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Development of Cold Energy Transport System Unilizing Ice/Water Mixture for District Cooling

利用冰/水混合物进行区域供冷的冷能传输系统的开发

基本信息

批准号：
07555070
负责人：
HATTORI Masaru
金额：
$ 6.34万
依托单位：
Nagaoka University of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1997
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07555070/
关键词：
District Cooling Cold Energy Transport Ice Water Mixture Flow Pressure Drop Ice Fraction Control Blockage Heat Exchanger Heat Transfer Characteristics 氷分率蓄熱槽

项目摘要

1. The ice/water mixture transportation system was designed taking social conditions such as the electric charge system into consideration.2. The characteristics of ice/water mixture through pipes were investigated. Effects of pipe diameter, pipe material and particle size on the pressure drop through a straight pipe were clarified, and a method to predict the pressure drop was proposed taking these factors into consideration. The energy loss and ice distribution characteristics in branching pipes were clarified experimentally. Compressive yield stress of an ice-particle cluster in water was measured. The yield stress thus obtained was shown to correspond with the adhesive property of particles to form clusters in a pipe flow.3. A device was developed to control the flow rate and the ice fraction in a pipe branching from the main transportation pipe. This device was confirmed to work successfully irrespective of the flow condition in the main pipe.4. Blockage at a vertical downward pipe connected to a horizontal pipe with an elbow and an ice fraction regulator wsa investigated. The compressed-plug type blockage occurred at the latter when the ice concentration ratio exceeded a critical value which depended on particle shape/size.5. A storage tank was made on a trial basis. Tests on the performance of the device to take out ice to the main pipe were carried out to obtain data for further improvement.6. Heat transfer characteristics of ice/water mixture flow in the double piped heat exchanger was investigated. Relationship between heat transfer coefficient and velocity or ice fraction was clarified.7. An ice-water direct contact heat exchanger was contrived and heat transfer characteristics between ice and water in the heat exchanger were studied. Effects of velocity on the heat transfer coefficient and amount of ice necessary to attain a desired heat exchange rate were clarified.

1.在充分考虑收费系统等社会条件的基础上，设计了冰水混合输送系统.研究了冰水混合物在管道中的流动特性。阐明了管径、管材和颗粒粒径对直管压降的影响，提出了考虑这些因素的直管压降预测方法。通过实验研究了分支管内冰的能量损失和分布特性。测量了水中冰颗粒团的压缩屈服应力。由此得到的屈服应力被证明是对应于颗粒的粘附性能，以形成在管流中的集群。开发了一种装置来控制从主输送管道分支的管道中的流速和冰分数。无论主管道中的流动条件如何，该装置都被证实成功地工作。研究了垂直下降管道与水平管道之间的堵塞问题。当冰浓度比超过一个临界值（取决于颗粒的形状/尺寸）时，后者发生压缩塞型堵塞.在试验的基础上制造了一个储油罐。对主管道除冰装置的性能进行了试验研究，为进一步的改进提供数据.研究了冰/水混合物在套管式换热器中的传热特性。阐明了传热系数与流速和含冰率的关系.设计了一种冰水直接接触式换热器，并对该换热器内冰水间的传热特性进行了研究。澄清了速度对传热系数和达到所需热交换率所需的冰量的影响。