Baek, S. K. (2004). Study on ground-coupled heat pump system using hollow piles, Ph.D. Thesis, Busan University, Korea (in Korean).Baek, S. K. (2004). Study on ground-coupled heat pump system using hollow piles, Ph.D. Thesis, Busan University, Korea (in Korean).

Bourne-Webb, P. J., Amatya, B., Soga, K., Amis, T., Davidson, C. and Payne, P. (2009). “Energy pile test at Lambeth College, London: Geotechnical and Thermodynamic Aspects of Pile Response to Heat Cycles.” Geotechniques, Vol. 59, No. 3, pp. 237-248.Bourne-Webb, P. J., Amatya, B., Soga, K., Amis, T., Davidson, C. and Payne, P. (2009). “Energy pile test at Lambeth College, London: Geotechnical and Thermodynamic Aspects of Pile Response to Heat Cycles.” Geotechniques, Vol. 59, No. 3, pp. 237-248.

Choi, J. C. and Lee, S. R. (2010). “Numerical simulation of ground heat exchanger embedded pile considering unsaturated soil condition.” Proceedings of 2010 KGS Spring Conference, Korean Geotechnical Society (KGS), pp. 213-220 (in Korean).Choi, J. C. and Lee, S. R. (2010). “Numerical simulation of ground heat exchanger embedded pile considering unsaturated soil condition.” Proceedings of 2010 KGS Spring Conference, Korean Geotechnical Society (KGS), pp. 213-220 (in Korean).

Cui, P., Li, X., Man, Y. and Fang, Z. (2011). “Heat transfer analysis of pile geothermal heat exchangers with spiral coils.” Applied Energy, Vol. 88, pp. 4113-4119.Cui, P., Li, X., Man, Y. and Fang, Z. (2011). “Heat transfer analysis of pile geothermal heat exchangers with spiral coils.” Applied Energy, Vol. 88, pp. 4113-4119.

Engineeringtoolbox.com (2005). http://www.engineeringtoolbox.comEngineeringtoolbox.com (2005). http://www.engineeringtoolbox.com

Gao, J., Zhang, X., Liu, J., Li, K. and Yang, J. (2008a). “Numerical and experimental assessment of thermal performance of vertical energy piles.” Applied Energy, Vol. 85, pp. 901-910.Gao, J., Zhang, X., Liu, J., Li, K. and Yang, J. (2008a). “Numerical and experimental assessment of thermal performance of vertical energy piles.” Applied Energy, Vol. 85, pp. 901-910.

Gao, J., Zhang, X., Liu, J., Li, K. and Yang, J. (2008b). “Thermal performance and ground temperature of vertical pile-foundation heat exchangers: A case study.” Applied Thermal Engineering, Vol. 28, pp. 2295-2304.Gao, J., Zhang, X., Liu, J., Li, K. and Yang, J. (2008b). “Thermal performance and ground temperature of vertical pile-foundation heat exchangers: A case study.” Applied Thermal Engineering, Vol. 28, pp. 2295-2304.

Hamada, Y., Saitoh, H., Nakamura, M., Kubota, H., and Ochifuji, K. (2007). “Field performance of an energy pile system for space heating.” Energy and Building, Vol. 39, pp. 517-524.Hamada, Y., Saitoh, H., Nakamura, M., Kubota, H., and Ochifuji, K. (2007). “Field performance of an energy pile system for space heating.” Energy and Building, Vol. 39, pp. 517-524.

Jeong, S., Song, J., Min, H. and Lee, S. (2010). “Thermal influence factors of energy pile.” Journal of the Korean Society of Civil Engineers (KSCE), Vol. 30, No. 6C, pp. 231-239 (in Korean).Jeong, S., Song, J., Min, H. and Lee, S. (2010). “Thermal influence factors of energy pile.” Journal of the Korean Society of Civil Engineers (KSCE), Vol. 30, No. 6C, pp. 231-239 (in Korean).

Jun, L., Zhang, X., Gao, J. and Yang J. (2009). “Evaluation of heat exchange rate of GHE in geothermal heat pump system.” Renewable Energy, Vol. 34, pp. 2898-2904.Jun, L., Zhang, X., Gao, J. and Yang J. (2009). “Evaluation of heat exchange rate of GHE in geothermal heat pump system.” Renewable Energy, Vol. 34, pp. 2898-2904.

