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Chang-Hyo Son
Department of Refrigeration and Air-Conditioning Engineering, Pukyong National University, Pusan 48513, Korea

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Journal article
Published: 30 April 2021 in Journal of Power System Engineering
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Due to environmental problems around the world, HFC refrigerants have been used instead of CFC and HCFC refrigerants with high ODP in the field. But, these refrigerants are also subject to regulation due to their high GWP. Accordingly to cope with the phased regulatory planning of HFC refrigerants, related companies have developed HFO refrigerants with low GWP. Among HFO refrigerants, the working fluid R-1234yf (GWP:4) in this paper is similar in thermodynamic properties to R-134a (GWP:1300). The experiment results are summarized as follows. The condensation heat transfer coefficient of R-1234yf in the double tube heat exchanger increased with increasing mass flux and quality. The condensation heat transfer coefficient decreased with increasing saturation temperature, but at high mass flux and high quality, it had little effect on saturation temperature. As the temperature difference between the coolant and the refrigerant increased, the heat transfer coefficient tended to increase. The condensation heat transfer coefficient of R-1234yf is lower than that of R-134a in almost all quality. However, at low quality and low mass flux the condensation heat transfer coefficient of R-1234yf tended to be greater than R-134a. Due to the difference in refrigerant physical properties such as density, surface tension, and thermal conductivity of the two refrigerants. As a result, it is believed that this paper could be used as a foundation for the optimal design of condensers using R-1234yf.

ACS Style

Chang-Hyo Son; Joon-Hyuk Lee; Jeong-In Yoon; Sung-Hoon Seol; Eun-Min Park; Sang-Woo Lee. Condensation heat transfer of R-1234yf in horizontal tube. Journal of Power System Engineering 2021, 25, 80 -85.

AMA Style

Chang-Hyo Son, Joon-Hyuk Lee, Jeong-In Yoon, Sung-Hoon Seol, Eun-Min Park, Sang-Woo Lee. Condensation heat transfer of R-1234yf in horizontal tube. Journal of Power System Engineering. 2021; 25 (2):80-85.

Chicago/Turabian Style

Chang-Hyo Son; Joon-Hyuk Lee; Jeong-In Yoon; Sung-Hoon Seol; Eun-Min Park; Sang-Woo Lee. 2021. "Condensation heat transfer of R-1234yf in horizontal tube." Journal of Power System Engineering 25, no. 2: 80-85.

Journal article
Published: 30 April 2021 in Journal of Power System Engineering
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Refrigerant, which is a heat transfer medium of a refrigeration system, has been continuously developed from the early refrigeration system to the present. However, as refrigerants with high ODP and GWP are regulated, HFO-based refrigerants and natural refrigerants are attracted attention. In this study, the heat transfer coefficient of R-1234yf, which has low GWP and similar properties to R-134a, was experimentally analyzed according to the vapor quality, heat flux, mass flux, and saturation temperature in the evaporation heat transfer process. As a result, the heat transfer coefficient increased as the vapor quality increased. The heat transfer coefficient increased even with the increasing heat flux, mass flux, and saturation temperature. Experimental results in this paper are provided as data on the design of heat exchangers for R-1234yf.

ACS Style

Chang-Hyo Son; Jun-Hyuk Lee; Jeong-In Yoon; Sung-Hoon Seol; Seung-Yun Cha; Nam-Wook Kim. Experimental study of evaporation heat transfer of R-1234yf in 7 mm horizontal smooth tube. Journal of Power System Engineering 2021, 25, 74 -79.

AMA Style

Chang-Hyo Son, Jun-Hyuk Lee, Jeong-In Yoon, Sung-Hoon Seol, Seung-Yun Cha, Nam-Wook Kim. Experimental study of evaporation heat transfer of R-1234yf in 7 mm horizontal smooth tube. Journal of Power System Engineering. 2021; 25 (2):74-79.

Chicago/Turabian Style

Chang-Hyo Son; Jun-Hyuk Lee; Jeong-In Yoon; Sung-Hoon Seol; Seung-Yun Cha; Nam-Wook Kim. 2021. "Experimental study of evaporation heat transfer of R-1234yf in 7 mm horizontal smooth tube." Journal of Power System Engineering 25, no. 2: 74-79.

Journal article
Published: 31 December 2020 in Journal of Power System Engineering
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Energy efficiency has been appeared in the spotlight recently. For this reason, the optimization of mixed refrigerant is also being highlighted. However, there are very few cases where non-flammable ones are optimized for the 170-288K temperature range. This paper analyzes from thermodynamic aspects of non-flammable mixed refrigerants in the Joule-Thomson cycle by simulation. In the temperature range of 170-288K, the composition ratio of the mixed refrigerants of five-component, R-245fa, R-134a, R-404A, R-23 and R-14 was optimized. Through this analysis, the refrigeration characteristics of each refrigerant were analyzed. In particular, the optimal composition ratio was found through temperature changes in enthalpy difference and intermediate heat exchanger with pressure difference between high and low pressure.

