상업지역내 건물 사이 공간에 설치된 실외기 주변 열 환경 분석

신학종,곽인규,문선혜,허정호 한국태양에너지학회 2019 한국태양에너지학회 논문집 Vol.39 No.3

In commercial areas, outdoor units are typically installed close to one another in the narrow space between buildings due to insufficient regulations. This makes it difficult to ventilate the discharge airflow, which may lead to deterioration of the performance of outdoor units. This study conducted CFD simulation to analyze the thermal environment according to the installation distance of the outdoor unit. The outdoor unit was installed in the space between buildings, and the thermal environment was analyzed by changing installation distance and wind speed. The performance of the outdoor unit was evaluated by measuring the on-coil temperature. The results show that the closer the distance between outdoor units, the higher the condenser on-coil temperature. Also, the on-coil temperature appeared to rise dramatically at lower wind speed.

실외기 주변 기류패턴에 따른 초고층 공동주택에서의 냉방에너지소비 특성

김용식,최두성,최영범 청운대학교 건설환경연구소 2014 청운대학교 건설환경연구소 논문집 Vol.9 No.1

With the popularity of high-rise buildings, the vertical installation of air conditioner outdoor unitson the same line has caused an abnormal air current which interrupts their smooth arrangement andinflow of cool air. Therefore, this study attempted to analyze air conditioner performances (Coefficientof performance) of conventional outdoor units and those used in skyscrapers through CFD simulationand investigated effects caused by correlations between airflow patterns and outdoor wind direction. According to the analysis, the outdoor units which were directly contacted with outdoor air was greaterthan those with were indirectly touched with outdoor air by 2.66% in terms of air conditioner performances. When the suction and discharge surface of the outdoor units was turned to the side, air conditionerperformances were higher by 5.37%. Considering eight directions, in addition, air conditioner performancesimproved in all directions except for the outdoor air direction at 45° on the building surface when theoutdoor units were turned to the side. 초고층 건물이 증가함으로서 동일한 배열의 실외기를 수직으로 설치하여 실외기의 원활한 배열과 외기(cool air)의 도입을 방해하는 기류의 장애가 발생하는 문제가 부각되고 있다. 이에 본 연구는CFD(Computational Fluid Dynamics) 시뮬레이션을 통해 기존의 실외기와 초고층에서 사용되는 실외기의 에어컨 성능(Coefficient of performance) 분석 및 기류패턴과 외부풍향의 상관관계에 따른 영향을 분석하였다. 분석결과, 외기 직접 면한 실외기의 에어컨 성능이 외기 간접 면한 실외기의 에어컨 성능보다약 2.66% 높았고, 실외기의 흡입‧토출면 배치를 측면으로 틀었을 경우, 기존 실외기의 에어컨 성능보다5.37% 높은 것으로 분석되었다. 또한, 8개의 방위를 고려하였을 때, 건물면 45°에서의 외부풍향을 제외하고는 모든 풍향에서 측면으로 틀어진 실외기의 에어컨 성능이 높은 것으로 분석되었다.

화재예방을 위한 에어컨실외기의 자동개폐시스템

박재성,공하성 사단법인 인문사회과학기술융합학회 2019 예술인문사회융합멀티미디어논문지 Vol.9 No.6

This study is about an automatic opening and closing system for outdoor air conditioner units for discharging hot air to the outside while the air conditioner operates without any special operation by a user, in order to prevent a fire. This device not only prevents the failure of the outdoor unit but is also more convenient for the user. Included in the structure of the system are the following: a base frame fixed on the front wall of an outdoor air conditioner unit, in which a fan is installed; a sensor for sensing the operation of the fan by running the air conditioner; an opening and closing device connected to the rotating shaft of the louver to open and close the louver; and a controller for opening the louver by driving the opening and closing device when the operation of the air conditioner is detected by the sensing device. This device ultimately prevents the user from forgetting to open or close the opening and closing device, thereby preventing contamination of the air indoors, reducing the trouble of the compressor, and preventing the fire. 이 연구는 화재예방을 위해 사용자가 별도의 조작 없이도 에어컨의 작동과 동시에 실외기에서 발생되는 더운 공기를 외부로 배출시키는 에어컨실외기의 자동개폐장치에 관한 것이다. 이 장치는 실외기의 고장을 미연에 방지할 수 있을 뿐만 아니라 사용자의 편의성까지 향상시킬 수 있다. 구조는 팬이 내장되는 에어컨실외기의 전면 벽체에 고정 설치되는 베이스프레임, 에어컨의 구동에 의해 에어컨실외기의 팬 작동을 감지하는 감지장치, 베이스프레임의 내측 수평방향으로 결합된 여러 개의 회전축에 각각 결합되어 회전되는 루버, 루버의 회전축과 연결되어 루버의 개폐를 수행하는 개폐장치, 감지장치에 의해 에어컨의 작동이 감지되면 개폐장치를 구동시켜 루버를 개방하는 제어기로 되어있다. 이 연구에서 개발한 에어컨실외기의 자동개폐시스템은 궁극적으로 사용자가 실외기 전면에 설치한 개폐장치의 개폐를 잊어버리는 실수를 방지하여 실내공기의 오염을 막고, 컴프레서의 고장을 줄이며 화재를 예방할 수 있도록 하는 장치이다.

