蒸发冷却空调房间气流组织的数值模拟

应用κ-ε二方程湍流模型和数值模拟方法对蒸发冷却空调房间的三维温度场，速度场以及热舒适指标进行了模拟，研究结果表明，蒸发冷却空调器能够有效地改善室内热环境，较好地满足了人体热舒适在通风和空气调节方面的要求。常规满足最不利条件时空调要求的设计方案，适用于蒸发冷却空调的设计。     

供暖房间动态热环境及热舒适分析

将热舒适评价标准模型与供暖房间热环境动态数值模拟相结合，以西安地区为算例，对供暖房间１１个工况进行了室内动态热环境及热舒适模拟与分析，证实了现行规范的可行性．     

孔板送风对壁挂式空调房间热舒适性的影响

为研究孔板送风方式对壁挂式空调房间热舒适性的影响,采用Airpak软件分别对在相同送风量和送风温度下采用传统射流送风和孔板送风的气流组织进行数值模拟,通过对温度场、速度场、PMV-PPD值的对比分析,评价两种送风方式下的室内热舒适性,并采用实验测试的方法,对模拟结果的准确性进行实验验证。结果表明:送风方式对室内热舒适性影响明显,孔板送风对室内气流组织的改进和热舒适性的提高有较显著效果,夏季工况采用孔板送风可以起到节省能耗的作用。     

家用空调器新风引入前后室内气流组织的对比

现代人们对室内环境的要求不仅仅局限于热湿环境,室内空气品质也越来越受到人们的关注.家用空调器新风引入成为空调器发展的必然趋势,本文针对家用分体空调器的房间顶部新风独立引入方式以及无新风独立空调器的室内温度场和速度场进行了数值模拟,模拟结果表明新风引入前后室内人员周围的热环境变化很小.     

基于CFD的室内热环境模拟研究

本文首先对室内热环境的评价指标和热舒适的定义作了简单概述,然后以现场测试过的房间为模型房间,建立相应的数学模型,并以测试到的一部分参数为边界条件,采用CFD程序里的k-ε方程模型对重庆大学学生寝室室内热环境参数分布进行了模拟,并结合现场测试结果进行比较分析,表明温度场的实验结果与模拟分析结果趋于一致,说明本文对室内热环境的模拟过程的数学模型是合理的.最后,对房间温度场和速度场的模拟结果进行了分析,同时对房间不同时刻模拟计算所得的模拟数据进行比较分析,指出室内热环境发生变化的原因,并得出寝室热舒适的评价.     

会议室空调气流组织的数值模拟研究

利用Airpak软件对夏季使用落地式空调器制冷的某会议室气流组织进行数值模拟,研究了空调器位置设置不同对室内热舒适的影响,得到不同室内气流组织下速度场与温度场的分布,采用PMVPPD与空气龄指标对室内人员的热舒适性与空气品质进行评价。模拟结果表明,在东墙布置落地式空调的方式在改善工作区域空气品质以及人体热舒适性方面均优于南墙,为气流组织优化设计和空调室内热舒适性环境的改善提供了参考。     

炕、散热器、火墙供暖房间热环境数值模拟研究

用数值模拟的方法对比吊炕、火墙、散热器供暖房间和传统落地炕、火墙、散热器供暖房间的热环境分布.模拟了采暖房间Y=2 m平面的温度分布云图,计算出两种房间的热舒适PMV指标和PPD.通过分析得出,吊炕、火墙、散热器供暖房间的热环境比较舒适,长期使用吊炕节能效果明显.     

重庆住宅壁挂式空调供暖期间的通风方式研究

通过对重庆地区住宅冬季主要供暖方式-壁挂式空调的供暖效果进行实测分析,供暖期间房间内温度分层和新风不足现象明显。针对居民在壁挂式空调供暖期间开窗通风的使用行为习惯对供暖舒适性和能耗的影响,笔者提出了一种适用于重庆地区住宅冬季壁挂式空调供暖与通风协同运行解决方案,并通过数值模拟验证其可行性。该结果可为该地区住宅冬季室内热环境调控提供参考。     

冬冷夏热地区地板辐射采暖的现场测试和模拟研究

本文首先对地板辐射采暖房间进行现场测试,得到房间布点位置的温度和湿度,为数值模拟边界条件的设置提供依据.利用CFD对房间进行了数值模拟,得出了房间的温湿度分布、气流的运动状态和房间热舒适性评价指标（PMV-PPD）等,对房间的热舒适性进行了总体分析评价.     

