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Purpose: This study aims to evaluate the energy efficiency and operational optimization of a variable-speed, low-temperature heat pump drying system designed for sewage sludge treatment. The research addresses the need for experimental validation of inverter-controlled heat pump systems that can reduce Specific Energy Consumption (SEC) and emissions compared to fossil-fuel-based dryers. Research Design & Data: A pilot-scale closed-loop belt dryer equipped with an inverter-driven scroll compressor (30–200 Hz) was fabricated and tested at compressor frequencies of 130, 160, and 180 Hz. Experimental data were collected for power use, temperature, pressure, and moisture content, supplemented by external verification from the Korea Testing & Inspection Institute (KTI). Research Results: The SEC decreased from 0.580 to 0.564 kWh kg⁻¹-H₂O as frequency increased, while final moisture contents remained ≤ 10 wt %. Average energy savings reached 31.5 % compared with conventional dryers. The system maintained stable condensation (17.6–20 bar) and evaporation (5.3–6.7 bar) pressures, confirming robust thermodynamic performance. Conclusion: The results demonstrate that optimal operation occurs near 170–180 Hz, balancing energy efficiency and moisture removal. The inverter-controlled heat pump dryer offers a technically stable, zero-emission alternative for wastewater facilities, aligning with carbon-neutral and circular-economy goals, and providing a scalable foundation for future hybrid sludge–biomass drying systems.

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기사명 저자명 페이지 원문 목차
Abundance, distribution, and conservation status of Himalayan ibex (Capra sibirica) in the Imit Valley, Ghizer District, Gilgit-Baltistan, Pakistan Benish Zahra, Zia Afroz, Woo-Taeg Kwon p. 1-8
(A) study on the factors affecting the workplace application of periodic education for supervisors : focusing on personal characteristics and program factors Dai Seong Heo, Eun Gu Ham p. 9-14
(A) study on the prevention of thermal diseases in workers in high heat working environment : around the steel mill Hye-Ryeong O, Won-Mo Gal, Ok-Nam Park p. 15-24
(A) study on the strengthening of performance of risk evaluation in construction industry Il-Woo Nam, Sung-Ill Lee p. 25-30
Text network analysis of core nursing skills research in Korea Do-Young Lee p. 31-40
(A) study on the effectiveness of shampoo containing tea tree oil in improving sensitive scalps Hye-Ri Kang, Young-Jin So p. 41-46
Comparative analysis of medical device regulation in Korea and the United States Soon-Gyu Lee, Seong-Gyu Ahn, Hong-Gyu Park, Sang-Geon Park p. 47-53
Optimization of variable-speed heat pump drying system for energy-efficient treatment of sewage sludge Sung-Gyun Cho, Woo-Taeg Kwon, Young-Nam Kim, Sung-Il Noh, Jong-kyu Kang, Hyo-jun Kim, Yun-seok Oh, Se-jun Lim, Seung-bin Park, Lee-Seung Kwon p. 55-67
Effect of channel distribution in education distribution environment using ChatGPT Eunsu Lee, Eunrae Lee, Jaemin Lee p. 69-79
Proposed engineering design model for a blockchain-enabled collaborative medical information platform utilizing AI imaging diagnosis patent technology Junchul Kang p. 81-96
Effects of a synesthetic visual reminiscence program on cognition and empathy in older adults Se-Nam Oh, Meong-Heui Kang p. 97-117

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