Homebrew Wort Cooler, Twin Coil Immersion Type
Intro: Homebrew Wort Cooler, Twin Coil Immersion Type
Wort (pronounced Wert) is the hot malt liquor that beer is made from, before the yeast can be pitched (added to the Wort) it must be cooled down to around 30°C other wise the yeast will be killed. This cooling process if unaided can take hours which besides being impractical exposes the the freshly made beer to airborne bacteria and undesirable wild yeasts. For this reason the Wort is cooled down to a practical temperature using a Wort cooler or Wort chiller.
There are two common types of Wort cooler counter flow and immersion, this instructable details the build process for the doommeisters twin coil immersion Wort cooler. Immersion Wort coolers as the name suggests are immersed in the hot Wort and cold water is passed through the cooler thus bring the temperature of the Wort down.
For small batches immersion coolers are much easier to clean and sterilise than counter flow coolers, this is because they can be sterilised in the hot Wort itself by adding the cooler in for the last 15min.
There are many plans and photos on the Internet for this kind of cooler so this is not really an original design more an interpretation.
STEP 1: You Will Need
Metric sizes are shown, American imperial sizes in brackets.
1.5m of 15mm (1/2”) OD copper pipe.
15 – 20m 10mm (3/8”) OD copper pipe.
2, 15mm (1/2”) copper Tee fittings, sweat or solder ring.
6, 15mm (1/2”) copper elbow fittings, sweat or solder ring.
4, 15mm (1/2”) to 10mm (3/8”) reducing fittings, sweat or solder ring.
Solder, 99c lead free.
Flux
4” pipe and 6” pipe or similar to use as coil formers.
Pipe cutter.
Gas torch.
Heat resistant mat.
A selection of other hand tools.
Additionally you will need some hose or food safe tubing to connect the cooler to cold tap and back out to drain.
STEP 2: Pepare 15mm Pipe
Using the pipe cutter cut the 15mm pipe into 4 x 100mm lengths, 2 x 350mm lengths and 2 x 35mm lengths. These sizes can be adjusted to make your cooler suit the size of your Wort boiler.
STEP 3: Form Cooling Coils
Using a short length of 4” plastic pipe the middle coil can be formed by bending the 10mm copper around the pipe. Do this slowly to avoid kinking the pipe, when 12 to 15 coils have been formed cut the copper coil from the and leave 300mm or so as a tail for assembly.
Repeat the process using a 6” or 8” pipe or bucket to form the larger outer coil.
STEP 4: Dry Assemble
Dry assemble the cooler, make the flow and return pipes by fitting an elbow to the bottom of one of the 350mm lengths of 15mm copper to the top of this add a Tee fitting such that the T connection is offset tot the side. Into the other the other end fit a 100mm length of copper pipe and fit an elbow to the top add a final 100mm length to form a tail such that the cooler can be connected to hose pipe. Into the T port fit the 35mm length of copper and insert a second elbow.
Now dry fit the 2 coils to the flow and return pipes, ensure that each coil is piped to the flow and return pipe.
STEP 5: Solder
When you are happy with the dry fit it is time to solder each of the joints, clean each joint with wire wool or scotch brite in order to remove the oxidised layer from the copper. Flux each joint well and solder.
In order to add some rigidity two lengths of flattened copper pipe were soldered between the flow and return pipes.
STEP 6: Clean
Before use the cooler must be cleaned, in the first instance this means removing flux and oxidisation from the pipes with wire wool or similar. The cooler should then be thoroughly washed and sanitised before use.
The doommeister doesn't have a brew planned for a week or two, in use photos to follow.
STEP 7: In Use
Cleaning was done using a scouring pad and soapy water to remove flux and oxide deposits, then clear distilled malt vinegar was used to clean the copper. Before use the cooler should be rinsed in clean water and sanitised in the last ten minute of the boil.
In use the cooler took around 8 minutes to cool the Wort from boiling to 29/30º.
A couple of usfull links below
Commercial wort coolers
This cooler was my inspiration for the twin coil design.
25 Comments
Chard 14 years ago
well ill post mine in a bit anyway as its a solder free version. keep up the homebrew!
Chard
el greeno 8 years ago
David P 13 years ago
t.rohner 13 years ago
paralyzedcitizen 14 years ago
doommeister 13 years ago
doommeister 14 years ago
I would expect based on similar designs that it would cool the Wort in 15 - 25 minutes for a 5 gallon batch.
paralyzedcitizen 14 years ago
I look forward to hearing how it does, it looks really cool!
glorybe 14 years ago
doommeister 14 years ago
I would not recommend leaded solder for any potable use, but am unsure whether lead is even soluble in alcohol (if someone knows than let me know 'cause I would want to poison myself either). Most cases of lead poisoning in homebrew seem to be attributable to the use of older enamelled vessels with lead based pigments.
As for flares or compression fittings I decided against these as they would be more difficult to sanitise.
With regard to condensing Alcohol then if someone wanted to do this then they should make them selves cogisent of ALL the risks involved with that particular process.
doommeister 13 years ago
I think the best option if anybody was concerned about this would be just to use a loop of copper or stainless and not submerge any fittings. I have gone back to thinking this isn't much of an issue.
lemonie 14 years ago
L
doommeister 14 years ago
I estimate the build cost around £35 including the fittings
lemonie 14 years ago
L
doommeister 14 years ago
When I get round to putting my shed up I think I might well be reading your instructable, for information purposes only of course.
mikeasaurus 14 years ago
For homebrewing (>23L), what's the benefit of this method over letting it stand to cool before pitching?
mf5325 14 years ago
doommeister 14 years ago
nanosec12 14 years ago
Tool Using Animal 14 years ago