solar hot water heating -HD Aquaponics – Ep.19 – Solar hot water heater, floating raft dwc lettuce, tilapia

February 9, 2012 – 6:24 am

** We have installed solar heating of water in fish tanks to help regulate the water temperature for tilapia. Website: Music by Chris Wells – I burn

** The pump does not need to be the 100 watt version. There are lower power pumps on the market. A DC pump would work too well. It is 50 gallons. Pondmaster Magnetic drive the water pump. Video Rating: 4 / 5

Share and Enjoy:
  • Twitter
  • Print
  • Facebook
  • RSS
  • Digg
  • Sphinn
  • Mixx
  • Google Bookmarks
  • Blogplay
  • Yahoo! Bookmarks
  • PDF
  • Tumblr
  • Technorati
  • Suggest to Techmeme via Twitter
  • StumbleUpon

  1. 49 Responses to “solar hot water heating -HD Aquaponics – Ep.19 – Solar hot water heater, floating raft dwc lettuce, tilapia”

  2. @dontlikenumbers.. i have had copper in my aquaponics system for a while now.. it doesnt affect the fish at all as far as i can tell.. i wouldnt put it directly in the tank itself but i do use it to heat the tank water using a rocket mass heater connected to a pump in the fish tank.. any credible research on your claim? just wondering, love to read it if there is.

    By zilla4you on Feb 9, 2012

  3. also if you place the air pumps in the greenhouse they will pull warmer air to put through the totes.. cold air = cold water

    By zilla4you on Feb 9, 2012

  4. look into a rocket mass heater.. run copper piping inside and pump ur fish tank water through it.. i am heating water 5 degrees warmer than the water in the 275 tote and it raises about 5 degrees an hour.. once ur to temp you can use tank heaters over night to maintain temp.

    By zilla4you on Feb 9, 2012

  5. Do NOT use copper in your system! It is toxic to fish. And make sure any plastic you use is food grade. What poisons them can poison you.

    By dontlikenumbers on Feb 9, 2012

  6. Those peppers look amazing. I’ve got a bell pepper growing in a Topsy Turvy. Growing good I must say, but underperforming. It’s probably 3 times the size of yours, but has only set on two peppers so far. Darn lazy plant…

    By tdbt3c on Feb 9, 2012

  7. @edpozek I made something similar to heat my house water using flexable copper bubing and a $20 “solar” controller from harbor freight. The system easily heats all the hot water we (3 of us) can use and then some.

    By myclem6674 on Feb 9, 2012

  8. Where are you located to have water so cold? I am in Montana and had a similar problem, so instead of Tilapia which like warm water, I am using rainbow trout. My current water temp is 40 and has been down to 33. The trout get sluggish when it is in the low 30’s but survive. They are much more lively this week in the 40’s temps

    By ekampel on Feb 9, 2012

  9. If the system is indoors with no flying insects, bees, flys, etc do you have to hand pollinate all the plants?

    By joeshittheragman42 on Feb 9, 2012

  10. use compost to warm your tanks, if you study it out it will work in the winter.

    By paulluna45 on Feb 9, 2012

  11. Try using copper pipe instead of PVC for your solar panel. You also need to be able to insulate the panel so it doesn’t cool the water. You also might want to consider putting the panel inside the greenhouse.

    By JWayneCox on Feb 9, 2012

  12. Why not install a clear top on the tanks and put a mirrored funnel down to the tops just like a solar oven?

    By TheHossUSMC on Feb 9, 2012

  13. @grandmastermicochero The water heater actually melted over the summer so it’s not doing anything other than giving cover to my aerator. We’re not too sure how we’re going to heat the tanks in the summer.

    By edpozek on Feb 9, 2012

  14. how can you regulate the temp of the water once it enters the tilapia tank so you wont be raising the temp too high??

    By grandmastermicochero on Feb 9, 2012

  15. @tgvas hey this is andrew under a different account, and in the winter they will have an opposite effect and cool the water down more.

    By PostPetroleumPrepper on Feb 9, 2012

  16. @andrewbentley83 Could you use Wirsbo hePEX tubing used for home heating, they may not break when they freeze?

