Open Access Open Access  Restricted Access Access granted  Restricted Access Subscription or Fee Access

No 2 (2015)

Full Issue

Open Access Open Access
Restricted Access Access granted
Restricted Access Subscription or Fee Access

Articles

Kerrier. Chillery Carrier Aquasnap novogo pokoleniya

- -.
Refrigeration Technology. 2015;(2):4-5
pages 4-5 views

Mirovoy rynok konditsionerov

- -.
Refrigeration Technology. 2015;(2):6-9
pages 6-9 views
pages 10-16 views

Emerson. Rasshirenie semeystva TraxOil. Ustroystva kontrolya urovnya zhidkosti LW4 i LW5

Kalashnikov F.K.
Refrigeration Technology. 2015;(2):17-23
pages 17-23 views

Mirovoy rynok teplovykh nasosov i ikh komplektuyushchikh

- -.
Refrigeration Technology. 2015;(2):24-27
pages 24-27 views
pages 28-31 views

Gyuntner. Klyuchevye produkty gruppy GüNTNER na «Mire Klimata 2015»

- -.
Refrigeration Technology. 2015;(2):32-35
pages 32-35 views

Rekomendatsii Mezhdunarodnogo instituta kholoda po proizvodstvu i khraneniyu zamorozhennykh pishchevykh produktov

- -.

Abstract

Scientific aspects of freezing, storage and thawing foodstuffs are examined. Thermophysical aspects of freezing include such notions as an initial point of freezing (a cryoscopic temperature of ice formation beginning); ice crystallization that is a period of appearance of first ice crystals before their precipitation in the solution. The crystallization period is characterized by the initiation of crystallization centers, crystals growth accompanied by water diffusion. The ice content in frozen substances is a function of the temperature and the initial concentration of dissolved substances in them. As a rule at temperatures lower -40 оС the change of ice quantity in frozen products is not observed. The storage of frozen products may be accompanied by the crystals size growth that is called a secondary crystallization leading to water diffusion into the intercellular space and as a result to increasing the speed of destruction and intensive exudation at defrosting. To prevent the secondary crystallization the cryoprotectors are introduced in the product. At freezing the change of the volume and mass (loss of weight) of the product takes place as well as its thermal properties are modified (heat conductivity and specific thermal capacity). Keywords: thermophysical aspects of freezing, cryoscopic temperature, ice crystallization, secondary crystallization, cryoprotectors, loss of weight.
Refrigeration Technology. 2015;(2):36-39
pages 36-39 views

Raschet vozdukhoraspredeleniya pri okhlazhdenii myasnykh produktov v kamerakh s potolochnymi vozdukhookhladitelyami

Malova N.D., Murzin S.Y.

Abstract

Modern chambers for finished meat products cooling after thermal treatment are made in general in the form of heatinsulated apparatuses. The chambers with duct air distribution and ductless air distribution are used. In the chambers with duct air distribution the cooled air is supplied through nozzle and slit attachments of the supply ducts that provide a vertical supply of cooled air downright using the effect of the laying on the longitudinal walls out of the product zone with following air motion in the product zone upwards according to the mode of a “reversedirection” flow. At such an air distribution the cooled flows go to the product having equal parameters of distribution that provides equal conditions of refrigeration of products and power inputs reducing. Among the chambers for meat products refrigeration with ductless air distribution the most effective are the chambers with a ceiling air cooler with unilateral air supply. They have the same organization of the cooled air motion as the chambers with duct air distribution: using the effect of the laying on the plane barriers out of the product zone with following air supply into the working zone of the chamber by the mode of a reversedirection flow. Now these chambers are widely used for meat products refrigeration. The method of calculation of air distribution in the chambers of refrigeration of meat products placed on the floor carts is given. The chambers are equipped with ceiling air coolers with unilateral air supply that refrigerate products by the air cross flows using the effect of the laying of incoming air jets (duct systems of air distribution are not applied). The investigations of air distribution under conditions of finished meat products refrigeration after thermal treatment corresponding to the technological recommendations are carried out. The most effective conditions to refrigerate smoked sausages and other meat products are defined. They are: air speed in the product zone, duration of refrigeration, specific power inputs by 1 kg of refrigerated products. The method may be used to calculation of air distribution in chambers for refrigeration of any other products. Keywords: calculation method, ductless air distribution system in the cooling chambers, ceiling air coolers, effect of the laying of incoming air jets, specific power inputs.
Refrigeration Technology. 2015;(2):40-44
pages 40-44 views

Apparatnoe oformlenie energosberegayushchey sistemy razdeleniya vozdukha

Galimova L.V., Sedoykin I.E., Kobozev A.I., Slavin R.B.

Abstract

The air separation plant KzhAzh0,04 was investigated. During the separation process heat emission occurs that influences negatively the production process in frostfree season. The most heat emission is linked with the compaction process as a result of which compressible air is heated up to 180...230 °С. To refrigerate air after each stage of the compressor the doublepipe heat exchangers are placed, they are refrigerated using a refrigerating cooling tower. The air temperature after the end heat exchange is of 35...42 °C that is higher by 10...15°С in comparison with the regulated temperatures. So the quality of oxygen produced is reduced. To achieve the regulated temperatures before the adsorber of the air separation plant the energy save system is placed, it includes an absorption refrigerating machine (ARM), a boilerutilizer, a water heat exchanger and an air prerefrigeration heat exchanger. On the grounds of the ARM thermal design the heat loads on all components as well as the required refrigerating capacity of the machine that is 23 kW are determined. Using the catalogue a new generation ARM -VST23 by “BROAD” firm is chosen. The calculations were carried out, the performances of the boilerutilizer, an air prerefrigeration heat exchanger as well as a water heat exchanger were obtained. Keywords: energy saving, air separation, plants, oxigen, ammonia, absoption refrigerating mashine.
Refrigeration Technology. 2015;(2):45-48
pages 45-48 views

Svyaz' napravleniya perenosa teploty v protsesse teploobmena s printsipom vozrastaniya entropii

Kolosov M.A.

Abstract

We apprehend heat transfer from the body at higher temperature to the body at lower temperature at heat exchange as a fundamental property of environment. But as it is known the direction of a thermodynamical process passing is determined by entropy, and in the case of nonequilibrium heat exchange it may lead to heat transfer in unusual direction. In the thermodynamical system in which a nonmonotonous dependence exists between entropy and energy, for example, when a molecular construction of one of the bodies has a limited number of a quantum state, a spontaneous heat transfer from the body at lower temperature to the body at higher temperature is possible. A theoretical possibility of the inversion of a heat flow direction is shown in the paper. The experiment in the system at limited number of quantum states allowed certifying a dominant importance of entropy when defining the direction of the thermodynamic processes passing as well as the possibility of a practical realization of a heat flow inversion. Keywords: entropy, heat flow direction, spontaneous heat transfer from the body at low temperature to the body at high temperature, magnetic entropy, quantum states of the body.
Refrigeration Technology. 2015;(2):49-52
pages 49-52 views

Kholodil'noe oborudovanie na «Prodekspo2015»

- -.
Refrigeration Technology. 2015;(2):53-58
pages 53-58 views

Posobie dlya remontnika. Regulyator proizvoditel'nosti

Kotzaoglanian P.
Refrigeration Technology. 2015;(2):59-64
pages 59-64 views

This website uses cookies

You consent to our cookies if you continue to use our website.

About Cookies