Thermodynamics analysis on a heat exchanger unit during the transient processes based on the second law

Chaoyang Wang, Ming Liu, Yongliang Zhao, Zhu Wang and Junjie Yan

Energy, 2018, vol. 165, issue PB, 622-633

Abstract: Diminishing fossil fuel resources have intensified the need for energy saving. Heat transfer is a basic method of energy delivery and convention, and heat transfer during the transient processes may be affected by the dynamic performances of heaters. Analysis of the heater performances during the transient process based on the second law of thermodynamics may show the room for the improvement in energy saving. Variations of boundaries, such as the flow rates and temperatures of the work fluids, may affect the dynamic behaviors of heaters. The variation rates, formats and ranges of the inlet work fluids flow rates and temperatures on the irreversibility and exergy delivery characteristics are discussed in this paper. The average exergy efficiency (ηE,avg) of the heater during the transient process with different operational parameters are presented and compared. The results show that, in the identical variation range, the maximum difference in ηE,avg with different flow rates and temperature variation rates of the cold work fluid are 0.3% and 0.4%, respectively. With step variation format, the maximum difference in ηE,avg for the different variation ranges of the cold work fluid is 0.85%.

Keywords: Heat exchanger; Energy saving; Transient processes; Entropy generation; Exergetic efficiency (search for similar items in EconPapers)
Date: 2018
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (6)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:165:y:2018:i:pb:p:622-633

DOI: 10.1016/j.energy.2018.09.189

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