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Date: | Thu, 12 Nov 2020 23:11:26 -0500 |
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My Objectives:
-Test upgraded “all season” hive base to deal with extra condensation and provide better ergonomics
-Determine at what Tambient bee’s ectothermic (resting metabolism) heat become insufficient to keep the cluster from forming
-Determine impact of direct sunlight on insulated hives
-Determine relationship between hive R-Value and clustering behaviour and CDH*8 (Cluster Degree Hours)
-Determine thermal impact of slatted rack
-Estimate heat loss from bottom of cluster
Note: My goal is not to get 99% accurate answers but understand general triggers and relationships and calculate rough estimates.
Some early data trends on cold climate wintering.
-Insulated Hives internal T Low is driven by hive enclosure heat loss (Thermal Resistance A/RSI)
-Wooden Hive internal T Low is driven by T ambient as stated in many studies where the assumption is Ta = Ti
-Any heat generated off cluster is quickly lost in a wooden hive. Heat loss increases when spring brood rearing is initiated as Ti box average targets 32C (nest area ~35C) for any Tambient below 35C as no heat is retained by wood.
-Honey equivalent g/hr consumed based on estimated heat losses (A/RSI) / Water generated ml/hr
-Thermal Impact of Slatted Racks
-Some interesting cluster movements and temperature spikes (i.e. after very cold mornings and rapid warm up) - bees adjusting heat output (delayed feedback loop)?
I am still in the explore phase, charting data from different angles, calculating various ratios or values, identifying relationships.
I am not bound by any specific questions so I am free to explore and see where it takes me.
I am continuing to review many different thermoregulation models and studies. Most, to simplify the differential equations, assume symmetry, spherical clusters and Tambient equal Tinterior and the main driver for the metabolic rate calculation. Another interesting concept is "self-organized thermoregulation" where the clustering is driven by the actions of individual bees vs a central hive decision making mechanism. Bees react (move) to their local environment (Temperature adjacent to them) and a mix of triggering temperatures initiate different behaviours.
Always happy to get feedback or new ideas.
https://drive.google.com/file/d/1jCQh3VIcB8OFhL3Q_fzUnkOOtDr8zb39/view?usp=sharing
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