Vol 93, No 3 (2004)

Cover Page

Full Issue


Ice slurry and single-phase coolants

Tsvetkov O.B., Laptev Y.A.


For more than 20 years at the beginning of the year, St. Petersburg State University of Low-Temperature and Food Technologies (SPbGUNiPT) together with the Working Group “Properties of Refrigerants and Heat Transfer Agents” of the Scientific Council of the Russian Academy of Sciences on the complex problem “Thermophysics and Thermal Power Engineering”, and for the last 11 years together with the International Academy Cold (MAX) holds traditional international conferences on topical issues of modern thermal physics and refrigeration technology. The theme of the last of them, held in February 2004, was "Ice-slurry and single-phase coolants." N.E. Bauman, MGUPB, MGUIE, Moscow State Regional University, Cryogenmash LLC, Moscow Compressor Plant, VNIHI, Spektroplast LLC, Khimsintez NPO, M.V. Lomonosov, CJSC TRANSAS Electronic Technologies, State Unitary Enterprise VNIPI of integrated energy technology, Airkul LLC, OK CJSC, St. Petersburg State Aviation Administration, JSC Kholodmash (Yaroslavl), industry magazines, including Refrigeration Technology. The conference was opened by the President of the Moscow Academy of Arts, Rector of St. Petersburg State University of Universities, Doctor of Engineering, Sciences, Prof. A.V. Baranenko.

Refrigeration Technology. 2004;93(3):2-4
pages 2-4 views

Mass transfer characteristics during freezing of vegetable products in ice slurry

Kolodyaznaya V.S., Sokolov V.N.


The paper is devoted to research of mass exchange characteristics vegetative products in perspective not boiling cold-carrying media — ice slurry. Absorption by a product of the refrigeration medium dissolved substances after various stages of processing are established. The quantity’ of acts of the freezing appropriate to increase cryoscopic temperature of medium on 1 Cis revealed. Increase of mass exchangefactor P at rising of medium speed is designed.

Refrigeration Technology. 2004;93(3):5-8
pages 5-8 views

Physical and chemical properties of coolants based on aqueous solutions of ethylene glycol in the presence of electrolyte

Kirillov V.V., Baranov I.V., Samoletova E.V.


Decrease in viscosity of the coolant based on aqueous solution of ethylene glycol when electrolytes are introduced into its composition is being investigated. The versions with different mass fractions of ethylene glycol (23,6—46,4) and electrolyte concentrations (0,04—0,75 mol/kg) have been considered. A technique of the experiment and results of determination of characteristics of all types of coolants are presented. It has been found that the least viscosity is achieved with the minimum of electrolyte concentrations tested.

Refrigeration Technology. 2004;93(3):9-11
pages 9-11 views

Environmentally friendly coolants, application features, properties

Marinyuk B.T., Barannik V.P.


Characteristics and fields of application of most common intermediate coolants: salty coolants, aqueous solutions, propylene glycol, as well as coolants of new generation — Ecosol and Ecofrost are considered.

Refrigeration Technology. 2004;93(3):12-13
pages 12-13 views

Energy-saving refrigeration supply of local-central SCR in a shopping mall

Kokorin O.Y., Smirnova I.N.


А refrigeration supply system of local-central air-conditioning system in a trade complex is described in detail. Energy saving is obtained through the use of refrigerating machines only in summer period. Daily fluctuations in refrigeration demand are traced by flexible system of automatic control of York refrigerating machines as used in the project. In winter period the AC system refrigeration demand is provided with cold outside air.

Refrigeration Technology. 2004;93(3):14-18
pages 14-18 views

Experimental studies of heat exchange batteries with wavy and louvered fins

Lozza G., Merlo H.


The use of an improved fin profile in heat exchange batteries contributes to the creation of highly efficient heat exchangers widely used in air conditioning and refrigeration systems.

Refrigeration Technology. 2004;93(3):20-22
pages 20-22 views

New piston compressors "Octagon". Part 1. Comparison of reciprocating, screw and scroll refrigeration compressors


In the market for small displacement compressors for refrigeration and air conditioning applications, the trend is towards rotary compressors, while in low temperature refrigeration applications reciprocating compressors continue to be preferred. Increasing demands for energy efficiency, ease of use, the use of new environmentally friendly refrigerants intensify competition in this market sector. In this article, using the example of semi-hermetic reciprocating compressors of the new Octagon series, we would like to show how, with the help of simple technical solutions, it is possible to create products that meet the increased requirements of the modern market. First of all, let's consider some fundamental differences between reciprocating compressors and scroll and screw ones.

Refrigeration Technology. 2004;93(3):24-26
pages 24-26 views

Evaluation of the tightness of the compressor stages, taking into account the wear of the piston seals during operation

Kuznetsov L.G., Ivanov D.N., Molodova Y.I., Berlin E.A., Prilutsky A.A.


Ал analytical expression was deduced for a conditional clearance determining the amount of leakage through piston sealing of the compressor, which allows to take into account the wear of rings during operation. An example is given for the calculation of leakage in I and II compressor stages of expander-compressor unit DKA 20-10/1C taking into account the wear of rings according to the offered technique. The technique allows to predict periodicity of rings change knowing the design and operating conditions of the stage.

Refrigeration Technology. 2004;93(3):28-31
pages 28-31 views

Operation of hermetic compressors at low ambient temperatures

Shishov V.V.


Practice shows that in winter, when operating a refrigeration unit located outside, compressors often fail due to broken valves or bearings. One of the reasons for such accidents is the unpreparedness of the unit for winter operating conditions.

Refrigeration Technology. 2004;93(3):37-37
pages 37-37 views

The results of the practical application of the portable plasma welding machine "Multiplaz-2500"

Ermishin Y.M.


Numerous publications about the apparatus "Multiplaz-2500", which until now appeared in various publications, were of a popular scientific nature.

Refrigeration Technology. 2004;93(3):38-39
pages 38-39 views

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