CFD Analysis on the Performance of Twisted Tapes in Horizontal Heat Exchangers for Shower Water Heat Recovery | ||
| Journal of Heat and Mass Transfer Research | ||
| دوره 12، شماره 1 - شماره پیاپی 23، مرداد 2025، صفحه 137-150 اصل مقاله (783.69 K) | ||
| نوع مقاله: Full Length Research Article | ||
| شناسه دیجیتال (DOI): 10.22075/jhmtr.2024.35215.1604 | ||
| نویسندگان | ||
| Eduardo Silva1؛ Vitor Ferreira2؛ José Cunha2؛ Eliseu Monteiro* 1، 2 | ||
| 1Faculty of Engineering, University of Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal | ||
| 2LAETA-INEGI, Associated Laboratory for Energy, Transports and Aeronautics- Institute of Science and Innovation in Mechanical and Industrial Engineering, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal | ||
| چکیده | ||
| The thermal energy found in shower hot wastewater, which is usually dumped, can be recovered through heat exchangers and used to pre-heat shower cold-water, contributing to energy sustainability. The objective and novelty of this work are to present a computational fluid dynamics (CFD) model and a theoretical model based on literature correlations to evaluate the performance of a shower water horizontal heat exchanger with twisted tape inserts. CFD simulations are used to improve the shape of twisted tape in the setting of the turbulator. The findings suggest that the wastewater flow convection heat transfer coefficient is between the flow around a cylinder and the flow around a cylinder in a narrow channel. The results for the turbulator are consistent with theoretical data, except for twist ratios below 3. The most promising twisted tape design has a twist ratio of 4 and a thickness of 1 mm. A conclusion could be drawn that the efficacy of the twisted tape in the heat exchanger is greater at lower flow rates. The performance gain ranges from 18.1 % to 3.0 % for flow rates of 3–10 L/min. Future directions for this research should focus on the improvement of the external convection coefficient because it represents the highest thermal resistance in the shower wastewater horizontal heat exchanger. | ||
| کلیدواژهها | ||
| Computational fluid dynamics؛ Convection؛ Energy sustainability؛ Wastewater heat exchanger؛ Twisted tape | ||
| مراجع | ||
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