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  • Heat Exchangers

    Does anyone have any suggestions as to make of heat exchanger one should consider for purchase? In the process of setting up a natural gas heating system on my pond. Several stainless steel exchangers out there that I've seen - Kerin's site, East Riding Koi site, and others but outside of btu output not much info on dimensions etc. Are they all similar or do any stand out as far as being more efficient? I'm assuming several members here have them on their ponds. Any advice would be greatly appreciated.
  • #2

    I have had two 350,000 BTU Heat exchangers made by Keeton in Fort Collins on my pond for years. (These are the people who developed Lymnozyme) They worked beautifully. No scientific data, but would do the same ones again, if I was building a pond again. www.keetonaqua.com

    Hope that helped.

    Best regards,

    Bob Winkler
    Best regards,

    Bob Winkler

    My opinions are my best interpretation of my experiences. They are not set in stone as I intend to always be a student of life. And Koi.

    sigpic

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    • #3

      How many BTU/hr are you looking at? How much space do you have for th exchanger?

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      • #4

        Thanks Bob - I'll check that out.
        Motown - not sure as of yet. Pond is 4500 gallons - 17 x 6 x 6.6 (average depth) - 7ft. 2 inches deep at the two bottom drains with air domes. I have insulated the walls with 2 1/2 inches of foamcore - 60 % of the pond is below ground and the remainder above but protected by deck and walls. The pond temperature this winter (Olympia, Washington) only dropped slightly over 2 degrees F in a 24 hour period during the worst weather we had - snow and ice. Generally only moves up or down about 1 degree F in a 24 hour period - even going into spring like weather. I have rigid covers with clear polycarbonate on the pond during late fall and winter (still on at the moment). Putting in a gas tankless water heating system for the heat source feeding a stainless heat exchanger - still figuring out exactly what I need and if I should go slightly bigger as far as the components are concerned. Suggestions (size,btu's)welcome.

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        • #5

          hi Dan,
          Do you have a picture of your pond that you could post? I was wondering what kind of construction it is with some of it being out of the ground.
          Ruth

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          • #6

            Ruth - here's a couple. You really can't see the portion above ground as it is covered by deck. From deck level to ground is approximately 3 ft. The remaining 4 ft. is in the ground. Basically you have a 3 ft. crawlspace under the deck in the picture. Hope that helps.

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            • #7

              Ruth - With covers on during the winter.

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              • #8

                Hi Dan,
                Thanks for posting the pictures. I always like to see people's ponds. Is it block construction or made out of wood? I was wondering about the part out of the ground.
                Also about the cover, it looks like it is made out of those panels (that are hard to find around here- poly carbonate I think?). Most of them I've seen are only 4 ft long. Is there a frame in the center that they butt up to or are they longer panels?
                I like your red fence.
                Ruth

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                • #9

                  more heat exchangers

                  http://www.aquaticeco.com/index.cfm/...ories/ssid/380


                  never enough sources for info here are a few more to look at.
                  " I'd rather a bottle in front of me than a frontal lobotomy "

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                  • #10

                    Ruth - sorry I didn't see your reply and questions until now. The whole construction is 2 x 6 treated walls on 1 foot centers with 1/2 inch treated plywood on both sides.. Individual wall sections - 8 of them - approximately 6 foot wide by 8 foot tall (2 on the ends and 3 on each side) are bolted to 6 x6 treated corner posts an 4 x6 treated posts down the sides sunk and cemented 2- 3 feet in ground below the bottom of pond. About 60 % of the walls are below ground level. The above ground portions are also tied into the deck frame structure for additional support. All walls have 2 inch foamcore insulation in them with 1/2 foamcore insulation on the inside plywood walls for the pre-formed liner to lay against - makes for a little give of softness under the liner. Bottom lined with carpet padding to cushion and protect liner. My friends thought I was building a battleship - little bit of overkill - but wanted it done right and extra sturdy to begin with.
                    The covers are 2 x 2 primed and painted wood frames with 4 x 8 sheets of clear polycorbonate cut to fit and screwed on with galvanized screws with rubber cushions. Got the poly carbonate panels at Lowe's - I think in the $16 - $20 a sheet range - can't remember. There are 4 covers shown in the snow photo which are approximately 5 ft. by 8 ft in size butted up to each other. The frames themselves support the panel - they do not sit on a support in the middle. The only thing I did was to use a wide push broom to pull off any heavy snowfall so it would not put weighted pressure on the panels. Only had to do that twice a couple of times each day to keep any heavy snow from accumulating. Other snowfall was light enough I didn't worry about it. With the pond being 16 x 6 on the surface that allows for the cover sections (total of 4 sections equal 20 x 8 feet) to overhang and sit on the finish trim on the top of the pond so water runs off onto the deck and not into the pond. I simply open and prop up one panel if I want access to the pond to check on the fish etc. Pond temperature fluctuations have generally been about 1 degree F in a 24 hour period and no more than slightly over 2 degrees in 24 hours with extended periods of cold with snow and ice. I'm very pleased with both the panels and insulation.
                    The red Japanese rail I designed for my wife and let me tell you that took forever to assemble as I glued and screwed every joint. One of those projects you think will only take a day and turns into much more because of the detail. Well worth it though. Hope this helps explain and answer your questions.
                    Mike - thanks for the info!
                    Anyone out there using the heat exchangers shown on Kerin's site or the one's from AquaEcosystems - look like the same ones to me. If so how do they perform? Thanks

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                    • #11

                      Ruth - 65 degrees out today in Olympia, Washington. Thought I would snap a couple photos for you. First photo with panels down showing sunlight on them. Tends to help warm the water up quicker when it gets nice with all that sunlight going through them. Pond temperature currently 54.2 degrees F. By end of day will probably be close to 56 with all that warm light going through. Second photo with one of the four panels opened up to access the pond. Hey I think those guys think I'm going to feed them. Thought you might enjoy these.

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                      • #12

                        Hi Dan,
                        Thanks much . I always like to see pictures. Your fish certainly seem to be ready for the sunlight - saying feed me It was much colder here today.
                        I can see the panels better. It looks like to me that they are not the flat poly panels that are being used in commercial greenhouses now, but an updated (clear) version of the older opaque green panels that are curved up and down. Am I seeing it correctly or are they indeed flat on both sides with air space in between? I've seen the older (updated clear) type sheeting at Lowes but I have not seen the flat panel - if they are carrying it that would be nice! Anyway it looks like they have worked well for you.
                        Ruth

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                        • #13

                          Ruth - you are seeing them correctly. The panels are curved up and down. I find this design works well with all of rain we get in the northwest as it channels it off the covers and unto the surrounding decks as well as providing air spaces for breathing between the pond and outside air.

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