RU2521424C1 - Method of compression refrigerator condenser cooling - Google Patents

Abstract

FIELD: heating.

SUBSTANCE: method for cooling of a condenser in a compression refrigerator is proposed and implies usage of water and wetting of the condenser surface by this water, the method is distinguished for the fact that water from a defrost water pan in a refrigerating cabinet or other water source in a refrigerator is led to a trough with a pipe of the condenser pipe coil being installed in its centre, the water trickles down the inclined trough elbows by gravity and provides for wetting of the surface of the trough and condenser pipe, the residual defrost water is led to a tank on the compressor.

EFFECT: improved efficiency of defrost water usage along with the simultaneously improved efficiency of evaporative cooling of the compression refrigerator condenser.

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Description

The invention relates to refrigeration, in particular to methods for cooling a condenser of a compression refrigerator, and may find application in improving domestic refrigeration appliances and compression-type refrigerators.

There is a method of cooling a condenser in domestic refrigeration appliances in the refrigeration cycle: compressing the refrigerant with a compressor, transferring heat from the refrigerant to the condenser, followed by evaporation of the refrigerant in the evaporator (Vainberg V.B. Vayn V.P. Household compression refrigerators - M: food industry, 1974 S.99-101) [1]. In this case, the condenser transfers heat to the surrounding air by natural heat exchange or by blowing its surface with a stream of air from the fan, which increases the intensity of heat transfer.

There is also known a method of cooling a condenser and a device for a refrigeration unit of a household compression refrigerator (patent RU No. 2162576 C2 2001.01.27 “Device for a refrigeration unit of a household compression refrigerator” [2]. The method consists in moistening the surface of a condenser coated with a heat-conducting adsorber, which ensures its cooling due to evaporation of water supplied to the surface of the condenser with a device consisting of a dispensing and collecting trays and a pump with direct and non-return valves. The prototype sensor includes a pump whose operation is provided by vibration of the compressor housing.This method implements the principle of evaporative cooling of the condenser, but its implementation is relatively complex and unreliable, since the pump vibration is not enough to lift water into the upper tray, the system of the upper and lower trays is bulky and unreliable .

A known method of cooling a condenser of a compression refrigerator (Patent RU No. 2458291 “Method of cooling a condenser of a compression refrigerator”. Published: 08/10/2012 Bull. No. 22) [3], which uses moistening the surface of the condenser, the accumulation of water in the pan below the surface of the condenser, blowing the surface condenser fan. This technical solution also implements the effect of evaporative cooling, but requires the use of a fan, which complicates the design of the condenser and increases the energy consumption for fan power.

There is also known a method of cooling a condenser by wetting its surface with water and its subsequent evaporation (Patent RU No. 2 455586. “Method for cooling a condenser of a compression refrigerator.” Published: July 10, 2012 Bull. No. 19) [4]. In this method of cooling a condenser, its surface is irrigated with an air-water mixture of finely dispersed nozzles with a drive. In this case, the drive is turned on / off by a signal from the moisture sensor of the condenser surface.

The advantage of this method of cooling the condenser is that moistening the surface of the condenser with subsequent evaporation of moisture provides both cooling of the condenser and a decrease in the specific energy consumption, raising the overall efficiency of the refrigeration cycle.

The disadvantage of this method is the relative complexity of its implementation, since it is necessary to use nozzles and a drive to irrigate the surface of the capacitor, which also consumes power.

The closest in technical essence to the claimed is a method of evaporating melt water on the surface of the compressor and partially on the surface of the condenser (Patent RU No. 2429431 "Device for evaporating melt water collected in the tray for melt water, and a refrigerator with such a device" ) [5]. This technical solution is taken as a prototype.

In the prototype method, melt water, after it is withdrawn from the refrigerator, is guided through a channel into a groove fixed to the compressor surface. Water from the groove through capillary tubes fixed on the upper part of the compressor rises due to the capillary effect to the upper part of the compressor, where it evaporates, which is also important for cooling the compressor surface. Another option is to raise melt water from the groove in the middle of the compressor with capillary tubes or a pump to the lower turns of the condenser, where it also evaporates.

The objective function of such a solution is, first of all, the evaporation of melt water.

The disadvantage of the technical solution for the prototype is that melt water is inefficiently used for evaporative cooling of the condenser. According to the prototype, melt water flows by gravity down the pipe into the lower part of the refrigerating cabinet into the groove on the middle part of the compressor surface, and from there they rise through the capillary tubes or with the pump to the lower branches of the condenser coil. Additional electricity is expended on the pump, capillary tubes are limited in length (lift height) and low productivity.

In addition, most of the surface of the capacitor remains moist.

The task of the invention is to increase the efficiency of using melt water while increasing the efficiency of evaporative cooling of the condenser of the compression refrigerator.

