• Proceedings of the Korea Society for Energy Engineering kosee Conference
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• 2004.05a
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• pp.335-339
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• 2004

• Geotechnical Engineering
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• v.20 no.10
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• pp.44-47
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• 2004

• The Magazine of the Society of Air-Conditioning and Refrigerating Engineers of Korea
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• v.31 no.10
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• pp.22-29
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• 2002

• 월간 기계설비
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• s.170
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• pp.15-19
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• 2004

• Journal of the Korean Institute of Educational Facilities
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• v.22 no.5
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• pp.18-23
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• 2015

• Proceedings of the SAREK Conference
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• 2009.06a
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• pp.579-585
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• 2009

Recently, Vertical-Closed Loop system using geothermal which is the most efficient among the building cooling and heating systems is coming into wide spread due to assistance of domestic policies. However, there is a limitation that a design of ground heat exchanger taking 60% of construction cost is done by GLD and GLHEPRO programs without specific guidelines and consideration on Entering Water Temperature(EWT). For getting an optimal EWT, we analyzed the costs for construction of ground heat exchanger and cooling and heating for 15 years. In the results, reduction of construction costs as the length of ground heat exchanger shortens was much greater than increase of the electrical power consumption as COP gets low. EWT that COP of heat pump can be 3.76 or above was below $31^{\circ}C$ in cooling and was over $5^{\circ}C$ in heating.

• KIEAE Journal
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• v.10 no.6
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• pp.139-144
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• 2010

The demands are increasing for the efficient heating and cooling system and thermal comfort environment because of changes in climate and environment, and deterioration of buildings and facilities can cause education budget to increase. So the study to apply heating and cooling system to university is urgently needed to improve an optimum energy saving system, educational environment and convenience of maintenance. For this reason, we selected a university campus in Seoul then came to understand the current situation and found some problems. We drew alternatives from comparative analysis of them. It selects representative building and carries out economic analysis to evaluate characteristics of energy consumption and economics on each type of heating and cooling system. As a result we drew the optimum system from those processes as previously stated. We studied 3 available systems, absorption chiller, EHP(Electric Heat Pump) and GHP(Gas Engine Heat Pump). According to LCC analysis suppose that the value of EHP is 1, it came out that the value of absorption chiller is 1.5 and the value of GHP is 2.2. This study, suggesting the optimum heating and cooling system, will support educational and research activities furthermore effect to maximize energy efficiency. Ultimately it is expected that it will contribute to make eco-friendly Green Campus.

• The Magazine for Energy Service Companies
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• s.32
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• pp.24-27
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• 2005

기후협약에 따른 환경과 에너지에 대한 국제적 규제의 강화는 지속가능한 에너지에 근거한 새로운 에너지전략의 수립을 요구하고 있다. 이러한 추세임을 감안할 때 ESCO를 통한 신$\cdot$재생에너지의 활용 가능성은 무궁무진해 보인다. 지열냉난방시스템은 1년 내내 $14\~16^{\circ}C$로 유지되는 땅속 온도를 에너지화하여 이용함으로써 에너지절약과 환경보호를 동시에 이룰 수 있는 무공해 청정시스템이다. 보험개발원 산하 자동차기술연구소는 지난 해 처음으로 지열시스템 도입 ESCO사업을 시행했다.

• Proceedings of the SAREK Conference
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• 2006.06a
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• pp.3-8
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• 2006

The heat pump system is attractive alternatives to conventional heating and cooling systems owing to their higher energy utilization efficiency. The thermal loads of commercial and institutional buildings are generally cooling-dominated. In this study have been developed ice storage type heat pump system for cooling and heating by heat pipe. This system was practiced performance test on evaluation criteria for heat storage systems. Accomplished the actual proof examination and looked into the performance of the system. In this study, measurement and analysis of ice storage type heat pump system for cooling and heating by heat pipe. The heat pump unit COP appears 3.05 for cooling and 4.20 for heating. As a result, the method to energy saving and to using a substitute energy actively that is heat pump cooling & heating system is expected by heat pipe. Thermal storage capacity appears $19.5RTH/m^3$ for cooling.

• The Magazine of the Society of Air-Conditioning and Refrigerating Engineers of Korea
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• v.18 no.6
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• pp.491-497
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• 1989