本研究透過計算流體力學之數值模擬分析方法針對螺旋板式熱交換器於高溫固態燃料電池系統之熱傳現象與熱效率分析，並分別探討在不同圈數、不同入口雷諾數以及不同SOFC+GT化學組成成分。由於螺旋板式熱交換器有許多優點，例如：高效能熱傳、結構緊湊、佔地面積小、自清潔能力以及耐高溫高壓等，提升固態氧化物燃料電池系統之熱效率其包括SOFC+GT化學組成成分、圈數。針對SOFC+GT化學組成成分部分，其調整操作溫度以及壓力等；針對流道設計部分則是影響熱交換器熱傳效率。因此本文將討論螺旋板式熱交換器於高溫固態燃料電池系統之熱傳現象與熱效率分析。
根據本研究結果可得知，對於不同圈數的影響，以case2為例，當熱交換器圈數從3圈增加至6圈以及9圈時，總熱傳率分別從287.6 W增加至353.4 W和388.2 W。由於熱交換器之總表面積增加，圈數為9圈之表面積具有較多的接觸面積，使得熱量可以更有效地從一側傳遞到另一側。針對平均Nusselt Number而言，圈數為3圈時之平均Nusselt Number為55.8，圈數為6圈時增加至67.3，圈數為9圈時增加至73.8。由此可知，隨圈數增加效率亦隨之提升。在不同雷諾數之影響部分，雷諾數從1000至4000的範圍內，對流熱傳係數明顯增加。雷諾數為1000時，對流熱傳係數為12.5 W/m²-K，當雷諾數分別增加至2000、3000和4000時，對流熱傳係數分別增加至18.4 W/m²-K、24.2 W/m²-K和29.7 W/m²-K，雷諾數為4000相較於雷諾數為1000時之提升約為2.38倍。

This research employs numerical simulation analysis through computational fluid dynamics (CFD) to investigate the heat transfer phenomena and thermal efficiency of a spiral plate heat exchanger within a high-temperature solid oxide fuel cell (SOFC) system. The analysis explores the effects of different turn numbers, various inlet Reynolds numbers, and different SOFC+GT chemical compositions. The spiral plate heat exchanger is known for its many advantages, such as high heat transfer efficiency, compact structure, small footprint, self-cleaning capability, and resistance to high temperatures and pressures, making it ideal for enhancing the thermal efficiency of SOFC systems, including SOFC+GT chemical compositions and turn numbers. The SOFC+GT chemical composition analysis involves adjustments to operating temperatures and pressures, while the channel design impacts the heat exchanger's heat transfer efficiency. Therefore, this paper discusses the heat transfer phenomena and thermal efficiency analysis of a spiral plate heat exchanger in a high-temperature SOFC system.
According to the results of this research , the impact of the number of coils is evident. For example, in Case 2, when the number of coils in the heat exchanger increases from 3 to 6 and 9, the total heat transfer rate increases from 287.6 W to 353.4 W and 388.2 W, respectively. This is attributed to the increase in the total surface area of the heat exchanger. The surface area for 9 coils provides a larger contact area, allowing heat to be transferred more effectively from one side to the other. Regarding the average Nusselt number, it increases from 55.8 with 3 coils to 67.3 with 6 coils, and further to 73.8 with 9 coils. This indicates that the efficiency improves with an increase in the number of coils. In terms of Reynolds number effects, within the range of Reynolds numbers from 1000 to 4000, the convective heat transfer coefficient increases significantly. At a Reynolds number of 1000, the convective heat transfer coefficient is 12.5 W/m²-K. As the Reynolds number increases to 2000, 3000, and 4000, the convective heat transfer coefficient increases to 18.4 W/m²-K, 24.2 W/m²-K, and 29.7 W/m²-K, respectively. The enhancement in the convective heat transfer coefficient from a Reynolds number of 1000 to 4000 is approximately 2.38 times.

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