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지열원 물대공기 멀티 히트펌프의 일일 난방 운전 특성에 관한 실증 연구
최종민(Jong Min Choi),임효재(Hyo-Jae Lim),강신형(Shin-Hyung Kang),문제명(Jemyung Moon),김록희(RockHee Kim) 대한설비공학회 2009 설비공학 논문집 Vol.21 No.9
The aim of this study is to investigate the daily heating performance of ground source multi-heat pump system with vertical single U-tube type GLHXs, which were installed in a school building located in Cheonan. Daily average COP of heat pump unit on Jan. 12th, 2009 at heating mode was lower than it on Nov. 10th, 2008 and Dec. 15th, 2008, because of lower EWT of the outdoor heat exchanger and relatively smaller size of condenser and evaporator. But, the system COP on the former was higher than it on the latter because ground loop circulating pump was operated in rated speed. It is suggested that the new algorithms to control the flow rate of secondary fluid for GLHX according to load change have to be developed in order to enhance the performance of the system COP.
지열원 멀티 히트펌프의 동절기 난방성능에 관한 실증 연구
최종민(Jong Min Choi),임효재(Hyo-Jae Lim),강신형(Shin-Hyung Kang),최재호(Jae Ho Choi),문제명(Jemyung Moon),권영석(Youngseok Kwon),권형진(HyungJin Kwon),김록희(RockHee Kim) 대한설비공학회 2009 대한설비공학회 학술발표대회논문집 Vol.2009 No.-
This paper describes the multi-heat pumps applied in an ground source heat pump system for an actual building. The performance of a ground source multi-heat pump installed in the field was investigated at heating season. The average COP of the systems with single U-tube and double tube type GLHXs were 4.8 and 5.0, respectively. It is needed to investigate the long term performance of double tube type GLHX, because the reduction of inlet temperature of OD HX for this GLHX was larger than it for U-tube GLHX.
지열원 시스템 히트펌프의 냉방 성능 특성에 관한 실증 연구
임효재(Hyo-Jae Lim),강신형(Shin-Hyung Kang),최재호(Jae Ho Choi),최종민(Jong Min Choi),문제명(Jemyung Moon),권영석(Youngseok Kwon),권형진(HyungJin Kwon),김록희(RockHee Kim) 대한설비공학회 2008 대한설비공학회 학술발표대회논문집 Vol.2008 No.2
Recently, small and medium-sized buildings have employed a multi-heat pump. The major benefits of the mulit-heat pump over a conventional system are that it is easier system to maintain along with a diversification of facility use, and high comfortability. The performance of multi-heat pump systems can be enhanced by using geothermal energy instead of air source energy. This paper describes the multi-heat pumps applied in an ground source heat pump system for an actual building. The performance of a ground source multi-heat pump installed in the field was investigated in cooling mode. The maximum COP of the systems with single U-tube and double tube ground loop heat exchangers were 6.6 and 6.0, respectively. It is suggested that the new algorithms to control the flow rate of secondary fluid for ground loop heat exchanger have to be developed in order to enhance the performance of the system.
지열원 물대공기 멀티 히트펌프의 냉방 운전 특성에 관한 실증 연구
최종민(Jong Min Choi),강신형(Shin-Hyung Kang),최재호(Jae Ho Choi),임효재(Hyo-Jae Lim),문제명(Jemyung Moon),권영석(Youngseok Kwon),권형진(HyungJin Kwon),김록희(RockHee Kim) 대한설비공학회 2009 설비공학 논문집 Vol.21 No.5
The aim of this study is to investigate the cooling performance of ground source multi-heat pump systems with a vertical single U-tube GLHX(U-tube system) and a vertical double tube GLHX(double tube system), which were installed in a school building located in Cheonan. All systems were operated in a part load conditions for all day, and the maximum COP of the single U-tube system and the double tube system were 6.2 and 5.2 at cooling mode, respectively. The double tube GLHX designed by the GLHEPRO, commercial program, was estimated to have the same performance as the Ur tube GLHX, because the inlet temperatures of each outdoor unit heat exchanger for the former was similar to the latter. Howerver, it is needed to prove the long term performance. It is suggested that the new algorithms to control the flow rate of secondary fluid for GLHX according to load variation have to be developed in order to enhance the performance of the system.