| 摘要: |
| 离心式逆布雷顿循环（CRBC）是一种利用离心力势能-压力能转换的制冷循环，工质在旋转管内的离心和向心流动实现高效压缩和膨胀过程，为提升气体制冷循环的效率提供了潜在可能性。本文以二氧化碳为制冷工质，水为冷却介质，建立离心式逆布雷顿制冷系统的热力学模型，并进行?分析，以探究系统的?效率及?损分布情况，为系统的评估及改进提供理论依据。研究结果表明，在相同送风温度下，加热器进口温度存在优化可能，系统最大?损率出现在离心等温压缩、绝热压缩和向心绝热膨胀流动过程，分别约在20%左右，空气冷却过程和离心绝热压缩流动过程的?损率较小且与加热器进口温度呈相反变化趋势。离心式逆布雷顿循环的?效高达19.2%，远高于CO2逆布雷顿循环的8.1%、开式空气逆布雷顿循环的4.9%和闭式空气逆布雷顿循环的2.3%。 |
| 关键词: 逆布雷顿循环 二氧化碳制冷循环 超重力场 ?分析 |
| DOI： |
| Received:August 07, 2023Revised:October 19, 2023 |
| 基金项目: |
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| Exergy Analysis of CO2 Centrifugal Reverse Brayton Cycle |
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| Abstract: |
| The Centrifugal Reverse Brayton Cycle (CRBC) is a novel refrigeration cycle that harnesses the conversion of inertial potential energy to pressure energy, enabling efficient compression and expansion processes through the centrifugal and centripetal flow of the working fluid within a rotating tube. This offers a promising potential for improving the refrigeration efficiency of conventional gas refrigeration cycles. Building upon earlier research, this study employs a thermodynamic model to conduct a parametric analysis of the CRBC, with the aim of exploring the cycle"s thermodynamic efficiency and loss distribution, providing a theoretical foundation for system evaluation and enhancement. This research reveals that, under the same inlet air temperature, there exists an optimization possibility for the heater inlet temperature. The system experiences its maximum exergy loss rate during the centrifugal isothermal compression flow, adiabatic compression, and centripetal adiabatic expansion flow, each approximately at 20%. Conversely, the exergy loss rates during the air cooling process and centrifugal adiabatic compression flow are comparatively lower and demonstrate an inverse relationship with the inlet temperature of gas heater. The exergy efficiency of the CRBC reaches an impressive 19.2%, significantly surpassing the 8.1% for CO2 Reverse Brayton Cycle, 4.9% for open air Reverse Brayton Cycle, and 2.3% for closed air Reverse Brayton Cycle. |
| Key words: reverse brayton cycle CO2 refrigeration cycle super-gravity field exergy analysis |
