# Thermoacoustic water jacket: 14 mm clamp-on halves for a 2 in tri-clamp tube

> How do I water-cool the ambient heat exchanger of a thermoacoustic engine on a 2 inch tri-clamp spool?

- Category: Stirling engines › Thermoacoustic & fluidyne
- Kind: Hardware
- Basis: Bore = ASME BPE 2 in tube OD Ø50.8; length and start position from the exchanger positions in tools/gen_ta_family.py; ISO 273 medium clearance for M4
- Page: https://xemstudio.com/objects/thermoacoustic-water-jacket/ · JSON: https://xemstudio.com/api/geometry?object=thermoacoustic-water-jacket · Plain text: https://xemstudio.com/objects/thermoacoustic-water-jacket/sheet.txt
- License: dimension sheet CC BY 4.0 (Xem Studio); linked files under their publishers' licenses
- Use in every chat: add https://xemstudio.com/mcp as a connector (https://xemstudio.com/use-with-ai/)

**Exact dimensions.** Every file is drawn at true size with no printing tolerance. The holes and pins that meet another part are listed below under Mating features, with the fit each joint needs; open those by your printer's or process's clearance before making the part.

## Notes

- A short jacket for the one place a thermoacoustic core must be held at room temperature: the tube wall over an ambient heat exchanger. It is 14 mm long so it covers the 10 mm exchanger and stops before the regenerator or stack; it starts 9.35 mm from the clamp face, 0.5 mm clear of the clamp.
- Two identical halves close on the tube with one M4 × 25 and nut each side. Each half has its own closed water chamber (6 mm deep, 11 long) and two Ø6 hose spigots, in and out; run the two halves in series with a short hose, or in parallel.
- The inner wall is the heat path: tube wall, jacket wall, water. What it is made of is the builder's choice; the file is the geometry.
- Fits: bore clamps on the tube OD (the 1 mm split is the take-up); spigots are a press fit in 6 mm ID hose; ear holes are M4 clearance.

## Mating features (exact size; open press / slide / run / socket by your process clearance, leave designed and clamp as drawn)

| feature | exact | mates with | fit | files |
|---|---|---|---|---|
| bore | Ø50.8 | 2 in tube OD | clamp | ta-jacket-half-* |
| split | 1.0 total (0.5 per half) | the other half | clamp | ta-jacket-half-* |
| ear holes | Ø4.5 | M4 clearance (ISO 273 medium) | designed | ta-jacket-half-* |
| hose spigots | Ø6 × 10, Ø4 bore | 6 mm ID hose | press | ta-jacket-half-* |
| start from the clamp face | 9.35 | clamp reaches 8.83 from the face | designed | ta-jacket-half-* |

## Sizes

| feature | value |
|---|---|
| bore | Ø50.8 (tube OD) |
| length | 14 |
| outside | Ø68.8 |
| chamber | 6 deep × 11 long, per half |
| spigots | 2 per half, Ø6 × 10, Ø4 bore |
| bolts | M4 × 25 + nut, one each side |

## Where the files are

- Long Earth Society: [Engine builds](https://longearthsociety.com/engineering/) — web, video — LES site

## Free STEP/STL (1 parts, CC BY 4.0, Xem Studio)

Index: https://xemstudio.com/files/hardware/thermoacoustic-water-jacket/index.json

- ta-jacket-half-2in-14: [STEP](https://xemstudio.com/files/hardware/thermoacoustic-water-jacket/ta-jacket-half-2in-14.step) · [STL](https://xemstudio.com/files/hardware/thermoacoustic-water-jacket/ta-jacket-half-2in-14.stl) — water-jacket half for the 2 in tube (Ø50.8) × 14: walls 1.5, chamber 6 deep, ends 1.5, split wall 1.5; ears x ±33–47 with Ø4.5 at ±41; two Ø6 × 10 spigots (Ø4 bore) at 60° and 120°

## Questions

**Why only 14 mm long?**

The ambient exchanger is 10 mm; a longer jacket would also cool the regenerator or stack next to it and take away the temperature difference the engine runs on.

**Can I use the 56 mm jacket instead?**

Not on these cores: it would reach the hot exchanger. It suits the Stirling hot and cold spools.

## Fits with

- [Tri-clamp jacket shell: clamp-on sealed jacket for a 2 in tube](https://xemstudio.com/objects/tri-clamp-jacket-shell/)
- [Thermoacoustic heat exchangers, hot and cold, parallel plate, for 1.5, 2 and 3 in tri-clamp spools](https://xemstudio.com/objects/thermoacoustic-heat-exchanger/)
- [Thermoacoustic bore spacers and liners for 2 in tri-clamp spools: 8.4, 60 and 61.7 mm](https://xemstudio.com/objects/thermoacoustic-bore-spacer/)
- [Silicone tube 1 × 3 to 10 × 14 mm (ID × OD)](https://xemstudio.com/objects/silicone-tube/)
- [Build list: Thermoacoustic traveling-wave loop, 2 in tri-clamp](https://xemstudio.com/objects/list-ta-loop-2in/)
- [Build list: Thermoacoustic standing-wave engine, half-wave, propane, 2 in tri-clamp](https://xemstudio.com/objects/list-ta-standing-half-wave-2in/)