Cooling battery

 

(57) Abstract:

The invention is intended for use in refrigeration and applies chamber cooling equipment. Cooling the battery pack contains a heat-exchange elements in the form of tubes with longitudinal ribs. At the ends of the ribs rigidly fixed nozzles from a material with a thermal conductivity less than thermal conductivity of the material of the ribs. The height of the nozzles are determined by calculation according to certain dependencies. During operation of the cooling battery with nozzles reduced power consumption mode thawing and shortens the duration of the process. 2 Il.

The invention relates to a device for cooling products, namely chamber cooling equipment.

Known smooth-tube cooling of the battery equipped in the section and along the walls /A. N.Galperin, Installation and commissioning of refrigeration systems), Food industry, 1976, S. 290, 300/. The disadvantages of these batteries are a significant intensity, duration of defrost and complexity when removing ice from the battery.

Known finned cooling battery containing a pipe with a filter on them with a certain step edges of the metal strip /M the disadvantages of the known batteries are the duration and intensity of the process of removing ice due to the significant adhesion to the surface of the tubes and fins /the value of the adhesion reaches 1.5 MPa/, and actively ice settles in the intercostal space, which greatly complicates its removal.

The closest to this invention to the technical essence is cooled battery containing heat exchange elements in the form of pipes for the circulation of refrigerant with longitudinal ribs /SU 1388677, A1, F 25 D 13/06, 15.04.88/. Ribs located on opposite sides of the pipe.

The disadvantage of this battery is that during the operation of the ice grows on the end faces of the ribs, resulting in the removal of the formed semi-cylinders of ice can be made only after thawing of the ice layer on the end face of the ribs, which increases the duration of the defrosting process and the energy consumption for the removal of ice.

Technical result achieved in the implementation of this invention is to reduce energy costs and reducing time to thaw.

To achieve this, the technical result of the cooling coil containing heat exchange elements in the form of pipes for the circulation of refrigerant with longitudinal ribs differs in that it is provided with nozzles rigidly mounted on the ends of the ribs, while the nozzle is made from a material with a thermal conductivity less who their designated contact edges and tips.

The use of the nozzle allows you to adjust the process inebration on the longitudinal edges adjacent to the pipe. In this case, if the nozzle is made of a material having a thermal conductivity less than that of the material of the ribs, at the base of the fin, the temperature will be lower than the height of the nozzle. Thus the nozzle is achieved at temperatures above the dew point temperature of the ambient air, or equal to the ambient temperature. In such conditions the process of inebration on the upper part of the nozzle does not occur, and therefore formed between the ribs plots snow coats are not interconnected at the top and to remove them when the defrost is necessary to bring only that amount of heat which is necessary for the little ice layer in the zone of contact of the latter with the outer surface of the battery. The thickness Poltavchenko layer should be equal to the height of Microsystem the battery. During the formation of the liquid phase adhesion of ice to the surface of the tubes and fins are completely broken and the semi-cylinders of ice under the action of gravity to slide off the battery down.

The pipe dimensions, edges, nozzles can be different and depend on the materials from which they are ishemia dimensions of the ribs and the nozzle can be defined as follows.

The temperature at the end surface is described by the expression:

< / BR>
where tto- the temperature of the air in the chamber, %;

t0- boiling point refrigerant in the pipe;

n- the ratio of the outer heat transfer from the battery to the air chamber, W/(MK);

R - thermal resistance between the refrigerant boiling in the tube, and the air in the chamber, MK/W,

< / BR>
whereinthe coefficient of heat transfer from the boiling of the refrigerant to the inner surface of the pipe, W/(MK);

C,Tr,c,p,to,nthe thickness of the contamination on the inner surface of the pipe, pipe, pipe joint and ribs, ribs, designated contact ribs and tips, nozzles, respectively;

C,Tr,c,p,to,n- coefficient of thermal conductivity impurities on the inner surface of the pipe, pipe, pipe joint and ribs, ribs, designated contact ribs and tips, nozzles, respectively. Identifying all known thermal resistance

< / BR>
let us write the expression (1) in the following form:

< / BR>
Denoting the unknown thermal resistance

< / BR>
let us write the expression (3) in the following form

< / BR>
From the obtained expression the ATA in the form of snow fur coat, i.e. that the temperature of the end part was above the dew point of the surrounding air. Asking the material from which must be met nozzle, and thermal resistance of the contact areas of the ribs and the nozzle defined by the nozzle size. Thus, the use of nozzles of the material, the conductivity of which is lower than thermal conductivity of the fin, can dramatically change the temperature of the fin at its height, and by increasing thermal resistance of the nozzle to bring it to values greater than the dew point of the ambient air or to the value of the ambient temperature.

