Gallery, Projects and General > How do I??
Electric heater for hot air engine?
vtsteam:
I've found that plaster of Paris and sand mix has worked well as a furnace lining for my aluminum melting propane furnace in the past. Plaster of Paris is a good heat insulator because it's porous, and the sand provides structural strength against cracking that pure plaster of Paris normally lacks.
One way to make a heater might be to wrap the wire around a waxed wood mandrel of say 1.5" (38mm) dia. Set that in a larger form and pour the mix over. Remove the mandrel when cured. If the form was rectangular and the mandrel located at the proper distance from the edges, it could be stood on edge and be the proper height for the displacer cylinder.
If the plaster of Paris does not prove to be heat resistant enough, I do have fire clay, and also Satanite as alternatives, though they are much less insulative.
tom osselton:
I’m wondering if you could use a glow plug for a deisel
vtsteam:
I don't know. Tom. To be honest, I've never actually seen one. Just glow plugs for small model airplane engines. I think they were platinum, and not meant for continuous current.
tom osselton:
I realize they aren’t for continuous use but they could be pulsed using a arduino or a thermocouple.
Bluechip:
Low voltage immersion (?) heaters are freely readily available ... like this:
https://www.ebay.co.uk/itm/325462059145?chn=ps&_ul=GB&mkevt=1&mkcid=28&google_free_listing_action=view_item&gQT=1
Whether it has any relevance only you can decide.
:scratch:
Dave
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