Gabriel Leirbag wrote:IBut then the question comes of getting rid of water to make room for the hot water intake.
You will loose an amazing amount of water through transpiration/evaporation esp if you have plants in your grow bed over the winter. You'll want a CHIFT PIST set up (so you don't change the water level in the fish tank) you should have wiggle room for the water level in the sump tank.
BTW, trout wont last in the hoop house over the summer.
But then the question comes of getting rid of water to make room for the hot water intake.
You do not want to heat the water directly as a safety precaution, instead run a non-insulated pipe that is transporting heated water that is subcooled from an entirely different tank. You will need some electronics to control the mass flow rate of water in order to control the enthalpy or rate of heat exchange. It is harder to control the heat source than it is to control the flow of water. This is a thermodynamics solution which will require an active pump that adjusts according to temperature differences and I could probably build one out of Arduino that will not be too expensive. Currently there are no aquaponics solutions that do this which will be a project I will pick up in the future so keep around here for a bit and you may hopefully see a design in a thread .
The speed of the pump would also regulate the temperature if you pump water from the tank, past the rocket stove and back into the tank.
I guess there must be some kine of regulaters out there that can also regulate the speed of the pump?
Maybe also hook up a GSM system with a thermostat sending you a message when the temperature drops.. =o)
Aquaponics with rocket mass heater:
I believe that for larger scale operations using water circulation to heat growing beds has potential but I am not fixated on the system. There are some pros/cons I am going to have to further consider. Another design challenge is maintaining high levels of carbon dioxide inside the green houses as this does directly effect growth rates. Burning wood does generate carbon dioxide so there is a two fold benefit with heat.
There are additional design considerations I am looking into such as fully enclosed or even subterranean concepts. I have to do more math on the value of energy expenditure and upfront capital requirements, all these I have not done yet.
Amedean Messan wrote:Well, I have a concern in the possibility of sterilizing the water around the heat exchanger.
If you had a heat exchanger that actually had localized heat high enough to kill the bacteria there it would not really cause problems over all as long as the water temps were right. Remember sun light on the water kills bacteria. The nutrients the bacteria held would still be a food source for other organisms and the amount killed would not be significant.
While my experience is with tilapia because I lived in the tropics a few years, I think shifting the fish to what the environment supports would be easier than coaxing the environment. Having tilapia breeders in a 55 gal aquarium in the house over the winter and raising bass in the greenhouse would work easier. Introduce the tilapia babies in the main tank with bass when the water is warm. The will breed and produce food over the summer and as the water gets cold they will go into a death spiral for easy pickings for the bass.