飞机座舱应用置换通风系统的节能分析

通过置换通风系统和混合通风系统的比较,阐述了置换通风系统的特点和优势.运用暖通空调领域设计置换通风系统的方法,并结合ISO7730 - 2005、ASHRAE62 - 1989和民航飞机相关标准对座舱通风的规定,以节能分析的方式得出了置换通风在飞机座舱通风系统应用上的节能优势.     

EnergyPlus软件在置换通风设计中的应用研究

介绍了EnergyPlus软件中的置换通风模型,采用EnergyPlus辅助某办公室置换通风系统设计,并采用CFD软件模拟了室内温度分布,结果表明,EnergyPlus可以精确地预测置换通风系统负荷,系统设计能满足热舒适要求。     

地板送风与置换通风特性比较

介绍了置换通风与地板送风的原理。从原理出发,对地板送风与置换通风在气流组织、通风效率、 空气品质和热舒适等方面的特性进行了比较。     

保证室内空气品质的置换通风的节能研究

介绍了置换通风的原理及其能够改善室内空气品质的原因,运用送风量及送风温度的公式,对置换通风及混合通风进行了计算比较。通过具体工程实例的计算表明:置换通风其送风量比混合通风的送风量减少16.7%,节约能耗41%,新风节能2.46W,是一种能改善室内空气品质的节能方法。     

置换通风与混合通风系统的比较研究

在分析空调系统置换通风和混合通风原理的基础上,从研究置换通风和混合通风气流组织特性出发,系统地分析比较了两种通风方式的通风效果及室内空气品质,并且对置换通风能耗等方面进行了分析。指出置换通风是一种高效、节能、高品质的通风方式。     

剧场观众厅空调风系统设计及数值模拟

介绍了大连市开发区文化中心主剧场观众厅的空调风系统设计方案。建立该主剧场观众厅有关速度场和温度场的数学模型,利用ICEMCFD和Fluent软件采用SIMPLE算法对此大空间内的气流组织和温度分布进行模拟,验证了设计方案的可行性,设计中采用置换通风的通风效率可达到1.67。     

置换通风与混合通风室内舒适性对比研究

针对一个典型办公室,建立了置换通风系统和混合通风系统的物理模型及数学模型.利用AirPak软件对室内温度场、速度场进行了模拟计算,对比分析了置换通风和混合通风两种通风方式的舒适性.     

多污染热源置换通风的应用与节能

简述了多污染热源置换通风的原理、特性及其与混合通风的比较 ,列举了工程应用实例 ,并对其节能效果进行了分析讨论 ,指出多污染热源置换通风是一种值得推广的通风方式     

封闭式焊接车间的节能型通风方式

通过对焊接工艺的相关特点--焊接烟尘和焊接烟羽的分析,在常用的工业厂房全面通风方式中选取置换通风作为封闭式焊接车间的通风方式,并用CFD分别模拟采用置换通风和采用混合通风的封闭式焊接车间,通过对比得到置换通风的优越性--节能.     

置换通风应用于计算机机房建筑的分析探讨

根据计算机机房建筑特点 ,从冷却效果 ,空气品质 ,人员舒适感等方面对机房分别采用下送上回式、置换通风式两种气流组织进行理论分析 ,同时通过对比送风量对耗能进行了初步探讨 ,得出置换通风是一种高效的通风方式     

Review of research into and application of chilled ceilings and displacement ventilation systems in Europe

This paper discusses the origination, development and current status of chilled ceilings, displacement ventilation and combined systems. Current knowledge of chilled ceilings (including ceiling panels and beams), displacement ventilation and combined systems is summarised and a comprehensive review of research into chilled ceilings and displacement ventilation systems is presented. Research work has been categorized, and some conclusions made. Opportunities for further work are discussed. Copyright © 2004 John Wiley & Sons, Ltd.     

Energy efficient room air distribution

An environmental chamber has been used to compare the effectiveness of mixing and displacement ventilation in terms of heat and contaminant removal. Results are presented for CFD simulations of the air movement in the chamber and for measurements using a heated mannequin with displacement ventilation. The CFD simulations and the measurements suggest that displacement ventilation is more energy efficient than a mixing system.     

Simulation of Velocity and Temperature Distributions of Displacement Ventilation System with Single or Double Heat Sources

In order to obtain a better understanding of flow characteristics of displacement ventilation,thethree-dimensional numerical models are developed using the CFD technology.The numericalsimulation results are verified by experiments,based on this,the velocity and temperature distributionof three-dimensional displacement ventilation system with single and double heat sources are studied.Velocity and temperature fields under two different cases of heat source are analyzed and compared.The numerical results show that there are three layers in vertical temperature fields of displacementventilation system with single or double heat sources,and the vertical temperature distribution ofsingle heat source is different from that of double heat sources.When indoor load is large,the comfortrequirement of people indoor can't be satisfied with displacement ventilation system only,thus anadditional refrigeration system is necessary.Furthermore,under the condition of two heat sources,thedisplacement ventilation parameters can't be computed simply according to single heat source inletparameters,therefore the interaction between heat sources should be considered.     

Numerical visualization of mass and heat transport for mixed convective heat transfer by streamline and heatline

Based on the method we suggested in a previous paper [Int. J. Heat Mass Transfer 45 (2002) pp. 2373-2385], the present work is to investigate the mixed convection problem. A two-dimensional, steady, laminar displacement ventilation model is adopted here for the interaction between the buoyancy driven natural convection and the external forced convection is important to achieve the goal of ventilation effectiveness. The solution is determined by the non-dimensional parameters Gr and Gr/Re², the influences of which on the resulting heat and fluid flow are discussed. To optimize the ventilation system, different outlet locations are investigated. Results and comparisons show that the displacement ventilation guarantees a high indoor air quality (IAQ) and is therefore a desired air-conditioning system.     

Experimental study of thermal stratification in ventilated confined spaces

Within the displacement ventilation (DV) field, this paper presents an experimental study of thermal stratification in a ventilated room in which there is a heat source. The ventilation system maintains plume development up to a limiting height, above which the air stream is mixed. Temperature stratification arises within the test room. Its interface is of significant thickness and its position is identified by that of the maximum standard deviation of temperature fluctuations. The change in the height of this interface is studied under different experimental conditions. Results confirm the laws already obtained for zones close to and far away from the source and they also allow a law governing the transition between these two zones to be proposed.