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지열원 멀티 열펌프 시스템의 시설원예 적용 일일 난방성능 특성 연구
최종민(Jong Min Choi),강신형(Shin-Hyung Kang),문제명(Jemyung Moon),권형진(Hyungjin Kwon) 대한설비공학회 2009 대한설비공학회 학술발표대회논문집 Vol.2009 No.-
Good plant-growth conditions can be achieved by means of using greenhouses. One of the main issues in greenhouse cultivation is energy savings through the development of high efficient heating and cooling system. GSHPs are one of the recommended systems to cope with this pending need. The aim of this study is to investigate the daily heating performance of ground source multi-heat pump system installed in a greenhouse. Daily average heating COP of the ground source multi-heat pump unit was very high by 8.2, because of relatively large condenser, evaporator, and mass flow rate through ground loop heat exchager. However, daily average heating system COP, overall heating coefficient of the performance of the system with heat pump unit and GLHX, decreased drastically due to relatively large power consumption of circulating pump under part load condition. It is suggested that the technology to enhance the performance of the ground source multi-heat pump system for a greenhouse under part load conditions should be developed.
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 열펌프 시스템의 시설원예 적용 난방성능 특성 실증 연구
강신형(Shin-Hyung Kang),최종민(Jong Min Choi),문제명(Jemyung Moon),권형진(Hyungjin Kwon) 대한설비공학회 2010 설비공학 논문집 Vol.22 No.6
Good plant-growth conditions can be achieved by means of using greenhouses. One of the main issues in greenhouse cultivation is energy savings through the development of high efficient heating and cooling system. GSHPs are one of the recommended systems to cope with this pending need. The aim of this study is to investigate the heating performance of ground source multi-heat pump system installed in a greenhouse under part load conditions. Daily average heating COP of the heat pump unit was very high by at least 7.4, because of relatively large condenser, evaporator, and mass flow rate through ground loop heat exchanger. However, the system COP, overall heating coefficient of the performance of the system with heat pump unit and GLHX, decreased drastically due to relatively large power consumption of circulating pump under part load condition. It is suggested that the technology to enhance the performance of the ground source multi-heat pump system for a greenhouse under part load conditions should be developed.
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.
동시냉난방 시스템 에어컨의 냉매량 변화에 따른 고낙차 장배관 운전 신뢰성 평가
이승찬(Seung-Chan Lee),김태안(Tae-An Kim),태상진(Sangjin Tae),정규하(Gyooha Jung),문제명(Jemyung Moon),김윤제(Youn-Jea Kim) 대한설비공학회 2008 대한설비공학회 학술발표대회논문집 Vol.2008 No.2
The heating and cooling performances of system multi-air conditioner for various refrigerant flow rates with high-head and long-line conditions are experimentally investigated. The maximum head and tube length were 110 m and 1000 m, and the two different adjustments of refrigerant flow rates were +20 % and -20 %, respectively. The experimental system was composed of 4 outdoor units with module systems, and 13 indoor units which were joined with the mode change unit by single-tube circuit. Field tests without indoor and outdoor temperature control were performed in a general office building with two different refrigerant flow rates. Especially, the oil level in the compressor was normally maintained at the safety zone. Experimental results were prepared on the p-h diagram.