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首页> 外文学位 >A study of time-dependent responses of a mechanical displacement ventilation (DV) system and an underfloor air distribution (UFAD) system; Building energy performance of the UFAD system.
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A study of time-dependent responses of a mechanical displacement ventilation (DV) system and an underfloor air distribution (UFAD) system; Building energy performance of the UFAD system.

机译：研究机械置换通风（DV）系统和地板下空气分配（UFAD）系统的时间相关响应； UFAD系统的建筑节能性能。

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摘要

As alternative systems for saving cooling energy compared to conventional overhead (OH) air-conditioning systems, mechanical displacement ventilation (DV) systems and underfloor air distribution (UFAD) systems have been widely adopted for commercial buildings. In these alternative systems, supply air is discharged from low momentum diffusers located at lower positions close to the floor in the DV system, and the supply air of the UFAD system is distributed by an underfloor plenum and discharged from floor diffusers. To predict transient vertical temperature responses when the heat source or the ventilation flow rate vary in time, we introduce transient two-layer stratification models of the DV and UFAD systems, non-dimensionalize them by competing the filling box time (Baines & Turner 1969) and the replenishment time in which all the air in the enclosure is replaced by supply air and validate them by laboratory experiments using a salt-water analogy. In various scenarios of the heat source and the ventilation flow rate, the models show a good agreement with the laboratory experiments.;Building energy simulation, which predicts cooling and heating demands of a building, has been used for building design, environment, economics, and occupant comfort. EnergyPlus, which is a building energy simulation tools developed by the U.S. Department of Energy, has integrated capability to predict cooling and heating demands as well as the HVAC (heating, ventilation and air conditioning) energy consumption. To evaluate performance of energy savings of UFAD, we developed prototype office buildings adopting OH and UFAD, and the UCSD-UFAD model was used to estimate realistic cooling and heating demands by simulating the stratified temperature profile in a room. In Californian climates, annual electricity consumption of UFAD is always lower than that of OH by up to 20 %, since UFAD has more opportunities to utilize the economizer "free cooling" compared to OH. For electricity demand reduction of various Demand Response (DR) activities, increasing room set point temperature is the most effective DR activity and UFAD has higher peak demand reduction compared to OH by approximately 6-10 % when the room set point temperature is higher than 26 °C.
机译：与传统的顶置（OH）空调系统相比，作为节省冷却能量的替代系统，机械位移通风（DV）系统和地板空气分配（UFAD）系统已广泛用于商业建筑。在这些替代系统中，供应空气从位于DV系统中靠近地板的较低位置的低动量扩散器排出，而UFAD系统的供应空气由地板下气室分配并从地板扩散器排出。为了预测当热源或通风流量随时间变化时的瞬态垂直温度响应，我们引入了DV和UFAD系统的瞬态两层分层模型，通过竞争填充箱时间来对它们进行无量纲化（Baines＆Turner 1969）。以及补充时间，在该补充时间中，将外壳中的所有空气替换为供气，并使用盐水类比通过实验室实验对其进行验证。在热源和通风流量的各种情况下，这些模型与实验室实验显示出很好的一致性。；建筑能耗模拟可预测建筑物的制冷和供暖需求，已用于建筑设计，环境，经济，和乘员的舒适感。 EnergyPlus是美国能源部开发的一种建筑能耗模拟工具，具有预测制冷和供暖需求以及HVAC（供暖，通风和空调）能耗的集成功能。为了评估UFAD的节能性能，我们开发了采用OH和UFAD的办公楼原型，并使用UCSD-UFAD模型通过模拟房间中的分层温度曲线来估算实际的制冷和供暖需求。在加利福尼亚州的气候中，UFAD的年电力消耗始终比OH低20％，因为与OH相比，UFAD有更多的机会使用节能器“自然冷却”。对于减少各种需求响应（DR）活动的电力需求，提高房间设定点温度是最有效的DR活动，并且当房间设定点温度高于26时，UFAD的峰值需求减少量比OH大约高6％至10％。 ℃。

著录项

  • 作者

    Yu, Jong Keun.;

  • 作者单位

    University of California, San Diego.;

  • 授予单位 University of California, San Diego.;
  • 学科 Engineering Architectural.;Engineering Mechanical.
  • 学位 Ph.D.
  • 年度 2010
  • 页码 234 p.
  • 总页数 234
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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