{
 "version": "2026-10-20",
 "license": "Dimension sheets are written by Xem Studio from the cited sources and are free to use (CC BY 4.0, attribute 'Xem Studio'). Linked files belong to their publishers under the license shown; Xem Studio does not host them. 'license_verified: false' means the license shown is from memory or the publisher's page as last read and should be confirmed at the link before commercial use.",
 "slug": "thermoacoustic-water-jacket",
 "name": "Thermoacoustic water jacket: 14 mm clamp-on halves for a 2 in tri-clamp tube",
 "kind": "hardware",
 "category": "Stirling engines",
 "group": "Thermoacoustic & fluidyne",
 "year": null,
 "question": "How do I water-cool the ambient heat exchanger of a thermoacoustic engine on a 2 inch tri-clamp spool?",
 "tags": [
  "thermoacoustic",
  "water jacket",
  "cooling",
  "heat exchanger",
  "tri-clamp",
  "long earth society"
 ],
 "aliases": [
  "thermoacoustic water jacket",
  "tri clamp water jacket",
  "cold heat exchanger cooling thermoacoustic",
  "clamp on water cooling 2 inch tube"
 ],
 "overall_mm": {
  "length": null,
  "width": null,
  "height": null
 },
 "official_cad": false,
 "xem_status": "free-files",
 "les": true,
 "free_files": 1,
 "url": "https://xemstudio.com/objects/thermoacoustic-water-jacket/",
 "sheet_txt": "https://xemstudio.com/objects/thermoacoustic-water-jacket/sheet.txt",
 "sheet": {
  "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",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "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."
  ],
  "table": {
   "columns": [
    "feature",
    "value"
   ],
   "rows": [
    [
     "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"
    ]
   ]
  }
 },
 "sheet_text": "Thermoacoustic water jacket: 14 mm clamp-on halves for a 2 in tri-clamp tube — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/thermoacoustic-water-jacket/  (CC BY 4.0)\nBasis: 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\nCatalog version: 2026-10-20\n\nSizes: see table below\n- 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.\n- 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.\n- 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.\n- 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.\n\nfeature  value\nbore  Ø50.8 (tube OD)\nlength  14\noutside  Ø68.8\nchamber  6 deep × 11 long, per half\nspigots  2 per half, Ø6 × 10, Ø4 bore\nbolts  M4 × 25 + nut, one each side\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- Long Earth Society: Engine builds — web, video — LES site — https://longearthsociety.com/engineering/\n\nFree files (CC BY 4.0, Xem Studio; STEP + STL, 1 parts): https://xemstudio.com/files/hardware/thermoacoustic-water-jacket/index.json\nAPI: https://xemstudio.com/api/geometry?object=thermoacoustic-water-jacket\n",
 "sources": [
  {
   "publisher": "Long Earth Society",
   "title": "Engine builds",
   "url": "https://longearthsociety.com/engineering/",
   "formats": [
    "web",
    "video"
   ],
   "license": "LES site",
   "license_verified": true,
   "hosted": false
  }
 ],
 "xem": {
  "status": "free-files",
  "sheet_free": true,
  "mesh_price_usd": null,
  "step_price_usd": null,
  "tolerance_mm": null
 },
 "related": [
  "tri-clamp-jacket-shell",
  "thermoacoustic-heat-exchanger",
  "thermoacoustic-bore-spacer",
  "silicone-tube",
  "list-ta-loop-2in",
  "list-ta-standing-half-wave-2in"
 ],
 "fits": [],
 "dimensions": "exact (nominal, no printing tolerance)",
 "dimension_rule": "All geometry on Xem Studio is exact (nominal, true size) with no printing tolerance. Where a part meets another part, the object lists its mating features (feature, exact size, what it mates with, fit class: press, slide, run, socket, clamp or designed). Apply your process's allowance to those features only; 'designed' gaps are part of the design and stay as drawn.",
 "mating": [
  {
   "feature": "bore",
   "exact": "Ø50.8",
   "mates": "2 in tube OD",
   "fit": "clamp",
   "files": "ta-jacket-half-"
  },
  {
   "feature": "split",
   "exact": "1.0 total (0.5 per half)",
   "mates": "the other half",
   "fit": "clamp",
   "files": "ta-jacket-half-"
  },
  {
   "feature": "ear holes",
   "exact": "Ø4.5",
   "mates": "M4 clearance (ISO 273 medium)",
   "fit": "designed",
   "files": "ta-jacket-half-"
  },
  {
   "feature": "hose spigots",
   "exact": "Ø6 × 10, Ø4 bore",
   "mates": "6 mm ID hose",
   "fit": "press",
   "files": "ta-jacket-half-"
  },
  {
   "feature": "start from the clamp face",
   "exact": "9.35",
   "mates": "clamp reaches 8.83 from the face",
   "fit": "designed",
   "files": "ta-jacket-half-"
  }
 ],
 "fit_classes": {
  "press": "stays put: pin, tube, bearing or magnet held by interference. Typical FDM: hole +0.0 to +0.1 mm on diameter.",
  "slide": "assembles by hand and is held by a grub, pinch or clamp: shaft in a hub, rod in a socket, spigot in a bore. Typical FDM: +0.2 mm.",
  "run": "turns or slides in use: pin in a link, rod through a guide. Typical FDM: +0.3 mm.",
  "socket": "large sliding fit: syringe barrel, sleeve, bobbin in a bore. Typical FDM: +0.3 mm.",
  "clamp": "split part that closes on the mating part with screws: make it at size.",
  "designed": "a gap that is part of the design (piston fit option, displacer gap, air gap): do not change."
 },
 "faq": [
  {
   "q": "Why only 14 mm long?",
   "a": "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."
  },
  {
   "q": "Can I use the 56 mm jacket instead?",
   "a": "Not on these cores: it would reach the hot exchanger. It suits the Stirling hot and cold spools."
  }
 ],
 "files_license": null,
 "offers": [
  {
   "file": "ta-jacket-half-2in-14",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "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",
   "note": "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°"
  }
 ],
 "markdown": "https://xemstudio.com/objects/thermoacoustic-water-jacket/index.md"
}