energy efficiency

Stages of the modern it services development and energy effectiveness of network technologies

The article reviews the architectural transformation of modern networks and their (mobile) services and applications. Periods of network services, Internet and cloud computing are posted. We describe the requirements for telecommunication networks in each of the individual stages of development and performance criteria specified network technologies.
The paper presents the measures that should be taken to improve the energy efficiency of modern technology making in the development of telecommunications networks of the future.

Optimum control system of pmsm with field weakening by variable voltage supply

The paper presents an algorithm for motor control by electric drive based on synchronous motor with permanent magnets (PMSM), which ensures maximum energy efficiency. The algorithm was tested by computer simulations using field weakening with different supply voltages

Оптимальні форми та ізоляція ємнісних акумуляторів теплоти систем теплопостачання

In this article the results of research of tank of accumulator are resulted as capacity heat exchangers. Offered capacities of tanks of accumulators with the different forms of bottoms, their sizes are found. Deductible thickness of the insulation of accumulator with optimum conditions. Time of cooling of accumulator is found.

Possibilities of the aerogel application in building

The paper presents the aerogel, material which can be more widely used in building. The examples of the use of aerogel and the results of laboratory tests connected with the insulation properties are presented. It seems that the aerogel, due to its good thermal characteristics can improve the energy efficiency of buildings.

Thermo-physical evaluation of an ultra-low-energy family house

Ultra-low-energy house is a term known very well to engineers and architects all over the world. In these times of minimizing an energy loads and negative emissions, energy efficient houses are one of the best ways to meet European “20-20-20” targets. The main topic of this paper is to create a building envelope assessment of an ultra-low-energy family house designed for Slovak Republic climate. Family house was designed taking in account architectural, environmental and constructional requirements of today´s European directives focusing on energy performance and energy efficiency.