    By tgvas on Feb 9, 2012

  17. Could you share what water temps. youre getting out of the Collector ? Also, Pex Tubing for a Collector will hold up much better than PVC in the long run. Im building a Collector out of 300′ of 3/4″ Pex Tubing right now in an enclosed Wood Box which will thermosyphon into my Water Heater Tank (hopefully) , otherwise ill use a 12 vdc pump for circulation. Any problem with expansion of the PVC yet ? Give us the outlet temps please. Thanks.

    By DaveTheyCallme on Feb 9, 2012

  18. @toppersailor96 Yeah, that’s the plan at the end of the summer.

    By edpozek on Feb 9, 2012

  19. build an insulated shed around both tanks and if need be install a heater into the insulated shed

    By toppersailor96 on Feb 9, 2012

  20. @andrewbentley83 Yeah we have already removed the heat exchange due to the intense heat that ended up melting the pipe inside. We’re working on other options.

    By edpozek on Feb 9, 2012

  21. I used to install real panels and to shorten it up, this will not work in the winter at all in fact the smaller pipes will freeze and break you must drain the system each winter even in cali/Florida etc.

    By andrewbentley83 on Feb 9, 2012

  22. @edpozek Later I noticed your system is not pressurized, I would try it just the way it is and see how it works. Pulling all if it out seems a waste since there is NO pressure on the line. Just see how long it lasts, it make not have any problems for years. If it springs a leak later on, fix it then. We always had people plumb a water heater with PVC and then complained later that it leaks, usually near the water heater itself due to the heat and the expansion of the hot water.

    By KayakFisher01 on Feb 9, 2012

  23. @TheArmagarden Honestly, I don’t know. I will have to play with the flow to find the best speed to run through the collector. I will be keeping you guys updated on the progress or problems. 

    By edpozek on Feb 9, 2012

  24. @KayakFisher01 Yeah, I see that the max temp for PVC is 140 degrees, I know I’ll be going above that so I guess I will be replacing parts as needed. Thanks for the heads up.

    By edpozek on Feb 9, 2012

  25. @SpeedGimp Yeah I was thinking about those foam covers after reading your comment. I will pick some up next time I’m in town.

    By edpozek on Feb 9, 2012

  26. @SpeedGimp Silly me; I just realized something. You probably already know this, but they make slip-on foam rubber insulation sleeves for applications like this.

    By SpeedGimp on Feb 9, 2012

  27. I don’t know if this comment has already been made but how much hotter would the water be if the hose were covered with something clear and housed in something insulated? Another thing to consider is the winding of the hose. It’s hard to explain so I’ll have to say that the center of it would be like an ‘S’ so that both either end can go to the top or bottom of the ‘box’ it’s in.

    By Sutoraida1975 on Feb 9, 2012

  28. @chillydickie I was thinking that also. Maybe a longer hose coupled with a reflective surface, and a slower solar pump that works on a timer, so more water sits in hotter coils for at least a few minutes before it moves. Solar water heaters can work, they’re just not as fast or portable. Solar systems in general seem to need backups… Rout the coil water into a conventional water heater that won’t come on until well after dark.

    By BooGooNFlowoo4Evoo on Feb 9, 2012

  29. Sorry if I came across as rude, not intended. :)

    By superspeeder on Feb 9, 2012

  30. @superspeeder I will repeat, I am TOTALLY in support of these videos and the thought provoking messages they bring. What I don’t support is internet garbage that gets in the way of facts. It is totally practical to use solar to heat a swimming pool! Peole do it all the time, and more of those who don’t SHOULD.

    By superspeeder on Feb 9, 2012

  31. @DJMC5ive You said, and I quote: “a 55 watt pump does not add 55 watts of heat!”, and before that: “A 100 Watt pump that output 100 Watts of heat would be producing no mechanical function.” You were stating these as facts, not questions.

    I have indeed helped; I have pointed out to others that your comments are not factual. If I kept one person from taking your thoughts as facts, well, it was worth it.

    By superspeeder on Feb 9, 2012

  32. @superspeeder and, I’m sorry I didn’t think of the fact that the energy from motion would be transferred to heat. You didn’t have to be so rude man.