흡입 면적에 따른 에어컨 실외기의 온도 분포에 대한 수치적 연구

서광일(Kwang Il Seo),박성현(Seong Hyun Park),하만영(Man Yeong Ha) 대한기계학회 2016 대한기계학회 춘추학술대회 Vol.2016 No.12

The outdoor unit of air conditioner is mostly installed in a place of atmosphere to dissipate heat from the heat exchanger of outdoor unit. When a room temperature is increased due to an effect of discharged air flow from the outdoor unit, the performance of heat exchanger of outdoor unit is getting worse. The intake area, which means an area of breathing fresh air from an atmosphere is a performance metric for enhancing the performance of heat exchanger of air conditioner. Therefore, we consider the intake area in order to investigate the performance of heat exchanger. In this paper, the temperature distribution depended on the intake area of the outdoor unit was investigated numerically. For numerical analysis, commercial code ANSYS 14.5 was used for the flow solver. Cut-cell mesh method was used for the modeling of the outdoor unit, and Semi-Implicit Method for Pressure Linked Equation (SIMPLE) method was used for pressure and velocity coupling. The performance of outdoor unit was evaluated by averaged HX temperature.

시스템 에어컨 실외기 집단 설치 시 에어 가이드가 외부 열적 환경에 미치는 영향

허현(H. Hur),서영민(Y.M. Seo),정명근(M. Jeong),하만영(M.Y. Ha) 한국전산유체공학회 2017 한국전산유체공학회지 Vol.22 No.2

The numerical simulations were conducted on thermal environment with group installation of system air-conditioner outdoor unit. In this study, the effect of air-guide on the outdoor unit and consequent the performance improvement of outdoor unit were investigated. To validate the present numerical simulation, the temperature around outdoor units was measured on the real fields where the computational domain is considered in this study. For the numerical simulation, commercial code ANSYS 15.0 was used for the flow solver. Cut-cell mesh method was used for the modeling of the outdoor unit, and Semi-Implicit Method for Pressure Linked Equation(SIMPLE) method was used for pressure and velocity coupling. Detailed performances of outdoor unit were analyzed using the pathline of discharge flow generated from fans of outdoor unit, and the evaluation of performance in the outdoor unit.

공동주택 에어컨 실외기실의 토출 개구부 방충망과 실외기 간 이격 거리에 따른 냉동사이클에 관한 영향 연구

정기승(Ki-Seung Jung) 한국산업기술융합학회(구. 산업기술교육훈련학회) 2023 산업기술연구논문지 (JITR) Vol.28 No.1

에어컨 실외기 토출그릴 형상 최적화

최석호(Seok-Ho Choi),오세기(Sai-Kee Oh),김현종(Hyun-Jong Kim),진근호(Geun-Ho Jin),오시영(Si-Young Oh),김병순(Byung-Soon Kim) 대한설비공학회 2011 설비공학 논문집 Vol.23 No.11

The aerodynamic and aeroacoustic performance of discharge grille of outdoor unit of air-conditioner was investigated in this study. Discharge grille is one of outdoor unit’s important parts to affect the flow rate and Overall Sound Pressure Level(OSPL). New type of discharge grille was suggested based on the results of numerical simulation. To simulate the flow pattern near the propeller fan, commercial flow solver FLUENT was used. Sliding mesh method was used for rotating propeller fan and initial condition for unsteady model was calculated by Multiple Reference Frame(MRF) method. To minimize the interaction noise between fan blade wake and discharge grille, new discharge grille has radial rib which is aligned with trailing edge of fan blade. And inclined radial rib was adopted for reducing flow rate drop in discharge grille. The optimization of inclined angle of radial grille was performed experimentally.

에어컨 실외기 패널의 진동저감

백종희(Jong-Hui B),김원진(Won-Jin Kim) 한국소음진동공학회 2021 한국소음진동공학회 논문집 Vol.31 No.1

In this paper, a method for improving the hardness of the mount is proposed in order to reduce the vibration of the air conditioner outdoor unit panel. First, the vibration level of the first harmonic frequency was determined, which was found to be high, that is, 600 r/min and 760 r/min. Second, the vibration shape was analyzed via an operation deflection shape (ODS) analysis, and then, a mode analysis was performed using a finite element model to analyze the influence of the local vibration of the panel. It was found that the panel vibration originated from the rigid vibration of the outdoor unit. Finally, the effect of the model in terms of reduction in the vibration was confirmed by applying a mount with an improved hardness based on the impact response spectrum. Finally, the effectiveness of the improved mount design of the air conditioner outdoor panel in reducing the vibration was verified.

미스트 분무 실외기의 실내외조건 변화에 따른 에너지 절감 효과 검토

김민석(Kim, Min-seok),김혜미(Kim, Hyemi),송영학(Song, Young-hak) 대한건축학회 2017 대한건축학회 학술발표대회 논문집 Vol.37 No.1

구조 인텐서티법을 이용한 에어컨 실외기의 제진재 적용

김규식,진심원,정인화,이정우,강연준 한국소음진동공학회 2004 한국소음진동공학회 논문집 Vol.14 No.7

In this paper, reactive shearing structural intensity method is extended to damping patches placement on outer panels of outdoor unit of air-conditioner to reduce its structural borne noise. The structural intensity is calculated from the normal velocities of structures that are measured by using a laser scanning vibrometer, and $textsc{k}$-space (wave-number domain) signal processing is used to obtain the spatial derivatives in formulation of structural intensity. This method is applied to the outdoor unit of air-conditioner on shaker-exciting mode and operating mode. and then damping patches are placed over area of high reactive shearing structural intensity for reducing the radiated noise. Experimental results show the largest reduction of sound pressure level of an outdoor unit by appling small damping patches to optimal position.