Design analysis of a Helium re-condenser

26th International Cryogenic Engineering Conference & International Cryogenic Materials Conference 2016

材料科学;物理学

Muley, P.K.^1,2 ; Bapat, S.L.^2 ; Atrey, M.D.^2

Mechanical Engineering Department, Sardar Patel College of Engineering, Mumbai

400058, India^1

Mechanical Engineering Department, Indian Institute of Technology Bombay, Mumbai

400076, India^2

关键词: Condensation heat transfer coefficients;    Condensing capacity;    Design Analysis;    Proper design;    Recondensation;    Rectangular fins;    Refrigerating capacity;    Thermal Performance;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/171/1/012067/pdf
DOI  :  10.1088/1757-899X/171/1/012067

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

Modern helium cryostats deploy a cryocooler with a re-condenser at its II stage for in-situ re-condensation of boil-off vapor. The present work is a vital step in the ongoing research work of design of cryocooler based 100 litre helium cryostat with in-situ re-condensation. The cryostat incorporates a two stage Gifford McMahon cryocooler having specified refrigerating capacity of 40 W at 43 K for I stage and 1 W at 4.2 K for II stage. Although design of cryostat ensures thermal load for cryocooler below its specified refrigerating capacity at the second stage, successful in-situ re-condensation depends on proper design of re-condenser which forms the objective of this work. The present work proposes design of helium re-condenser with straight rectangular fins. Fins are analyzed for optimization of thermal performance parameters such as condensation heat transfer coefficient, surface area for heat transfer, re-condensing capacity, efficiency and effectiveness. The present work provides design of re-condenser with 19 integral fins each of 10 mm height and 1.5 mm thickness with a gap of 1.5 mm between two fins, keeping in mind the manufacturing feasibility, having efficiency of 80.96 % and effectiveness of 10.34.