Heat exchanger performance evaluation method based on three-field cooperation of fluid temperature, pressure and flow field

Abstract

A heat exchanger performance evaluation method based on three-field cooperation of fluid temperature, pressure and flow field comprises: selecting a reference heat exchanger, determining a criterion relation between a reference heat exchanger resistance coefficient and a Reynolds number under the cold working condition, obtaining a characteristic relational expression of a heat exchange capacity ratio of a heat exchanger to a reference heat exchanger for comparison under the conditions of equal pump work, equal pressure drop and equal flow, expressing the characteristic relational expression as three straight lines passing through points (1, 1) in a rectangular coordinate system under three constraint conditions of an equal pump work condition, an equal pressure drop condition and an equalflow condition, and dividing a working area into four parts to obtain a performance evaluation chart, and determining and comparing the heat exchange performance of the heat exchanger according to the positions of the working condition points in the four subareas. Through the division of the four subareas, different enhanced heat exchange technologies can be qualitatively compared and analyzed conveniently and quickly, and whether the enhanced heat exchange technologies are truly energy-saving or not can be quantitatively judged; and the energy-saving efficiency of the enhanced heat exchangetechnology at different working points and the energy-saving efficiency of different enhanced heat exchange technologies are visually compared.

Description

technical field [0001] The invention belongs to the technical field of heat transfer optimization of heat exchangers, in particular to a heat exchanger performance evaluation method based on the coordination of fluid temperature, pressure and flow field. Background technique [0002] As a common heat exchange device, heat exchangers are widely used in various fields of production practice, such as economizers in thermal power stations, flue gas waste heat recovery devices, air-conditioning condensers and evaporators, radiators for electronic equipment, and chemical equipment heat exchanger etc. As an important component of industrial production, the type, size and efficiency of heat exchangers are constantly improving along with the development of the industry. Especially in the era of energy saving and emission reduction, reducing energy consumption and improving the heat exchange efficiency of heat exchangers has become a hot spot in the industry. The thermal resistance ...

AI Technical Summary

Problems solved by technology

However, most of the performance evaluation indicators of these heat exchange equipment are qualitative analysis of heat exchange performance and resistance, and it is impossible to quantitatively judge whether the enhanced heat exchange technology really achieves the purpose of energy saving

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