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Prof. Dr. Young Il Kim
Seoul National University of Science and Technology

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0 Energy Simulation
0 HVAC
0 Refrigeration
0 heat pump
0 Thermal-Fluid Sciences

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Journal article
Published: 15 March 2021 in Sustainability
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To delay fossil energy depletion and implement the Paris Climate Change Accord, the South Korean government is attempting to reduce greenhouse gas emissions with the establishment of the 2030 Roadmap. The insulation performance of external walls is being continuously enhanced in the architectural domain. However, Korea’s policy and construction market focuses only on the heat resistance of buildings’ external walls to enhance the insulation performance, leading to an increased thickness of the insulation materials. In this study, the relationship between the surface reflectivity and insulation thickness of external walls was examined to formulate an effective insulation strategy for buildings in Korea. Office buildings of 12 regions in the Korean Peninsula were considered. The dynamic energy simulation program EnergyPlus was used to perform the heating and cooling load analyses. The present worth method was adopted to perform the economic analysis. The analysis of the cooling and heating loads indicated that a change occurred not only in terms of the latitude but also between the Eastern and Western regions. The energy consumption could be reduced by increasing the reflectivity in the Southern region and lowering the reflectivity in the Northern region, based on the total load. In addition, a higher latitude corresponded to a higher energy saving effect owing to the increased insulation thickness. In the case of Jeju Island and Busan, regions with a relatively large cooling load and small heating load, the total load is little affected by insulation thickness at high reflectivity. If the external skin was considered to have the optimal reflectivity, the regions for optimal insulation thickness could be divided into three categories: north, central and south.

ACS Style

Jung Kim; Young Kim. Optimal Combination of External Wall Insulation Thickness and Surface Solar Reflectivity of Non-Residential Buildings in the Korean Peninsula. Sustainability 2021, 13, 3205 .

AMA Style

Jung Kim, Young Kim. Optimal Combination of External Wall Insulation Thickness and Surface Solar Reflectivity of Non-Residential Buildings in the Korean Peninsula. Sustainability. 2021; 13 (6):3205.

Chicago/Turabian Style

Jung Kim; Young Kim. 2021. "Optimal Combination of External Wall Insulation Thickness and Surface Solar Reflectivity of Non-Residential Buildings in the Korean Peninsula." Sustainability 13, no. 6: 3205.

Journal article
Published: 14 November 2020 in Sustainability
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To save electricity consumption in university buildings, we measured and compared the amount of electricity use with and without motion detection sensors and room management systems in underground parking lots, lecture rooms, and dormitories of a university building. The underground parking lots and lecture rooms were measured as sensors were applied and then removed during the semester. University classes are held weekly, so it can be assumed that the number of cars and people’s entering and using conditions are the same. In the university’s underground parking lots, a daily electricity savings of 39.5 Wh/(m2 day) of lights was achieved, with a savings rate of 77.6%. In the lecture rooms, these values were 25.0 Wh/(m2 day) and 32.4%, respectively. Savings in the use of air conditioning were 55.0 Wh/(m2 day), with a savings rate of 27.9%. Dormitories use electrical energy for lighting, heating, and socket outlets. As a reference group, 120 rooms were selected and the room management system was applied to 10 samples. For dormitories, daily electricity savings of 142.4 Wh/(m2 day) were achieved, with a savings rate of 28.2%. Thus, this study demonstrated that applying motion detection sensors and room management systems saved significant electrical energy in university underground parking lots, lecture rooms, and dormitories.

ACS Style

Jong-Won Lee; Young Kim. Energy Saving of a University Building Using a Motion Detection Sensor and Room Management System. Sustainability 2020, 12, 9471 .

AMA Style

Jong-Won Lee, Young Kim. Energy Saving of a University Building Using a Motion Detection Sensor and Room Management System. Sustainability. 2020; 12 (22):9471.

Chicago/Turabian Style

Jong-Won Lee; Young Kim. 2020. "Energy Saving of a University Building Using a Motion Detection Sensor and Room Management System." Sustainability 12, no. 22: 9471.

