Homemade Pellet Water Heater

homemade Posted By homemade, Jul 29, 2012 at 10:01 AM

  1. mepellet

    mepellet
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    A btu is a btu yes.

    The definition is something like..... the amount of energy required to increase the temperature of 1 pound of water by 1 deg F.
     
  2. mepellet

    mepellet
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    I am by no means an expert and don't claim to be but not only do I enjoy looking and thinking about these types of things but I also enjoy being able to help a couple of fellow forum members out. Especially since I have learned so much from here about pellet stoves. Looking into upgrading our old wood stove in the next few years so I am sure I will be turning to the wood burning forum then.
     
  3. woodgeek

    woodgeek
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    Um, if the material leaving is char (carbon) and not ash, then you have incomplete combustion and less than 8000 BTU/dry pound input. Math is easy and measuring is hard. Measurement error? Are you measuring the water flow volumetrically at the same time the unit is running, or relying on a flow meter (which are notoriously inaccurate)??
     
  4. mepellet

    mepellet
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    Very good points. The weight of a gallon of water does depend on temperature. I commonly use 8.34 pounds per gallon which I believe is at 60 deg. F.

    When the OP says an increase of 45 degrees I assume he means that water coming into the heating device is 45 degrees lower than the water coming out. So he either must be dumping 1 gpm out of the system or losing the 45 deg F out in a heat dump zone. True about the electrical requirements. I was only looking at the combustion efficiency.


    I think you need to consider the 51,000 lbs when calculating btuh. You need to get the gallons per MINUTE to gallons per HOUR. Otherwise your units would be off. Yes you can say 1hp equals 2550 (1hp = 750w & 1w = 3.4 btus) but most of that energy goes to moving the water. It's like when you use a large fan in an air handling unit. You don't count 100% of the fan's hp in system heat gain. Only a very small fraction...

    Very good point. This will be a hard item to put a real number on.

    Modern 95% efficient boilers can be had...so efficiency of this level is not out of the question, but they need a clean burn and actually condense the water out of the flue gas to recover that extra bit of steam energy. Of course, heat pump water heaters can approach a 'coefficient of performance' (COP) of 2.5 or better...which is 2.5 btu out for 1 in, or an apparent efficiency of 250%.

     
  5. mepellet

    mepellet
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    How true it is.
     
  6. homemade

    homemade
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    5 qt ice cream pail in a minute 15 seconds
    water is flow out of well at 57 degrees and rising 45 degrees and dumping on ground don't have city water as you see
     
  7. woodgeek

    woodgeek
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    can't argue with a well-calibrated pail.
     
  8. Corey

    Corey
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    Just don't tell me the temperature was measured with a bungee cord, a piece of bailing wire and two twigs from a willow tree! :)
     
  9. homemade

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    willow tree with a crook in it na that is how you find water
     
  10. homemade

    homemade
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    at least that is how my uncle thought he could find it, water witching, impressive to watch
     
  11. homemade

    homemade
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    na a ranco temp controller
     
  12. homemade

    homemade
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  13. homemade

    homemade
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    then i find out water weight per gal changes at different temps for instance
    68 water =8.33 lbs
    104 water =8.28 lbs
    140 water = 8.2 1lbs
    176 water=8.14 lbs
     
  14. mepellet

    mepellet
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    Yes, I alluded to this in a previous post above...
     
  15. homemade

    homemade
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    well I just signed letter for a patent attorney wish me luck
     
  16. Realstone

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    Keep us posted (at least as far as is prudent regarding public disclosure that is)
     
  17. maple1

    maple1
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    Sounds like you need a gasifying boiler. ==c
     
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  18. homemade

    homemade
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    Jul 28, 2012
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    still looking for someone to help perfect this thing and maybe one day get it insulated, right now I been running it for last three weeks or so, whenever the cold started and using about 2 five gal pails a day heating 2 car garage and old farm house
     
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