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首页> 外文会议>International Conference of Architecture and Technology >Comparison of Indoor Thermal Environment of an Office with Three Operational Modes of Chilled Panel and Displacement Ventilation System
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Comparison of Indoor Thermal Environment of an Office with Three Operational Modes of Chilled Panel and Displacement Ventilation System

机译：三种运行模式的办公室室内热环境比较和冷却面板和位移通风系统的运行方式

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Displacement ventilation (DV), chilled panel (CP) and their combination are all energy efficient air-conditioning modes. However, whether displacement ventilation and chilled panel operates individually or jointly can produce more comfortable environment and be more energy efficient is not very clear. Therefore, CFD simulations are conducted to reveal the difference between three modes: DV or CP operates individually, DV and CP jointly works.Indoor zero-equation turbulent model is adopted. Two sets of wall boundary conditions, adiabatic and isothermal conditions, axe specified to represent those of the transitional season and of hot summer season. Two joint operational modes are studied: (1) improving supply air temperature and chilled panel surface temperature, while keeping supply air velocity unchanged;(2) enhancing chilled panel surface temperature and lowering supply air velocity but keeping supply air temperature unchanged. Indoor temperature and velocity distributions are obtained for 8 cases.Results show that DV and CP system can be operated individually to meet the needs of thermal comfort in office room under adiabatic wall conditions. However, DV and CP jointly works, the vertical temperature gradient reduces. Indoor air velocity becomes weaker in combined work mode 2. Also the enhancing of the CP surface temperature offers the possibility of utilizing natural cooling source to chilled panel in transitional season.Results also indicate in hot summer conditions, if the cooling load of the room is high, DV system operated individually may lead to large vertical temperature gradient, exceeding 3°C/m in occupied zone. CP system work independently may not bring about obvious vertical temperature gradient, but condensation on the panel surface may occur if the indoor humidity increases. In comparison, displacement ventilation system operates with chilled panel may reduce vertical temperature gradient. And relatively lower indoor air velocity can be achieved by the combined mode 2, and the possibility of condensation also decreases.
机译：位移通风（DV），冷却面板（CP）及其组合都是节能空调模式。但是，位移通风和冷却面板是否单独或共同运行，可以产生更舒适的环境，更节能不是很清楚。因此，进行CFD模拟以揭示三种模式之间的差异：DV或CP单独操作，DV和CP共同工作。采用零方程湍流模型。两套墙边界条件，绝热和等温条件，斧头指定代表过渡季节和炎热的夏季。研究了两个联合操作模式：（1）改善供应空气温度和冷却面板表面温度，同时保持供应空气速度不变;（2）增强冷却面板表面温度并降低供应空气速度，但保持供应空气温度不变。为8例获得室内温度和速度分布。结果表明DV和CP系统可以单独操作，以满足在绝热墙条件下办公室室内热舒适性的需求。但是，DV和CP联合作品，垂直温度梯度减少。在组合工作模式中，室内空气速度变得较弱。此外，CP表面温度的增强还提供了在过渡季节中利用天然冷却源进入冷却面板的可能性。结果也表示在炎热的夏季条件下，如果房间的冷却负载是高，DV系统单独操作可能导致垂直温度梯度大，占用区域超过3°C / m。 CP系统独立工作可能不会带来明显的垂直温度梯度，但如果室内湿度增加，可能会发生面板表面的凝结。相比之下，位移通风系统用冷却面板操作，可以减少垂直温度梯度。通过组合模式2可以实现相对较低的室内空气速度，并且冷凝的可能性也降低。

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