    By DJMC5ive on Feb 9, 2012

  33. I’m thinking if you ran a length of black hose on some blacktop driveway or roof you would see way more heat gain .
    and wouldn’t this work better if the hose wasn’t rolled up? (more surface area on the hose?)

    By phantomcharger on Feb 9, 2012

  34. @superspeeder I asked a question, and didn’t expect an asinine comment such as that. Have a good time being a jerk, superspeeder. You’ve helped in no way.

    By DJMC5ive on Feb 9, 2012

  35. @DJMC5ive While reading your comments I get a pretty solid feeling that you do not have the ability to prove yourself right or prove me wrong, as doing so would require a knowledge of physics. Go read up on it (this should take more than 5 minutes), re-read what I wrote, and then comment.

    Indeed, a 55 watt electric pump generates 55 watts of heat. EXACTLY 55 watts, not a watt more, and not a watt less. RESARCH this.

    By superspeeder on Feb 9, 2012

  36. @DJMC5ive or does it?

    By DJMC5ive on Feb 9, 2012

  37. @superspeeder yes, but a 55 watt pump does not add 55 watts of heat!

    By DJMC5ive on Feb 9, 2012

  38. @DJMC5ive Assume the pump has an efficiency of 50%; 1/2 its energy goes into heat and 1/2 goes into kinetic energy (water motion). As the moving water travels through the pipe coil and then slows down inside the tank due to friction, it is converting the other 1/2 of the energy into heat. A very small amount of that heat will be lost through the pipe coil to the ambient air, and the remainder will be transfered to the water, heating it.

    Stirring water with a spoon heats the water.

    By superspeeder on Feb 9, 2012

  39. as always, cool vid, and cute wife :)

    By pyrrhios on Feb 9, 2012

  40. @superspeeder A 100 Watt pump that output 100 Watts of heat would be producing no mechanical function. It wouldn’t be able to move, if it was 0% mechanical efficiency. I do understand what you are saying about the heat transfer though.

    By DJMC5ive on Feb 9, 2012

  41. uhhh, another experiment, another blimp? Do you have fake aircraft bothering you?

    By ella5024 on Feb 9, 2012

  42. I have been using black water hose for hot water n my shower for 3 years now…..its great n summer but winter kinda sukx

    By Khaos242Jeep on Feb 10, 2012

  43. try another additional length of hose coiled inside the barrel under water – it should boost you heat gain.

    By ometec on Feb 10, 2012

  44. Dan & Denise: your videos and experiments are awesome.. very informative and inspiring. I’m not sure if you’ve already done it but, could you please do the same setup only change the rubber piping for copper and use a fresnel lens? Oh and use a different kind of table as I don’t think Denise would be too pleased with a hole in the middle! :) You could also use a parabolic mirror with the coil of copper in the middle.

    By natenorrish on Feb 10, 2012

  45. great !

    best regards

    By SWINGREGORY on Feb 10, 2012

  46. Dear Friends, Hi
    Visit iss4u dot de and solkav dot eu to learn more. Heating water with electricity adds up to global warming. Using copper tubes only work in summer time, while rubber tube when frosted makes the water hot and extra energy by a heat pump is forwarded indoor for space heating. In regions with long winter you can use sport tiles made of rubber tubes to make ice skating ground. Two brothers from Iran in 1978 started this experiment in Austria and developed it and made in EU

    By Minuvash on Feb 10, 2012

  47. Hi, it may be the fact that the pump is too fast… at 1200 gph, thats about 1.3 litres per second i think… not enough time for the water to be heated up… probably try a slower flow rate…

    keep up the great videos.

    By chillydickie on Feb 10, 2012

  48. Your videos are great and the message VERY necessary in these times, but did you stop and calculate what percentage of the temperature increase came from the heat of the submerged pump operating? A 100 watt pump submerged will be putting 100 watts of heat into the water. This does not mean the experiment is a failure, it will just help better understand how much of the heat rise is due to solar collection.

    By superspeeder on Feb 10, 2012

  49. @sony01boy creeper

    By pacotnk on Feb 10, 2012

  50. @alpineicecompany Thank you for the info:-) Also the pump is a magnetic driven impeller so there is an additional barrier from the motor and not the traditional friction.

    By GREENPOWERSCIENCE on Feb 10, 2012

Post a Comment