자연환기와 냉방시스템을 병용한 하이브리드공조에 관한 연구

서정민(Jung-Min Seo),최영진(Young-Jin Choi),송두삼(Doo-Sam Song) 대한설비공학회 2006 대한설비공학회 학술발표대회논문집 Vol.2006 No.11

Hybrid AC system, coupled with cooling system and ventilation system with dehumidification and cooling mode in residential setting is investigated. In order to reduce the energy use for conventional cooling system, hybrid system coupled with natural ventilation seem to be promising. In this study, a concept of hybrid AC is described and the performance of the proposed systems is evaluated through physical experiment in terms of indoor environmental conditions for comfort and energy requirement under the favorable outdoor condition.

공동주택 발코니공간을 이용한 하이브리드 환기시스템의 성능평가

원종서,송의,김태연,이승복 대한건축학회 2007 대한건축학회논문집 Vol.23 No.5

The purpose of this paper was to evaluate the performance of hybrid ventilation system using the balcony space to solve the problem that mechanical ventilation systems have.The results of the simulation(TRNSYS and TRNFLOW) revealed that hybrid system was better than the constant mechanical system in indoor air quality and energy consumption. However, in mechanical ventilation mode, the two systems showed the similar in the concentration of pollutant. Also, hybrid ventilation method maintained the indoor thermal condition constantly during cooling and heating seasons.Regard to the energy consumption, the hybrid system could reduce 37% of heating, cooling and ventilation energy compared to constant airflow mechanical system.Therefore, the hybrid ventilation system using the balcony space in apartment housing would provide better comforts to the occupants and lower the energy consumption compared to the constant airflow ventilation system.

실내공기질을 고려한 공동주택의 하이브리드 환기시스템의 성능평가

이용준,이승복,이경회,원종서 대한건축학회 2005 대한건축학회논문집 Vol.21 No.9

The purpose of this paper was to evaluate the possible control modes of hybrid ventilation system in applying to general apartments. It evaluates range of hybrid ventilation control modes in terms of indoor air quality, thermal comfort, and energy consumption in 85.8㎡(net area) apartment. The TRNSYS simulation program was used for evaluating the following four ventilation types: 1) a ventilation mode relying on only infiltration for supplying air(S1), 2) a natural ventilation mode considering with weather condition(S2), 3) a hybrid ventilation<natural+mechanical ventilation> mode allowing minimum ventilation with no heat exchange(H1), 4) a hybrid ventilation mode with heat exchange(H2). This study shows the following results. As temperature being controlled by heating & cooling equipments, there is without significant difference in thermal performance among ventilation types. Regarding IAQ(Indoor Air Quality), Indoor air contamination level of the hybrid ventilation case consistently keep the lower levels. The hybrid ventilation modes consume more energy by a 49% as compared to the a ventilation mode relying on only infiltration for supplying air. It is caused by the continuous ventilation for keeping good indoor air quality; the increase of energy consumption can be attributable to the increase of the heating energy. Therefore, the heat exchange between indoor and outdoor air is required during heating season in severe weather conditions. During the cooling seasons, Introducing natural ventilation can achieve energy saving by 40~45%. Based on these results, a hybrid ventilation system can be suggested as an effective ventilation strategy for archiving high level of indoor air quality, thermal comfort, and energy consumption.

결로방지를 위한 공용배기 활용 환기 시스템의 습도저감 성능 분석

이수인(Suin Lee),최경석(Gyeong-Seok Choi),이용준(Yong Jun Lee),이현화(Hyun-Hwa Lee) 대한설비공학회 2021 설비공학 논문집 Vol.33 No.2

In order to prevent condensation, it is necessary to remove water vapor through ventilation. In this study, we proposed a hybrid ventilation system in which natural ventilation and cen-tralized exhaust fan (VCE) ventilation systems are linked, and then compared the air flow of the natural ventilation system and the VCE system using a Computational fluid dynamics (CFD) model. The possibility of condensation was analyzed according to the systems’ chang-es in temperature and relative humidity, and the temperature and the humidity of the ventila-tion systems were directly measured within apartment houses. The results revealed that the ventilation volume of the whole household measured at 0.15 ACH when the natural ventila-tion was applied, and 0.50 ACH when the VCE system was applied. The average indoor air temperature only decreased by 1℃ when VCE was applied, indicating a very slight differ-ence when compared to the natural ventilation system. In addition, the result of analyzing the relative humidity distribution shows that the local relative humidity exceeded 100%, and that condensation conditions were formed when the natural ventilation system was applied. How-ever, the relative humidity distribution was even, and less than 100%, when the VCE system was applied, indicating a low probability of condensation. The results of analyzing the dif-ferences in average indoor air temperature with the VCE system shows that the air tempera-ture was measured to be 1.9℃ lower in the living room, and 2.27℃ lower in the laundry room, the balcony, and the evacuation space, than the air temperatures achieved with the nat-ural ventilation system. As a result of measuring the levels of absolute humidity, the average absolute humidity with the shared exhaust ventilation system was lower by 44.56% in the liv-ing room, the laundry room, and the evacuation space, when compared to the humidity of the natural ventilation opening case. Therefore, the results revealed that the humidity reduction performance was improved when the shared exhaust ventilation system was applied, when compared to the natural ventilation system, which could be effective in the prevention of condensation.

