Ventilation effectiveness measures based on heat removal: Part 1. Definitions

C.J. Coffey; G.R. Hunt

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Ventilation effectiveness measures based on heat removal: Part 1. Definitions

机译：基于除热的通风效率措施：第1部分。定义

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The effectiveness of ventilation flows is considered from the perspective of buoyancy (or heat) removal from a space. This perspective is distinct from the standard in which the effectiveness is based on the concentrations of a neutrally buoyant contaminant/passive tracer. Three new measures of effectiveness are proposed based on the ability of a flow to flush buoyancy from a ventilated space. These measures provide estimates of instantaneous and time-averaged effectiveness for the entire space, and local effectiveness at any height of interest. From a generalisation of the latter, a vertical profile of effectiveness is defined. These measures enable quantitative comparisons to be made between different flows and they are applicable when there is a difference in density (as is typical due to temperature differences) between the interior environment and the replacement air. Applications, therefore, include natural ventilation, hybrid ventilation and a range of forced ventilation flows. Finally, we demonstrate how the ventilation effectiveness of a room may be assessed from simple traces of temperature versus time.

机译：从空间的浮力（或热量）去除的角度考虑了通风流的有效性。这种观点不同于标准，在该标准中，有效性基于中性浮力污染物/被动示踪剂的浓度。根据流量从通风空间冲洗浮力的能力，提出了三种新的有效性度量。这些度量提供了整个空间的瞬时和时间平均有效性的估计值，以及在任何关注高度的局部有效性的估计值。通过对后者的概括，可以定义有效性的垂直分布。这些措施使得可以对不同流量进行定量比较，并且当内部环境和替代空气之间存在密度差异（由于温度差异而导致的差异）时，这些措施也适用。因此，应用包括自然通风，混合通风和一系列强制通风。最后，我们演示了如何从简单的温度随时间变化的轨迹评估房间的通风效果。

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来源
《Building and Environment》 |2007年第6期|p.2241-2248|共8页
作者
C.J. Coffey; G.R. Hunt;
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作者单位

Department of Civil and Environmental Engineering, Imperial College London, London, SW7 2AZ, UK;

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原文格式 PDF
正文语种 eng
中图分类建筑科学;
关键词
ventilation effectiveness; buoyancy removal; transient flows; hybrid; natural; forced; effectiveness profile;

机译：通风效果;浮力去除;瞬态流动;混合;自然;强迫;效果图;

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Ventilation effectiveness measures based on heat removal: Part 1. Definitions

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