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Performance enhancement of heat recovery from engine exhaust gas using corona wind
Shin, Dong Ho,Kim, Sunuk,Ko, Han Seo,Shin, Youhwan Elsevier 2018 Energy conversion and management Vol.173 No.-
<P><B>Abstract</B></P> <P>This study develops a new type of heat exchanger with tungsten wires to produce a corona wind. Experimental data are presented for the velocity and temperature of the corona flow from wires to parallel electrodes with respect to the applied voltage and power. Additionally, a gas engine power generation system is manufactured, and its power generation efficiency is tested according to the fuel gas volume fraction between methane and carbon dioxide. Furthermore, an exhaust gas heat recovery system is fabricated using the proposed heat exchanger. A prototype of the corona wind heat exchanger is manufactured, and its enhanced heat recovery efficiency is tested with the gas engine. The corona wind heat exchanger operates well under the available exhaust gas conditions; it increases the temperature of 1 L/min water flow by 45 °C by recovering 2 kW of heat energy from the exhaust gas. The total power production efficiency was increased from 29% to 47%. The results confirm that the proposed corona wind heat exchanger can be applied to the gas engines to greatly enhance their heat recovery efficiency.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A new type of heat exchanger with tungsten wires to induce corona wind is reported. </LI> <LI> An exhaust gas heat recovery system is fabricated using the proposed heat exchanger. </LI> <LI> A prototype increases the temperature of 1 L/min water flow by 45 °C by heat recovery. </LI> <LI> Results confirm that the prototype enhances 18% of heat recovery efficiency. </LI> </UL> </P>
Development of a calorific value controller using bimetal fin channel for PCM heat storage
Shin, Dong Ho,Kim, Sunuk,Kim, San,Ko, Han Seo,Shin, Youhwan Elsevier 2018 Energy conversion and management Vol.173 No.-
<P><B>Abstract</B></P> <P>This paper reports on the development of a new type of heat exchanger with bimetal fins for controlling the calorific value of water through phase change material (PCM) heat storage. It presents detailed numerical and experimental data on the velocity and temperature of water flow in a channel equipped with bimetal fins on the wall. Computational fluid dynamics and particle image velocimetry are used to analyze the flow behavior around the bimetal fins. The bimetal fins increase the insulation performance at the wall, such that the heat loss rate is decreases by a maximum of 56%. Furthermore, the flow rate and calorific value can be controlled at 10 L/min and 50 kJ, respectively. Consequently, the discharging-time during which hot water can be generated increases by a maximum of 70 min.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A bimetal fin channel is applied to heat storage with a phase change material. </LI> <LI> The bimetal fins control the flow rate and calorific value at 10 L/min and 50 kJ. </LI> <LI> Heat loss rate at the bimetal fins decreases by a maximum of 56%. </LI> <LI> Operating time during which hot water is generated increases by 70 min. </LI> </UL> </P>
Extracellular Matrix Revisited: Roles in Tissue Engineering
Kim, Youhwan,Ko, Hyojin,Kwon, Ik Keun,Shin, Kwanwoo Korean Continence Society 2016 International Neurourology Journal Vol.20 No.1
<P>The extracellular matrix (ECM) is a heterogeneous, connective network composed of fibrous glycoproteins that coordinate <I>in vivo</I> to provide the physical scaffolding, mechanical stability, and biochemical cues necessary for tissue morphogenesis and homeostasis. This review highlights some of the recently raised aspects of the roles of the ECM as related to the fields of biophysics and biomedical engineering. Fundamental aspects of focus include the role of the ECM as a basic cellular structure, for novel spontaneous network formation, as an ideal scaffold in tissue engineering, and its essential contribution to cell sheet technology. As these technologies move from the laboratory to clinical practice, they are bound to shape the vast field of tissue engineering for medical transplantations.</P>