Influence of fins on heat transfer during boiling of an aqueous solution of lithium bromide in the generator of an absorption heat converter

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Abstract

Heat exchange during boiling of aqueous solutions of lithium bromide of different concentrations in bare and finned tubes in large volume has been investigated. It is shown that the heat exchange coefficient during boiling in finned tube is 15—20 % higher than in bare tube. Empirical relationships of heat transfer coefficients during boiling in bare andfinned tube have been obtained. These studies show that finned tubes can be recommended for use in generators of absorption lithium bromide heat transformers.

About the authors

R. M. Minevtsev

St. Petersburg State University of Low Temperature and Food

Author for correspondence.
Email: info@eco-vector.com
Russian Federation

O. V. Volkova

St. Petersburg State University of Low Temperature and Food

Email: info@eco-vector.com
Russian Federation

A. V. Baranenko

St. Petersburg State University of Low Temperature and Food

Email: info@eco-vector.com
Russian Federation

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2. Rice. Fig. 1. Dependence of the heat transfer coefficient a on the heat flux density q during boiling of an aqueous solution of lithium bromide with a concentration of 60%, according to various authors: 1 — steel pipe with an outer diameter dHap = 25 mm [6]; 2 - cylinder made of steel 20 with dHap - 20 mm [2]; 3 - smooth pipe from MNZh Mts 30-1-1 cdpar = 16 mm

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3. Rice. 2. Comparison of experimental data for boiling an aqueous solution of lithium bromide on smooth and finned tubes

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4. Rice. 3. Generalization of experimental data during boiling of an aqueous solution of lithium bromide on a smooth pipe made of copper-nickel alloy grade MNZh-Mts 30-1-1

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5. Rice. 4. Generalization of experimental data for boiling distilled water and an aqueous solution of lithium bromide on a finned tube made of copper-nickel alloy MNZh-Mts 30-1-1

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Copyright (c) 2022 Minevtsev R.M., Volkova O.V., Baranenko A.V.

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