Copper heat-exchanging pipe of condenser for bromine refrigerator set

Abstract

A copper heat-exchange tube for condensers of bromide refrigerating units is made up of at least one set of adjacent polish rod part and fins part. On the outside surface of the fins part are disposed continuous single-spiral fins and the section of the fin is triangle. The ratio of the fin width to the width of the fin slot bottom is 1 / 3-1 / 5, so as to extend the cooling area of the heat-exchange tube.

Description

technical field [0001] The invention relates to a copper tube, in particular to a copper heat exchange tube used in a condenser of a bromine refrigeration unit. Background technique [0002] Since June 1990 in London, England, it was determined to advance the timetable for restricting the use of CFC (Cholrofluorocarbons, freon). Developed countries are not allowed to use it before 2000, and developing countries can extend it for another 10 years. There is no research and application of CFC substitutes. With rapid development, green and environmentally friendly non-CFC substitutes have gradually been widely used, and lithium bromide absorption refrigerators are one of them. With the advancement of science and technology, the continuous innovation of new technologies and new methods has made lithium bromide refrigerators develop towards high efficiency, miniaturization, and light weight. The condenser tube, which is a key component of refrigeration in lithium bromide absorptio...

AI Technical Summary

Problems solved by technology

At present, the condenser tubes produced by the existing technology are generally copper smooth tubes or other improved heat exchange tubes based on this, which can no longer fully meet the requirements of improving efficiency, reducing costs, and saving energy.

The existing condenser tubes mainly have the following defects: 1. Most of the copper tubes produced in the prior art are copper tubes specially used for non-lithium bromide absorption refrigerators, which are not suitable for the flow law of the fluid in the lithium bromide absorption refrigerator, so the heat transfer performance and The energy exchange is unreasonable and the efficiency is low; 2. Although some heat exchange tubes have improved heat transfer efficiency compared with ordinary smooth copper tubes, they increase the overall weight of the unit and increase the overall manufacturing cost; Thin, high teeth, light weight, larger unit heat transfer area, but poor fatigue resistance, easy to leak, easily affect the service life of the unit, and the cost is high, so the calculation of the mass-to-performance ratio of the existing heat exchange tubes is unreasonable; 3. For cold-rolled tubes with low fins, the fin height of the outer fins of the tubes is currently below 1.0mm, and there is no fin height above 1.4mm on the basis of the bottom wall below 1.2mm, so the heat dissipation area of ​​the fins is small , which is not conducive to improving the heat dissipation efficiency; 4. At present, the length of the transition part with incomplete fins between the smooth surface of the tube and the surface with fins is about 60mm, and the greater the transition length of the incomplete fins, the incomplete The more fins there are, the more unfavorable it is to improve the condensation performance; 5. In the case of refrigerant condensation, the thicker the continuous liquid refrigerant film formed by the condensed refrigerant on the outer surface of the heat transfer tube, the heat transfer The lower the heat transfer efficiency of the tube, and the cross-section of the fins of the current heat exchange tubes is trapezoidal, the refrigerant is not easy to slide down on the fins, and a thicker liquid refrigerant film is formed on the outer surface of the heat exchange tubes. , so it is not conducive to improving the heat transfer efficiency

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