Heat exchanger network energy efficiency evaluation method based on principal component analysis

Abstract

Provided is a heat exchanger network energy efficiency evaluation method based on principal component analysis. The method adopts a principal component analysis method to establish a heat exchanger comprehensive assessment model, and carries out grading evaluation on energy efficiency of heat exchangers by using the comprehensive assessment model, wherein the step of adopting the principal component analysis method to establish the heat exchanger comprehensive assessment model comprises the following steps: selecting evaluation factor variables of the heat exchangers; carrying out KMO detection and SMC detection on the selected evaluation factor variables; carrying out standardization on the evaluation factor variables obtained after detection; establishing a sample correlation matrix and calculating feature values and feature vectors of the correlation matrix; determining the number of evaluation sample principal components according to accumulated contribution rate; obtaining a standardized principal component module through linear combination of the feature vectors and standardized evaluation factor variables; establishing the heat exchanger comprehensive assessment model according to principal component weight; and calculating comprehensive evaluation points of the energy efficiency of the heat exchangers, and determining a heat exchanger energy efficiency grade division score range table. The method can carry out evaluation on a heat exchanger network or the single heat exchanger, thereby preventing blindness of heat exchanger evaluation.

Description

technical field [0001] The invention relates to a method for evaluating the energy efficiency of a heat exchanger network. In particular, it relates to a method for evaluating the energy efficiency of a heat exchanger network based on principal component analysis. Background technique [0002] Heat exchangers are important equipment for heat exchange and energy transfer in the production process of the petrochemical industry. After long-term use, the heat transfer capacity of the heat exchanger will decrease, which will cause serious corrosion and leakage, which will lead to unplanned maintenance or shutdown of the device, resulting in serious waste of resources. Therefore, the energy efficiency of the heat exchanger is evaluated to provide The transformation, selection, maintenance and application of heaters are instructive. [0003] In the research of heat exchanger energy efficiency evaluation method, it often involves the temperature difference between the inlet and ou...

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Problems solved by technology

At the same time, because there is a certain correlation between the evaluation factor variables, the information covered by these factor variables overlaps to a certain extent.

[0005] At present, there are many evaluation methods for the performance of heat exchangers. One is to evaluate the heat exchange performance of the heat exchanger in operation in real time. The consideration factors are relatively single and cannot fully reflect the energy efficiency of the heat exchanger itself; the other uses a comprehensive evaluation method. , mainly using Delphi (De Phil method) or Analytic Hierarchy Process (AHP) to carry out factor weighting, this process fails to eliminate the collinearity among various factors, and there is subjectivity in weight determination

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