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Thread: Bringing down pond temperature with misting nozzles and fans

  1. #51
    Oyagoi yerrag's Avatar
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    Quote Originally Posted by Jeffkoi View Post
    btw, not sure if you are aware, there is a mathematical formula to calculate the theoretical minimum temperature achievable by evaporation. Google psychrometric calculator.

    for example given 35C temperature for atmosphere and 60% relative humidity, the lowest theoretical temperature achievable is 28C.

    Sounds like your results are pretty near the thoretical best.

    Jeff
    Thanks for sharing Jeff. Singapore is quite hot and humid. I thought we had it so bad here in Manila, and then I went to Singapore...:-)

  2. #52
    Oyagoi yerrag's Avatar
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    Quote Originally Posted by sacicu View Post
    I did misting for 2 months 2 years ago. I phases it out.

    Sent from my GT-I9505 using Tapatalk
    How did you do the misting? How fine was the mist? How much power is involved? Why did you stop it?

  3. #53
    Jumbo sacicu's Avatar
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    Quote Originally Posted by yerrag View Post
    How did you do the misting? How fine was the mist? How much power is involved? Why did you stop it?
    500 watts of power using a commercial fine high pressure misting machine with multiple adjustable fine to 10 microns nozzle spray surrounding the pond. It was enery draining noisy and work best only if relative humidity is lower than 40. Nozzles often got blocked too

    Sent from my GT-I9505 using Tapatalk

  4. #54
    Oyagoi yerrag's Avatar
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    Quote Originally Posted by sacicu View Post
    500 watts of power using a commercial fine high pressure misting machine with multiple adjustable fine to 10 microns nozzle spray surrounding the pond. It was enery draining noisy and work best only if relative humidity is lower than 40. Nozzles often got blocked too

    Sent from my GT-I9505 using Tapatalk
    Secretly, I hope you did something wrong and didn't realize it, and it caused you to call it quits. But seriously, you really did that? Is that a Cat pump? Where is it now?

  5. #55
    Oyagoi kingkong's Avatar
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    Take the mist out of the equation. Just blowing air with fans over the surface of the water will cool the body of water to a degree who knows. More liquid H2O will exchange to gas and is evaporated. As liquid turns into gas molecules it requires energy. The energy is heat and is blown away from pond surface with added air from blowers.

  6. #56
    Jumbo sacicu's Avatar
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    Quote Originally Posted by kingkong View Post
    Take the mist out of the equation. Just blowing air with fans over the surface of the water will cool the body of water to a degree who knows. More liquid H2O will exchange to gas and is evaporated. As liquid turns into gas molecules it requires energy. The energy is heat and is blown away from pond surface with added air from blowers.
    If the surface area in contact with blowing air is not big then cooling a big body of water will not be as effective as compared to breaking down water to droplets and cooling the droplets

    Sent from my GT-I9505 using Tapatalk

  7. #57
    Jumbo sacicu's Avatar
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    Quote Originally Posted by yerrag View Post
    Secretly, I hope you did something wrong and didn't realize it, and it caused you to call it quits. But seriously, you really did that? Is that a Cat pump? Where is it now?
    I imported the professional misting device from China. Wrote down the data that included ambient air it can produce, relative humidity and pond temperature. It is effective in lowering ambient air near the nozzle but translating it to lower water pond temperature is not as good as compared to other methods. It is not advisable to run the unit continuously because it uses a high pressure pump like a pressure washer pump. It is programmable to turn on and off at certain time interval depending on your choice. I think it could be useful in other purposes like in an orchid or bonsai setup.
    Quote Originally Posted by sacicu View Post
    If the surface area in contact with blowing air is not big then cooling a big body of water will not be as effective as compared to breaking down water to droplets and cooling the droplets

    Sent from my GT-I9505 using Tapatalk

    Sent from my GT-I9505 using Tapatalk

  8. #58
    Oyagoi yerrag's Avatar
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    Cons: nozzles plugging up, uses plenty of power, very noisy, ineffective at bringing pond water temperature down.

    Comments: 10 micron nozzle - how fine is the water filter you used? Noisy- how many decibels? Not effective- how far off from theoretical temperature drop, given ambient air temperature and humidity (ambient meaning the natural temperature and humidity)?

    I still have to review Nivek's posts to get a baseline to compare results. But I understand he was using larger nozzles, and using fans, and he was getting very good results. I'm just having trouble understanding the disparity in satisfaction ratings between you two. Maybe he got results that exceeded his expectations, and you got results that went under your expectations.

    Sent from my XT1068 using Tapatalk

  9. #59
    Oyagoi yerrag's Avatar
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    Quote Originally Posted by sacicu View Post
    If the surface area in contact with blowing air is not big then cooling a big body of water will not be as effective as compared to breaking down water to droplets and cooling the droplets

    Sent from my GT-I9505 using Tapatalk
    Right on. But the droplets are not being cooled. The droplets are evaporating and cooling the air.

  10. #60
    Tategoi
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    Quote Originally Posted by yerrag View Post
    Right on. But the droplets are not being cooled. The droplets are evaporating and cooling the air.
    It sounds like you folks over there have a serious issue, so I thought I would add some stuff at this later date!(Hoping people will come to this string for info!

    It takes 1 Btu/lb to remove 1 degree from a pound of water but 1 lb of water evaporated will give up 977 Btus of heat!

    A mister will allow more of the water to evaporate, but more of the cooled water will be removed by air flow! A course spray that allows more of the cooled water to return to the pond will be more effective!

    If you're interested, a psychometric chart can be located on linebut take a look at several because some will only give limited results! a psyc chart can be used to determine the amounts of water, humidity, dry and wet bulb temperature, air saturation of a pound of water!

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