The combination of materials that can be executed nozzle and edge seem to be the most diverse. Thus, the pipe and the edge can be made of aluminum / = 220...218 W/MK/, iron / = 360...445 W/MK/, Nickel / = 210...137 W/MK/ copper / = 413...398 W/MK/ as well as carbon structural steels / = 31...54 W/MK/ stainless steels / = 12...27 W/MK/ etc.

The nozzle may be made of rubber / = 1,62 W/MK/, asbestos / = 0,81 W/MK/, rubber / = 1,84 W/MK/, PCB / = 1,51 W/MK/, carbon or graphite / = 0.67 W/MK/, porcelain / = 0,91 W/MK/, ebony / = 1,42 W/MK/, epoxy resin / = 1,1 W/MK/, PTFE / = 0,058 W/MK is epoprostenol materials ribs and tips differ on average in 10...1000 times that provides a variety of their uses depending on the specified conditions.

Thus, the essential features of the claimed device are performing a nozzle from a material with a thermal conductivity less than thermal conductivity of the material of the ribs and the tip height, which is determined depending on the material of the nozzle and thermal resistance of the contact areas of the ribs and tips.

Let us consider an example illustrating the determination of the geometric size of the nozzle. The calculations are for storage of frozen goods atto25oC = 90%, the boiling point of the refrigerant t0= -35oC, the battery cooling made of pipes with a diameter of C,5 mm / = 46,5 W/MK/. The coefficients of heat transfer from refrigerant /ammonia/in= 350 W/MK, and the side airn= 10 W/MK. The edge is made of steel heightp= 0.02 m (p= 46,5 W/MK) and is welded to the pipe, i.e., thermal resistance at the connection is missing. On the inner surface of the pipe there is pollution in the form of oil film thicknessC= 0,003 mC= 0,14 W/MK.

J-d diagram of the air find the dew point for air with the given parameters, tTr= -2 -25oC, accept custom-made from the graph / = 0.67 W/MK/, the edge and the nozzle glued with epoxy resinn= 0,001 m = 1,1 W/MK. We will substitute the original data in the expression /4/

< / BR>
Next, find the appropriate height of the nozzle;

n/n= 0,4;n= 0,40,67 = 0,26.

Thus, the required height of the nozzle is equal to 38 mm

The invention is illustrated by drawings, where

in Fig. 1 schematically shows a cross-section of wall cooling battery with two longitudinal ribs located on opposite sides;

in Fig. 2 - cross section of ceiling cooling battery with three longitudinal ribs arranged at an angle of 120oeach other.

Cooling coil /Fig. 1, 2/ includes a heat exchange element in the form of a pipe 1 for the circulation of refrigerant located in the vertical plane of the longitudinal ribs 2. Battery supplied by nozzles 3, rigidly attached to the ends of the ribs 2. For clarity, it is shown that the cooling of the battery is covered with a layer of 4 snow coats. The nozzle 3 is made from a material with a thermal conductivity less than thermal conductivity of the material of the ribs and have a height that is determined depending on the material of the nozzle and thermal resistance Mesdames way.

In the process involves condensation of water vapor contained in the air chamber, on the surface of the pipe 1 and the ribs 2, as these surfaces have a temperature below the dew point of the ambient /chamber/ air. On the end surface of the nozzle /3/ condensation of water vapor occurs because these surfaces have a temperature above the dew point of the ambient /chamber/ air /Fig. 1, 2/. In the process of cooling the battery is namerzanie snow coats 4 in the form of unconnected semi-cylinders of ice. When implementing defrost snow coat slips down in separate semi-cylinders of ice after the formation of Poltavchenko layer in the contact zone her with the surface of the pipe 1. Formed a separate semi-cylinders of ice, it is advisable to use for technological purposes. Mount nozzles 3 ribs 2 is, for example, by gluing, to the interference fit, and so forth.

The geometric shape of the nozzle 3 should be implemented in the form of dumbbells, pear-shaped, and the like.

The offered nozzle for cooling the batteries: the wall /two longitudinal ribs on opposite sides, Fig. 1/ ceiling /with three prodaim analogous to the energy in the mode thawing 2.5 - 3.5 times and to reduce the duration of the process 2 - 3 times.

Cooling coil containing the elements in the form of pipes for the circulation of refrigerant with longitudinal ribs, characterized in that it is provided with nozzles rigidly mounted on the ends of the ribs, while the nozzle is made from a material with a thermal conductivity less than thermal conductivity of the material of the ribs and have a height that is determined depending on the material of the nozzle and thermal resistance of the contact areas of the ribs and tips.

 

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