ACS Style

Ji-Hoo Choi; Sung-Soo Park; Sun-Geun Lee; Ji-Hoon Yoon; Chang-Hyo Son. Performance Characteristics of Joule-Thomson Cycle with Non-Flammable 5-component Mixed Refrigerants. Journal of Power System Engineering 2020, 24, 92 -97.

AMA Style

Ji-Hoo Choi, Sung-Soo Park, Sun-Geun Lee, Ji-Hoon Yoon, Chang-Hyo Son. Performance Characteristics of Joule-Thomson Cycle with Non-Flammable 5-component Mixed Refrigerants. Journal of Power System Engineering. 2020; 24 (6):92-97.

Chicago/Turabian Style

Ji-Hoo Choi; Sung-Soo Park; Sun-Geun Lee; Ji-Hoon Yoon; Chang-Hyo Son. 2020. "Performance Characteristics of Joule-Thomson Cycle with Non-Flammable 5-component Mixed Refrigerants." Journal of Power System Engineering 24, no. 6: 92-97.

Journal article
Published: 31 October 2020 in Journal of Power System Engineering
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ACS Style

Jung-In Yoon; Chang-Hyo Son; Junseok Ko; Hankil Yeom; Han-Som Jeong; Ji-Hoo Choi; Deuk-Yong Koh; Keuntae Lee. Exergy Analysis of Reverse Brayton Cryogenic System Using Neon. Journal of Power System Engineering 2020, 24, 63 -70.

AMA Style

Jung-In Yoon, Chang-Hyo Son, Junseok Ko, Hankil Yeom, Han-Som Jeong, Ji-Hoo Choi, Deuk-Yong Koh, Keuntae Lee. Exergy Analysis of Reverse Brayton Cryogenic System Using Neon. Journal of Power System Engineering. 2020; 24 (5):63-70.

Chicago/Turabian Style

Jung-In Yoon; Chang-Hyo Son; Junseok Ko; Hankil Yeom; Han-Som Jeong; Ji-Hoo Choi; Deuk-Yong Koh; Keuntae Lee. 2020. "Exergy Analysis of Reverse Brayton Cryogenic System Using Neon." Journal of Power System Engineering 24, no. 5: 63-70.

Journal article
Published: 29 September 2020 in Energies
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With the increased commercialization of high-temperature superconducting (HTS) power cables cooled using liquid nitrogen and the use of liquefied natural gas as fuel, the need for large-capacity reverse Brayton cryogenic systems is gradually increasing. In this paper, the thermodynamic design of a reverse Brayton cryogenic system with a cooling capacity of the 2 kW class at 77 K using neon as a refrigerant is described. Unlike conventional reverse Brayton systems, the proposed system uses a cryogenic turbo-expander, scroll compressor, and plate-type heat exchanger. The performance test conducted on the fabricated system is also described. The isentropic efficiency of the cryogenic turbo-expander was measured to be 86%, which is higher than the design specification. The effectiveness of the heat exchanger and the flow rate and operating pressure of the refrigerant were found to be lower than the design specifications. Consequently, the refrigeration capacity of the fabricated reverse Brayton cryogenic system was measured to be 1.23 kW at 77 K. In the future, we expect to achieve the targeted refrigeration capacity through further improvements. In addition, the faster commercialization of HTS power cables and more efficient storage of liquefied natural gas will be realized.

ACS Style

Keuntae Lee; Deuk-Yong Koh; Junseok Ko; Hankil Yeom; Chang-Hyo Son; Jung-In Yoon. Design and Performance Test of 2 kW Class Reverse Brayton Cryogenic System. Energies 2020, 13, 5089 .

AMA Style

Keuntae Lee, Deuk-Yong Koh, Junseok Ko, Hankil Yeom, Chang-Hyo Son, Jung-In Yoon. Design and Performance Test of 2 kW Class Reverse Brayton Cryogenic System. Energies. 2020; 13 (19):5089.

Chicago/Turabian Style

Keuntae Lee; Deuk-Yong Koh; Junseok Ko; Hankil Yeom; Chang-Hyo Son; Jung-In Yoon. 2020. "Design and Performance Test of 2 kW Class Reverse Brayton Cryogenic System." Energies 13, no. 19: 5089.

Journal article
Published: 30 June 2020 in Journal of the Korean Society for Power System Engineering
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The Kigali protocol is a follow-up to the Paris protocol, which phases out the use and emission of HFCs. Korea belongs to the first group and should take action under the Kigali protocol. Among them, new ships equipped with refrigeration facilities or repair of existing ships cannot use regulated refrigerants and must use alternative refrigerants. However, in the case of ships, especially in repair, it is very difficult to grasp the actual situation, so the statistics or actual conditions are unknown. Therefore, this paper is to investigate and analyze the amount of refrigerant used for ship repair, and to present the basic data and the current status. The main results are summarized as follows. Existing large-scale repair shipyards in Korea have been converted to new construction projects. Therefore, there are about 80 repair shipyards in Korea, but most of them are very small, with several thousand tons or less. Investigating the use of refrigerants by ship repair companies shows that most of the old ships are repaired, so the refrigerants of R22 and R717 are the most commonly used. Based on the survey of the refrigerant use status of ship repair companies, the refrigerant consumption is estimated to be 43,940 kg.

