HIGH PERFORMANCE TRANSCRITICAL HEAT PUMP CYCLE USING CARBON DIOXIDE AS A REFRIGERANT

使用二氧化碳作为制冷剂的高性能跨临界热泵循环

基本信息

批准号：
14350102
负责人：
HIHARA Eiji
金额：
$ 9.34万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2004
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-14350102/
关键词：
HEAT PUMP CARBON DIOXIDE COP EJECTOR HEAT EXCHANGER エジェクター

项目摘要

Research and development of the expansion power recovery mechanism called an ejector, which is expected to improve the COP of carbon dioxide heat pumps, were performed. Based on the research result to a supersonic nozzle, the whole ejector system was actually designed, the actual ejector type heat pump incorporating it was manufactured, the performance test was performed, and analysis to the experimental result was performed. The following things were clarified by these research results. First, the performance of ejector in an ejector cycle is determined from the balance of the pressure increase due to the shock wave, which is produced at the mixing part and the diffuser, and the pressure loss characteristics covering the whole passage of the suction flow, from an ejector exit to the suction part of ejector through a gas-liquid separator, an expansion valve, and an evaporator. Moreover, the method of controlling the expansion valve, which is installed in suction line, for making COP optimal was clarified. The effect of the size of mixing part can be explained based on the above-mentioned balance, and the optimum size of the mixing part can also be predicted theoretically. Experimental results can be explained with sufficient accuracy by assuming nozzle efficiency and diffuser efficiency appropriately. The low viscosity of carbon dioxide showed that the length of mixing part did not have large effect on the efficiency.About the improvement in efficiency of the heat exchanger, which uses carbon dioxide as an operation medium, the performance of evaporation heat transfer was investigated using heat transfer tubes with 1-6mm ID. Heat transfer characteristics in case lubricant oil was included were also investigated. Following experimental correlations were obtained from the experimental results ; the pre-dry out heat transfer before dry out occurs, the quality when dry out generates, and the post dry out heat transfer after dry out generating.

进行了称为弹出器的扩展功率回收机制的研究和开发，该机制有望改善二氧化碳热泵的COP。基于对超音速喷嘴的研究结果，实际设计了整个喷射器系统，实际的喷射器型热泵结合了其制造，进行了性能测试，并对实验结果进行了分析。这些研究结果阐明了以下内容。首先，弹射器周期中弹射器的性能取决于冲击波引起的压力增加，这是在混合部位和扩散器中产生的，以及涵盖吸入流的整个通道的压力损失特性，从喷射器流出，从弹射器出发到弹出器，从弹射器的突出部分通过燃气分离器，膨胀器，膨胀阀和evaporator，并通过evaportor a everaver and aveportor。此外，阐明了在吸入线中安装的膨胀阀的方法，以使COP变得最佳。可以根据上述平衡来解释混合部分大小的效果，并且也可以从理论上预测混合部分的最佳尺寸。实验结果可以通过假设喷嘴效率和扩散器效率适当的能力来解释。二氧化碳的低粘度表明，混合零件的长度对效率没有很大的影响。大约使用使用二氧化碳作为操作介质的热交换器的效率提高，使用具有1-6mm ID的热传递管研究了蒸发热传递的性能。如果还研究了润滑油，也研究了传热特征。从实验结果中获得了实验相关性；在干燥之前进行预脱水的热传递，干燥时的质量会产生，然后在干燥产生后干燥传热。

项目成果

期刊论文数量（22）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

超臨界圧二酸化炭素冷却熱伝達率の測定手法に関する検討

超临界压力二氧化碳冷却传热系数测量方法研究

DOI：
发表时间：
2004
期刊：
日本冷凍空調学会年次大会講演論文集
影响因子：
0
作者：
党超鋲;王剣鋒;飛原英治
通讯作者：
飛原英治

超臨界二酸化炭素の冷却熱伝達に与えるオイルの影響

油对超临界二氧化碳冷却传热的影响

DOI：
发表时间：
2004
期刊：
第41回日本伝熱シンポジウム講演論文集
影响因子：
0
作者：
福岡賢;大薮貴之;党超鋲;王剣鋒;飛原英治
通讯作者：
飛原英治

Study on CO2 ejector system to improve heat pump efficiency

提高热泵效率的CO2喷射系统研究

DOI：
发表时间：
2004
期刊：
The International Symposium on New Refrigerants and Environmental Technology
影响因子：
0
作者：
Satoshi AKAGI;Chao-Bin DANG;Jianfeng WANG;Eiji HIHARA
通讯作者：
Eiji HIHARA

二酸化炭素冷凍サイクルにおける二相流エジェクタの特性

二氧化碳制冷循环两相流喷射器的特点