新型分叉翅片强化管壳式储能罐储热性能

doi:10.19799/j.cnki.2095-4239.2022.0501

摘要/Abstract

摘要：

针对相变材料的质量和最大储热能力因翅片占据相变储能装置的部分体积而下降的问题，实现翅片结构优化具有重要意义。本工作在传统纵向翅片的基础上根据分叉形状提出了一种新型翅片来提高管壳式相变储能罐的储热性能，并针对该装置中相变材料带自然对流的熔化过程进行了三维数值模拟研究，分析了翅片数量、传热流体的入口温度和流速对相变材料熔化过程的影响。研究结果表明：与具有同等体积和数量的纵向翅片相比，新型分叉翅片显著加快了管壳式相变储能罐的蓄热过程。与无翅片和纵向翅片相比，新型分叉翅片使相变材料的熔化时间分别缩短了59.9%和23.4%，平均储热速率分别提高了142.1%和31.4%。在不改变翅片体积的前提下，增加翅片的数量可以减少相变材料的熔化时间，提高平均储热速率，但当翅片数量超过6时，对储热性能的进一步改善效果不明显。提高传热流体的入口温度和流速不仅可以缩短相变材料的熔化时间，也可以增加总储热量和平均储热速率。研究结果可为管壳式储能装置的结构优化和太阳能的高效利用提供一定的参考价值。

关键词: 翅片, 储能装置, 相变材料, 储热性能

Abstract:

The issue that the quality and maximum heat storage capacity of the phase-change material (PCM) are diminished as a result of the fins taking up some of the volume of the phase-change energy storage device is one that must be addressed by optimizing the fin structure. To improve the heat storage capacity of the shell-and-tube phase-change energy storage tank, a new type of fin was developed according to the bifurcated shape based on the conventional longitudinal fin, and a three-dimensional numerical simulation of the PCM melting process with natural convection in the device was carried out. The effects of the heat transfer fluid's inlet temperature, flow rate, and fin count on the melting of PCM have been examined in detail. The findings demonstrate that, in comparison with the longitudinal fin of the same volume and number, the new bifurcated fin greatly speeds up the heat storage process in the shell-and-tube phase-change energy storage tank. The new bifurcated fins increased average heat storage rate by 142.1% and 31.4%, respectively, while reducing PCM melting time by 59.9% and 23.4%, respectively, compared to longitudinal fins and no fins. Increasing the number of fins can decrease PCM's melting time and increase average heat storage rate without changing the volume of fins. However, there is no further gain in heat storage performance when the number of fins is greater than 6. Shortening the PCM melting time and increasing the total and the average heat storage rates can be accomplished by raising the heat transfer fluid's inlet temperature and flow rate. The results can offer a specific reference value for the structural optimization of the shell-and-tube energy storage device and the effective exploitation of solar energy.

Key words: fin, energy storage device, phase change material, heat storage performance

中图分类号:

TK 02

毛前军, 朱元媛. 新型分叉翅片强化管壳式储能罐储热性能[J]. 储能科学与技术, 2023, 12(1): 69-78.

Qianjun MAO, Yuanyuan ZHU. Study on heat storage performance of novel bifurcated fins to strengthen shell-and-tube energy storage tanks[J]. Energy Storage Science and Technology, 2023, 12(1): 69-78.

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物理参数	石蜡	铜
密度ρ/(kg/m³)	885	8978
导热系数k/(W/m·K)	0.279	387.6
比热容c_p /(J/kg·K)	2000	381
相变潜热L/(J/kg)	172620	/
固相点T_s/K	321	/
液相点T_l/K	323	/
动力黏度μ/(Pa·s)	1.72e-05	/
热膨胀系数β/K^-1	0.0006	/

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