Journal article
Published: 30 September 2018 in Korean Journal of Air-Conditioning and Refrigeration Engineering
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ACS Style

Gi Duk Jung; Jong Jun Park; Young Il Kim; Sean Hay Kim. A Study on the Reduction of Carbon Dioxide Concentration in Indoor Theme Park for Children. Korean Journal of Air-Conditioning and Refrigeration Engineering 2018, 30, 425 -434.

AMA Style

Gi Duk Jung, Jong Jun Park, Young Il Kim, Sean Hay Kim. A Study on the Reduction of Carbon Dioxide Concentration in Indoor Theme Park for Children. Korean Journal of Air-Conditioning and Refrigeration Engineering. 2018; 30 (9):425-434.

Chicago/Turabian Style

Gi Duk Jung; Jong Jun Park; Young Il Kim; Sean Hay Kim. 2018. "A Study on the Reduction of Carbon Dioxide Concentration in Indoor Theme Park for Children." Korean Journal of Air-Conditioning and Refrigeration Engineering 30, no. 9: 425-434.

Journal article
Published: 01 May 2018 in Journal of Clean Energy Technologies
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ACS Style

A Young Nam; Jong Jun Park; Young Il Kim; Kwang Seop Chung. Study on the Change of South Korea Outdoor Design Temperature according to the Assigned Period. Journal of Clean Energy Technologies 2018, 6, 227 -231.

AMA Style

A Young Nam, Jong Jun Park, Young Il Kim, Kwang Seop Chung. Study on the Change of South Korea Outdoor Design Temperature according to the Assigned Period. Journal of Clean Energy Technologies. 2018; 6 (3):227-231.

Chicago/Turabian Style

A Young Nam; Jong Jun Park; Young Il Kim; Kwang Seop Chung. 2018. "Study on the Change of South Korea Outdoor Design Temperature according to the Assigned Period." Journal of Clean Energy Technologies 6, no. 3: 227-231.

Journal article
Published: 30 April 2018 in Korean Journal of Air-Conditioning and Refrigeration Engineering
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Mohair is widely used as an airtight material for filling the gap between a window frame and sash. The purpose of this study is to investigate infiltration rate and opening force of sliding windows according to the mohair installation conditions. Infiltration experimental apparatus was set up, and the experimental results were applied to windows to find a correlation between infiltration rates and opening forces. When 4 rows of mohair were installed, the infiltration rate increase became 27.1% per clearance length increase of 1 mm, and the infiltration rate decrease became 5.7% per shortened length increase of 0.1 mm. For 4 rows of mohair, the opening force decreased by 28.2% as the clearance increased by 1 mm, and it increased by 9.3% as the shortened length increased by 0.1 mm.

ACS Style

Seung Jae Kim; Jong Jun Park; Young Il Kim. Experimental Research of Window Air Tightness and Opening Force with Respect to Mohair Number, Clearance and Shortened Length. Korean Journal of Air-Conditioning and Refrigeration Engineering 2018, 30, 195 -203.

AMA Style

Seung Jae Kim, Jong Jun Park, Young Il Kim. Experimental Research of Window Air Tightness and Opening Force with Respect to Mohair Number, Clearance and Shortened Length. Korean Journal of Air-Conditioning and Refrigeration Engineering. 2018; 30 (4):195-203.

Chicago/Turabian Style

Seung Jae Kim; Jong Jun Park; Young Il Kim. 2018. "Experimental Research of Window Air Tightness and Opening Force with Respect to Mohair Number, Clearance and Shortened Length." Korean Journal of Air-Conditioning and Refrigeration Engineering 30, no. 4: 195-203.

Journal article
Published: 20 February 2018 in International Journal of Ventilation
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Infiltration through windows accounts for a significant heat loss in buildings during winter, leading to the need to minimize uncontrolled air flow. Improvement of window air tightness is important for reducing heat loss by infiltration through windows. In this study, infiltration is measured for general sliding (GS), parallel sliding tilt (PST) and lift sliding (LS) windows according to ASTM E283, a standard for window infiltration measurement. Measured window infiltration data, pressure coefficients calculated with STAR-CCM+ and outdoor weather data of Seoul are used in CONTAM, a network based ventilation simulation program to estimate infiltration during winter season for three sliding window types and their locations in a building. The results show that infiltration is highest for east located general sliding type window, and lowest for west located parallel sliding tilt window. Monthly analysis shows that for an east located window, infiltration is highest during January and lowest during December.