ACS Style

Jung-In Yoon; Kwang-Hwan Choi; Yong-Bok Kim; Joon-Hyuk Lee; Chang-Hyo Son. Investigation of Refrigerant Usage according to Ship Repairing Companies. Journal of the Korean Society for Power System Engineering 2020, 24, 23 -28.

AMA Style

Jung-In Yoon, Kwang-Hwan Choi, Yong-Bok Kim, Joon-Hyuk Lee, Chang-Hyo Son. Investigation of Refrigerant Usage according to Ship Repairing Companies. Journal of the Korean Society for Power System Engineering. 2020; 24 (3):23-28.

Chicago/Turabian Style

Jung-In Yoon; Kwang-Hwan Choi; Yong-Bok Kim; Joon-Hyuk Lee; Chang-Hyo Son. 2020. "Investigation of Refrigerant Usage according to Ship Repairing Companies." Journal of the Korean Society for Power System Engineering 24, no. 3: 23-28.

Journal article
Published: 31 October 2019 in Journal of the Korean Society for Power System Engineering
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Heat pumps consist mainly of compressors, evaporators, condensers and expansion valves, and change the flow of refrigerant to allow cooling or heating in a single unit. The expansion valve used in the heat pump is mainly used with the electronic expansion valve for the conventional manufactured cooler, which flows in a single direction, requiring a separate bypass line and check valve, thereby reducing the performance of the freezer. Therefore, in this study, the cooling performance according to the opening step was analyzed using a interactive expansion valve for R-404A, which does not require a bypass line and a check valve during the design of the heat pump. The cooling performance coefficient for R-404A was 3.633 for thermostatic expansion valve, 3.795 for conventional electronic expansion valves and 3.851 for interactive electronic expansion valves. This is an improvement of 6.001% compared to the temperature formula and 1.476% over the conventional electronic system.

ACS Style

Chang-Hyo Son; Joon-Hyuk Lee; Sang-Woo Lee; Jung-In Yoon; Choon-Geun Moon. Cooling Performance of Heat Pump with Interactive Electronic Expansion Valve. Journal of the Korean Society for Power System Engineering 2019, 23, 86 -92.

AMA Style

Chang-Hyo Son, Joon-Hyuk Lee, Sang-Woo Lee, Jung-In Yoon, Choon-Geun Moon. Cooling Performance of Heat Pump with Interactive Electronic Expansion Valve. Journal of the Korean Society for Power System Engineering. 2019; 23 (5):86-92.

Chicago/Turabian Style

Chang-Hyo Son; Joon-Hyuk Lee; Sang-Woo Lee; Jung-In Yoon; Choon-Geun Moon. 2019. "Cooling Performance of Heat Pump with Interactive Electronic Expansion Valve." Journal of the Korean Society for Power System Engineering 23, no. 5: 86-92.

Journal article
Published: 30 April 2019 in Journal of the Korean Society for Power System Engineering
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ACS Style

Chang-Hyo Son; Choon-Geun Moon. Performance Analysis of the Cascade Refrigeration System using R744 with the low temperature cycle. Journal of the Korean Society for Power System Engineering 2019, 23, 5 -11.

AMA Style

Chang-Hyo Son, Choon-Geun Moon. Performance Analysis of the Cascade Refrigeration System using R744 with the low temperature cycle. Journal of the Korean Society for Power System Engineering. 2019; 23 (2):5-11.

Chicago/Turabian Style

Chang-Hyo Son; Choon-Geun Moon. 2019. "Performance Analysis of the Cascade Refrigeration System using R744 with the low temperature cycle." Journal of the Korean Society for Power System Engineering 23, no. 2: 5-11.

Journal article
Published: 31 December 2018 in Journal of Advanced Marine Engineering and Technology
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The applicability of hot spring water to binary cycles or organic Rankine cycles (ORCs) was empirically verified in Japan and Indonesia where hot spring water is used as a heat source for power generation. The purpose of this study was to introduce an ORC/binary system and verify its applicability by using hot spring water-approximately 65 ℃ from the Dongnae area of Busan. The system efficiency and generated power were estimated by a simulation analysis prior to the introduction of the system, and the analysis was conducted to select an optimum working fluid and derive an efficiency improvement method. The analysis results showed that the system efficiency of the basic cycle was highest at 6.20%, when butane was used as a refrigerant, followed by isobutane, R245fa, and R245ca. As a result of analyzing the cycle performance by applying regenerators to only the top four refrigerants, an increase in efficiency of 9.36% compared with the efficiency of the basic cycle was confirmed when R245ca was applied. Regarding the cycle performance change due to the degree of super-heating at the turbine inlet, system efficiency tended to increase as the super-heating degree increased for all four refrigerants. When a super-heating degree of 6 ℃ was set, the efficiency of the system with R245ca was the highest at 6.93%. This indicated that butane is the optimum refrigerant for application in the basic binary cycle, and that it is reasonable to select R245ca as the working fluid for a binary cycle with a regenerator.

