Heat exchange enhancement surface comprehensive performance evaluation method
A comprehensive performance evaluation and enhanced heat transfer technology, applied in design optimization/simulation, special data processing applications, instruments, etc., can solve the problems of new enhanced surface restrictions, reference surface heat transfer and resistance correlation unknown, etc., to achieve simple and convenient increase sexual effect
Active Publication Date: 2019-03-26
XI AN JIAOTONG UNIV
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Problems solved by technology
However, in the process of developing a new enhanced surface, when performing parameter optimization on the enhanced surface or comparing limited data points for different surfaces, the heat transfer and resistance correlation of the reference surface is unknown
In addition, during the derivation of this method, some assumptions were introduced which, although widely adopted in the literature, limit the application of this evaluation method in the development of novel enhanced surfaces
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[0039] The method for evaluating the comprehensive performance of an enhanced heat exchange surface provided by the present invention will be further described in the following embodiments described in conjunction with the accompanying drawings.
[0040] A comprehensive performance evaluation method for an enhanced heat transfer surface of the present invention mainly includes the following steps:
[0041] (1) Define the key parameters required for the performance evaluation method:
[0042] Reynolds number: Pressure drop: Pump work: P=u m A c Δp, heat transfer: Q=c p ρu m A c ΔT
[0043] where u m is the flow velocity of the minimum flow section / m s -1 , d is the outer diameter of the heat exchange tube / mm, v is the kinematic viscosity of the heat exchange fluid / m 2 ·s -1 , ρ is the density of the fluid / kg m -3 , f is the drag coefficient, A c is the minimum cross-sectional area of free flow / m 2 , c p is the specific heat capacity of the fluid at constant p...
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The invention discloses a heat exchange enhancement surface comprehensive performance evaluation method. The method can be used for visualizing;, the energy-saving effects of different enhanced heat exchange technologies are clearly compared; performance evaluation can be carried out on the influence of different structure parameters on the energy-saving effect; Meanwhile, the performance of the enhanced heat exchange technology of limited data points can be evaluated without depending on the problems of reference surface heat transfer and resistance correlation, the slope of the working lineis a constant, the simplicity of engineering application is improved, and the method is suitable for development and engineering application of a novel enhanced heat exchange surface.
Description
technical field [0001] The invention belongs to the technical field of enhanced heat exchange for heat exchangers in industries such as energy, petroleum, chemical industry, and air conditioning, and relates to an evaluation method for heat exchange technology, in particular to an enhanced heat exchange technology for heat exchange elements such as heat exchange tube bundles, finned tubes, and heat exchange in tubes. A comprehensive evaluation method for heat transfer resistance characteristics, in particular to a comprehensive performance evaluation method for enhanced heat transfer surfaces. Background technique [0002] Energy is the strategic resource most concerned by all countries in the world, and the energy issue has become one of the important issues restricting the economic development of various countries. In 2016, China accounted for 23% of global energy consumption and 27% of global energy consumption growth, and remains the world's largest energy consumer. At t...
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IPC IPC(8): G06F17/50
CPCG06F30/17G06F30/20G06F2119/08
Inventor 何雅玲陶文铨汤松臻张凯李明佳
Owner XI AN JIAOTONG UNIV