rate from the boil kettle and the higher your flow rate through the hose, the closer to that 62° you will get...
I would think you would want them both at about the same right - if the water is flowing too fast it won't pick up enough heat, right?
__________________
AZ_IPA is offline
 
Reply With Quote Quick reply to this message
Old 06-15-2009, 06:50 PM   #4
Bobby_M
Vendor and Brewer
HBT_SPONSOR.png
Vendor Ads 
Feedback Score: 1 reviews
 
Bobby_M's Avatar
Recipes 
 
Join Date: Aug 2006
Location: Piscataway, NJ
Posts: 21,731
Liked 853 Times on 572 Posts
Likes Given: 26

Default

If we're talking about the 3/8" OD x 25' deal, you should be able to run wort wide open, tap water at about 1/2 and get within a couple degrees of the coolant temp especially on a gravity drain. If you find that the wort output is a bit too cool, you can throttle back the coolant even more which is common in the winter. When my tap is 45F, I pump the wort full speed and have the coolant valve at about 1/8th open.

When coolant temp hits 70F in mid summer, I run the wort at about 1/2 and the coolant at full. That gets the wort out at about 73F. You'll have to experiment and measure the wort output temp often.

__________________
BrewHardware.com
Sightglass, Refractometer, Ball Valve, Weldless bulkhead, Thermometer, Decals, Stainless Steel Fittings, Compression Fittings, Camlock Quick Disconnects, Scale, RIMS tube, Plate Chiller, Chugger Pump, Super Clear Silicone Tubing, and more!
Bobby_M is offline
 
Reply With Quote Quick reply to this message
Old 06-15-2009, 06:56 PM   #5
dstar26t
If it's worth doing, it's worth overdoing
HBT_SUPPORTER.png
Feedback Score: 0 reviews
Recipes 
 
Join Date: Jan 2008
Location: Ridley Park, PA
Posts: 1,136
Liked 17 Times on 16 Posts

Default

If you're going to experiment with water before using wort, keep in mind that water is more easily cooled than wort. I found it to be ~7 degrees under similar circumstances if I remember correctly.

__________________

Next: Pre-Prohibition Pilsner
Fermenting: Rye Berliner Weisse, Barrel Fermented Dreg Lambic, Brett Trois Helles, Sauerkraut Fermented Gose, Carrot Blossom Cedar Mead
Drinking: 1830's Mild, Rye Session IPA, Lambic, Brett Blonde, Kriek, Saison, Sour Blonde, RIS v1 & v2
Barrel aged: RIS, Rye Barleywine, Wee-Heavy, Tripel

dstar26t is offline
 
Reply With Quote Quick reply to this message
Old 06-15-2009, 08:20 PM   #6
AZ_IPA
PKU
HBT_LIFETIMESUPPORTER.png
Feedback Score: 0 reviews
 
AZ_IPA's Avatar
Recipes 
 
Join Date: Jun 2008
Location: The Cold Part of AZ
Posts: 40,617
Liked 5732 Times on 5098 Posts
Likes Given: 568

Default

Thanks for the input fellas.

yes Bobby, it's a 3/8" OD x 25' with a gravity drain. I'll start wide-open wort and 1/2 coolant, and adjust as needed.

__________________
AZ_IPA is offline
 
Reply With Quote Quick reply to this message
Old 06-15-2009, 08:59 PM   #7
goatchze
Feedback Score: 0 reviews
Recipes 
 
Join Date: Nov 2008
Location: College Station, TX
Posts: 108
Default

AZ,

Don't forget that the height of your kettle over the exit of your CFC is going to make a difference. The velocity of the wort leaving the CFC (if we neglect friction) is

v=Sqrt(2gh)

where
v=velocity, ft/s
g=accel gravity (32.2 ft/s^2)
h=height from fluid level in kettle to bottom of CFC, ft

your volumetric flow, then is V=v*Pi*r^2

where
V=volumetric flow, ft^3/s
Pi=3.14
r=diameter of copper tube in ft

Point is: the bigger the h, the faster the wort flows. The faster the wort flows, the faster the water will need to flow through a fixed exchanger!

