Heater Control

Discussion in 'Anything DIY Related' started by ANiMOSiTY, 12 Jun 2013.

  1. ANiMOSiTY

    ANiMOSiTY

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    Hope this is in the correct section :)

    Right, so I've built m own aquarium controller.
    It controls power to a heater which sits in the tank's sump.

    I've got the tank's ideal temperature set to 26 degrees C.

    My reef controller is set to activate the heater at 0.3 degrees under the ideal temp and then switches off the heater once the ideal temp is reached.
    It also keeps a log of the highest and lowest temps over the last 24 hours.

    I'm toggling the heater ON at 0.3 degrees lower than the ideal temp.
    It takes around an hour for the temperature to drop by 0.3 degrees and around an hour and a half to get back up to 26. So the heater is usually on for 90 minutes, then off for 60 minutes.

    My question is this...

    Would it be better to switch the heater on at 0.1 degrees under the ideal temp?
    Is there an ideal / efficient setting for heater toggle?
    Would it be safe to effectively switch the heater on and off every 20 minutes or so?
     
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  3. Normandp1

    Normandp1

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    Do you have a pic? And was it difficult to make it.
     
  4. dallasg

    dallasg Moderator MASA Contributor

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    mine allows a degree drop then kicks in... where is your tank situated with such temp swings?
     
  5. ANiMOSiTY

    ANiMOSiTY Thread Starter

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    Is 0.3 degrees per hour quite a high swing?
    It's in the lounge area, away from windows.

    The swings are only this much in winter.
     
  6. lIghty

    lIghty

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    Hi Animosity

    As for efficiency, it would make no difference. all you are doing it effectively replacing the heat lost from the tank, but it would effect the temperature "stability" of the water. Having a lower hysteresis (difference between the on and off) would be better as it reduces the temp fluctuation, which would probably be better for the live stock. IMO 0.3 deg is fine, and is what I use to run. Just to give you an idea, most chiller run with a 1 deg hysteresis. From a controller design point of view, if the hysteresis to so small causing the heater to kick in and out to often, it could reduce the life expectancy of the switch gear or relay.

    hope that helps!
     
  7. ANiMOSiTY

    ANiMOSiTY Thread Starter

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    Awesome, thanks, that's what I was looking for :)
    I suppose what I really need to know is.. for my heater, is a 0.3 degree hysteresis OK for longevity?

    It's an Eheim Jager.
     
  8. HOT SAUCE

    HOT SAUCE

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    dude please teach me
     
    Last edited: 13 Jun 2013
  9. ANiMOSiTY

    ANiMOSiTY Thread Starter

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    I'll do a thread in the DIY section with all the aquarium controller details :)
     
  10. HOT SAUCE

    HOT SAUCE

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    awesome. im keen for anything DIY not so much for saving money but just for the challenge and the fun
     
  11. lIghty

    lIghty

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    I can't see what not. Just make sure your temp sensor is upstream from the heater to you don't self induced oscilations, sensor picking up heat from heater and not actual avg water temp.

    are you using a relay or solid state?
     
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