(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 mmThe 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.
FIELD: mechanical engineering.
SUBSTANCE: wire-tubular evaporator is provided with guide plate whose body is extended lengthwise and at least one tubular clip for securing the plate to evaporator tube. Tubular clip is mounted on bracket extending aside from plate body.
EFFECT: enhanced accuracy of fitting the guide plate along center line of evaporator.
8 cl, 3 dwg
FIELD: cooling and air conditioning system components, particularly evaporators.
SUBSTANCE: evaporator comprises of the first elongated flat multi-channel pipe having serpentine configuration defined by elbow members bent across the minor dimension thereof. The pipe has a number of spaced apart parallel parts extending between ends of the first pipe. Inlet member of clamping means is connected to the first pipe end, outlet member thereof is fastened to the second end thereof. Ribs are located between neighboring parts of the first pipe. The second elongated flat multi-channel pipe forms suction radiator loop. The second pipe is connected to the first one so that side wall of the second pipe defining major pipe dimension is connected to side wall of the first pipe directly upstream of the outlet member of the clamping means to provide improved heat exchange between the pipes. The second pipe ends are also fitted with inlet and outlet members of clamping means.
EFFECT: increased compactness.
20 cl, 8 dwg
FIELD: refrigeration equipment.
SUBSTANCE: cooling agent evaporator comprises cooling agent pipeline and surface connected to the pipeline through heat-conductive connection. The surface is used as heat-exchanger and is covered with water-repellent oil film. The evaporator may be of lamella type (plate type).
EFFECT: decreased noise during evaporator operation.
3 cl, 1 dwg
FIELD: cooling equipment and other industry, for instance, chemical industry.
SUBSTANCE: evaporator comprises panels or coil pipe batteries, as well as liquid and vapor manifolds with coolant. Panels or coil pipe batteries or manifold batteries extend in horizontal direction one under another and are shifted one from another. The panels or coil pipe batteries or manifold batteries are enclosed with iron sheet having varying height. Panels or coil pipe batteries or manifold batteries are inserted in metal frame fixedly connected with metal tray and hermetically closed with plastic sheets along perimeter thereof.
EFFECT: provision of necessary heat carrier temperature and continuous temperature maintenance, decreased power inputs and heat carrier volume, reduced device costs and increased safety.
1 cl, 1 dwg
SUBSTANCE: milk refrigerating unit contains square reservoir with external heat-insulating coating, evaporator, force-suction manifold of compressor-condenser device. Evaporator is of slot type and represents two halves of V-shaped bottom with injector and suction header each, which are connected accordingly with force and suction manifolds of compressor-condenser device, at that slot evaporator is made with seam welding with seam width of at least 4 mm, pitch of seams of not more than 35 mm, depth rolling of slots of not more than 3 mm.
EFFECT: exclusion of evaporator damage during its flushing with hot water.
SUBSTANCE: invention relates to refrigerating equipment used in climate tests. The proposed heat exchanger comprises a housing and evaporator. The heat exchanger housing is separated by the main baffle into inlet and outlet chambers. The inlet chamber inlet accommodates deflecting baffle. The outlet chamber outlet accommodates the outlet pipe-bend and houses the evaporator and additional baffle. The inlet and outlet chambers communicate via a gap arranged between the main baffle and heat exchanger housing. The fan is arranged between the inlet pipe-bend and the housing. The bypass is provided for between the inlet and outlet pipe-bends.
EFFECT: longer faultless operation of evaporator.
2 cl, 1 dwg
FIELD: personal demand items.
SUBSTANCE: refrigerator with a freezing chamber includes a through internal container with a freezing chamber and a storage compartment for cooled products, which are rigidly connected to each other. There is no connection line or broken edge, at that, evaporator (9) is installed on compartment (6) of the freezing chamber. Evaporator is made in the form of a box with winding, which envelopes the freezing chamber in a circumferential direction on its four sides.
EFFECT: providing more effective cooling of products.
8 cl, 3 dwg
FIELD: heating systems.
SUBSTANCE: anti-frost evaporation tube of refrigerator with drawers consists of internal housing wherein there provided is food storage compartment for arranging drawer-container, and in the latter, low temperature is maintained by means of evaporation tube for cooling agent circulation, which is located around external part of internal housing. Evaporation tube includes curved parts located on both side surfaces of internal housing and straight tube part located on upper surface of internal housing and connected to curved tube parts.
EFFECT: use of this invention allows eliminating frost formation on roof surface of refrigerator internal housing.
5 cl, 7 dwg
FIELD: heating systems.
SUBSTANCE: invention refers to cryogenic equipment, and namely to cryogenic liquid evaporators, and can be used in gasification plants. Cryogenic liquid evaporator includes housing with cryogenic liquid supplying assembly and cooling agent output assembly and heat exchange assembly made in the form of a tube bank, inter-tube space of which includes dump packing. In addition, heat exchange assembly is equipped with gas distributing grid located in lower part of tube bank and having the shape of flattened cone installed with smaller base upwards. Dump packing is located on gas distributing grid.
EFFECT: use of invention will allow more efficient use of thermal and physical properties of heat exchange assembly of cryogenic liquid evaporator owing to arrangement of dump packing with section having constant resistance, and creating conditions of uniform distribution and passing of warm gas vapours through the head piece.
SUBSTANCE: invention concerns refrigerating engineering. A heat exchanger (301) is designed to be connected to an evaporator (201) of a heat-transfer system wherein a working medium used is compressed and evaporated. The heat exchanger comprises a first tube (107) with its first end (303) shaped in such a way to be attached to an outlet fitting (204) of the evaporator and to transfer the medium from said outlet fitting, and the second tube (108) with its first shaped in such a way to be connected to the inlet fitting of the evaporator and to transfer the medium to said inlet fitting. The second tube is mounted inside of the first tube, or in thermal contact thereto, herewith ensuring the relations (109, 110) of the respective lengths of the first and second tubes to enable heat exchange between the mediums in these tubes. The first tube is made of the steel alloy consisting of ingredients reducing hardness of said steel alloy, thereby easing bend of the tube and enabling to bend the first tube in installation in the heat transfer system.
EFFECT: application of the invention allows reducing cost of the heat exchanger.
31 cl, 10 dwg
FIELD: personal use articles.
SUBSTANCE: refrigeration and/or freezer device, preferably a refrigerator and/or freezer, comprises a housing with a lid, which is mounted with an ability to move relative to the housing, or with a door or a flap installed to be movable relative to the housing, which has a glass, preferably a glass plate or a plate of polymeric material, or formed from it, as well as a heating device, whereby it is heated. There are the means provided to transfer necessary energy for operation of the heating device, which operate using the principle of inductive power transfer.
EFFECT: use of this invention enables to create a refrigeration unit with a heating device, which is performed without the need for servicing, or rare technical maintenance.
17 cl, 45 dwg