Mark,
Unfortunately, I tried moving the air to the floor, but the times I
tried it, my entire greenhouse went over 90 degrees, way to hot for
my cool growing species that I like to keep no more than 60 to 70
this time of year. If I did not have a varied collection of orchids
this would be easier, but I have over 250 genera and lots of hybrids
in my collection. Most of them are Paph species and Paph hybrids, I
also have a lot of Pluerothallids, and a heterogeneous collection of
other things. I love the unusual, that is part of why I like orchids.
I like the idea of more roof vents, but I want to work on a way to
shield them from the north and west winds we get here as I found them
to drive the cold air under roof vents in the winter. I had some roof
vents on my old greenhouse, but I did not replace them when I put new
lexan the greenhouse two years ago as I was looking to save heat and
keep the greenhouse warmer. The problems I have found with my
greenhouse is you want to keep the heat in at times and you want to
get rid of it other and it is really hard to do both well. Any one
have any roof vents with a baffle or other protection around it or
any ideas on how to seal a vent better than the normal ones that just
lay on top of the greenhouse.
I am enjoying this discussion, I hope we can come up with some good
ideas that will help more people.
thanks,
Tom
On Mar 22, 2007, at 12:58 PM, [EMAIL PROTECTED] wrote:
> Thomas,
>
> Another tactic for "I am both trying to keep the cold out and the very
> expensive heat generated by my furnace in the greenhouse" on cold days
> ("A week ago it was still over 100 in my greenhouse but the outside
> temperature was 10 degrees.") is to have several fans at the top of
> your
> green house that blow down. This blows the hot air down to mix with
> colder sitting near the floor. Warming up the cooler air or
> cooling the
> hot air depending on how you want to look at it. The effect is a
> closer
> temperature more homogeneous from top to bottom in the greenhouse.
> This
> tactic also decreases the amount of time your heater runs if the
> thermostat is located closer to the floor then the top of your
> greenhouse. I do this in my own greenhouse.
> I can't add anything to the ventilating to the outside suggestions you
> have gotten expect it sounds like you either need more vent fans, a
> larger vent fan, some passive roof vents, or a combination to tackle
> your problem of " They barely keep my greenhouse temperature from
> going
> over 110 at 8 feet." If it is possible to install in your greenhouse I
> would go with adding roof vents that open and close with changes in
> temperature that Denise Nash talked about, more energy efficient.
>
> "If you have anything you are using or any ideas let me know, and lets
> keep this discussion online, I would like to see if we can generate
> something useful for the archives." I applaud you for saying this.
> It allows everyone to learn at the time of discussion, and into the
> future. Discussions can lead to new ideas. If Ed Merkle and Denise
> Nash
> had only sent you private e-mails of their excellent posts, we
> would all
> be the poorer and the OGD would be relegated to news posts and
> squabbles. Nothing wrong with the news posts mind you, but discussion
> is where the OGD gets interesting.
>
> Mark Sullivan
>
>
>
> _______________________________________________
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