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자연환기병용형 하이브리드 공조시에 유입외기의 온도변화가 실내환경에 미치는 영향
장현재,가등신개 대한건축학회 2001 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.21 No.2
The characteristics of a hybrid air-conditioning system, utilizing natural and mechanical ventilation, is investigated in an office setting. The application of this hybrid air-conditioning system in intermediate seasons of Spring and Autumn, is expected to improve the indoor air quality (IAQ) on the one hand, and lower the energy consumption on the other. For designing datum of hybrid air-conditioning system, the characteristics of the indoor environment are examined with CFD(Computational Fluid Dynamics) simulation under various conditions of incoming outdoor air temperature for natural cross ventilation. Cooling load of the mechanical air-conditioning system to maintain the task zone at the target temperature (26℃) is analyzed based on the results of these simulations. When the outdoor air of lower temperature than the indoor air flows into the room, it drops near the window opening because of the negative buoyancy effect in the room and cools the task zone energy efficiently.
自然換氣倂用型하이브리드 空調時에 流入外氣의 溫?濕度와 流入風量의 變化가 室內環境에 미치는 影響
장현재,加藤信介 대한건축학회 2002 대한건축학회논문집 Vol.18 No.6
The performance of a hybrid air-conditioning system which utilizes wind-induced cross ventilation is investigated in the office setting. The characteristics of flow, temperature fields, humidity fields and age of air are examined using CFD simulation under various conditions of in-flowing outdoor air, i.e.,change in air temperature, humidity and variable air exchange rate. The room air controlling system (VAV system) which is used to keep the task zone at a target temperature in this simulation, is reproduced through changing the supply airflow rate of the air-conditioning system. With that, we can estimate how much cooling heat is required by the air-conditioning system to keep the task zone at the target temperature, and can analyze the details of the flow and the temperature fields in their respective conditions. When the outdoor air flows into the room sinks to close to the ground, it does not mix with the air in the room, and thus can cools the task zone well. The cooling load of the mechanical AC system is shown to increase with both the increases of the outdoor air temperature, and with the decreases of the in-flowing outdoor air volume.
對流, 輻射, 濕氣輸送과 空調시스템 制御의 連成解析에 관한 硏究 ― PMV 一定條件에서의 室內空調負荷解析과 應用―
金泰延,加藤信介,村上周三 대한건축학회 2002 대한건축학회논문집 Vol.18 No.8
A CFD (Computational Fluid Dynamics) simulation for analyzing indoor cooling/heating load is presented in this study. It is coupled with a radiative heat transfer simulation and HVAC (Heating, Ventilating, and Air-Conditioning) control system in a room. This new method feeds back the outputs of the HVAC system control to the input boundary conditions of the CFD, and this method includes a human model to evaluate the thermal environment. It would be used to analyze the heating/cooling loads of different HVAC systems under the condition of the same human thermal sensation (e.g. PMV, Operative Temperature, etc.) even though the temperature and air-velocity distribution in the room are different from each other.To examine the performance of the new method, a cooling load and a thermal environment within a semi-enclosed space, which opens into an atrium space, is analyzed under the steady-state conditions during the summer season. This method is able to analyze the indoor cooling load with changes of target thermal environments of a room considering the temperature and the air-velocity distribution in the room. In this paper, two types of HVAC system are compared; i.e. radiation-panel system and all-air cooling system. The radiation-panel cooling system is found to be more energy-efficient for cooling the semi-enclosed space. Changes of the level of thermal environment reduce cooling load effectively in case of the all-air cooling system while the radiation-panel system does not reduce cooling load even though the targeted thermal condition is relaxed.