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강채동(Chaedong Kang),이동원(Dong-Won Lee),백종현(Jong-Hyeon Peck),이수양(Soo-Yang Lee),서정식(Jeong-sik Seo) 대한설비공학회 2021 대한설비공학회 학술발표대회논문집 Vol.2021 No.6
Along with the changed power demand system, changes in consumer preferences are further shrinking the thermal energy storage system(TES) market. Moreover, due to the suspension of the subsidy system required for the supply of TES, the related equipment industry is in crisis. On the other hand, variable renewable energy(VRE), i.e., unbalanced power generation by a renewable energy utilization system is gradually increasing, and the need for the development of an energy storage system(ESS) is more urgent due to unbalanced demand. Therefore, the purpose of this study is to examine the domestic and international status of TES and related incentives, and to prepare basic data that can help revitalize the TES industry in the future in line with the national energy supply and demand strategy based on carbon neutral.
인가전압에 따른 전기차용 초소형 히트펌프 냉난방 운전 특성
이대규(Daegyu Lee),이천규(Cheonkyu Lee),박동호(Dongho Park),정효재(Hyo Jae Jeong),강채동(Chaedong Kang) 대한기계학회 2020 大韓機械學會論文集B Vol.44 No.12
전기자동차의 배터리는 완충 후 사용시간에 따라 전압이 선형적으로 감소하므로 전기자동차용 히트펌프 개발을 위해 인가전압에 따른 히트펌프의 운전 특성 분석이 필요하다. 본 연구에서는 인가전압의 변화에 따른 초소형 히트펌프의 운전 특성 분석을 위한 연구를 수행하였다. 실험은 항온항습 챔버에서 냉방조건과 난방 조건으로 나뉘어 진행되었다. 외기온도는 냉방모드에서 27°C 및 35°C, 난방모드에서 24°C 및 -7°C로 각각 설정하여 실험을 수행하였다. 히트펌프에 인가되는 전압은 16V에서 32V까지 2V씩 변화를 주었다. 인가전압 증가에 따라 초소형 히트펌프의 냉·난방용량은 외기온도 27°C, 35°C, 24°C 그리고 -7°C 조건에서 각각 최대 51%, 54%, 43% 그리고 33% 증가하였다. 성능계수는 외기온도 27°C, 35°C, 24°C 그리고 -7°C 조건에서 인가전압 증가에 따라 각각 최대 35%, 39%, 22% 그리고 10% 증가하였다. It is necessary to analyze the operation characteristics of a heat pump under various applied voltages to develop a micro-heat pump for electric vehicles because the voltage of the battery in electric vehicles is linearly reduced with respect to the usage time after a full battery charge. In this study, the operation characteristics of a micro-heat pump were investigated with respect to applied voltages. Cooling and heating experiments were conducted by a using micro-heat pump in an isothermal-isohumidity control chamber. External temperatures of 27 °C and 35 °C were used for the cooling operations and 24 °C and -7 °C were used for the heating operations. The applied voltages were varied from 16 to 32 V at an interval of 2 V. As the applied voltage was increased, cooling and heating capacities increased by up to 51 %, 54 %, 43 %, and 33 % at external temperatures of 27 °C, 35 °C, 24 °C, and -7 °C, respectively. The coefficient of performance increased by up to 35 %, 39 %, 22 %, and 10 % as the applied voltage was increased at external temperatures of 27 °C, 35 °C, 24 °C, and -7 °C, respectively.
Evaluation of heat storage and release in a double shell and tube heat exchanger with a PCM layer
Donggyu Lee,CHAEDONG KANG 대한기계학회 2020 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.34 No.8
In this study, a thermal storage type heat exchanger that combines heat storage and heat exchange functions has proposed and the heat transfer characteristics of the new type of heat exchanger were analyzed through experiments. The proposed thermal storage type heat exchanger has a shell and tube structure and allows mutual heat transfer between three or more mediums, including a phase change material (PCM). This thermal storage type heat exchanger contains 52.2 kg of a PCM with a phase change temperature of 68.8 °C to provide heat storage function. The heat transfer experiment of the heat exchanger confirmed the effect of the temperature change of the heating medium under the same flow conditions. Furthermore, due to the structural characteristics of the thermal storage type double shell and tube heat exchanger (TSDHE), the phenomenon of three-medium heat exchange (hot watercold water, hot water-PCM, additional water-PCM) was verified during the experimental process. In particular, due to the PCM filled inside the heat exchanger, the cold water received a heat transfer of 3 kW or higher from the PCM for at least 5 min (maximum 33 min), even when the hot water supply (heat source) was stopped. The results of this study will be used as basic data for applying a thermal storage type evaporator to a high temperature heat pump that generates steam using industrial waste heat.
이동규(Donggyu Lee),정근면(Geunmyon Jeong),강채동(Chaedong Kang) 대한설비공학회 2016 대한설비공학회 학술발표대회논문집 Vol.2016 No.6
Recently, the interest has been increased to the efficient use for unutilized energy and the emission reduction of carbon dioxide. In particular, waste water on middle temperature is recognized to one of the representative unutilized energy, which occurs on manufacturing processes in the many manufacturers such as power, food and textile industry. The unutilized energy have a disadvantage such as the low energy utility because low energy density. Therefore, a lot of research about the system improvement combined with a heat pump were reported for the production of heat energy of high temperature of utility. However, It is important to maintain steadily heat supply from the system. A heat storage and heat exchanger is applied to the system in order to increase utilization because the heated waste water which occurred in the industry process has various flow according to time. In this article, we designed an thermal storage type heat exchanger which has a thermal storage tank and heat exchanger function as an evaporator of heat pump system. The designed thermal storage type heat exchanger has a double shell and tube structure. Moreover, it is structured to the purpose of conducting stored heat and transferring to four heat medium including a phase change material(PCM). In this article, a basic experiment was conducted in order to measure the heat transfer characteristics of the each three heat medium between PCM. And experimental results will be used as the design data for thermal storage type heat exchanger.
이동규(Donggyu Lee),서재경(Jae-Kyoung Suh),오영택(Youngtaig Oh),강채동(Chaedong Kang) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.5_1
In advance of energy crisis in recent future, the development of energy conversion system has been increased rapidly to practical use of renewable energy. The stirling engine which was invented by Rev Robert Stirling in 1816 is one of the efficient and practical machines. The engine has been commonly used in some very specialized applications, such as in submarines or auxiliary power generator for vehicles, where quiet operation is required. A γ -type stirling engine, one of the stirling engine consists of two cylinders, a piston and a displacer. In this study, a stirling engine which is based on the design and data of Moriya stirling engine(1938), was developed in laboratory scale. The geometry of the engine was scaled up with 1.5 times to the original one. All the parts were made by self-manufacturing, except raw material, axial bearing and fly wheel. From the partial test of the performance, rotational speed of axle was obtained to 270 rpm when the temperature of the heating and cooling zone was 120℃ , 50℃, respectively.