Thermal insulation of honeycombs

15.1.2015

When considering the thermal insulation of bee hives, we also have to consider the honeycomb construction with its air layers in between. These layers themselves act as thermal insulation. The more honeycombs between the bee cluster and the side wall, the higher the insulation. I.e. with regard to the side thermal insulation, the broad constructions of the modern hives are quite helpful.

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Straw bee hive with frames

apiary of the abbey beekeeping

Almost 100 years ago, straw hives with frames were already used for beekeeping. The hive has a wooden bottom, the entrance hole is only a small slit, the side walls are made of straw and the lid is a double-walled wooden construction with straw filling. In these hives there were no problems with mould and … Read moreStraw bee hive with frames

Calibration of humidity sensor DHT21

Utensiilien für die Kalibrierung

The DHT21 sensors used in the “Beelogger” are capacitive sensors used in modern electronic absorption hygrometers. This type of sensor uses a hygroscopic layer as dielectric between the two electrodes of a capacitor. The absorption of moisture in the dielectric changes its properties and so the electrical capacity of the sensor.

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Orientation of the entrances

In “The nest of the honeybee” in 1976, Tom Seeley describes a random alignment of the entrances in tree cavities inhabited by bees. Unfortunately, he does not give data on the alignment of uninhabited tree cavities in the region. It is therefore not possible to verify whether the bees prefer a certain direction for the entrances of their tree cavities or not.

Alignment of the cave openings
Orientation of entrances in “The nest of the honeybee”, 1976

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Physical properties of propolis

Wood with propolis layer

The antiseptic function of propolis is generally known. This property slows down the development and spread of pathogenic germs in hives and tree hollows. However, propolis also fights condensation and mold in a different way, which is probably unknown to beekeepers. It is a simple physical effect: In the propolis layer there is no capillary condensation, propolis is not hygroscopic.

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Data logger for the recording of climate data

Beelogger Solar SD

The first self-made data loggers (beelogger solar SD) according to the instructions of Thorsten Gurzan (www.beelogger.de) go into operation!

  • Waterproof housing, suitable for outdoor use, with screw-on device
    Each measuring station contains 3 combined sensors for humidity and temperature, with an accuracy of ±0.5°C or ±3%.
  • Equipped with a real-time clock, i. e. the data is written with a time stamp. This real-time clock also records the temperature in the housing.

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News on the Diffusion Lid, October 2017

bee hive with D-lid

The Diffusion lid works, but not as well as calculated:
The calculations for the diffusion lid are basing on approved calculation methods of building physics. The difference in the temperature, the thickness and the type of the material are decisive for the amount of water vapor diffusion.

Read moreNews on the Diffusion Lid, October 2017

Grooming Time

groomed varroa

You can see the grooming several times a day in my video recordings. Sometimes “Grooming Bees” appear and work off one bee after the other. However, grooming is usually started without planning. Shaking and cleaning movements of a bee (that wants to free itself from pollen/parasites) are apparently the trigger. Under Videos I have already published both versions.

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