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Posted by Power's Mechanical on February 3, 2007, 12:50 pm
On Feb 3, 10:56 am, gof...@gonefishin.net wrote:
>
>
>
> >On Feb 2, 4:32 pm, .p.jm@see_my_sig_for_address.com wrote:
> >> On 2 Feb 2007 13:13:32 -0800, krone...@yahoo.com wrote:
>
> >> >Greetings,
> >> >I grow hydroponic lettuce in a greenhouse in Missouri. The plants are
> >> >watered by a continuous stream of solution, which I also use to heat
> >> >and cool the plants instead of heating and cooling the entire
> >> >greenhouse.
> >> >As you probably realize, this still requires a lot of
> >> >electricty. What I was wondering, would it be effective to run the
> >> >solution underground (like a geosourse heat pump without an exchanger)
> >> >to aid in shedding some of the heat from the solution in the summer?
> >> >It is my
> >> >understanding, that around here, the ground stays a constant 60 F at
> >> >least four feet. Would it be effective to bury - say 300 feet at
> >> >4 feet deep to help chill the solution or possibly warm it in the
> >> >winter?
>
> >> Could be.
>
> >> The biggest issue is how well is the greenhouse insulated.
> >> After all, THAT is where you either gain or lose heat, not the plants
> >> themselves, nor the water itself. So, you need to do a standard heat
> >> gain/loss calc on your greenhouse, to see what your energy needs will
> >> be. THen see how much of a geo-field you need to handle it.
>
> >> >My biggest concerns are that since the temprature gradient is so
> >> >narrow that it may take a lot more buried pipe, and electricty to do
> >> >the extra pumping, and that it wouldn't be worth it. Any help anyone
> >> >could lend would be greatly appriciated.
>
> >> >Thanks,
> >> >Travis Kroner
>
> >> --
> >Insulated greenhouse. lmao!
>
> obviously you've never owned a greenhouse located in a northern
> climate.....typically its two layers of glazing seperated by a dead
> air space. Anything from double or triple paned glass to corrugated
> panels on the outside and a layer of vis-queen on the inside.
I dont have to own one and the ones Ive worked in have two (its a huge
operation) 350 hp boilers to heat the water for the in floor piping.
They are constructed with single layer wavy transluced plastic
panels. We service about a dozen greenhouses and they are all the
same way.
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