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#1
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Greenhouse inflation
I put a greenhouse up this summer and am confused about a point and was
wondering if anyone could answer this one for me. I currently inflate the greenhouse with air from inside the greenhouse but have been told I should be drawing air in from the outside. With drawing the air from the inside I am thinking that the bubble will be warmer and give me better insulation but I am concerned with the issue of water collecting in the bubble. With drawing air from the outside I am thinking that the air will be a lot colder and thus not so good for my orchids. Any advice would be greatly appreciated. Dave (Ontario, Canada) |
#2
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Greenhouse inflation
All the books say draw the air from the outside, every greenhouse I have
seen draws from the inside. The blowers sold for inflation are made to go on the inside and use inside air. I have never had a problem and all my greenhouse use inside air. If you are not having problems with water and things growing between the layers, I would not worry about it. Pat "David Jewell" wrote in message .. . I put a greenhouse up this summer and am confused about a point and was wondering if anyone could answer this one for me. I currently inflate the greenhouse with air from inside the greenhouse but have been told I should be drawing air in from the outside. With drawing the air from the inside I am thinking that the bubble will be warmer and give me better insulation but I am concerned with the issue of water collecting in the bubble. With drawing air from the outside I am thinking that the air will be a lot colder and thus not so good for my orchids. Any advice would be greatly appreciated. Dave (Ontario, Canada) |
#3
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Greenhouse inflation
Pat thanks for the response, can I ask where you are from (aka do you have
the nasty cold freezie winter) I have had some water accumulate near the ground in the bubble and thats what inspired my question. Thanks "Pat Brennan" wrote in message ... All the books say draw the air from the outside, every greenhouse I have seen draws from the inside. The blowers sold for inflation are made to go on the inside and use inside air. I have never had a problem and all my greenhouse use inside air. If you are not having problems with water and things growing between the layers, I would not worry about it. Pat "David Jewell" wrote in message .. . I put a greenhouse up this summer and am confused about a point and was wondering if anyone could answer this one for me. I currently inflate the greenhouse with air from inside the greenhouse but have been told I should be drawing air in from the outside. With drawing the air from the inside I am thinking that the bubble will be warmer and give me better insulation but I am concerned with the issue of water collecting in the bubble. With drawing air from the outside I am thinking that the air will be a lot colder and thus not so good for my orchids. Any advice would be greatly appreciated. Dave (Ontario, Canada) |
#4
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Greenhouse inflation
I am in Michigan (Southern Part) and use inside air. I have some water
accumulation during the fall and spring, but when the winter comes around, much less. I get some ice that forms at the base of the greenhouse between the layers of the plastic. I have used outside air, and gotten exactly the same issue, and in the summer had as much as 6 inches of water between the layers of plastic, which caused me to add a drainage hose to each side of the greenhouse (It can get very humid here). I went back to inside air after 2 years of experimenting with outside. My reasons are simple: 1) Inside air means that I know the humidity of the air between the plastic 2) I know what might leak back into the greenhouse from a cut in the plastic 3) I know what insects might get in from the air 4) When I get heavy snow, I can turn up the heat early and get the snow to slide off the plastic, rather than have to let it sag to the inner plastic to get warm enough to slide off 5) In an ice storm the air is warm enough between the two layers to keep most of the ice from sticking, so it slides down and does not cut up my plastic as it shatters in the wind Doug In article , "David Jewell" wrote: Pat thanks for the response, can I ask where you are from (aka do you have the nasty cold freezie winter) I have had some water accumulate near the ground in the bubble and thats what inspired my question. Thanks "Pat Brennan" wrote in message ... All the books say draw the air from the outside, every greenhouse I have seen draws from the inside. The blowers sold for inflation are made to go on the inside and use inside air. I have never had a problem and all my greenhouse use inside air. If you are not having problems with water and things growing between the layers, I would not worry about it. Pat "David Jewell" wrote in message .. . I put a greenhouse up this summer and am confused about a point and was wondering if anyone could answer this one for me. I currently inflate the greenhouse with air from inside the greenhouse but have been told I should be drawing air in from the outside. With drawing the air from the inside I am thinking that the bubble will be warmer and give me better insulation but I am concerned with the issue of water collecting in the bubble. With drawing air from the outside I am thinking that the air will be a lot colder and thus not so good for my orchids. Any advice would be greatly appreciated. Dave (Ontario, Canada) |
