Refrigeration engineering and technology

13 - 17

Authors: Т.V. Morosuk

During last decades, the exergetic method of the thermodynamic analysis became very popular among the researches, particularly working in the field of refrigeration. Well known, that the information obtained from the exergetic analysis cannot be provided by any other methods of thermodynamic analysis, for example, energy analysis. However, the conventional exergetic analysis has some limitations. In order to overcome these limitations, an advanced exergetic analysis has been proposed. The introduction of the advanced exergetic analysis should help engineers and designers in their practical work.

22 - 29

Authors: A.V. Ovsyannik; E.N. Volkova; T.S. Naumova; V.G. Yakimchenko

Heat exchange experimental research results during refrigerants R404а, R407с and R410a boiling on smooth technically roughened surface in free movement conditions in large volume are presented. The dependencies between the quantitative characteristics of the boiling heat transfer process, security settings, and other factors affecting the intensity of heat transfer are established.

37 - 40

Authors: V.V. Klуmenko; M.V. Bosiy; V.P. Parafiynyk; S.О. Prylypko

The way of ensuring of gas turbine drive (GTD) efficiency with fuel gas presence, pressure of which is lower than technologically permissible in the fuel gas gasturbine drive combustion chamber on the basis of gas hydrate technology has been considered. The schematic of fuel gas gashydrate booster device (FGGBD) is given and gas turbine drive with FGGBD operation principle is reported. The FGGBD operating cycle is also shown for the specific composition of fuel gas, its initial pressure and pressure in the combustion chamber of a gas turbine drive. The thermodynamic parameters of the cycle reference poins are determined.

47 - 53

Authors: V.Y. Labay; D.I. Harasym

In modern technologies, which are related to energy transformation, namely in the air conditioning systems, important place is occupied by objects creation and improvement of which requires the use of innovation thermodynamics. Classic apparatus of this science is often insufficient to solve new tasks; it is necessary not only to its further development, but its combination with the elements of a systematic approach and energetics. Innovation mathematical research model of the central straight flow air conditioning system for cleanroom in order to computer’s estimation its energy effective by virtue of exergetic output-input ratio depending on different factors, which have influence on its work, was described in this article. The dependence of exergetic output-input ratio for chosen air conditioning system е on temperature difference between the inside and the supplied air tS tin tS, depending on excess heat in the cleanroom, and moisture content dout of outdoor air was defined thanks to this model. It is shown that the chosen air conditioning system should be preferably used at higher temperature difference between the inside and the supplied air, namely, for example tS = 6,0°С (respectively outdoor air temperature tout = 42°С), that will give the opportunity to gain the highest exergetic output-input ratio е , which means to gain the most advantageous economical variant of exploitation of chosen air conditioning system.

58 - 64

Authors: А. Gurskiy; V. Denisenko; A. Goncharenko

Characteristics of the Odessa Port Plant turbo-compressor unit for ammonia re-loading are discussed in the article. Analysis of operating power efficiency of the unit for ammonia re-loading is given. On the basis of the analysis the method for determining indirect parameters of unit functioning and its utilization in the control system is presented. The virtual stall designed for the study of refrigerating turbo compressor control system with readings of deficiencies on the parameters ratio for evaluation of operating modes is also introduced.