ACS Style

Jong Jun Park; Young Il Kim. Study of infiltration through sliding windows with respect to closing mechanisms and their locations in a building during winter season. International Journal of Ventilation 2018, 18, 220 -232.

AMA Style

Jong Jun Park, Young Il Kim. Study of infiltration through sliding windows with respect to closing mechanisms and their locations in a building during winter season. International Journal of Ventilation. 2018; 18 (3):220-232.

Chicago/Turabian Style

Jong Jun Park; Young Il Kim. 2018. "Study of infiltration through sliding windows with respect to closing mechanisms and their locations in a building during winter season." International Journal of Ventilation 18, no. 3: 220-232.

Journal article
Published: 10 February 2016 in Korean Journal of Air-Conditioning and Refrigeration Engineering
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An Experimental Study of Window Air Tightness according to Filling Piece Shapes Window;Filling piece;Infiltration;Air tightness; To study the effect of installation and the shapes of filling pieces used for windows on the infiltration rate, infiltration tests were performed with two types of sliding windows and two shapes for the filling pieces. Infiltration occurred most at the top and bottom parts of the center location where two windows overlap, indicating the necessity of a filling piece to be installed at these locations. Infiltration velocity is proportional to the square root of the pressure difference, complying well with the theoretical correlation. Infiltration is reduced about 50% by the filling piece installation. This study shows that filling pieces are essential and their shapes play significant roles in reducing the infiltration of windows.

ACS Style

Yura Yun; Jong-Jun Park; Young Il Kim; Kwang-Seop Chung. An Experimental Study of Window Air Tightness according to Filling Piece Shapes. Korean Journal of Air-Conditioning and Refrigeration Engineering 2016, 28, 63 -68.

AMA Style

Yura Yun, Jong-Jun Park, Young Il Kim, Kwang-Seop Chung. An Experimental Study of Window Air Tightness according to Filling Piece Shapes. Korean Journal of Air-Conditioning and Refrigeration Engineering. 2016; 28 (2):63-68.

Chicago/Turabian Style

Yura Yun; Jong-Jun Park; Young Il Kim; Kwang-Seop Chung. 2016. "An Experimental Study of Window Air Tightness according to Filling Piece Shapes." Korean Journal of Air-Conditioning and Refrigeration Engineering 28, no. 2: 63-68.

Research article
Published: 08 July 2014 in Indoor and Built Environment
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Concurrent supply and exhaust ventilation (CSEV) has been developed to effectively exhaust heat and contamination from the kitchen. The objective of this research was to investigate the performance variation of this system with respect to air flow rates. CSEV system can block the contaminated air from entering the inner space by supplying fresh air horizontally in the ceilings towards the hood where the overflowed contaminated gas tends to diffuse to inner part of the room. The system captures contaminated air in an area near the ceiling and this captured air is then exhausted through the ceiling outlet. For quantitative evaluation, heat and gas capture efficiencies were defined and calculated. Experiments were conducted to compute heat and gas capture efficiencies based on the temperature and SF6 concentration data that were measured at the exhaust locations. To find optimum operation conditions for a CSEV system, numerical analysis was carried out. The numerical results were in good agreement with the experimental values. Maximum differences between the two methods are 17% for hood system and 10% for CSEV. Both heat and gas capture efficiencies would increase as exhaust flow rate of the hood increases. However, the optimum supply flow rate of ceiling nozzle was found to be 100 m3/h for maximum efficiency. This optimum flow rate condition would improve removing heat and contamination from the kitchen for better indoor air quality.

ACS Style

Kun Woo Yi; Young Il Kim; Gwi-Nam Bae. Effect of air flow rates on concurrent supply and exhaust kitchen ventilation system. Indoor and Built Environment 2014, 25, 180 -190.

AMA Style

Kun Woo Yi, Young Il Kim, Gwi-Nam Bae. Effect of air flow rates on concurrent supply and exhaust kitchen ventilation system. Indoor and Built Environment. 2014; 25 (1):180-190.

Chicago/Turabian Style

Kun Woo Yi; Young Il Kim; Gwi-Nam Bae. 2014. "Effect of air flow rates on concurrent supply and exhaust kitchen ventilation system." Indoor and Built Environment 25, no. 1: 180-190.