How best to insulate betwixt hot and cold in a composite boat

Discussion in 'Fiberglass and Composite Boat Building' started by massandspace, Nov 17, 2017.

  1. massandspace
    Joined: Sep 2017
    Posts: 33
    Likes: 0, Points: 6
    Location: Salt Chuck

    massandspace Junior Member

    The situation:

    I must run a 3” diameter hot air duct “near” an icebox in a new custom boat build.

    Boat is foam/glass/epoxy. Designing and building at present.

    Let’s say the distance betwixt the pipe carrying the hot air is about 8” away from the inside border of the icebox.

    What is the best way to PREVENT THE BTU’s from mixing up.

    Is it 2-part pour-in Polyurethane foam? Is it baffles of very thin plywood set in series perpindicular to the heat flow path? A combination of these, or something else?

    Bonus points: The hot air pipe, at 8” away from the icebox, will also be 8” away from the hull of the boat, which on the other side of that thin wall will have 49-51 degree F Puget Sound water rushing past at 9 knots. Heat suck on that side? Yes, foam and/or baffles there, of course, but center the pipe betwixt the refer and saltwater?

    Ideas welcome...
     
  2. kapnD
    Joined: Jan 2003
    Posts: 507
    Likes: 37, Points: 28, Legacy Rep: 40
    Location: hawaii, usa

    kapnD Senior Member

    Pipe insulation is not exactly a new concept.
    A google search will turn up many results.
     
  3. PAR
    Joined: Nov 2003
    Posts: 19,133
    Likes: 471, Points: 93, Legacy Rep: 3967
    Location: Eustis, FL

    PAR Yacht Designer/Builder

    You seem to have sufficient room to use conventional solutions, to the heat exchange concerns you have. Is there a reason you're thinking you need a different approuch?
     
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