__________________
goatchze is offline
 
Reply With Quote Quick reply to this message
Old 06-15-2009, 09:23 PM   #8
JMSetzler
Feedback Score: 0 reviews
Recipes 
 
Join Date: Dec 2008
Location: Hickory, North Carolina
Posts: 840
Liked 7 Times on 7 Posts

Default

Quote:
Originally Posted by goatchze View Post
AZ,

Don't forget that the height of your kettle over the exit of your CFC is going to make a difference. The velocity of the wort leaving the CFC (if we neglect friction) is

v=Sqrt(2gh)

where
v=velocity, ft/s
g=accel gravity (32.2 ft/s^2)
h=height from fluid level in kettle to bottom of CFC, ft

your volumetric flow, then is V=v*Pi*r^2

where
V=volumetric flow, ft^3/s
Pi=3.14
r=diameter of copper tube in ft

Point is: the bigger the h, the faster the wort flows. The faster the wort flows, the faster the water will need to flow through a fixed exchanger!
There is a terminal velocity that you failed to mention If the height of the fluid drain from the kettle is 60' or so above the ground, the draining wort will reach terminal velocity where elevating the source any higher would not impact the flow rate
__________________
brewsandblues.org - Beer and Smokin' Blues
JMSetzler is offline
 
Reply With Quote Quick reply to this message
Old 06-15-2009, 09:34 PM   #9
AZ_IPA
PKU
HBT_LIFETIMESUPPORTER.png
Feedback Score: 0 reviews
 
AZ_IPA's Avatar
Recipes 
 
Join Date: Jun 2008
Location: The Cold Part of AZ
Posts: 40,617
Liked 5732 Times on 5098 Posts
Likes Given: 568

Default

Quote:
Originally Posted by JMSetzler View Post
There is a terminal velocity that you failed to mention If the height of the fluid drain from the kettle is 60' or so above the ground, the draining wort will reach terminal velocity where elevating the source any higher would not impact the flow rate
well, then I'm screwed - mine is about 75' above the ground

I ran 5.75 gallons of water through it yesterday in about 17 minutes, so I'm assuming a drain time of ~20 for wort
__________________
AZ_IPA is offline
 
Reply With Quote Quick reply to this message
Old 06-15-2009, 10:31 PM   #10
JMSetzler
Feedback Score: 0 reviews
Recipes 
 
Join Date: Dec 2008
Location: Hickory, North Carolina
Posts: 840
Liked 7 Times on 7 Posts

Default

Quote:
Originally Posted by AZ_IPA View Post
well, then I'm screwed - mine is about 75' above the ground

I ran 5.75 gallons of water through it yesterday in about 17 minutes, so I'm assuming a drain time of ~20 for wort
I have very little experience with counterflow chillers. I built one way back in the early days of my homebrewing. I didn't like it much and switched back to my IC. I even had a submersible pump that was connected to a rheostat where I could control my flow through the chiller. It was fun to build but for some reason that I can't exactly explain, I just like the IC.

I'm thinking about buying another submersible pump and using it with the immersion chiller and recirculating ice water in the warmer months...


__________________
brewsandblues.org - Beer and Smokin' Blues
JMSetzler is offline
 
Reply With Quote Quick reply to this message
Reply


Quick Reply
Message:
Options
Thread Tools
Display Modes


Similar Threads
Thread Thread Starter Forum Replies Last Post
IC: Flow rate and efficiency html034 Equipment/Sanitation 14 05-12-2010 12:14 AM
Fly Sparging flow rate? sstenger All Grain & Partial Mash Brewing 23 02-27-2009 05:28 PM
March 809 HS pump flow rate Søren T Equipment/Sanitation 19 09-23-2008 11:13 PM
wort chiller water flow rate pherball Equipment/Sanitation 11 04-11-2008 02:03 PM
Flow Rate for Wort Chiller trubador General Techniques 19 09-22-2006 12:28 AM