ACS Style

Choon-Geun Moon; Kwang-Seok Lee; Chang-Hyo Son; Jung-In Yoon. Evaluation of the applicability of a binary cycle for the utilization of hot spring water. Journal of Advanced Marine Engineering and Technology 2018, 42, 787 -793.

AMA Style

Choon-Geun Moon, Kwang-Seok Lee, Chang-Hyo Son, Jung-In Yoon. Evaluation of the applicability of a binary cycle for the utilization of hot spring water. Journal of Advanced Marine Engineering and Technology. 2018; 42 (10):787-793.

Chicago/Turabian Style

Choon-Geun Moon; Kwang-Seok Lee; Chang-Hyo Son; Jung-In Yoon. 2018. "Evaluation of the applicability of a binary cycle for the utilization of hot spring water." Journal of Advanced Marine Engineering and Technology 42, no. 10: 787-793.

Journal article
Published: 25 October 2018 in Applied Sciences
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In this study, to investigate the performance characteristics of a seawater ice-making device, using a scraped surface double tube evaporator, experiments were conducted under various operating conditions, including inlet temperature and flow rate of seawater, evaporating temperature, and scraper rotation speed. The main results are summarized as follows: (1) The section where stable ice making is possible, is determined by the inlet temperature and the flow rate range of seawater. By controlling the flow rate of seawater, the ice packing factor (IPF) of the device can be adjusted from 0.3 to 14.7%. (2) The IPF increases in cases where the evaporating temperature decreases linearly, until −13 °C. As the temperature of refrigerant that flows into the evaporator changes, the IPF is changed. Consideration is required for these connections. (3) The IPF increases when speeding up the scraper. The minimum rotating speed of the scraper was 350 rpm in these experiments. Optimum operating conditions for the seawater ice slurry maker are established through experiments. These results will be considered as important data for designing a slurry type seawater ice-making device.

ACS Style

Hyun-Kyung Lee; Kwang-Hwan Choi; Jung-In Yoon; Choon-Geun Moon; Min-Ju Jeon; Joon-Hyuk Lee; Kwang-Seok Lee; Chang-Hyo Son. Performance Characteristics of a Seawater Ice-Making Device Using a Scraped Surface Double Tube Evaporator. Applied Sciences 2018, 8, 2063 .

AMA Style

Hyun-Kyung Lee, Kwang-Hwan Choi, Jung-In Yoon, Choon-Geun Moon, Min-Ju Jeon, Joon-Hyuk Lee, Kwang-Seok Lee, Chang-Hyo Son. Performance Characteristics of a Seawater Ice-Making Device Using a Scraped Surface Double Tube Evaporator. Applied Sciences. 2018; 8 (11):2063.

Chicago/Turabian Style

Hyun-Kyung Lee; Kwang-Hwan Choi; Jung-In Yoon; Choon-Geun Moon; Min-Ju Jeon; Joon-Hyuk Lee; Kwang-Seok Lee; Chang-Hyo Son. 2018. "Performance Characteristics of a Seawater Ice-Making Device Using a Scraped Surface Double Tube Evaporator." Applied Sciences 8, no. 11: 2063.

Original
Published: 08 October 2018 in Heat and Mass Transfer
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In this paper, R404 refrigeration system is evaluated to understand the exergy characteristics of an indirect refrigeration system for R404A that adopted CO2 as a secondary refrigerant. This provides basic data for the optimal design of indirect refrigeration system for the R404A. The results are summarized as follows. It was confirmed that the system’s exergy loss increased as the R404A condensation temperature, the CO2 cooler temperature difference, and the CO2 mass flow rate increased under a fixed experimental condition. However, the system’s exergy loss decreased as the CO2 evaporation temperature increased. It was also found that the exergy loss of the R404A refrigeration system was higher than that of the CO2 secondary refrigerant system. It was also confirmed that total exergy loss of the R404A refrigeration system and the indirect refrigeration system tended to be inversely related to the coefficient of performance. Regardless of any experimental conditions, the exergy loss rate of components was the largest in the compressor, followed by the R404A condenser, the expansion valve, the internal heat exchanger, the CO2 cooler, the CO2 evaporator and the pump. Therefore, in conclusion, it is necessary to reduce exergy loss in the compressor and the R404A condenser to improve the overall performance of this system.

ACS Style

Wen-Bin Yi; Kwang-Hwan Choi; Jung-In Yoon; Chang-Hyo Son; Soo-Jung Ha; Min-Ju Jeon. Exergy characteristics of R404A indirect refrigeration system using CO2 as a secondary refrigerant. Heat and Mass Transfer 2018, 55, 1133 -1142.

AMA Style

Wen-Bin Yi, Kwang-Hwan Choi, Jung-In Yoon, Chang-Hyo Son, Soo-Jung Ha, Min-Ju Jeon. Exergy characteristics of R404A indirect refrigeration system using CO2 as a secondary refrigerant. Heat and Mass Transfer. 2018; 55 (4):1133-1142.

