Design of high efficiency mixed refrigerant Joule–Thomson refrigerator for cooling HTS cable |
| |
Authors: | Jisung Lee Gyuwan Hwang Sangkwon Jeong Byung Jun Park Young Hee Han |
| |
Affiliation: | aCryogenic Engineering Laboratory, Division of Mechanical Engineering, School of Mechanical, Aerospace and Systems Engineering, Korea Advanced Institute of Science and Technology, 335 Gwahangno, Yuseong-gu, Daejeon 305-701, Republic of Korea;bKorea Electric Power Research Institute, 65 Munji-Ro, Yuseong-gu, Daejon 305-760, Republic of Korea |
| |
Abstract: | The substitution of high temperature superconducting (HTS) cables for existing subterranean electric transmission lines is arising as a solution to continuously increasing electricity demand in urban areas. A cryogenic refrigeration system having the characteristics of high reliability, high efficiency, large cooling capacity, and low capital cost is essential to enable such a substitution. These requirements can be satisfied with a mixed refrigerant Joule–Thomson (MR JT) refrigerator. Unfortunately, usual MR JT refrigerators exhibit good performance at refrigeration temperatures above 80 K. A precooled neon–nitrogen MR JT refrigerator is proposed in this paper that can cool HTS cables at 70 K. The coefficient of performance (COP) of the proposed MR JT refrigerator is predicted to be 0.058 at 70 K (19.2% for exergy efficiency) with the optimized design variables. The COP can be improved further to 0.064 by enhancing the efficiency of the precooling cycle. The maximum achievable COP demonstrates the feasibility of MR JT refrigerator for cooling HTS cable. |
| |
Keywords: | B Gas mixtures E Cycle optimization E Joule&ndash Thomson coolers F Transmission lines |
本文献已被 ScienceDirect 等数据库收录! |
|