Knellwolf, C., Peron, H. and Laloui, L. (2011). “Geotechnical analysis of heat exchanger piles.” Journal of Geotechnical and Geoenvironmental Engineering, ASCE, Vol. 137, No. 10, pp. 890-902.Knellwolf, C., Peron, H. and Laloui, L. (2011). “Geotechnical analysis of heat exchanger piles.” Journal of Geotechnical and Geoenvironmental Engineering, ASCE, Vol. 137, No. 10, pp. 890-902.

Laloui, L., Moreni, M. and Vulliet, L. (2003). “Behavior of a dual- purpose pile as foundation and heat exchanger.” Canadian Geotechnical Journal, Vol. 40, No. 2, pp. 388-402.Laloui, L., Moreni, M. and Vulliet, L. (2003). “Behavior of a dual- purpose pile as foundation and heat exchanger.” Canadian Geotechnical Journal, Vol. 40, No. 2, pp. 388-402.

Laloui, L., Nuth M. and Vulliet L. (2006). “Experimental and numerical investigations of the behavior of a heat exchanger pile.” International Journal for Numerical and Analytical Methods in Geomechanics, Vol. 30, pp. 763-781.Laloui, L., Nuth M. and Vulliet L. (2006). “Experimental and numerical investigations of the behavior of a heat exchanger pile.” International Journal for Numerical and Analytical Methods in Geomechanics, Vol. 30, pp. 763-781.

Lee, C., Min, S., Koh, H., Yoo, J., Jung, K. and Choi, H. (2011). “Thermal performance of cast-in-place concrete energy pile.” Proceedings of the 2011 World Congress on Advances in Structural Engineering and Mechanics (ASEM’11), Seoul, Korea, pp. 3747-3758.Lee, C., Min, S., Koh, H., Yoo, J., Jung, K. and Choi, H. (2011). “Thermal performance of cast-in-place concrete energy pile.” Proceedings of the 2011 World Congress on Advances in Structural Engineering and Mechanics (ASEM’11), Seoul, Korea, pp. 3747-3758.

Lee, S., Park, H., Park, D. and Yoon, S. (2012). “Numerical simulation of seasonal performance of energy pile.” Proceedings of the 2012 World Congress on Advances in Civil, Environmental, and Materials Research (ACEM’12), Seoul, Korea, pp. 2459-2465.Lee, S., Park, H., Park, D. and Yoon, S. (2012). “Numerical simulation of seasonal performance of energy pile.” Proceedings of the 2012 World Congress on Advances in Civil, Environmental, and Materials Research (ACEM’12), Seoul, Korea, pp. 2459-2465.

Li, X., Chen, Y., Chen, Z. and Zhao, J. (2006). “Thermal performances of different types of underground heat exchangers.” Energy and Building, Vol. 38, pp. 543-547.Li, X., Chen, Y., Chen, Z. and Zhao, J. (2006). “Thermal performances of different types of underground heat exchangers.” Energy and Building, Vol. 38, pp. 543-547.

Lim, H., Jeong, S., Ko, J. and Jeong, C. (2012). “The comparison of the temperature output on energy piles between field measurement and numerical analysis.” Proceedings of 2012 KGS Fall Conference, Korean Geotechnical Society (KGS), pp. 966-972 (in Korean).Lim, H., Jeong, S., Ko, J. and Jeong, C. (2012). “The comparison of the temperature output on energy piles between field measurement and numerical analysis.” Proceedings of 2012 KGS Fall Conference, Korean Geotechnical Society (KGS), pp. 966-972 (in Korean).

Man, L., Yang, H., Diao, N., Liu, J. and Fang, J. (2010). “A new model and analytical solutions for borehole and pile ground heat exchangers.” International Journal of Heat and Mass Transfer, Vol. 53, pp. 2593-2061.Man, L., Yang, H., Diao, N., Liu, J. and Fang, J. (2010). “A new model and analytical solutions for borehole and pile ground heat exchangers.” International Journal of Heat and Mass Transfer, Vol. 53, pp. 2593-2061.

Min, H. and Jeong, S. (2012). “Analysis of thermal efficiency on energy piles considering thermal influence factors.” Proceedings of 2012 KGS Spring Conference, Korean Geotechnical Society (KGS), pp. 1505-1512 (in Korean).Min, H. and Jeong, S. (2012). “Analysis of thermal efficiency on energy piles considering thermal influence factors.” Proceedings of 2012 KGS Spring Conference, Korean Geotechnical Society (KGS), pp. 1505-1512 (in Korean).