Chicago/Turabian Style

Wen-Bin Yi; Kwang-Hwan Choi; Jung-In Yoon; Chang-Hyo Son; Soo-Jung Ha; Min-Ju Jeon. 2018. "Exergy characteristics of R404A indirect refrigeration system using CO2 as a secondary refrigerant." Heat and Mass Transfer 55, no. 4: 1133-1142.

Journal article
Published: 30 September 2018 in Journal of Advanced Marine Engineering and Technology
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히트펌프는 낮은 열원에서 높은 열원으로 열을 옮기는 장치이다. 최근에는 히트펌프의 효율을 높이기 위하여 응답속도가 우수한 전자식 팽창밸브가 사용되고 있다. 현재 전자식 팽창밸브 및 히트펌프에 관한 연구는 많이 있지만 각각의 상세한 데이터 분석은 많이 존재하지 않는다. 따라서 본 연구에서는 전자식과 온도식 팽창밸브를 적용한 히트펌프의 성능 특성을 비교하고자 한다. 실험 장치는 압축기, 사방밸브, 응축기, 체크밸브, 수액기, 팽창밸브, 증발기와 기액 분리기로 구성되었다. 실험은 증발기 열원수 온도에 따라서 증발 압력, 응축 압력, 질량 유량, 냉각 용량, 압축기 소비 전력, COP에 대하여 진행하였다. 히트펌프에서 증발기 열원수 온도의 변화는 시스템의 냉방 능력 및 COP에 영향을 주는 것을 확인하였다. 이에 따라 증발기 열원수 온도를 조절하는 것은 에너지 절약에 도움이 된다. 그리고 온도식 팽창밸브의 경우 전자식 팽창밸브에 비해 부하 변동 시, 냉방능력, COP가 낮음을 확인하였다. 온도식 팽창밸브가 적용된 히트펌프는 스프링 압력을 조절하는 것이 시스템 성능 향상에 도움이 될 것이라 생각된다.

ACS Style

Chang-Hyo Son; Kwang-Hwan Choi; Soo-Jung Ha; Min-Ju Jeon; Sung-Hyeon Park; Dae-Ho Choi; Sang-Bong Lee; Jung-In Yoon. Performance comparison of heat pump with electronic and thermostatic expansion valve according to temperature variation of evaporator heat source. Journal of Advanced Marine Engineering and Technology 2018, 42, 518 -523.

AMA Style

Chang-Hyo Son, Kwang-Hwan Choi, Soo-Jung Ha, Min-Ju Jeon, Sung-Hyeon Park, Dae-Ho Choi, Sang-Bong Lee, Jung-In Yoon. Performance comparison of heat pump with electronic and thermostatic expansion valve according to temperature variation of evaporator heat source. Journal of Advanced Marine Engineering and Technology. 2018; 42 (7):518-523.

Chicago/Turabian Style

Chang-Hyo Son; Kwang-Hwan Choi; Soo-Jung Ha; Min-Ju Jeon; Sung-Hyeon Park; Dae-Ho Choi; Sang-Bong Lee; Jung-In Yoon. 2018. "Performance comparison of heat pump with electronic and thermostatic expansion valve according to temperature variation of evaporator heat source." Journal of Advanced Marine Engineering and Technology 42, no. 7: 518-523.

Journal article
Published: 30 August 2018 in Journal of the Korean Society for Power System Engineering
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ACS Style

Jung-In Yoon; Chang-Hyo Son; Choon-Geun Moon; Ho-Saeng Lee; Jung-Hyun Moon; Hyeon-Ju Kim; Kwang-Seok Lee. Performance Analysis of Ejector-Pump Thermal Energy Conversion System Applying Feed Liquid Heater. Journal of the Korean Society for Power System Engineering 2018, 22, 89 -95.

AMA Style

Jung-In Yoon, Chang-Hyo Son, Choon-Geun Moon, Ho-Saeng Lee, Jung-Hyun Moon, Hyeon-Ju Kim, Kwang-Seok Lee. Performance Analysis of Ejector-Pump Thermal Energy Conversion System Applying Feed Liquid Heater. Journal of the Korean Society for Power System Engineering. 2018; 22 (4):89-95.

Chicago/Turabian Style

Jung-In Yoon; Chang-Hyo Son; Choon-Geun Moon; Ho-Saeng Lee; Jung-Hyun Moon; Hyeon-Ju Kim; Kwang-Seok Lee. 2018. "Performance Analysis of Ejector-Pump Thermal Energy Conversion System Applying Feed Liquid Heater." Journal of the Korean Society for Power System Engineering 22, no. 4: 89-95.

Conference paper
Published: 23 April 2018 in MATEC Web of Conferences
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In these days, many studies on ocean fisheries have been conducted for developing their own industries. Especially, the efforts of using seawater cooling system were actively conducted to keep the caught fisheries fresh, increase the catches, and decrease the manpower. The purpose of this study is to suggest design criteria of seawater cooling system using the flood-type evaporator. In this study, the seawater cooling system using flooded-type evaporator was manufactured as a prototype capacitating 15kW. This study examined performance of the seawater cooling system and then compared the performance with the system capacitating 163kW and 238kW, which is actually being loaded on the fishery boats. In addition, heat transfer characteristics of the flooded-type evaporator used in the equipment are analysed.

