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[Guide] Horizontal Volenti coolers

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A horizontal volenti cooler is possible the most cost-effective way to cooler a computer. you will get anywhere between 0 and 10 degrees below ambient depending on how well the cooler works.

It replaces the pump, radiator and if you want, reservoir, in a watercooling build. this would work extra well with a TEC pate, but no-one has tried yet. Volenti's evaporate water, and get cold temps as a result.





Evaporative coolers were first used for PCs in the form of bongs, air went in, took some water with it when it left. In ~2005, an Australian by the name of "Volenti" on a forum that no longer exists, used cloth in his bong, improving performance dramatically. Then nub and naja002 made the current design.


How a bong cooler works:





Single-loop VS Dual-loop


Single loop can be smaller, is cheaper to begin and uses less parts, but requires filtered air and a constant supply of distilled water.

Dual loop only needs a few litres of distilled a year, but a constant supply of normal water. It needs an extra pump and heat exchanger, it also has slightly worse temps. This is the cheaper option in the long run because tap water is so much cheaper than distilled.


Building the cooler


Part 1, components


To build the cooler, you will need:


Waterblocks (for the PC components, use the same as you would in an WC build)

A water-tight container (this holds the cooler, so far, everyone has used storage containers about 55L in size)

A pump (this moves the water to the blocks and then to the cloth)

Distilled water (if single-loop: you constantly need to replenish levels with more. if dual-loop: you need ~1 litre)

Fan(s) (this isn't necessary, but highly recommended. You can use any fan you want, as long as it doesn't crush the cooler)

Tubing: Tubing for inside the PC, tubing to join the PC and cooler, lots of internal tubing (for the evaporative part)

Fittings: screw in fittings for the blocks and pump, fittings for where the tubes leave and enter the cooler and the PC case, 3 or 4 L barbs in the size that works with your in-cooler tubing, many T barbs (for use joining rows of tubes)

Cloth (lots of)


Tip: Using L barbs improves looks and compactness but means the pump has to be better, use I barbs if the pump isn't strong enough.


If dual-loop, you will also need:

A heat exchanger (car transmission-coolers work very well)

Another reservoir

Another Pump

More tubing and fittings


Part 2, The evaporative tubes.

This is the part that spreads the water and wets the cloth.


1. Measure the tubing and inner parts of your T and L barbs and mark where you need to cut.

2. Cut, the join everything together. Put an extra T barb (with tubing) somewhere so water can be pushed in.

3. drill a small hole every few centimetres for the water to escape, you want the water to go less than 1cm up, so drill until that happens.

4. check the cloth fits, the put this aside for later.


Part 2, preparing the container.

Cut all the relevant holes in the container.

1. On the lid/top of the container, make one whole for a fan, one for air and power cables to escape through

2. Attach a fan to the fan hole.

3. On the end that will be parallel to the back of the PC, make a hole about 5cm from the base, and one 5cm from the top. make these large enough to hold a barb.

4. Glue/silicone a L or I barb into each hole, these holes are where water leaves (bottom) and enters (top) the cooler.

5. If you need holes to hold the cloth and tubes, make them now.


Part 3, In the PC.

If your case doesn't a have a place to have the tubing leave, make one or remove a PCI bracket (it should give enough space.

1. Install waterblocks. join all the waterblocks.

2. Make the 2 tubes that didn't connect to a waterblock (in at the start of the loop, out at the end) long enough to reach the case exit hole, no further.

3. Add an L barb to each end (outside the case), pointed to the cooler.


Part 4, plumbing.


1. Cut two pieces long enough to reach from the PC to the cooler, cut all the small pieces you will need inside the cooler.

2. Set the internal loop up like so:

Single-loop: Space inside cooler --> Pump --> Out-barb --> PC --> In-barb --> Tubing --> Cloth --> Space inside cooler

Dual-loop: loop 1: Space inside cooler --> Pump1 --> Tubing --> Cloth --> Space inside cooler

loop 2: Reservoir --> Pump2 --> Heat exchanger --> Out-barb --> PC --> In-barb --> Reservoir

In a dual-loop the reservoir can be inside the PC, adjust the instructions accordingly.


Part 5, finishing.

1. Assemble, add LEDs if you want, give everything power.

2. Leak test.

3. Post your results here


If you have pictures i can use, let me know. i need more

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