A Hybrid LSTM Data-Driven Model for Predicting the Dynamic Behavior of an Ammonia-Fueled Solid Oxide Fuel Cell Stack

VAN-TIEN GIAP, THAI-QUYEN QUACH, DONGKEUN LEE

This study proposes a data-driven model based on a long short-term memory (LSTM) neural network for prediction of the dynamic behavior of an ammonia-fueled soli...

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DOI: https://doi.org/10.7316/JHNE.2026.37.4.283

Concentration Responses of Upper Hydrogen Sensor Under Different Release Conditions in Semi-closed Vinyl Tent

JUWON PARK, BYOUNGJIK PARK, SUNGHWAN YOON, YANGKYUN KIM

Hydrogen leakage in semi-closed spaces can cause local accumulation near the ceiling due to buoyancy, resulting in sensor responses that depend strongly on rele...

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DOI: https://doi.org/10.7316/JHNE.2026.37.4.295

An Investigation on I-V Characteristics and Cell Voltage Distribution According to Fuel Supply Conditions (Pure H₂ vs. 75% H₂) in a Reformer-Integrated PEMFC System for Buildings

YONGSUN PARK, YEI SIK JEON, SANG-HYUK LEE, JUN KEOL AHN, HYEON-AH PARK

This study evaluates a reforming system-integrated Proton Exchange Membrane Fuel Cell (PEMFC) system using city gas, where the 75% hydrogen concentration signif...

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DOI: https://doi.org/10.7316/JHNE.2026.37.4.307

Experimental Study on the Test Method for Liquefied Hydrogen Valves Under Demonstration Conditions

HYEOK CHOI, JI-WON CHOI, CHANG-WOO JUNG, SANG-MIN KIM

Liquefied hydrogen (LH) service near 20 K can cause boil-off gas generation, pressure rise, and seat leakage in cryogenic valves under heat ingress. Liquid nitr...

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DOI: https://doi.org/10.7316/JHNE.2026.37.4.314

Energy Characterization of a Natural Gas-Based Plasma Methane Pyrolysis Hydrogen Production System

SEUNGYOUNG PARK, HEUNGSUK JIN, JONGMIN PARK, SOYOUNG LEE

This study develops a process model for a natural gas-based turquoise hydrogen production system using AVEVA Process Simulation, covering feed preheating, plasm...

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DOI: https://doi.org/10.7316/JHNE.2026.37.4.326

Fundamental Characteristics of Two-Fluid Spray Cooling for Enhanced PEMFC Cooling Performance in Heavy-Duty Vehicles

JUNYEONG LEE, JONGBIN WOO, YOORA CHOI, SANGSEOK YU

When high-capacity proton exchange membrane fuel cell (PEMFC) systems are applied to heavy-duty commercial vehicles, including 48–60-ton-class vehicles, the hea...

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DOI: https://doi.org/10.7316/JHNE.2026.37.4.336

Development of an Energy Security-Based Evaluation Framework for Selecting Overseas Clean Hydrogen Import Partner Countries for Korea

DAWON KIM, DO-HYUNG KIM, SANGMIN KIM, SUNGCHAN YEOM, JONGSEOK SHIN

This study develops a 15-indicator framework across four energy security categories, identifying 22 green hydrogen and 10 blue hydrogen supply candidate countri...

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DOI: https://doi.org/10.7316/JHNE.2026.37.4.346

Effect of Milling-Induced Physical Property Changes of Pt/C Catalysts on PEMFC Electrode Structure and Performance

KYOUNG DEOK KIM, JIHU KIM, BEOMSOO KANG, SUHAN LEE, JUHYUN PARK, CHUL-MIN BAEK, TAEHOON KIM

This study investigated how milling-induced tap density variation of Pt/C catalysts affects the cathode catalyst layer structure and single-cell performance of ...

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DOI: https://doi.org/10.7316/JHNE.2026.37.4.359

Techno-Economic Analysis of an Offshore Green Hydrogen Production System Integrated With Fixed-Bottom Offshore Wind Power

BYUNG-SOO KIM, CHANG-HYUK LIM, HEEWON SONG, YONGKYU KIM, KWANG-SU LEE, KYONG-HWAN KIM

This study estimates the levelized cost of hydrogen (LCOH) of an offshore green hydrogen production system based on fixed-bottom offshore wind power in Jeju and...

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DOI: https://doi.org/10.7316/JHNE.2026.37.4.373

Kinematic Design of a Smart Visual Testing (VT) System for Structural Integrity of SMR Heat Exchangers in Nuclear Hydrogen Production

DONGHYUN KIM, OCKTAECK LIM

Clean hydrogen production via Small Modular Reactors (SMRs) requires high structural integrity of heat exchangers. However, visual testing (VT) in highly radioa...

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DOI: https://doi.org/10.7316/JHNE.2026.37.4.385

Aerodynamic Design of a Turbo Expander Impeller for Performance Improvement in CO₂ Liquefaction

SUNG KIM, SOON-YOUNG JEONG, KWANG-HO KIM

In this study, the design of a turbo expander for performance improvement was carried out using computational fluid dynamics (CFD). The blade angle distribution...

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DOI: https://doi.org/10.7316/JHNE.2026.37.4.391

Feasibility Assessment of a Fuel Cell System Using a Formic Acid-Based Hydrogen Generator: System Performance Evaluation and Energy Density Analysis

CHAE MIN HWANG, JI WON HAN, JIN SU NO, DONG HYEONG KIM, TAE HOON LEE, SU SANG YU, MIN JAE KIM, SEONG MO YUN, TAEK HYUN OH

This study assesses the feasibility of a fuel cell system using a formic acid-based hydrogen generator. The hydrogen generator employing a Pd/NH-MWCNTs catalyst...

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DOI: https://doi.org/10.7316/JHNE.2026.37.4.398

Net Efficiency Optimization of a Fuel Cell System Through Energy Conservation-Based Lower Heating Value Operation

KYUHYUNG PARK, KWONWOO YANG, JUNBEOM PARK, JUNHO YANG, SUKKEE UM

Physics-based, reduced-order fuel cell system models are developed to optimize net efficiency through energy-conservation-based heating-value prediction. The st...

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DOI: https://doi.org/10.7316/JHNE.2026.37.4.411

Process Simulation and Techno-Economic Analysis of a Heat Pump-Integrated Alkaline Water Electrolysis System Considering Sector Coupling

MIN-CHEOL CHO, DAYUL NA, JUN-HO JANG, JUNG-HUN NOH

Conventional alkaline water electrolysis systems discharge most of their waste heat, reducing overall energy utilization. This study proposes a heat pump-integr...

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DOI: https://doi.org/10.7316/JHNE.2026.37.4.420