- Oct 16, 2012
- Reaction score
- Fareham, Hampshire UK
- Hive Type
- Number of Hives
All the time ... however I spent several years measuring hive temperatures and comparing them to the ambient temperature and it is really only the lowest couple of inches above the mesh floor that is affected as soon as you get further up the hive the temp is what the bees choose it to be in well insulated hives with no holes above the colony ... but you know that anyway and you were doing the same as me all those years ago but in a much more scientific way with your temperature senders than my rudimentary ones ... I would agree that keepimg them draught free is a big plus... Bill Bielby hit that one back in 1972 ... page 42 Home Honey Production " the best way to overwinter bees is to keep them as draught free as possible" and "there is no such thing as too much insulation". Took a few years for the science to catch up but you got there eventually!yes it does make it colder at least from radiative losses. If the wire and the ground below are at outside temperature you are losing around 3W. Heat loss =F.Area.Sigma(T1^4-T0^4).
F is the factor based on how much the bees is visible to the cold surface. The area is area of the bees exposed. T1 is the temperature of the exposed bees, T0 is the colder surface ( the wire mesh and the ground below). Sigma is the Stephann-Boltzman constant.
Then you get air flow through the mesh caused by turbulences which can occur at even low external wind velocities less than 1mph . Did I ever mention its complicated?