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고인석(Insuk Ko),이주성(Jooseong Lee),박홍희(Honghee Park),김용찬(Yongchan Kim) 대한설비공학회 2012 대한설비공학회 학술발표대회논문집 Vol.2012 No.11
The objective of this paper is to compare the dynamic characteristics of a hybrid ground source heat pump (HGSHP) with a ground source heat pump (GSHP) under the ground thermal degradation condition (heat build-up) during long term operation. In order to simulate the ground heat build-up, a water bath with two tube type heat exchangers (one for a ground heat exchanger (GHEX) and the other for heat sink/source) was designed. The HGSHP system with the water bath was tested to identify the effect of the hybrid system by using a supplemental heat rejecter for decreasing the ground temperature over the GSHP system. The HGSHP showed higher system COP than the conventional GSHP system, and improved the ground thermal environment. From the test results, the HGSHP system allowed to improve performance over the GSHP system by using the supplemental equipment.
확산과 예혼합 연소의 결합을 통한 혼소 연소 및 배기 배출물에 관한 모델링
김규진(Gyujin Kim),이상열(Sangyul Lee),고인석(Insuk Ko),민경덕(Kyoungdoug Min) 한국자동차공학회 2013 한국자동차공학회 학술대회 및 전시회 Vol.2013 No.11
Dual-fuel combustion is a kind of concept which uses different type of fuels in a single engine cycle. By adding low reactivity fuel long before the injection of liquid fuel, we can use both advantages of each conventional combustion. However, the numerical approach to the dual-fuel combustion needs a huge amount of computational costs because there is no dual-fuel combustion models so they solve the chemical kinetics directly. So in this study, a unified model which combine diffusion flame model and premixed flame model was developed and applied to the practical 3-D engine mesh. It shows good agreement with experimental data and predicted levels of NOx, PM emissions showed reasonable agreement to the experimental data. Effect of injection timing and EGR rate in dual-fuel combustion are also investigated.