창문형 하이브리드 환기시스템의 자연환기성능평가에 대한 연구

권오현(Kwon Oh-Hyun),진정탁(Jin Jeong-Tak),조홍재(Cho Hong-Jae),정재원(Jeong Jae-Weon) 대한건축학회 2011 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.31 No.2(계획계)

The efficiency of ventilation system is one of the most important issues of designing ventilation in buildings. The purpose of this study is to analyze the ventilation efficiency of hybrid ventilation system by experimental study using CO₂ gas method. According to the results of the study, It is shown that the mechanical ventilation efficiency in this room can be improved than natural ventilation efficiency.

냉난방과 환기를 통합 제어하는 하이브리드 공조시스템의 제안

서정민(Seo Jung-min),최영진(Choi Young-jin),김상진(Kim Sang-Jin),김주욱(Kim Joo-wook),송두삼(Song Doo-sam) 한국건축친환경설비학회 2007 한국건축친환경설비학회 학술발표대회 논문집 Vol.- No.-

In this study, a hybrid air-conditioning system using fan assisted natural ventilation and radiant floor cooling will be suggested. This system is based on the concept of utilizing both natural ventilation and radiant floor cooling. The concept of radiant floor cooling has been suggested by running chilled water through piping installed for heating system in Korean housing. In this paper, the concept of a hybrid air-conditioning system and the experiment result for evaluating the applicability of the proposed system in this study will be shown.

하이브리드 환기시스템을 이용한 실내 결로방지 제어

명제민(Jemin Myeong),신재성(Jaeseong Sin),최연희(Younhee Choi),신세영(Seiyoung Shin),송두삼(Doo-Sam Song) 대한설비공학회 2016 대한설비공학회 학술발표대회논문집 Vol.2016 No.6

The condensation problems at the window surface of the apartment building in winter have been repeatedly reported. The government established the regulation for preventing the condensation at the window, doors and corner of the wall in apartment buildings. However, the condensation problems are still reported because of the construction faults and lifestyle of the occupants. In this study, a control logic and system to prevent the contestation under occupied conditions in apartment buildings with hybrid ventilation system mounted at the window system is proposed. The performance of the proposed control system was analyzed by field measurement. The results showed that the operation of the ventilation system by 0.5ACH ventilation rates could not prevent the condensation. At most, 1.2ACH ventilation rates should be needed to prevent the condensation when the indoor temperature and humidity is controlled at 25℃, 50% RH, respectively.

자연환기와 냉난방시스템을 병용한 하이브리드공조의 제어개념

김상진(Kim Sang-Jin),서정민(Seo Jung-Min),최영진(Choi Young-Jin),송두삼(Song Doo-Sam),김태연(Kim Tae-Yeon),이승복(Leigh Seung-Bok) 대한건축학회 2007 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.27 No.1

Hybrid AC system, coupled with heating, cooling system and natural ventilation system with dehumidification and cooling mode in residential setting is investigated. In order to reduce the energy use for conventional cooling system, hybrid system coupled with natural ventilation seem to be promising. In this study, a optimal control of hybrid AC is explained and the performance of the proposed systems is evaluated through simulation program Trnsys in terms of indoor environmental conditions for comfort and energy requirement under the favorable outdoor condition.

하계 공동주택 하이브리드 환기시스템 적용에 따른 실내공기 및 열 환경 평가

김상진(Sang-Jin Kim),김은수(Eun-Soo Kim),김태연(Taeyeon Kim),이승복(Seung Bok Leigh) 대한설비공학회 2006 대한설비공학회 학술발표대회논문집 Vol.2006 No.6

The recent on indoor air problem has led to many studies on the methods and effects of ventilation for better indoor air quality. Although natural ventilation is the most effective and energy-saving method in residental housings, the small size of openable window has been a problem in high-rise residential buildings to ventilate only through natural ventilation. Consequently, the installation of mechanical ventilation system has been a requirement in residential buildings, and has caused other problems such as increase of energy consumption and SBS. Hybrid ventilation which uses forces of both natural and mechanical power has been introduced to solve the problem of increase in energy consumption with natural ventilation. In this paper, two types of hybrid ventilation systems in residential building were introduced. One type was with natural ventilation through vent grille in the window, and another type was with natural ventilation through ceiling duct while both types used mechanical ventilation system with the outlets. The indoor temperature distribution and pollution density distribution in summer while operating the ceiling air conditioner were analyzed through CFD simulation. In this paper, the optimal location of diffusers to achieve thermal comfort would be proposed.

복사냉방과 자연환기를 병용한 하이브리드시스템의 고온다습 기후에의 적용 가능성 분석

송두삼,이승복 대한건축학회 2005 대한건축학회논문집 Vol.21 No.11

Differing from an existing hybrid system, the hybrid cooling system suggested by this study introduces outdoor air with natural ventilation even when the outdoor air is unfavorable to cool the indoor environment. For this purpose, the system is devised on a strategy that utilizes stratified room air with a vertical temperature gradient. The air cooled by the radiation panel settles down within the lower part of the room, while the hot and humid outdoor air introducing through ventilation inlet passes through the upper region of the room and sweeps out the heat and contaminants generated in the room. The characteristics of the indoor environment are examined using CFD (Computational Fluid Dynamics) simulation, which is coupled with radiation heat transfer simulation and with HVAC control. In this paper, the performance of hybrid cooling system coupled with radiation panel cooling and natural ventilation is analyzed under hot and humid climate. The relations between the characteristics of thermal stratification of the room and system design parameters (ceiling height, cooling panel height and ventilation opening height) are analyzed. Even in severe outdoor condition, the hybrid cooling system with radiation panel cooling system is more energy-efficient than an underfloor air cooling system when introducing wind-driven cross ventilation.