The aim of this study was to review research findings and information about chemical composition and application of bee drone brood homogenate for food purposes. As the world’s population grows, global warming and the impact of meat production on the ecosystem are increasingly being discussed. Various non-traditional sources of protein, such as insects and larvae, could replace traditional sources of meat protein in the future. Drone brood homogenate is obtained from honey bee drone larvae and is considered to be a very high value by-product of beekeeping. Scientific studies prove the prophylactic properties of drone brood homogenate to improve fertility and strengthen immunity against viral diseases. This product is rich in nutrients, amino acids, vitamins, minerals and hormones but a certain harvesting and processing technology is required to ensure that the product has a sufficient shelf life and an attractive appearance.

The aim of the work is to increase the efficiency of cyclone technology by using a separator plate. Cyclone technology is used not only in the processing of various agricultural products, but also in air purification from dust. Air flow trajectories and the movement of dust particles inside the cyclone unit were simulated and analyzed using Computational Fluid Dynamics (CFD) and particle study analyses. The separator plate was designed in certain sizes and placed inside the cyclone, thus increasing the efficiency of the cyclone. The angle of position of the separator plate significantly affected the obtained results. The experimental equipment was assembled together to test the simulation results. Wood ash was used to determine the efficiency of the cyclone. Studies have shown that the effect of the separator plate on increasing the efficiency of the experimental equipment is less than that shown in the simulations. Most of the experiments used ash particles that were greater than 20 μm, thus cyclone efficiency was 98.9 ± 0.05%. This confirms the compliance of CFD simulations with the physical model. More detailed research should be carried out in order to use the separator plate effectively for the filtration of very small dust particles.

Electric buses running on city routes have different thermal conditions than long-distance intercity buses. The main difference is the frequent stops every 0.5–1 minutes and the embarkation and disembarkation of passengers, which causes heat loss. On the other hand, such routes offer the possibility to recharge heating batteries with contactless or non-contact wireless charging systems during stops. In order not to reduce the driving distance of the bus by consuming energy from electric batteries for heating, one option is to use heating batteries. As the total duration of routes from one final destination to another varies from half an hour to an hour depending on the city, but the duration of parking at the end destination is 10–15 minutes, heating batteries must provide cabin heating for one full journey using fast charging while standing at the final stops. This is the main condition for choosing the energy capacity of heating batteries. In the research there was developed and in the article there is described a simulation model in MATLAB/Simulink, which allows modelling different heating power and temperature regimes by varying the bus cabin microclimate influencing factors, such as outside temperature, door opening duration, the heat emitted by passengers, etc. Recommendations are given for levelling the temperature in the cabin, which, according to the measurement data, is markedly uneven.

Nowadays, with the rapid development of robotics and automation, there is a need for more powerful, more compact data processing equipment that also emits more heat. Various electronics cooling solutions are already in use, others are in development. Each cooling solution has its advantages and disadvantages. Active cooling usually dissipates heat more efficiently, but passive cooling is more reliable, especially when the electrical system is exposed to aggressive environmental influences. The possibility of using graphene in the manufacture of electrical equipment components is widely studied. Graphene could significantly improve the efficiency of passive cooling because its thermal conductivity is much better than copper.

The research is devoted to the results of air flow and heat transfer simulation application in the design of compact electrical equipment with the aim of increasing the efficiency of the cooling system. The design of electrical equipment involves not only the creation of an ergonomic, attractive shape, but also to the solutions to overheating problems. Excessive heat is to be emitted to the environment, and for small size devices the necessity is the properly designed accelerated air flow through the system. In order to find out the high risk areas in the device, which are under the risk of substantial overheating due to inadequate air flow intensity, the simulation model of airflow and heat transfer processes for the particular device was developed in the Solidworks software. The experimental device with the axial fan used for air flow supply to the heated areas was made to evaluate the temperature and air flow velocity. Comparison of the experimental and simulation results showed that the simulated air flow speed is describing the real situation with the experimental flow measurements in the device with 91 % coincidence. Temperature measurements differed from the simulations only by 7 % in some areas, but the distribution pattern remained. Studies of the air flow trajectory and speed revealed the tendency of negative intercorrelation of the air flow rate and the surface temperature.