Copper evaporating heat-exchanging pipe of evaporator for bromine refrigerator set

Abstract

A copper evaporation heat-exchange tube for evaporators of bromide refrigerating units comprises a fin part and polish rod parts at two ends of the fin part. On the fin part are disposed single-spiral fins and on the fins are opened secondary slots. The ratio of the fin width to the width of the fin slot bottom is 0.25-0.38.

Description

technical field [0001] The invention relates to an evaporation heat exchange tube, in particular to a copper evaporation heat exchange tube used in an evaporator 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 refriger...

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. Some heat exchange tubes are equipped with a large number of blades (that is, thin fins) on ordinary smooth copper tubes to increase the heat dissipation area, although the heat transfer efficiency is higher than that of ordinary smooth copper tubes. Improvement, but the assembly of fins on the heat exchange tube not only increases the cost, but also increases the overall weight of the heat exchange tube, and because the fins assembled on the heat exchange tube have thermal resistance, heat exchange cannot be performed effectively, so it cannot be quickly Reduce the temperature of the working medium in the heat exchange tube; 3. There are also some heat exchange tubes that process slightly trapezoidal fins on the light tube, and have grooves on the top surface of the fins, although trapezoidal fins with grooves The fin increases the heat dissipation area, but when the condensate drops to the groove on the fin, it will accumulate in the groove until the groove is full, so it is difficult to form a heat exchange film on the surface of the tube and reduce the heat exchange rate of the tube ; 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 60 mm, and the greater the transition length of the incomplete fins, the more incomplete fins, The more unfavorable it is to improve the condensation performance

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