ACS Style

Jung-In Yoon; Chang-Hyo Son; Hyung-Min Han; Kwang-Seok Lee; Jung-Mok Lee; In-Duck You. Heat Transfer Characteristics of Flooded Type Evaporator for Seawater Cooling System. MATEC Web of Conferences 2018, 167, 02014 .

AMA Style

Jung-In Yoon, Chang-Hyo Son, Hyung-Min Han, Kwang-Seok Lee, Jung-Mok Lee, In-Duck You. Heat Transfer Characteristics of Flooded Type Evaporator for Seawater Cooling System. MATEC Web of Conferences. 2018; 167 ():02014.

Chicago/Turabian Style

Jung-In Yoon; Chang-Hyo Son; Hyung-Min Han; Kwang-Seok Lee; Jung-Mok Lee; In-Duck You. 2018. "Heat Transfer Characteristics of Flooded Type Evaporator for Seawater Cooling System." MATEC Web of Conferences 167, no. : 02014.

Original
Published: 18 April 2018 in Heat and Mass Transfer
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In this study, to investigate the performance characteristics of vapor injection refrigeration system with an economizer at an intermediate pressure, the vapor injection refrigeration system was analyzed under various experiment conditions. As a result, the optimum design data of the vapor injection refrigeration system with an economizer were obtained. The findings from this study can be summarized as follows. The mass flow rate through the compressor increases with intermediate pressure. The compression power input showed an increasing trend under all the test conditions. The evaporation capacity increased and then decreased at the intermediate pressure, and as such, it became maximum at the given intermediate pressure. The increased mass flow rate of the by-passed refrigerant enhanced the evaporation capacity at the low medium pressure range, but the increased saturation temperature limited the subcooling degree of the liquid refrigerant after the application of the economizer when the intermediate pressure kept rising, and degenerated the evaporation capacity. The coefficient of performance (COP) increased and then decreased with respect to the intermediate pressures under all the experiment conditions. Nevertheless, there was an optimum intermediate pressure for the maximum COP under each experiment condition. Therefore, the optimum intermediate pressure in this study was found at −99.08 kPa, which is the theoretical standard medium pressure under all the test conditions.

ACS Style

Chang-Uk Moon; Kwang-Hwan Choi; Jung-In Yoon; Young-Bok Kim; Chang-Hyo Son; Soo-Jung Ha; Min-Ju Jeon; Sang-Young An; Joon-Hyuk Lee. Experimental study on the performance of the vapor injection refrigeration system with an economizer for intermediate pressures. Heat and Mass Transfer 2018, 54, 3059 -3069.

AMA Style

Chang-Uk Moon, Kwang-Hwan Choi, Jung-In Yoon, Young-Bok Kim, Chang-Hyo Son, Soo-Jung Ha, Min-Ju Jeon, Sang-Young An, Joon-Hyuk Lee. Experimental study on the performance of the vapor injection refrigeration system with an economizer for intermediate pressures. Heat and Mass Transfer. 2018; 54 (10):3059-3069.

Chicago/Turabian Style

Chang-Uk Moon; Kwang-Hwan Choi; Jung-In Yoon; Young-Bok Kim; Chang-Hyo Son; Soo-Jung Ha; Min-Ju Jeon; Sang-Young An; Joon-Hyuk Lee. 2018. "Experimental study on the performance of the vapor injection refrigeration system with an economizer for intermediate pressures." Heat and Mass Transfer 54, no. 10: 3059-3069.

Conference paper
Published: 06 April 2018 in MATEC Web of Conferences
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Barium sulfate (BaSO4) with fine sizes is important for many applications. Barium Sulfate (BaSO4) is suitable for applications as diverse as whiteness, inertness and high density. Many different approaches have been reported for the preparation of nanoparticles BaSO4 including the addition of different additives. Aims of this study to synthesize barium sulfate (BaSO4) from natrium sulfate and barium chloride with the modification of the mixing speed, temperature and additive concentration variations. This study conducted in Diponegoro University Laboratorium. The sample were characterized by a number of different methodologies, including XRD and SEM-EDS. The higher the temperature of the mass of the crust that formed more and more. The results showed a temperature of 40°C was obtained crust mass greater than at 30°C. The addition of the additive citric acid to 20 ppm does not have enough influence to lower the formation of crust mass. From the SEM image, it is clear that the particle size is less than 10 μm.

ACS Style

Waleed Ali; Wahyu Putranto; Stefanus Muryanto; Athanasius Bayuseno; Van Trong Nguyen; Yong-Woon Choi; Jung-In Yoon; Kwang-Hwan Choi; Chang-Hyo Son; Young-Bok Kim. Synthesis of barium sulfate in the variation of temperature and additive concentration. MATEC Web of Conferences 2018, 159, 01056 .

