Research that we carried out in strategic fields, such as supply of fundamental goods which are important for normal human existance and successful work, are top priority in the world. Therefore rational utilization and efficient use of energy in connection with use of environmental acceptable processes and devices are in the forefront of every national programme of developed countries. New comprehensions as a result of our research in the fields of: - hydromechanics of ice slurry for transport of cooling energy - implementations of district cooling systems in existing district heating systems - introduction of trigeneration into integrated supply of energy - heat transfer in light construction elements with phase-change materials for storage of solar energy - ventilation and fire safety in road tunnels - efficient use of fossil fuels and wood biomass - quality and distribution of air in indoor spaces - development of instruments to measure mass-flow and density of a single-phase fluid flow - improvement of heat transfer by boiling at specially treated surfaces are achivements, that will be present in scientific world in the future since they are a subject of interest in many research laboratories around the world. Proof of this is our international collaboration. All our significant achivements were published in international, well established journals with high impact factor and presented at numerous conferences and congresses in Slovenia and abroad. This is regarded as an important contribution to the world's treasury of knowledge. Quality and wide response to our results are proven with many citations.