A 2 kW-class free-piston Stirling heat pump prototype suitable for cold regions for domestic heating

Longran Dai, Kaiqi Luo, Yanlei Sun, Jianying Hu, Limin Zhang, Zhanghua Wu, Ercang Luo
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Abstract

Compared with conventional vapour-compression heat pump technology, the free-piston Stirling heat pump technology attracts wide attention for its high efficiency, reliability, and environmental friendliness. In this work, a free-piston Stirling heat pump prototype with a two-kilowatt capacity, which can operate with an outside ambient temperature ranging from -20 to 10 °C, was designed, built and tested. First, numerical simulations were carried out to explore the distributions of the acoustic field and exergy loss. Second, the effects of several operating parameters on the heating performance were numerically investigated in detail. Finally, to validate the accuracy of the simulation results, verification experiments were conducted on the experimental platform of a free-piston Stirling heat pump driven by a dual-opposed linear compressor. Experimental data show that with a hot-end temperature of 45 °C and outside ambient temperature of 0 °C, the prototype achieved a heating capacity of 2253 W with a corresponding COPh of 2.76 (based on PV power input) and a relative Carnot efficiency of 39.1%; in particular, the prototype was able to achieve a COPh of 2.5 when pumping heat from -20 °C to 45 °C for 3.25 MPa mean pressure. The simulation and experimental results demonstrated that the free-piston Stirling heat pump system has good potential to achieve high efficiency as a heating supply in a cold region.

适用于寒冷地区家庭供暖的 2 千瓦级自由活塞斯特林热泵样机
与传统的蒸汽压缩热泵技术相比,自由活塞式斯特林热泵技术因其高效、可靠和环保而受到广泛关注。在这项工作中,我们设计、制造并测试了一个自由活塞斯特林热泵原型,其功率为两千瓦,可在外部环境温度为-20 至 10 °C的条件下运行。首先,进行了数值模拟,以探索声场和能量损失的分布。其次,对几个运行参数对加热性能的影响进行了详细的数值研究。最后,为了验证模拟结果的准确性,在双对置线性压缩机驱动的自由活塞斯特林热泵实验平台上进行了验证实验。实验数据显示,在热端温度为 45 °C、外部环境温度为 0 °C 的条件下,原型机的制热能力为 2253 W,相应的 COPh 为 2.76(基于光伏输入功率),相对卡诺效率为 39.1%;特别是,在平均压力为 3.25 MPa 的条件下,原型机在将热量从 -20 °C 泵送至 45 °C 时的 COPh 为 2.5。模拟和实验结果表明,自由活塞式斯特林热泵系统具有在寒冷地区实现高效供热的良好潜力。
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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