Effect of dynamic characteristics on the performance of a free-piston Stirling heat-driven cooler

IF 6.1 2区工程技术 Q2 ENERGY & FUELS

Applied Thermal Engineering Pub Date : 2025-05-11 DOI:10.1016/j.applthermaleng.2025.126795

Hang-Suin Yang, Shu-Yi Kuan, Muhammad Aon Ali

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引用次数: 0

Abstract

A duplex-type free-piston Stirling heat-driven cooler (FPSHC) integrates a free-piston Stirling engine with a free-piston Stirling cooler. An FPSHC can simultaneously provide cooling capacity, heating capacity, and electrical power using external heat sources. In this study, a model is proposed to analyse the performance of FPSHCs. The model simulates the variations in the thermal properties of the working fluid within the FPSHC. The temperature distribution along the system’s wall boundary is constructed, and the volume variations in the working space are determined by solving the equations of motion for the displacers and piston. The model predicts performance parameters, including the phase angle and amplitude of the moving parts, operating frequency, cooling capacity, cooling temperature, and coefficient of performance (COP) of the FPSHC. Additionally, the effects of the natural frequency of the displacers and piston on the FPSHC’s performance are studied. The results show that the maximum COP can reach 0.1 as the natural frequency of the engine’s displacer is 25.52 Hz. To validate the proposed model, a prototype FPSHC is tested. Experimental results indicate that the FPSHC can achieve a cooling temperature of 259 K at a helium pressure of 4 bar and a heating temperature of 723 K. Furthermore, the cooling capacity, COP, and second-law efficiency of the FPSHC can reach 60 W, 0.107, and 25.8 %, respectively.

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动态特性对自由活塞斯特林热驱动冷却器性能的影响

双活塞斯特林热驱动冷却器（FPSHC）集成了自由活塞斯特林发动机和自由活塞斯特林冷却器。FPSHC可以同时提供冷却能力、加热能力和使用外部热源的电力。在本研究中，提出了一个模型来分析FPSHCs的性能。该模型模拟了FPSHC内工作流体热性质的变化。构造了沿系统壁面边界的温度分布，并通过求解位移器和活塞的运动方程确定了工作空间内的体积变化。该模型预测了FPSHC的性能参数，包括运动部件的相角和幅值、工作频率、制冷量、冷却温度和性能系数（COP）。此外，还研究了换能器和活塞的固有频率对FPSHC性能的影响。结果表明，当发动机排气量固有频率为25.52 Hz时，最大COP可达0.1。为了验证所提出的模型，测试了一个原型FPSHC。实验结果表明，在4 bar的氦压力下，FPSHC可以达到259k的冷却温度和723k的加热温度。其制冷量可达60 W， COP可达0.107 W，第二定律效率可达25.8%。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Applied Thermal Engineering 工程技术-工程：机械

CiteScore

11.30

自引率

15.60%

发文量

1474

审稿时长

57 days

期刊介绍： Applied Thermal Engineering disseminates novel research related to the design, development and demonstration of components, devices, equipment, technologies and systems involving thermal processes for the production, storage, utilization and conservation of energy, with a focus on engineering application. The journal publishes high-quality and high-impact Original Research Articles, Review Articles, Short Communications and Letters to the Editor on cutting-edge innovations in research, and recent advances or issues of interest to the thermal engineering community.