AMA Style

Waleed Ali, Wahyu Putranto, Stefanus Muryanto, Athanasius Bayuseno, Van Trong Nguyen, Yong-Woon Choi, Jung-In Yoon, Kwang-Hwan Choi, Chang-Hyo Son, Young-Bok Kim. Synthesis of barium sulfate in the variation of temperature and additive concentration. MATEC Web of Conferences. 2018; 159 ():01056.

Chicago/Turabian Style

Waleed Ali; Wahyu Putranto; Stefanus Muryanto; Athanasius Bayuseno; Van Trong Nguyen; Yong-Woon Choi; Jung-In Yoon; Kwang-Hwan Choi; Chang-Hyo Son; Young-Bok Kim. 2018. "Synthesis of barium sulfate in the variation of temperature and additive concentration." MATEC Web of Conferences 159, no. : 01056.

Journal article
Published: 31 March 2018 in Journal of Advanced Marine Engineering and Technology
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지구온난화에 따른 해양환경의 변화로 어자원 확보를 위한 다양한 방안들이 강구되고 있다. 선망어선을 통한 어획물의 운반시 선도유지를 위하여 기존에는 얼음과 소금을 어창에 공급하는 방식이 사용되고 있었다. 어획물의 선도향상을 위해 직접 해수를 냉각해서 공급하는 선박용 해수냉각시스템 개발은 대단히 중요하다. 이러한 필요성을 바탕으로 만액식 증발기를 적용한 해수냉각시스템을 개발하고 있으며, 이에 대한 증발기 성능 특성을 냉매 R134a, R22를 적용하여 비교하였다. 먼저 시뮬레이션 프로그램인 HYSYS 프로그램을 이용하여 성능을 예측하였으며, 실험값과의 차이는 약 10% 정도로 일치하였다. R22, R134a 냉매 적용시 실험 및 HYSYS결과는 압축기 전후 압력, 냉매 순환량, 응축 및 증발 열량, 압축 동력, COP 등 대체적으로 같은 경향을 나타냈다. 시스템 성능을 나타내는 지표인 COP는 냉매 R22 적용 시, 냉매 R134a 비해 약 22% 증가함을 보였다.

ACS Style

Chang-Hyo Son; Kwang-Hwan Choi; Suk-Ho Jung; Hyung-Min Han; Jung-Mok Lee; Jung-In Yoon. Performance comparison of seawater cooling system using refrigerants R22 and R134a. Journal of Advanced Marine Engineering and Technology 2018, 42, 155 -160.

AMA Style

Chang-Hyo Son, Kwang-Hwan Choi, Suk-Ho Jung, Hyung-Min Han, Jung-Mok Lee, Jung-In Yoon. Performance comparison of seawater cooling system using refrigerants R22 and R134a. Journal of Advanced Marine Engineering and Technology. 2018; 42 (3):155-160.

Chicago/Turabian Style

Chang-Hyo Son; Kwang-Hwan Choi; Suk-Ho Jung; Hyung-Min Han; Jung-Mok Lee; Jung-In Yoon. 2018. "Performance comparison of seawater cooling system using refrigerants R22 and R134a." Journal of Advanced Marine Engineering and Technology 42, no. 3: 155-160.

Original articles
Published: 26 March 2018 in Heat Transfer Engineering
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Most of fishing vessels pour plain ice into fish storages to maintain freshness of catches, which causes varying storage temperatures and changes in the salinity, and damages in catches. In contrast, seawater cooling systems that directly chill the seawater in the storage provide seawater with a constant temperature and salinity. Furthermore, the application of a flood-type evaporator enables the size of the system to be reduced due to the enhanced heat transfer performance of the evaporator. This study conducts experimental research on the boiling heat transfer characteristics of flood-type evaporators under various operating conditions. The test section of the experiment consists of the flood-type evaporator including tubes made of three different materials and having two different shapes, and R134a and R22 are used. As a result, low-fin tubes were found to present a higher heat transfer coefficient than that of the plain tube. Aluminum-brass low-fin tubes exhibited relatively 4.5% higher heat transfer coefficient than that of copper-nickel low-fin tubes when R22 was used, and relatively 5.3% higher value when the R134a was used. When R22 was used with an aluminum-brass low-fin tube, the heat transfer coefficient was relatively 6.9% higher than that when using R134a.

ACS Style

Jung-In Yoon; Chang-Hyo Son; Kwang-Hwan Choi; Suk-Ho Jung; Hyung-Min Han; Sung-Hoon Seol. Heat Transfer Characteristics of Flood-type Evaporator Using R22 and R134a for Fishing Vessels. Heat Transfer Engineering 2018, 40, 985 -996.

AMA Style

Jung-In Yoon, Chang-Hyo Son, Kwang-Hwan Choi, Suk-Ho Jung, Hyung-Min Han, Sung-Hoon Seol. Heat Transfer Characteristics of Flood-type Evaporator Using R22 and R134a for Fishing Vessels. Heat Transfer Engineering. 2018; 40 (12):985-996.