Ministry of knowledge Economy (2012). Standard and guide supporting for new and renewable energy systems, Korea Energy Management Corporation (in Korean).Ministry of knowledge Economy (2012). Standard and guide supporting for new and renewable energy systems, Korea Energy Management Corporation (in Korean).

Morino, K. and Oka, T. (1994). “Study on heat exchanged in soil by circulating water in a steel pile.” Energy and Building, Vol. 21, pp. 65-78.Morino, K. and Oka, T. (1994). “Study on heat exchanged in soil by circulating water in a steel pile.” Energy and Building, Vol. 21, pp. 65-78.

Nam, Y., Ooka, R. and Hwang, S. (2008). “Development of a numerical model to predict heat exchang rates for a ground source heat pump system.” Energy and Building, Vol. 40, pp. 2113-2140.Nam, Y., Ooka, R. and Hwang, S. (2008). “Development of a numerical model to predict heat exchang rates for a ground source heat pump system.” Energy and Building, Vol. 40, pp. 2113-2140.

Nam, Y. and Ooka, R. (2011). “Development of potential map for ground and groundwater heat pump systems and the application to tokyo.” Energy and Building, Vol. 43, pp. 677-685.Nam, Y. and Ooka, R. (2011). “Development of potential map for ground and groundwater heat pump systems and the application to tokyo.” Energy and Building, Vol. 43, pp. 677-685.

Pahud, D. and Hubbuck, M. (2007). “Measured thermal performances of the energy pile system of the dock midfield at Zürich Airport.” Proceedings of European Geothermal Congress 2007, Unterhaching, Germany, pp. 1-7.Pahud, D. and Hubbuck, M. (2007). “Measured thermal performances of the energy pile system of the dock midfield at Zürich Airport.” Proceedings of European Geothermal Congress 2007, Unterhaching, Germany, pp. 1-7.

Park, S., Lee, C., Park, Y-B, Sohn, J-R and Choi, H. (2012). “Research on heat exchange characteristics of coil-type PHC energy pile.” Proceedings of 2012 KGS Spring Conference, Korean Geotechnical Society (KGS), pp. 201-212 (in Korean).Park, S., Lee, C., Park, Y-B, Sohn, J-R and Choi, H. (2012). “Research on heat exchange characteristics of coil-type PHC energy pile.” Proceedings of 2012 KGS Spring Conference, Korean Geotechnical Society (KGS), pp. 201-212 (in Korean).

Park, S., Park, Y-B, Sim, Y-J, Lee, C. and Choi, H. (2012). “Study on heat exchange characteristics for PHC Energy piles.” Proceedings of the 2012 World Congress on Advances in Civil, Environmental, and Materials Research (ACEM’12), Seoul, Korea, pp. 2493-2507.Park, S., Park, Y-B, Sim, Y-J, Lee, C. and Choi, H. (2012). “Study on heat exchange characteristics for PHC Energy piles.” Proceedings of the 2012 World Congress on Advances in Civil, Environmental, and Materials Research (ACEM’12), Seoul, Korea, pp. 2493-2507.

Ryu, H-K. (2008). “Development and performance evaluation of ground heat exchanger utilizing PHC pile foundation of building.” Journal of Korean Solar Energy Society, Vol. 28, No. 5, pp. 56-64 (in Korean).Ryu, H-K. (2008). “Development and performance evaluation of ground heat exchanger utilizing PHC pile foundation of building.” Journal of Korean Solar Energy Society, Vol. 28, No. 5, pp. 56-64 (in Korean).

Ryu, H-K, Lee, B-S, Park, S., Lee, C. and Choi, H. (2012). “Study on the design and construction optimize of coil-type PHC enery pile.” Proceedings of 2012 SAREK Summer Conference, The Society of Air-conditioning and Refrigerating Engineers of Korea (SAREK), pp. 402-406 (in Korean).Ryu, H-K, Lee, B-S, Park, S., Lee, C. and Choi, H. (2012). “Study on the design and construction optimize of coil-type PHC enery pile.” Proceedings of 2012 SAREK Summer Conference, The Society of Air-conditioning and Refrigerating Engineers of Korea (SAREK), pp. 402-406 (in Korean).

Wood, C. J., Liu, H. and Riffat, S. B. (2009). “Use of energy piles in a residential building, and effects on ground temperature and heat pump efficiency.” Geotechniques, Vol. 59, No. 3, pp. 287-290.Wood, C. J., Liu, H. and Riffat, S. B. (2009). “Use of energy piles in a residential building, and effects on ground temperature and heat pump efficiency.” Geotechniques, Vol. 59, No. 3, pp. 287-290.