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Water tray for a 10 in cold cap (optional)
How do I cool the top of a big flat Stirling engine? · Hardware · basis: Exact geometry
Long Earth Society build part. Parts of the HTD engines. The engines
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. Mating features
- sizes
- 1 in table
Notes
- A separate heat exchanger, optional: an open ring tray that sits on the cold cap's flat top round the 2 in ferrule and holds water. The cap takes about the cup wall's leak plus the engine's rejected heat (a few hundred watts at full fire), so the water warms and has to be topped up; ice water helps. The engine runs without it, hotter on the cold side.
Sizes
| id_mm | od_mm | height_mm |
|---|---|---|
| 118.0 | 190.0 | 40.0 |
Mating features
Drawn at the exact size. Open press, slide, run and socket features by your process's clearance; leave designed gaps and clamp fits as drawn.
| feature | exact | mates with | fit | files |
|---|---|---|---|---|
| floor | Ø118–Ø190 | cold cap flat top (sits on it) | designed | all |
| ID | Ø118 | 2 in ferrule, clamp and gauge boss (no contact) | designed | all |
Where the files are
Other publishers' files are linked, not hosted. "verify" = check the license at the link before commercial use.
| Long Earth Society | Engine builds | web, video | LES site |
Free files
★ Free files 1 parts. Generated by Xem Studio from the standard; threads are plain cylinders at major diameter. CC BY 4.0. index.json
| water-tray-10in | water tray (heat exchanger, optional): ring Ø118/Ø190 × 40, 2 walls and floor, sits on the cap's flat top | STEP · STL |
Plain text: sheet.txt · JSON: /api/geometry?object=htd-water-tray-10in
How it fits
In these build lists
HTD engine, 10 in tri-clamp…A big flat gamma Stirling for a propane burner: a Ø240 displacer in a 10 in weld…You might also need
Questions
Does the engine need the tray?
No, but the cold side runs hotter and the output drops without it.