A design method of a shell-side boiling tube-side condensing coiled tube heat exchanger

By dividing the wound tube heat exchanger into multiple parts and using the finite volume method and a high-precision heat transfer coefficient calculation formula, the problem of design complexity of wound tube heat exchangers is solved, achieving efficient heat transfer and pressure drop optimization, and improving design accuracy and efficiency.

CN115392070BActive Publication Date: 2026-07-07ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
Filing Date
2022-08-01
Publication Date
2026-07-07

AI Technical Summary

Technical Problem

Existing spiral tube heat exchanger designs lack forward design methods, are computationally complex and have not reached international standards, making it difficult to achieve high-precision heat transfer calculations and pressure drop optimization.

Method used

Using the finite volume method and a high-precision heat transfer coefficient calculation formula, the heat exchanger is divided into a tube-side condensation-shell-side liquid phase section, a tube-side condensation-shell-side boiling section, and a tube-side condensation-shell-side gas phase section. The heat transfer, surface heat transfer coefficient, and pressure drop of each section are calculated separately, and coupled design is performed using programming tools.

Benefits of technology

It improves calculation accuracy and design efficiency, and realizes efficient heat transfer and pressure drop optimization of wound tube heat exchangers to meet the needs of industrial applications.

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Abstract

The application discloses a design method of a shell-boiling tube-condensing wound tube heat exchanger, according to the inlet and outlet temperatures of the tube and the shell, the dew point and bubble point of the working medium of the tube and the shell, the whole heat exchanger is divided into three parts, i.e. a tube-condensing shell-liquid section, a tube-condensing shell-boiling section and a tube-condensing shell-gas section, and the heat exchange capacity, the surface heat exchange coefficient of the tube and the shell, the comprehensive heat exchange coefficient, the pressure drop of the tube and the shell, the heat exchange area and the axial effective heat exchange length of the three parts of the wound tube heat exchanger are respectively designed and calculated; the tube is always in a gas-liquid mixed phase state of condensation phase change, the surface heat exchange coefficients of the tube and the shell are related to the dryness, therefore, the three parts of the wound tube heat exchanger are designed and calculated by using the finite volume method. The design method of the shell-boiling tube-condensing wound tube heat exchanger has the characteristics of high calculation precision, complete design method and high calculation efficiency, and has high commercial value and market promotion value.
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