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지반 투수계수와 양수량 조건이 복수정 지열 히트펌프 시스템의 성능에 미치는 영향
조정흠(Jeong-Heum Cho),남유진(Yujin Nam) 한국지열·수열에너지학회 2015 한국지열에너지학회논문집 Vol.11 No.4
The groundwater heat pump (GWHP) systems have great potential for heating-cooling system which use annual constant groundwater temperature for heat source. Generally, the performance of GWHP system significantly depends on the geological and hydraulic properties such as hydraulic conductivity, thermal conductivity, soil condition so on. Therefore, in order to use GWHP systems efficiently, it is necessary to analyze the effect of design factors on the system performance. However, there are a few researches on the optimum design method for the open-loop geothermal system. In this research, the design factor in the open-loop geothermal system was analyzed quantitatively for the optimal design method by using numerical simulation. As a result, it was found that the temperature change of heat source depends on the design factor.
복수정을 이용한 개방형 지열 시스템의 초기투자비 회수기간 분석
조정흠(Jeong-Heum Cho),남유진(Yujin Nam) 대한설비공학회 2017 설비공학 논문집 Vol.29 No.3
Recently, ground source heat pump systems are being used in buildings for cooling and heating to reduce greenhouse gas and save energy. However, ground source heat pump systems mainly use the vertical closed-loop geothermal system design rather than the open-loop geothermal system design. This is due to a lack of knowledge and few research feasibility studies. In this research, a dynamic thermal analysis numerical simulation based on a standard house model was conducted for an open-loop geothermal system. Based on heating load analysis results, the life cycle costs of a standard house using an open two-well geothermal system were analyzed and compared with a vertical closed-loop geothermal system, and a diesel boiler. As a result, it was found that using an open two-well geothermal system shows economic return on investment after three years.
양정영(Jeong-yeong Yang),조정흠(Jung-heum Cho) 한국여행학회 2005 여행학연구 Vol.23 No.-
The purpose of this study is to analyze the university students and the salaried class behavior upon using coupons a reaction on coupon redemption in QSR(Quick-service Restaurants) and on the basis of this analysis, to give some information to QSR(Quick-service Restaurants) marketers who want to develop coupon system. A random sample of 320 university students and the salaried class participated in the study. Descriptive statistics, frequence analysis, crossing analysis and multiple regression by the SPSS/PC 13.0 statistical package are used for the empirical analysis. Results indicate that university students and the company salaried class preference of eating out restaurants is not distinguished by then-sex, age and group. And there is no difference between the preference coupon by sex and group but distinguished by age. Moreover, the following variables for coupons redemption behaviors influencing in QSR, turned out to influential correlation; the coupon proneness, value consciousness and the period of coupons redemption.