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류형규,최승혁,윤희원,김유승,Ryu, Hyung-Kyou,Choi, Seung-Hyuck,Yun, Hi-won,Gim, Yu-Seung 한국지열에너지학회 2017 한국지열에너지학회논문집 Vol.13 No.2
When applying geothermal systems in cities such as seoul where high density development prevails, the selection of geothermal system capable of obtaining a large capacity in the limited grounds is necessary. In this study, an easy-to-use design tool is developed in the form of spreadsheet by applying the calculation theory of existing closed-loop vertical ground heat exchanger that can be used in the early design stage of the open-loop ground heat exchanger. By only using the maximum cooling and heating load, it is possible to calculate optimal design open-loop ground heat exchanger. Further research is needed, we are plan to improve the program considering the heat loss of groundwater flowing in the inner casing, G-Function for Open-Loop, and verification by applying actual projects.
류형규(Hyung-Kyou Ryu),이병석(Byung-Seok Lee),김양섭(Yang-Sub Kim) 대한설비공학회 2012 대한설비공학회 학술발표대회논문집 Vol.2012 No.6
In this study, we choose an apartment house that has a ventilation system contained with CO2 sensors. The ventilation system runs on above 1,000 ppm of CO2 in indoor air. The control performance and electrical energy usage of CO2 sensor contained ventilation system has been monitored for one month and also analyzed. As a result, the average CO2 concentration in nursery room is 782 ppm, at ventilated home as 1,563 ppm at non-ventilated home. And electricity consumption by ventilation was 13.3 kWh. This study can be utilized as a basis for extension of CO2 sensor contained ventilation system application and encouraged for the use of conventional ventilation systems.
류형규(Hyung Kyou Ryu),윤희원(Hiwon Yun),최승혁(Seung Hyuck Choi),유호선(Hoseon Yoo) 대한설비공학회 2021 대한설비공학회 학술발표대회논문집 Vol.2021 No.6
기계설비 유지관리는 건축물의 수명연장 및 에너지 절감을 위하여 꼭 필요한 사항임에도 불구하고 개별 건축물별로 자율 또는 특정 법률에 의해 부분적으로 관리가 이루어져왔다. 이로 인해 건축물에서 사용하는 에너지의 71%를 사용하는 기계설비에 대한 관리는 매우 소홀한 실정이다. 본 연구에서는 기계설비법 제16조와 같은 법 규칙 제7조에 근거하여 기계설비의 안전하고 효율적인 유지관리와 유지관리의 주요 주체인 관리주체, 유지관리자, 성능점검 업자의 업무와 역할을 명확하게 구분할 수 있도록 유지관리기준(안)을 마련하였다.
4차 다항함수를 이용한 건물의 연간부하 예측 방법에 관한 연구
류형규(Hyung-Kyou Ryu),윤희원(Hi-Won Yun),이영준(Young-June Lee) 대한설비공학회 2015 대한설비공학회 학술발표대회논문집 Vol.2015 No.11
In order to use and manage the building energy efficiently, it is necessary to minimize building energy consumptions, and establish operation plans of various equipment. The maximum heating and cooling load calculation is an essential way in various equipment selections, and the annual building load calculation is used in forecasting & evaluating the LCC required for operation plan. In this study, noting that the annual building load changes depending on outside temperature around year, we propose a predicting method of annual building load. By using the 4<SUP>th</SUP> polynomial function that have two double radix and a feature the f(x)=a⁴ in x=0 condition, we can calculate annual building load very easily only with the two result(maximum heating and cooling load) and a minimum parameters.
코일형 PHC 에너지 파일의 최적 설계 및 시공에 관한 연구
류형규(Hyung-Kyou Ryu),이병석(Byung-Seok Lee),박상우(Sang-Woo Park),이철호(Cul-Ho Lee),최항석(Hang-Seok Choi) 대한설비공학회 2012 대한설비공학회 학술발표대회논문집 Vol.2012 No.6
An energy pile encases heat exchange pipes to exchange heat energy with the surrounding ground formation by circulating working fluid through the pipes. In this paper, a coil.type PHC energy pile was constructed in a test bed and its thermal performance was experimentally and numerically evaluated to make a preliminary design. An in-situ thermal response test(TRT) was performed in the coil-type PHC energy pile and its results were compared with the solid cylinder source model. In addition, a CFD numerical model using FLUNET was carried out to back-analyze the thermal conductivity of the ground formation from the TRT result. Finally, by using this CFD numerical model, the optimal length(pitch) of the coil pipe is calculated for efficient PHC energy pile design and construction.
류형규(Hyung-Kyou Ryu),정민호(Min-Ho chung),이병석(Byung-seok Lee),최현준(Hyun-Jun Choi),최항석(Hang-Seok Choi) 한국지열·수열에너지학회 2014 한국지열에너지학회논문집 Vol.10 No.2
This paper proposes an optimum pipe material (PVC vs. PE) design & selection for open loop ground heat exchangers. Heat exchange efficiency and/or workability, and the need for trench insulation were investigated by comparing EWT (cooling mode) of each system. CFD simulations for the PVC and PE pipe with the same inner diameter show similar EWT. This is because the PVC pipe has a small thickness but a low thermal conductivity as compared to the PE pipe, and thus these two properties tend to offset each other. However, a hypothetically insulated pipe led to a meaningful drop of EWT. This means pipe insulation is of importance in performance of ground heat exchangers. From analyzing climate data and system operation, it is not advantageous to insulate trench pipes due to construction difficulties and ground temperature characteristics that are seasonally varied.
건물부하 및 지중특성을 고려한 개방형 지중열교환기 개발 방향
류형규(Hyung-Kyou Ryu),윤희원(Hi-Won Yun),최승혁(Seung-Hyuck Choi) 대한설비공학회 2016 대한설비공학회 학술발표대회논문집 Vol.2016 No.6
The purpose of this study is to present an approach for developing guideline of open type ground heat exchanger considering the geotechnical properties and heating and cooling loads of buildings. The results indicate that typical building loads are often greater in cooling season. Therefore, it is necessary to develop open type ground heat exchanger having the upward flow as upward flow exchanger is efficient in cooling mode. In addition, it is necessary to increase the effective length of ground heat exchanger in the existing technology. Based on this study, it is possible to develop a more efficient geothermal system.
바닥난방 구조에 따른 바닥충격음 및 보행감 평가에 관한 연구
류형규(Hyung Kyou Ryu),최승혁(Seung Hyuck Choi),구본수(Bon Soo Koo),정민호(Min Ho Chung) 대한설비공학회 2019 대한설비공학회 학술발표대회논문집 Vol.2019 No.11
In this study, floor impact sound and feeling of walk were evaluated according to floor heating structure. As a result of the floor impact test, the light-weight impact sound was found to be A Room(level 1), B Room and C (level 3), and D Room(level 2). All heavy-weight impact sounds were rated out of grade. In particular, the dry method of Room D was evaluated as second-class with a 1 ㏈ difference compared to A Room, so that the dry method was advantageous in reducing the light impact sound, but was disadvantageous in the weight impact sound. In the feeling of walk evaluation, the dry type was measured at 26.6 ㎝/s2 (0.5 m from the impact source), which corresponds to strong(vibration level 4). In the walking experience experiment, B Room(4.4 points), A Room (4.0 points), C Room (3.8 points), and D Room(3.4 points) showed that D Room applied with the dry method was unfavorable due to vibration.