#5
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Greenhouse inflation
Dave,
The ideal is to have a totally-sealed, "dead" air space, as that is the best insulation. Obviously we cannot do that, so the blower maintains the pressure while the film and its seams leak ever-so-little. There should be so little flow, that the source of the air makes little-to-no difference as to the temperature in between. it will be determined by the inside- and outside conditions, not the source of the air used for pressurization. Outside air is preferred because it is drier than the moist air from the GH, and that has two implications. One, dry air, being less dense, will be a better insulator, and secondly, if you use the moist, interior air supply, you will get more condensation in between the layers of plastic film, and the accumulated water will actually reduce the dead air volume and the accompanying insulation. Like Pat, most of the inflation systems I've ever seen were interior, but in the last poly film GH I had, I tried the external blower - protecting it in a plastic, bottomless "box" - and was quite pleased. There was no temperature problem, and MUCH less liquid in between the layers. (In the previous GH, it built up as much as 9" deep!) -- Ray Barkalow - First Rays Orchids - www.firstrays.com Plants, Supplies, Artwork, Books and Lots of Free Info! "David Jewell" wrote in message .. . I put a greenhouse up this summer and am confused about a point and was wondering if anyone could answer this one for me. I currently inflate the greenhouse with air from inside the greenhouse but have been told I should be drawing air in from the outside. With drawing the air from the inside I am thinking that the bubble will be warmer and give me better insulation but I am concerned with the issue of water collecting in the bubble. With drawing air from the outside I am thinking that the air will be a lot colder and thus not so good for my orchids. Any advice would be greatly appreciated. Dave (Ontario, Canada) |
#6
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Greenhouse inflation
David Jewell wrote:
I put a greenhouse up this summer and am confused about a point and was wondering if anyone could answer this one for me. I currently inflate the greenhouse with air from inside the greenhouse but have been told I should be drawing air in from the outside. With drawing the air from the inside I am thinking that the bubble will be warmer and give me better insulation but I am concerned with the issue of water collecting in the bubble. With drawing air from the outside I am thinking that the air will be a lot colder and thus not so good for my orchids. Any advice would be greatly appreciated. Dave (Ontario, Canada) I don't have a greenhouse but I recently had a discussion with someone who was having a problem with moisture and algae growth between the layers. He was using inside air. In the winter, the warm inside air will hold a lot more moisture than the cold outside air. That moisture can condense when it is next to the cold outer plastic. If your system is extremely air tight, you can use outside air with almost no loss warmth because you are not actually pumping much air in. You are only applying pressure to the air that is always in there. If your system is leaky and you actually are pushing in a lot of air, then inside air may be better. The air circulation from the air actually moving through the layers will help keep moisture from building up. Obviously, either way will work. Steve |
#7
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Greenhouse inflation
Nothing is better than an answer that says there is really no hard and fast
right answer. Keep the answers coming. I will let you know when and if I tear a hole through the outside to pump it in. Dave "Steve" wrote in message ... David Jewell wrote: I put a greenhouse up this summer and am confused about a point and was wondering if anyone could answer this one for me. I currently inflate the greenhouse with air from inside the greenhouse but have been told I should be drawing air in from the outside. With drawing the air from the inside I am thinking that the bubble will be warmer and give me better insulation but I am concerned with the issue of water collecting in the bubble. With drawing air from the outside I am thinking that the air will be a lot colder and thus not so good for my orchids. Any advice would be greatly appreciated. Dave (Ontario, Canada) I don't have a greenhouse but I recently had a discussion with someone who was having a problem with moisture and algae growth between the layers. He was using inside air. In the winter, the warm inside air will hold a lot more moisture than the cold outside air. That moisture can condense when it is next to the cold outer plastic. If your system is extremely air tight, you can use outside air with almost no loss warmth because you are not actually pumping much air in. You are only applying pressure to the air that is always in there. If your system is leaky and you actually are pushing in a lot of air, then inside air may be better. The air circulation from the air actually moving through the layers will help keep moisture from building up. Obviously, either way will work. Steve |
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