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Date: | Fri, 11 Dec 2020 13:47:31 -0500 |
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<<For this discussion to be a bit more scientific, we would need to compare
the exact same setup with a top vent vs no top vent.
Without a comparison, or a control it's not really science, but just
interesting observational data.>>
That will always be the challenge with self funded citizen science (time and $$). I am sharing observations and ideas on possible mechanisms driving some of the issues we may encounter. This is a discussion group. Again it is not about being right or wrong, just asking questions.
Here is a control chart for the same period as the previous post showing the DP cross overs. I could get into the mixing of gases of different RH% using psychometric charts but that would likely make it to complicated with the level of data I currently have and the audience. The data however, does allow me to make educated guess for these and past observations. If I inspire a future master or phd student to further this type of research then I would have accomplished my mission. If others see something I don't or get a "Aha" moment, then mission accomplished!!
In insulated hives, on very cold days, the hot air coming out of that top entrance is a thermo jet (-40C (outside) vs 25C (inside)), if the lower entrance is not significantly reduced. When the lower entrance is small, and the bees have a large enough population, they are able to regulate the air flow through that top entrance (using their bodies, propolis, or via ice buildup) to constrict the size of that hole.
Are they managing the internal heat, as well as purposefully controlling the mixture of fresh air to the internal air. From the control chart you can clearly see that the empty control hive have 10 to 20% lower RH from the active hive. In the live hive you can observe a RH lag between in and out ~5hrs for the area marked with the vertical dashed red line. This area is also the one highlighted in the previous chart as C as a possible condensation pts.
As the cluster seems to be above the Lower RH reading, it is likely fairly representative of the lower box RH% (Dew Point is fixed but T is variable
By the way, I will never be able to test a non-insulated hive in my location, I therefore have to rely on other people's data.
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