Experimental investigation on heat transfer characteristics of supercritical CO2 cooled in horizontal helically coiled tube

被引：57
|
作者：
Xu, XiaoXiao [1 ]
Liu, Chao [1 ]
Dang, Chaobin [2 ]
Wu, Yangyang [1 ]
Liu, Xinxin [1 ]
机构：
[1] Chongqing Univ, Coll Power Engn, Minist Educ, Key Lab Low Grade Energy Utilizat Technol & Syst, Chongqing 400044, Peoples R China
[2] Univ Tokyo, Dept Human & Engn Environm Studies, 5-1-5 Kashiwanoha, Kashiwa, Chiba 2778563, Japan
来源：
INTERNATIONAL JOURNAL OF REFRIGERATION-REVUE INTERNATIONALE DU FROID | 2016年 / 67卷
基金：
中国国家自然科学基金;
关键词：
Supercritical CO2; Heat transfer; Horizontal helically coiled tube; Buoyancy; Experiment; PRESSURE-DROP CHARACTERISTICS; CARBON-DIOXIDE; NATURAL CIRCULATION; COOLING PROCESS; FLOW; SINGLE;
D O I：
10.1016/j.ijrefrig.2016.03.010
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
An experimental investigation on the heat transfer characteristics of supercritical CO2 during gas cooling process in a helically coiled tube is conducted. The experimental data are obtained over a mass flux range of 79.6-238.7 kg m(-2) s(-1), an inlet pressure range of 7.5-9.0 MPa and a mean bulk temperature of 23.0-53.0 degrees C. The effects of mass flux, bulk temperature and pressure on the heat transfer coefficient for helically coiled tubes are investigated. A comparative analysis of the gravitational buoyancy and the heat transfer coefficient is carried out between helically coiled tubes and straight tubes. A new heat transfer correlation of the supercritical CO2 in the horizontal helically coiled tube is proposed based on the experimental data. The maximum error between the predicted results of the new correlation and the experimental data is 20%. (C) 2016 Elsevier Ltd and IIR. All rights reserved.
引用
收藏
页码：190 / 201
页数：12
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