Refrigeration engineering and technology

4 - 11

Authors: А.V. Doroshenko; К.А. Rzhesik; М.V. Gordienko

The concept of an evaporating cooling gases and fluids on the basis of the new generation multichannel polymeric structures. Natural cooling limit in such systems is the dew point of the ambient air, which significantly extends the capabilities of evaporative cooling technology in general and allows you to solve a number of problems of refrigeration and air-conditioning with a significant reduction in energy costs for implementing the processes. Special attention is paid to the condensation of water vapor when deep evaporative cooling media. Is made on the basis of theoretical and experimental data, the authors, preliminary analysis of the possibilities of such refrigerants with respect to evaporative cooling water in cooling towers and chillers.

16 - 23

Authors: V.А. Nayer; А.V. Rozhentsev; Hаsаn Vеsаm Anvar Аli

An autonomous cryosurgical apparatus that uses latent heat of melting of a prefrozen working substance as a source of cold is considered in the present article. The process of the substance freezing is taking place in a cold accumulator that represents a hermetically sealed container. In the course of the phase transitions “liquid - solid body – liquid” amount of the working substance is unchangeable and therefore the cold accumulator can be used repeatedly. A separate refrigerating machine could be used to freeze the working substance in the accumulator and this makes the peculiarity of the apparatus. A Joule-Thomson refrigerating machine of a simple design with a phase separator and operating by use of a zeotropic mixture of refrigerants can advisably be used for this purpose. Thermophysical properties of more than 20 substances candidates with melting temperatures within the range of (-100…-150)°С that is acceptable to the apparatus operating conditions are presented in the article. Ethanol seems to be the most appropriate agent which is in a liquid state under the normal conditions; has the melting/freezing temperature of -114°С and the latent heat of phase transition “solid body – liquid” of 104.4 kJ/kg.

29 - 37

Authors: V.P. Buzovskiy; M.M. Kologrivov

The paper presents the design of gas-liquid flow characteristics of the flambeau which is formed in a parallel-flow direct contact heat exchanger at horizontal liquid atomizing. All known earlier computational models were developed for vertical ejection apparatus [5]. Presented model of the flambeau hydrodynamics can be used in the heat and mass transfer processes during condensation of oil products vapor from the vapor-gas mixtures on the drops of atomized liquid simulation. An algorithm for numerical solution of differential equations systems that constitute the model is proposed.

45 - 48

Authors: V. Kogut; I. Butovskyi; N. Nosenko

The article dealt about inkjet devices, heat exchangers in the oil processing industry. The authors focus on an entirely new design inkjet device, heat exchanger with contact heat exchangers - thermal condenser ejector. The analysis of the thermal condenser representing the phenomenological model of the flow behavior of in the unit. Also in this article presents a superficial calculation thermo ejector condenser.

55 - 59

Authors: V.V. Klymenko; A.V. Skrypnyk; M.V. Lychuk

The article deals with the classification of fruits and vegetables storehouses on the basic characteristics that determine the conditions of natural cold use in them. The schematic solution of the storehouse with outside air active ventilation system, equipped with dynamic thermal insulation and natural cold gas hydrate battery is proposed. The usage of natural cold gas hydrate battery for heat flows localization allows to reduce energy consumption for cooling of products in the system of active aeration and to increase an exergy efficiency in 1,2...1, 8 times.

66 - 70

Authors: I.V. Grishchenko

The article provides the method of optimal reservation hub equipment to ensure the required level parameter «betweenness». Solution of the problem of optimal reservation enables you to define the structure of the provision of network nodes to ensure sustainable operation of the network to improve survivability of the infocommunication network functioning.

78 - 80

Authors: А.G. Stepanenko

Sets out the requirements of the Manila amendments that have made significant changes in training requirements for masters and chief mates are given. Five programs, where all requirements of amendments-2010 are considered, for training courses are developed. The analysis of the problem of simulator training students in light of the requirements of the Manila amendments to the STCW IC is done. In these programs, special attention is given to practice skills on simulators and practice sessions.