|
HVAC Discussions - Heating, ventilation and air conditioning.
|
|
|
|
If you were Registered and logged in, you could reply and use other advanced thread options
|
Posted by gofish on February 3, 2007, 10:56 am
show/hide quoted text
>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.
|
|
Posted by Jeffrey Lebowski on February 3, 2007, 11:55 am
show/hide quoted text
> >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.
Very common is to use a double layer of uv resistant poly film, with a very
small fractional hp blower motor to keep the layers separated.
Hoping to finish adding hydronic mats for to provide 70 deg f bottom heat
into ours early this spring...water source heat pump using outside air,
electric water heater backup.
|
|
Posted by Power's Mechanical on February 3, 2007, 12:50 pm
On Feb 3, 10:56 am, gof...@gonefishin.net wrote:
show/hide quoted text
> >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.
|
| Similar Threads | Posted | | Re: geothermal exchange help | February 2, 2007, 10:38 pm |
| geothermal exchange help | February 2, 2007, 4:13 pm |
| KeepRite DC90 Heat Exchange ring popped | November 6, 2006, 4:54 pm |
| Geothermal and new vents | October 30, 2007, 8:38 am |
| Geothermal Operating Costs | September 8, 2006, 1:58 pm |
| GeoThermal unit in Ohio? | August 7, 2008, 11:08 am |
| geothermal runs constantly | November 24, 2008, 1:34 am |
| new Geothermal heating/AC considered | May 7, 2009, 2:07 pm |
| Geothermal system and sinkholes | May 13, 2009, 2:42 pm |
| Geothermal Water Pressure Problem | July 15, 2006, 1:50 pm |
|
|
|
Yahoo! 
Google 
Windows Live 
del.icio.us 
digg 
Netscape 
XML Sitemap
>> 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!