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Date: | Mon, 27 Feb 2023 23:41:24 -0500 |
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Just a note on screen bottom boards, when no top entrance is used, it's purpose is to ensure access to air if bottom entrance gets plugged/frozen and to drain any excess condensation out. It actually has minimal impact on "ventilation" as stated in the quoted paper. If a sub-arctic beekeeper can winter with it open all winter, it won't be an issue for most as long as it is protected from the wind and no top entrance is used.
The quoted paper was actually for a colony in a low ventilation scenario. The CO2 seems to coincide with all the micro CO2 generators (bees) being hive bound, with peaking levels at about 6am where temperatures would be the coldest outside (highest metabolic rate + the most bees around the sensors) with a slightly higher lower sensor level due to CO2 being heavier than air. My interpretation of the CO2 data is that most of the varying CO2 level is due to bees being inside at night and leaving to forage, and hive fanning during the day. When bees start returning to the hive (micro CO2 generators) the levels starts rising again and increases to its max when fanning stops or slows as outside temperatures drop.
It is a "thought" experiment (the previous calculator was to illustrate a point). One can't change that cold humid air when warmed will have a lower RH%. CO2 above atmospheric level is a function of the metabolic rate of the bees. This paper is for June and July under summer conditions which are drastically different than bees during the cooler months.
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