Affiliation of Author(s):航空学院
Journal:APPLIED THERMAL ENGINEERING
Key Words:Two-phase thermosyphon loop Evaluation index Design criterion Heat pipe
Abstract:For energy conservation, two-phase thermosyphon loops (TPTLs) have been widely used in air conditioning systems. Unfortunately, the evaluation index and design criterion of the TPTL is currently lacking, and causes for poor performance are inconclusive. In this study, an "ideal cycle" (optimal state) of the TPTL was proposed, and an approaching degree 8 was defined to evaluate the extent of approaching the "ideal cycle". Furthermore, a visual experimental platform was developed, and real cycles under different conditions were measured and evaluated. The results indicate that: (1) the performance of the "ideal cycle" is the upper limit of the performances of all real cycles, and the approaching degree provides an effective evaluation index and design criterion; (2) causes for low approaching degree have been identified and illustrated visually, from the perspective of refrigerant distribution, including under-charged refrigerant, over-charged refrigerant, insufficient height difference, and considerable flow resistance; and (3) the "ideal cycle" can be approached, only when the filling ratio (100%) and the height difference (1.2 m) is optimal, and the flow resistance is negligible simultaneously. (C) 2017 Elsevier Ltd. All rights reserved.
ISSN No.:1359-4311
Translation or Not:no
Date of Publication:2018-02-25
Co-author:Shi, Wenxing,Li, Xianting,Wang, Baolong,Zhang, Guohui
Correspondence Author:Penglei Zhang
Date of Publication:2018-02-25