Vol 106, No 2 (2017)

The work is dedicated to the comparison of the domestic and foreign standard documentation in the field of maintaining the microclimate in data processing centers (DC). The paper examines admissible and optimal climatic ranges; also the analysis of trends to moderate requirements for the control accuracy of given climatic parameters in DPC was carried out. The study defines the algorithm of actions of a designengineer to choose correct calculation values of temperature, humidity and other parameters of the microclimate inside DPC. The most important steps when defining the calculation parameters that require the specific attention and qualification are marked out. It is shown that in spite of the foregrounding, the Russian design standards became oldfashion in comparison with foreign ones, as they were elaborated for application in data processing technique that differed principally from modern one as regards type and construction. Therefore the analysis of some foreign standards in this field as well as the research of recommendations in them were carried out with the aim to apply them in the projects of the Russian DPC to increase their manufacturability and saving energy that is needed for supplying the air conditioning systems in DPC.

Water at near zero temperature is largely used in main industrial sectors. Conventional vaporcompression methods of cold water production impact negatively on the environment, they have low energy performances as well. So, the search of alternative methods of liquid cooling is a priority task all over the world. The paper examines a principal circuit of vacuumevaporating cooling of the water film flowing down on a developed surface. A mathematical model describing the liquid cooling process and allowing estimating the process time duration is given. A theoretical analysis gave the possibility to reveal the main parameters influencing the process efficiency.

It is shown that in a real Stirling machine with losses from internal and external irreversibility there can be achieved optimal cooling temperature at which the degree of thermodynamic perfection becomes the maximum. Results of arrangement of various CGMs, including Stirling, working with the unsteady flow of the working fluid are considered. Place of the Stirling cryogenic machine family made in the considered systematization, which uses only the general thermodynamic features, is determined.