TY - JOUR ID - 430 TI - Influence of unsuitable operational conditions on the transient performance of a small hydrogen liquefier JO - Hydrogen, Fuel Cell & Energy Storage JA - HFE LA - en SN - 2980-8537 AU - Saberimoghaddam, Ali AU - Bahri Rasht Abadi, Mohammad Mahdi AD - Malek Ashtar University of Technology AD - Department of Chemistry and Chemical Engineering, Faculty of Chemical Engineering, Malek Ashtar University of Technology (MUT), Lavizan 158751774, Tehran, Iran Y1 - 2017 PY - 2017 VL - 3 IS - 3 SP - 199 EP - 212 KW - heat exchanger KW - Joule-Thomson KW - transient KW - Hydrogen KW - refrigeration DO - 10.22104/ijhfc.2017.430 N2 - Joule-Thomson cooling systems are used in refrigeration processes such as cryogenic gas liquefaction. Although extensive studies have been carried out by researchers, most of them include cryogenic heat exchangers and their associated fields. In the current study, an attempt was made to indicate the effect of using inappropriate operational conditions in a cryogenic Joule-Thomson cooling system including recuperative heat exchanger, expansion valve and collector. Mass flow rate and operational pressure were selected as design parameters while cool-down time and final temperature of high-pressure gas at heat exchanger outlet were considered as responses. The results showed that using mass flow rate smaller than the design value led to considerable decrease in performance. Operational pressure had lesser effect on cool-down time. Increasing the pressure had no significant effect on the gas temperature at expansion valve inlet for high mass flow rates. Using unsuitable values for mass flow rate and operational pressure might lead to fail liquefaction despite using heat exchanger with high effectiveness. UR - https://hfe.irost.ir/article_430.html L1 - https://hfe.irost.ir/article_430_c8945e7cc423753ede36cace0616c8fa.pdf ER -