Theoretical analysis and experimental validation of optimal vapor injection conditions for a low-pressure ratio scroll compressor

IF 6.4 2区工程技术 Q1 THERMODYNAMICS

Case Studies in Thermal Engineering Pub Date : 2024-11-12 DOI:10.1016/j.csite.2024.105485

Kang Li , Chunyu Li , Jian Cao , Ni Liu , Hua Zhang , Binlin Dou , Ran Tu , Qize He , Lin Su , Xuejin Zhou

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引用次数: 0

Abstract

This study investigates the impact of vapor injection parameters and positions on the performance of a low-pressure ratio scroll compressor in electric vehicle thermal management systems under extremely low temperatures. The research combines experimental and simulation methods to analyze five injection ports designed at different positions. Key performance metrics, including mass flow rate, discharge temperature (T_dis), coefficient of performance (COP), compression work, and heating capacity (Q_h) were evaluated under various conditions. A low-pressure ratio (scroll number N = 2) vapor injection scroll compressor was designed with an optimized injection port configuration. This design was rigorously validated through experimental results, confirming its efficacy. Notably, the findings reveal that the enhancement in Q_h and COP is more pronounced in extremely low-temperature working conditions compared to non-injection conditions, with improvements of 10.7 % and 4.6 %, respectively. Compressor performance increases with increasing vapor injection pressure, and compressor speed and performance increment are more significant under low-temperature working conditions. Finally, an injection coefficient, denoted as k, is proposed to determine the optimal injection pressure for diverse discharge and suction pressures in cold climates. According to the experimental results, the value of k associated with the best heating COP ranges between 0.65 and 0.85.

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低压比涡旋式压缩机最佳喷气条件的理论分析和实验验证

本研究探讨了在极低温度条件下，蒸汽喷射参数和位置对电动汽车热管理系统中低压比涡旋压缩机性能的影响。研究结合实验和模拟方法，对设计在不同位置的五个喷射口进行了分析。评估了各种条件下的关键性能指标，包括质量流量、排气温度 (Tdis)、性能系数 (COP)、压缩功和加热能力 (Qh)。设计的低压比（涡旋数 N = 2）喷气涡旋压缩机具有优化的喷气口配置。实验结果对该设计进行了严格验证，证实了其有效性。值得注意的是，研究结果表明，与非喷气条件相比，在极低温工作条件下，Qh 和 COP 的提高更为明显，分别提高了 10.7% 和 4.6%。压缩机性能随着蒸汽喷射压力的增加而提高，在低温工况下，压缩机速度和性能的提高更为显著。最后，还提出了一个喷气系数（用 k 表示），以确定在寒冷气候条件下不同排气和吸气压力下的最佳喷气压力。根据实验结果，与最佳加热 COP 相关的 k 值介于 0.65 和 0.85 之间。

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

Case Studies in Thermal Engineering Chemical Engineering-Fluid Flow and Transfer Processes

CiteScore

8.60

自引率

11.80%

发文量

812

审稿时长

76 days

期刊介绍： Case Studies in Thermal Engineering provides a forum for the rapid publication of short, structured Case Studies in Thermal Engineering and related Short Communications. It provides an essential compendium of case studies for researchers and practitioners in the field of thermal engineering and others who are interested in aspects of thermal engineering cases that could affect other engineering processes. The journal not only publishes new and novel case studies, but also provides a forum for the publication of high quality descriptions of classic thermal engineering problems. The scope of the journal includes case studies of thermal engineering problems in components, devices and systems using existing experimental and numerical techniques in the areas of mechanical, aerospace, chemical, medical, thermal management for electronics, heat exchangers, regeneration, solar thermal energy, thermal storage, building energy conservation, and power generation. Case studies of thermal problems in other areas will also be considered.