Hi Tom -
My roof vents don't leak, I think because they are too darn heavy to
have the wind blow them open. Have you thought of using a different
material (other than Lexan) for glazing on your roof vents? Mine are
double paned glass with an air space.
~Denise
Thomas Hillson wrote:
>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
>>
>>
>>
>>_______________________________________________
>>the OrchidGuide Digest (OGD)
>>[email protected]
>>http://orchidguide.com/mailman/listinfo/orchids_orchidguide.com
>>
>>
>
>
>_______________________________________________
>the OrchidGuide Digest (OGD)
>[email protected]
>http://orchidguide.com/mailman/listinfo/orchids_orchidguide.com
>
>
>
>
_______________________________________________
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