The problem is solved in that the method of cooling the condenser of the compression refrigerator, including the use of melt water and moistening the surface of the condenser with this water, is such that from the melt water collector in the refrigerator or from another source of water in the refrigerator, the water is directed into the groove, in the middle of which the condenser coil tube, while water flows by gravity along the inclined elbows of the groove, moistening its surface and the condenser tubes. Residual melt water is sent to a container on the compressor.

The essence of the claimed method of cooling the condenser of the compression refrigerator is illustrated by the example of the implementation of the proposed method, shown in figures 1-3. Figure 1 shows a General view of the rear wall of the refrigerator with a condenser and compressor, figure 2 shows a view of the condenser coil with a groove and the cross section of the groove with the coil tube along AA. Figure 3 shows the node overflow of water from the upper branch of the capacitor coil to the lower.

The compression refrigerator contains a cabinet 1, a compressor 2, an outlet channel 3 for melt water from a refrigerator, a groove 4, a cooled tube 5 of a condenser coil.

Melt water from the refrigerator 1, from the outlet channel 3 (Fig. 1) enters the groove 4, covering the tube 5 of the condenser coil. To ensure gravity of water through the groove from top to bottom, each horizontal branch of the condenser coil tube is made obliquely to the horizontal plane, with an angle of inclination of 3 ... 10 degrees.

On the bends 6 of the coil of the condenser tube 5 (Fig.2, 3) from the upper groove 7 to the lower groove 8, water flows along the vertical channel 9. Two vertical strips 10 (Fig.3) and two side plates (not shown) on the end sections of the strips 10 form a vertical channel 9 for overflowing water from the upper groove 7 to the lower 8. In this case, the bottom part of the grooves 7, 8 and the bar 10 of the vertical channel 9 are connected to the tube 5 of the condenser coil by sealing elements 11.

When melt water is formed and it leaves the internal volume of the refrigerator 1, water is directed through the outlet channel 3 to the groove 4. Under the action of gravity, the water flows through the groove 4 to the bending section 6 of the condenser coil tube and is directed along the vertical channel 9 to the groove located below upper groove. Water flows in a similar way along the grooves of the coil from top to bottom in the lower part of the condenser. The last groove is equipped with a vertical channel 13 for supplying the remainder of the melt water to the container located on the compressor.

The number of grooves covering the tube of the capacitor coil can be different either on all inclined portions of the capacitor coil or only on part of these sections.

Along with melt water, water used in the refrigerator for other purposes can be used to cool the condenser, for example, to prepare edible ice or other water specially drawn into a special container for cooling the condenser.

In the claimed method, the use of melt water for cooling the condenser provides an increase in the efficiency of using melt water with a simultaneous increase in the efficiency of evaporative cooling of the condenser of the compression refrigerator, since evaporative cooling in this method is implemented more rationally in comparison with the prototype and other known methods of cooling the condenser.

The use of melt or other water to cool the condenser allows the efficient use of evaporative cooling, which is directly related to the increase in the cooling efficiency of the refrigerant in the condenser and the increase in the coefficient of cooling of the COP; This ensures a reduction in energy consumption of BHP, a decrease in the load on the compressor and, as a whole, increases the life of the refrigerator.

Compared with the prototype, wetting the surface of the condenser with melt water in the claimed method is more efficient, because the large surface of the coil is wetted and no pump is required to pump the melt water up. Implementation of the inventive method for cooling a condenser allows the construction of small-sized condensers and significantly reduce energy consumption, especially at elevated ambient temperatures. The inventive method of cooling the condenser provides for the possibility of blowing the surface of the coil of the condenser and the groove with air from the fan.

List of sources used

1. Weinberg VB Vine V.P. Household compression refrigerators - M: food industry, 1974, S.99-101.

2. Patent RU No. 2162576 C2 2001.01.27 The device of the refrigeration unit of a household compression refrigerator.

3. Patent RU No. 2458291 METHOD FOR COOLING A COMPRESSOR REFRIGERATOR CONDENSER Published: 08/10/2012 Bul. No. 22).

4. Patent RU No. 2 455586. METHOD FOR COOLING A COMPRESSION REFRIGERATOR CONDENSER (OPTIONS, Published: July 10, 2012 Bul. No. 19).

5. Patent RU No. 2429431 BSH BOSCH UND SIEMENS HOUSGERETE GMBH (DE) DEVICE FOR EVAPORATION OF MELT WATER, ASSEMBLED IN A TRAY FOR MELT WATER, AND A REFRIGERATOR WITH SUCH A DEVICE. Published: September 20, 2011.

Claims (1)

A method of cooling a condenser of a compression refrigerator, including the use of melt water to moisten the surface of the condenser, characterized in that the water is directed from the melt water collector in the refrigerator or another source of water in the refrigerator to a groove, in the middle of which there is a condenser coil tube, while the water flows by gravity flows down the inclined grooves of the groove, moistening the surface of the groove and the condenser tube, and the remnants of melt water are sent to the container on the compressor.

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