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Improved assessment of energy efficiency for plate heat exchanger grading

Author

Listed:
  • Chen, Yilong
  • Zhou, Wenxue
  • Gao, Liping
  • Sun, Lili
  • Bai, Bofeng

Abstract

Quantitatively evaluating and grading the energy efficiency of heat exchangers is of pivotal for energy conservation and emission reduction in the industrial fields. This improved study is to modify our theory on the grading index of the Energy Efficiency Index (EEI) based on an extended database of plate heat exchangers (PHEs). Firstly, the basic requirements for energy efficiency evaluation of heat exchanger grading are discussed. Subsequently, the expression of the EEI is revised to accommodate heat exchangers with non-uniform structures, and the physical significance of the pressure gradient exponent n is investigated. By establishing a new database of 451 plate heat exchangers, a comparison with other evaluation methodologies rooted in the first and the second law methods validate our grading theory and its stability. The energy efficiency distribution of the PHEs in the database is then obtained, allowing for the grading and categorization of the PHEs. Notably, replacing lower-grade exchangers with high ones achieves a remarkable reduction of 55.2 % in pump power consumption. This improved grading method can serve as a classification standard for energy-saving policies, and thereby facilitate energy conservation and emission reduction in the heat exchanger industry.

Suggested Citation

  • Chen, Yilong & Zhou, Wenxue & Gao, Liping & Sun, Lili & Bai, Bofeng, 2024. "Improved assessment of energy efficiency for plate heat exchanger grading," Energy, Elsevier, vol. 313(C).
    • Handle: RePEc:eee:energy:v:313:y:2024:i:c:s0360544224038581
    DOI: 10.1016/j.energy.2024.134080
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