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한도영(Doyoung Han),권형진(Hyungjin Kwon) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.11_1
The control algorithms for the electronic timer, which regulate the fuel injection timing of the Diesel engine fuel injection system, were developed by using the simplified effective dynamic models.<br/> The electronic timer assembly was modeled as the first order with time delay. The various parameters in the model were obtained from experimental data. This model was effectively used for the development of control algorithms of the fuel injection timing system.<br/> The displacement control algorithm and the rpm-disturbance control algorithm were used for the fuel injection timing control. These control algorithms result in the effective and practical control of the fuel injection timing.<br/>
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 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 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.
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.