• The Magazine of the Society of Air-Conditioning and Refrigerating Engineers of Korea
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• v.29 no.7
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• pp.28-35
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• 2000

LNG 냉열 이용은 일본초저온(주)의 냉장보관 사업의 에너지절감 (65%)형 초저온 (-55$^{\circ}C$) 대형냉장고로 일본 뿐만 아니라 세계적으로 최초의 냉장업체이다. 회사 건설시는 입지선정, 경제성검토, 기술성, 공해상의 검토 등을 거쳐 완성된 업체로써 시설규모는 냉장 20,000 M/T, 1일 LNG 공급량 90M/T으로 현재 가동중이며 대부분의 동결 및 냉장 품목은 참치(마구로)가 83%를 차지하고 기타가 17% 였다. 냉장고의 가동율은 75%로 매우 높은 편이였다, LNG식 냉동장치의 가장 큰 장점은 일반적인 냉동방식 전력비의 1/3 밖에 소요되지 않는다는 것이다. L$N_2$의 내열이용 업체는 근기냉열(주)은 오사카의 천북에 있으며, L$N_2$를 자가 생산하여 면류 생산공장으로 직송하고 동결제조 하여 품질의 고급화 및 위생식품을 제조 판매하고 있다. 규모는 년간 2,000만식을 생산하고 주 생산제품은 조리면 및 냉동우동 등이다. L$N_2$의 소비가격은 전기식 냉동기에 비하여 5~9배의 고액이 소요되는 것이 결점이라고 할 수 있다.

• Transactions of the Korean hydrogen and new energy society
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• v.31 no.3
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• pp.302-306
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• 2020

In this study, computer simulation works using PRO/II with PROVISION V10.2 have been performed for a cascade refrigeration cycle using methane, ethylene and propane as refrigerants. LNG cold heat was also utilized in order to save the compression powers for the ethylene and propane refrigeration cycles. It was concluded that about 77% of compression power can be saved by using LNG cold heat through the exchanging heat with refrigerants. We could also know that the cold heat price contained in 1 ton of LNG is 16,155 won.

• Transactions of the Korean hydrogen and new energy society
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• v.31 no.3
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• pp.322-327
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• 2020

In this work, a study for the reduction of the electric power consumption has been estimated in main air compressors in the air separation unit through cryogenic distillation columns with PRO/II with PROVISION V10.2 at AVEVA company. Both required LNG mass flow rate and cold heat contained in 1 ton of LNG were also predicted using Peng-Robinson equation of state with Twu's new alpha function. Through this work, we concluded that 32.33-48.69% of electric power could be saved by using LNG cold heat.

• Transactions of the Korean hydrogen and new energy society
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• v.29 no.4
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• pp.357-362
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• 2018

In this study, computer simulation and optimization works have been performed for a refrigeration cycle using ammonia as a refrigerant and also how much power was saved when the liquefied natural gas cold heat is replaced for the refrigeration cycle. PRO/II with PROVISION release 10.0 from Schneider electric company was used, and Peng-Robinson equation of the state model was selected for the modeling of the refrigeration cycle and LNG cold heat utilization process.

• Transactions of the Korean hydrogen and new energy society
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• v.31 no.2
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• pp.259-264
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• 2020

In this study, comparison study has been performed between two-stage compression and a vapor-recompression refrigeration cycle and a liquefaction using LNG cold heat. When using a first method using two-stage compression and a refrigeration cycle, at least three compressors are required, however when using LNG cold heat, no compressor is required since carbon dioxide can be pumped after condensing with the heat exchange with -160℃ of LNG. Through this study, we can save more than one hundred million KRW annually by using LNG cold heat instead of using gas compression and refrigeration cycle.

• Transactions of the Korean hydrogen and new energy society
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• v.30 no.2
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• pp.188-192
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• 2019

Comparative studies between single- and two-stage expansion process using LNG cold heat have been performed for a closed Rankine power generation cycle. PRO/II with PROVISION release 10.0 from Schneider Electric Company was used, and the Peng-Robinson equation of state model with Twu's alpha function was selected for the modeling and optimization of the power generation cycle using LNG cold heat. In two-stage power generation cycle, 6.7% more power was obtained compared to that of single-stage power generation cycle through the optimization works.

• Transactions of the Korean hydrogen and new energy society
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• v.30 no.5
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• pp.473-477
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• 2019

In this paper, cold heat price contained in the 1 ton/h of LNG has been evaluated using PRO/II with PROVISION release 10.2 from Aveva company when LNG is used to liquefy several refrigerants instead of using vapor recompression refrigeration cycle. Normal butane, R134a, NH3, R22, propane and propylene refrigerants were selected for the modeling of refrigeration cycle. It was concluded that LNG cold heat price was inversely proportional to the refrigerant supply temperature, even though LNG supply flow rate is not varied according to the refrigerant supply temperature.

• Transactions of the Korean hydrogen and new energy society
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• v.34 no.5
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• pp.549-554
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• 2023

In this paper, three kinds of studies have been completed to obtain highly purified carbon dioxide having more than 7N purity as an electronic grade quality. PRO/II with PROVISION release January 2023 from AVEVA company was used, and Peng-Robinson equation of the state model with Twu's alpha function was selected for the modeling of the cryogenic distillation process. When using LN2 cold heat, we can obtain highest recovery of carbon dioxide as a bottom product for a cryogenic distillation column.

• 한국가스학회:학술대회논문집
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• 2006.11a
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• pp.221-232
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• 2006

• Journal of the Korean Institute of Gas
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• v.16 no.6
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• pp.136-142
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• 2012

Thermodynamic equations for the electric power and temperature in a turbo expander generator (TEG) using pressure energy in a natural gas line are derived. From the equations, it was shown that dominant factor is not the pressure difference but the pressure ratio. The high energy level in the inlet of TEG can be made from nearly no expense of electric energy input, which means TEG can be treated as one of newly available clean energy source. If a post heating method is chosen to heat up expanded natural gas, the usage of cold energy is possible without a refrigeration cycle. The combined TEG and refrigeration system enhances economic benefit much more.