Chicago/Turabian Style

Jung-In Yoon; Chang-Hyo Son; Kwang-Hwan Choi; Suk-Ho Jung; Hyung-Min Han; Sung-Hoon Seol. 2018. "Heat Transfer Characteristics of Flood-type Evaporator Using R22 and R134a for Fishing Vessels." Heat Transfer Engineering 40, no. 12: 985-996.

Journal article
Published: 31 January 2018 in Journal of Advanced Marine Engineering and Technology
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어획물의 보관, 유통 과정에서 해수를 원수로 하는 샤베트형 얼음의 이용은 어획물의 선도 유지와 품질 면에서 좋은 방식으로 평가되고 있다. 하지만, 국내의 보관 및 유통 과정에서는 90% 이상이 담수 각 빙을 사용하며 이에 따라 품질과 신선도 측면에서 마이너스 효과를 보이고 있다. 본 연구에서는 소용량(0.55 Ton/day) 스크래퍼식 제빙기를 대상으로 해수의 입구 온도와 유량, 스크래퍼 회전수, 냉매의 증발온도, 염분 농도를 변화시켜가며 실험을 실시하여 샤베트형 해수빙의 형태와 제빙량, 빙충전율(IPF)을 알아보았으며, 그 결과는 다음과 같다. (1) 생성된 샤베트형 해수빙은 흰 색의 유동성을 가진 유체로, 얼음 입자의 크기는 직경 0.2 mm ~ 0.3 mm로 측정되었다. (2) 해수의 입구 온도가 낮을수록, 유량이 적을수록 IPF는 증가하며, 표준 조건에서 제빙량은 0.55 Ton/day를 보였다. (3) 스크래퍼 회전수가 증가할수록 IPF는 증가하며 해수의 염분 농도에 따른 IPF 변화는 미미하다. (4) 냉매의 증발온도가 낮아질수록 IPF는 증가하는 경향을 보인다. 이러한 결과는 샤베트형 해수 제빙장치 설계를 위한 중요한 자료가 되리라 판단된다.

ACS Style

Jung-In Yoon; Hyun-Kyung Lee; Min-Ju Jeon; Choon-Geun Moon; Kwang-Hwan Choi; Chang-Hyo Son. Experimental study on the characteristics of a sherbet type seawater ice maker using scraper. Journal of Advanced Marine Engineering and Technology 2018, 42, 10 -15.

AMA Style

Jung-In Yoon, Hyun-Kyung Lee, Min-Ju Jeon, Choon-Geun Moon, Kwang-Hwan Choi, Chang-Hyo Son. Experimental study on the characteristics of a sherbet type seawater ice maker using scraper. Journal of Advanced Marine Engineering and Technology. 2018; 42 (1):10-15.

Chicago/Turabian Style

Jung-In Yoon; Hyun-Kyung Lee; Min-Ju Jeon; Choon-Geun Moon; Kwang-Hwan Choi; Chang-Hyo Son. 2018. "Experimental study on the characteristics of a sherbet type seawater ice maker using scraper." Journal of Advanced Marine Engineering and Technology 42, no. 1: 10-15.

Journal article
Published: 01 November 2017 in Defect and Diffusion Forum
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This study proposes a system called 'dual system of cooling-thermal energy conversion applying ejector', which practically applies an ejector to an ocean thermal energy conversion (OTEC) system. The proposed system presents higher system efficiency, owing to the application of an ejector, and reduced initial and operating costs. The main results, obtained from simulation analysis, are as follows: the cooling capacity tended to decrease as the entrainment ratio increased, and the system using R134a generally presented the highest cooling capacity and COP. In terms of generation system, the highest turbine gross power was obtained when the R134a working fluid was applied. The efficiency of the system decreased as the entrainment ratio increased. Finally, the application of the ejector enhanced the efficiency of the generation system, using R134a, by approximately 50%, from 4.73% to 7.10% at the entrainment ratio of 0.1.

ACS Style

Jung In Yoon; Ho Saeng Lee; Chang Hyo Son; Sung Hoon Seol; Hyeon Ju Kim; Jung Hyun Moon. Effect of Entrainment Ratio and Subcooling Degree on Dual System of Cooling-Thermal Energy Conversion Applying Ejector. Defect and Diffusion Forum 2017, 379, 140 -148.

AMA Style

Jung In Yoon, Ho Saeng Lee, Chang Hyo Son, Sung Hoon Seol, Hyeon Ju Kim, Jung Hyun Moon. Effect of Entrainment Ratio and Subcooling Degree on Dual System of Cooling-Thermal Energy Conversion Applying Ejector. Defect and Diffusion Forum. 2017; 379 ():140-148.

Chicago/Turabian Style

Jung In Yoon; Ho Saeng Lee; Chang Hyo Son; Sung Hoon Seol; Hyeon Ju Kim; Jung Hyun Moon. 2017. "Effect of Entrainment Ratio and Subcooling Degree on Dual System of Cooling-Thermal Energy Conversion Applying Ejector." Defect and Diffusion Forum 379, no. : 140-148.