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Preface to special issue on Supercritical Carbon Dioxide in Thermal and Energy Sciences
Heat Transfer Research ( IF 1.7 ) Pub Date : 2020-01-01 , DOI: 10.1615/heattransres.2019030803 Bengt Sunden , Gongnan Xie , Yong Hui Xie
Heat Transfer Research ( IF 1.7 ) Pub Date : 2020-01-01 , DOI: 10.1615/heattransres.2019030803 Bengt Sunden , Gongnan Xie , Yong Hui Xie
Any substance has a critical point which is obtained at certain conditions of pressure and temperature. When a fl uid is subjected to a pressure and a temperature higher than its critical point, the fl uid is said to be supercritical. In the supercritical region, the thermophysical properties exhibit unique behavior and have intermediate values between those of a liquid and a gas. The supercritical fl uids have densities like liquids, viscosities like gases while diffusivities are intermediate in relation to both a liquid and a gas. Supercritical fl uids have no surface tension because they are not subject to a vapor–liquid interface, and accordingly no molecules have attraction to the interior of the liquid. The fl uid is said to be supercritical as it is heated above its critical temperature and compressed above its critical pressure. Carbon dioxide (CO2) is the most widely used supercritical fl uid. This is so as CO2 is cheap, chemically inert, nontoxic, nonfl ammable, and available at high purities and low costs. In addition, the critical point of CO2 is low, 31oC and the critical pressure is 74 bar. These allow the fl uid to be used at mild temperature operating conditions without generating any harmful organic residues. It is also sometimes referred to as a green solvent. Based on the importance of supercritical CO2, a symposium "Advances in Supercritical Carbon Dioxide (SCO2) in Thermal and Energy Sciences" (ASTES 2018) was held in Xi'an, China and hosted by Xi'an Jiaotong University, Xi'an, China in July 2018. The major topic areas were: a) thermal and mechanical characteristics of SCO2 in thermal power systems, b) design and analysis of SCO2 heat exchangers for thermal energy systems, c) fl uid fl ow, heat transfer, and energy conversion with SCO2, d) optimization design of SCO2 power and energy systems and components, and e) SCO2 in solar energy, geothermal energy, waste heat. Some papers were invited for this special issue of Heat Transfer Research (HTR). All papers were reviewed according to the rules and procedures of HTR. We thank all authors for their careful contribution to this special issue and their efforts to maintain a high quality of their papers. We also thank the editor-in-chief Professor Yong Tao and the managing editor Professor Zhixiong Guo for accepting our proposal of this special issue. The Begell House team is acknowledged for timely and precise handling of this issue.
更新日期：2020-01-01
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