Improvement of domestic CO_2 air conditioner by integrating compressor/expander combination

压缩机/膨胀机组合对家用CO_2空调的改进

• 批准号: 16560181
• 负责人: FUKUTA Mitsuhiro
• 金额: $ 1.98万
• 依托单位: Shizuoka University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2004
• 资助国家: 日本
• 起止时间: 2004 至 2006
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-16560181/
• 关键词: Global warming; Natural refrigerant; Carbon dioxide; Expander; Refrigeration cycle; 膨脹機

As an attempt of increasing the energy efficiency of a refrigeration cycle working with carbon dioxide by recovering a throttling loss, basic performances of a vane type expander and a scroll type expander were clarified and trans-critical leakage flow occurring in the expander and performance of a cycle with an expander/compressor combination were examined in this study.The total efficiency of the vane expander is 59% by optimization of clearances and a reduction of a shaft seal. The trans-critical expansion process changes according to an inlet temperature of the expander, and although a delay of flash is observed when the inlet temperature is low, good performance is obtained over the range of tested temperature. The scroll expander which was made using a scroll compressor element without major modification shows the total efficiency of 56% and a potential of having enough efficiency with an optimized design. The trans-critical leakage flow was examined experimentally using a channel model and it can be analyzed by a homogenous flow model with taking account of inlet acceleration, frictional loss and acceleration loss in the leakage clearance although an improvement of the model is needed when the leakage becomes choked flow. In addition, a prototype of compressor/expander combined machine was developed and its operating characteristics were measured. Operating balance point and the performance of the cycle with the combined machine were examined with considering the performances of expander and compressor. An improvement of cycle performance is obtained by 21% compared to a cycle with an expansion valve. Although the cycle performance decreases under off-design conditions, the performance will be improved by a bypass or a pre-expansion. In this study, a superior compressor/expander combined machine was not developed yet. But achievements of this study show feasibility of a CO_2 air conditioning system.

作为通过恢复节流损失来提高使用二氧化碳的制冷循环的能量效率的尝试，阐明了叶片式膨胀机和涡旋式膨胀机的基本性能，以及膨胀机中发生的跨临界泄漏流和膨胀机的性能。本研究检查了膨胀机/压缩机组合的循环。通过优化间隙和减少轴密封，叶片膨胀机的总效率为 59%。跨临界膨胀过程根据膨胀机的入口温度而变化，尽管当入口温度较低时观察到闪蒸延迟，但在测试温度范围内获得了良好的性能。使用涡旋压缩机元件而无需进行重大改造而制成的涡旋膨胀机显示出总效率为56％，并且通过优化设计具有足够的效率的潜力。使用通道模型对跨临界泄漏流进行了实验检验，并且可以通过考虑入口加速度、摩擦损失和泄漏间隙中的加速度损失的均质流模型进行分析，尽管当泄漏时需要对模型进行改进成为阻塞流。此外，还开发了压缩机/膨胀机组合机原型并测量了其运行特性。考虑膨胀机和压缩机的性能，检查了组合机的运行平衡点和循环性能。与带有膨胀阀的循环相比，循环性能提高了 21%。尽管在非设计条件下循环性能会下降，但通过旁路或预膨胀可以提高性能。在这项研究中，尚未开发出性能优越的压缩机/膨胀机组合机。但这项研究成果表明了CO_2空调系统的可行性。

项目成果

PERFORMANCE OF C02 REFRIGERATION CYCLE USING COMPRESSOR/EXPANDER COMBINATION

使用压缩机/膨胀机组合的 C02 制冷循环的性能

• 发表时间: 2006
• 期刊: Proc. of JSSUME 2006
• 作者: Nobuhiro HIMENO;Chihiro MASUDA;Shigeru HINATA;Mitsuhiro Fukuta;Mitsuhiro Fukuta;Seiji Nakaya
• 通讯作者: Seiji Nakaya

Performance of Scroll expander for C02 Refrigeration Cycle

C02制冷循环涡旋膨胀机性能

• 发表时间: 2006
• 期刊: Proc. of 18th Int. Compressor conference at Purdue
• 作者: Nobuhiro HIMENO;Chihiro MASUDA;Shigeru HINATA;Mitsuhiro Fukuta;Mitsuhiro Fukuta
• 通讯作者: Mitsuhiro Fukuta

INFLUENCE OF OIL SUPPLYING METHOD ON PERFORMANCE OF CO2 VANE TYPE EXPANDER

供油方式对CO2叶片式膨胀机性能的影响

• 发表时间: 2006
• 期刊: Proc. of JSSUME 2006 TF06
• 作者: Nobuhiro HIMENO;Chihiro MASUDA;Shigeru HINATA;Mitsuhiro Fukuta;Mitsuhiro Fukuta;Seiji Nakaya;Tomoaki Ogiso;Mitsuhiro Fukuta;Mitsuhiro Fukuta;Seiji Nakaya;Tomoaki Ogiso
• 通讯作者: Tomoaki Ogiso

二酸化炭素冷凍サイクルにおける膨張/圧縮機の運転特性

二氧化碳制冷循环膨胀机/压缩机的运行特性

• 期刊: 日本冷凍空調学会論文集 (投稿中)
• 作者: Nobuhiro HIMENO;Chihiro MASUDA;Shigeru HINATA;Mitsuhiro Fukuta;Mitsuhiro Fukuta;Seiji Nakaya;Tomoaki Ogiso;Mitsuhiro Fukuta;Mitsuhiro Fukuta;Seiji Nakaya;Tomoaki Ogiso;Mitsuhiro Fukuta;Mitsuhiro Fukuta;Seiji Nakaya;Tomoaki Ogiso;小須田 修;金 春日;Osamu Kosuda;Jin Chun Ri;金 春日;Mitsuhiro Fukuta;Mitsuhiro Fukuta;Mitsuhiro Fukuta;福田 充宏
• 通讯作者: 福田 充宏

Operating characteristics of expander/compressor combination for carbon dioxide refrigeration cycle

二氧化碳制冷循环膨胀机/压缩机组合的运行特性

• 期刊: Trans. of JSRAE, Submitted
• 作者: Nobuhiro HIMENO;Chihiro MASUDA;Shigeru HINATA;Mitsuhiro Fukuta;Mitsuhiro Fukuta;Seiji Nakaya;Tomoaki Ogiso;Mitsuhiro Fukuta;Mitsuhiro Fukuta;Seiji Nakaya;Tomoaki Ogiso;Mitsuhiro Fukuta;Mitsuhiro Fukuta;Seiji Nakaya;Tomoaki Ogiso;小須田 修;金 春日;Osamu Kosuda;Jin Chun Ri;金 春日;Mitsuhiro Fukuta;Mitsuhiro Fukuta
• 通讯作者: Mitsuhiro Fukuta