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Re: Constructing a greenhouse

  • Subject: Re: [ferns] Constructing a greenhouse
  • From: Bob Needham <bneedham@cisco.com>
  • Date: Tue, 28 Sep 2004 07:35:51 -0700 (PDT)

After re-reading your post again more carefully, I have one additional idea.
If the air temerature is hotter outside than inside, you will need misters
at the ridgeline (on a different valve), as then, the airflow will reverse;
i.e. air will come in through the roof vents, be cooled by the ridge misters,
contract, and sink, flowing out through the ground-level vents.

Sorry. I teach Science, Physics & Math, but my "paying-attention" skills are 
low, just ask my wife! ;^>

> You need openable/closeable vents near the ground, and openable vents right
> up at the top of the ridgeline. The ridgeline vents should be LARGE. Make them
> all the way down the ridge on both sides, and easily openable (hand-crank or
> garage-door opener/motorized). They should reach ~25% from the ridge to the
> eaves. If motorized, they can be set up on a thermostat to open when the 
> temperature passes a certain point, and close again when it cools off. To
> help even more, put misters down just inside of the ground-level vents.
> The evaporation will cool the air, and natural passive convection will draw
> the too-warm air out the ridgeline vents. No fans needed...
>                  ---/\--- <-- Ridge vents
>                    /  \
>                   /    \
>                  /______\
>                 /|      |\
>                  |      |
>                  |  ___ |
>                  |  | | |
>                  |  | | |<-- Ground-level vents
> ---------------------------------------------------------------------
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