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Thread: Woodstove as evaporator

  1. #11
    Join Date
    Jan 2016
    Location
    MA
    Posts
    588

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    Quote Originally Posted by Daveg View Post
    The insulating properties of firebricks are:
    Thermal Conductivity 300°C : 0.2 W/m.°K
    Thermal Conductivity 750°C : 0.28 W/m.°K
    Thermal Conductivity 1000°C : 0.32 W/m.°K

    You could place your hand on the unheated side of one that is 3” thick even if the heated side were 500°C
    Its a question of relative insulating value. Any material will "insulate" you from a heat source, but nobody uses bricks to insulate their house. Typical batt insulations have thermal conductivities that are an order of magnitude lower than the ones you've reported for firebricks.
    60ish taps on buckets
    D&G Sportsman 18x63
    Turbo RB15 RO Bucket

  2. #12
    Join Date
    Sep 2020
    Location
    Corbeil, ON
    Posts
    171

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    In my barrel evaporator I added 1" thick insulation on the inside sides and back. I then installed brick against the insulation to protect it. The sides of the barrel stay cool for awhile but after some extended heating the sides start to get warm after the brick has soaked in the heat of the fire. It's certainly better than without the insulation barrier.
    2021 - Year one. 15 taps using 5/16" and drop tube into buckets. Homemade barrel evaporator with 2 steam trays. 4.7L syrup.
    2022. 32 taps. Added AUF.
    2023. 51 taps. Ditched the steam pans for an 18x22 flat pan.
    2024. 56 taps. Built a proper evaporator to fit the 18x22 flat pan and 1 steam pan.

  3. #13
    Join Date
    Jan 2020
    Location
    Connecticut
    Posts
    159

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    And what’s better to insulate under the bricks - ceramic blanket or sand? (Provided of course you are on the flat part where the sand will not fall down)
    2017 - 20ish taps on buckets, boiling outside in two baking pans
    2018 - 70+ taps, 14-buckets, 50+ on tubing, homemade arch from oil tank in my barn, 17 gal syrup
    2019 - same set up, 20 gal syrup
    2020 - less taps, short season, but RO kit was fantastic! 6 gal syrup and a maple cat!
    2021/22/23 - expanded into the neighbors yards! 50 taps on buckets and 40 taps on tubing

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