通风降温建筑室内热环境模拟及热舒适研究

将热舒适评价标准ＰＭＶ／ＰＰＤ模型与建筑动态热模拟及计算流体动力学（ＣＦＤ）模拟相结合，分别对重庆地区自然通风房间和埋管送风通风房间进行了室内气候及热舒适性模拟与分析，结果表明，埋管系统通风降温可以改善炎热地区的室内热舒适性。     

办公室柜式分体空调的室内热舒适性探讨

分析了柜式分体空调的室内热舒适性问题。在室内办公人员密度大、办公工位密集的场所,选用柜式分体空调容易出现气流分布过于集中的情况,从而导致办公室工位热舒适性的差异较大,出现工位弃用的现象,造成办公工位面积的浪费和空调用能浪费。合理的空调方案和室内气流组织不仅能够保证高效的学习和工作,还会降低空调的使用能耗。     

A neural network evaluation model for individual thermal comfort

An evaluation model for individual thermal comfort is presented based on the BP neural network. The train data came from a thermal comfort survey. The evaluation results of the model showed a good match with the subject's real thermal sensation, which indicated that the model can be used to evaluate individual thermal comfort rightly. Taken a room air conditioner as an example, the application of the NNEM in creating a microenvironment for individual was discussed. The result showed that the NNEM can play an important role of connecting individual thermal comfort with the control on the air conditioner.     

分体空调不同新风引入方式热舒适性实验研究

选择典型的装有分体空调的办公室,对多种不同新风引入方式下的室内环境参数作了测试。通过使用PMV-PPD热舒适度评价方法,分析比较了不同新风引入方式对室内热舒适度的影响,指出了采用低位小新风量空调低风速引入方式时室内热舒适度最好,为以后进行户式空调系统新风引入设计提供了设计方向。     

碰撞射流通风供暖房间热环境特征的研究

采用数值模拟方法研究了碰撞射流通风系统的供热特性,对供热房间内热环境特征以及热舒适性的分析结果表明：在典型送风参数工况下,碰撞射流供热房间内靠近送风口附近位置处存在垂直温度分层,空气温度随房间高度增加而降低,工作区热舒适情况良好。     

Research on seasonal indoor thermal environment and residents' control behavior of cooling and heating systems in Korea

Indoor thermal environments and residents' control behavior of cooling and heating systems were investigated in Seoul, Korea and compared with the results of previous studies. Twenty-four houses in summer, six houses in autumn and 36 houses in winter were used in this study. The measurement of temperature, humidity and air conditioner usage behavior was carried out. The clo-value, thermal comfort, sensation and basic data of the houses were also investigated. The indoor thermal environment in the summer had a high temperature and a high humidity ratio compare to standard comfort zone. Most of the indoor thermal environments at the time of starting the air conditioner in the summer were out of the comfort zone. Some of the data recorded while the air conditioner was stopped were in the comfort zone, but in many cases the temperature was relatively higher than comfort zone. Most indoor climate distributions in the winter were in the comfort zone and the indoor climate in autumn coincided well with the criteria of the comfort zone. Compared with results of previous studies in these 25 years, indoor ambient average temperature in winter has increased and the comfort temperature has increased in the heating period and decreased in the cooling period. This result indicates that the development of an HVAC system has created an expectation of comfort for residents and has shifted their thermal comfort zone warmer in winter and cooler in summer.     

轻型电热地垫用于间歇采暖建筑适宜性研究

通过实验的方法研究了轻型电加热地面辐射采暖应用于间歇采暖建筑的适宜性,从舒适性、响应时间、能耗三方面对比了空调送风和电热地垫的特点：电热地垫加热房间下部所需时间更短,响应时间上更占优势;稳定后电热地垫采暖房间下部操作温度较上部高,空调送风采暖时情况则相反;定义用能有效性参数e衡量不同采暖方式对房间下部加热的效果,电热地垫采暖的e约为0．5左右且受加热功率的影响较小,而空调送风采暖的e比电热地垫低且随加热功率增大而减小。研究结果表明,电热地垫采暖房间垂直温度梯度小,对房间下部加热效果较空调送风要好,在一定程度上补偿了其制热效率低的不足。在室内环境控制18℃左右的情况下,权衡了COP和加热有效性,使用两种采暖方式用电量相近。     

建筑西向房间夏季室内热环境改善

以国内某大学综合实验大楼为例,实测了其中一间西向房间的室内外空气温度与壁面温度,分析了其夏季室内热环境。为了在经济合理地使用能源的情况下,满足它对夏季冷量与冬季热量的需求,根据实测的数据,利用建筑热平衡原理,对其夏季室内热环境特性进行了分析,指出了其热工设计缺陷,并对其进行了热舒适性的改造。通过软件模拟出改造后房间室内空气温度值,对比改造前后室内空气温度值,结果显示改造后的温度值明显降低,热舒适性得到了改善。     

Airflow analysis in an air conditioning room

The aim of superior air conditioning system is no longer constrained to advancing the efficiency of cooling machine, but includes the study of airflow with the assistance of the distribution of several significant parameters. A simple numerical study of the turbulent flow over an enclosed air conditioning system was not practicable a few decades ago since the computer facilities were not sufficient. In this paper, a standard office room was taken up for simulation. Temperature and velocity distribution over various virtual planes for different locations of the air conditioner blower were analyzed to achieve the maximum comfort for the occupant. With Fluent, as solution tool, k–epsilon and Reynolds stress models for turbulence flow were used for the analysis. The different locations of blower placement are analyzed for better comfort of occupant in the room and it is found that the occupant will experience most comfort if the air conditioner blower is placed on location II compared to the other two locations. This work can also be extended to a more complex air conditioning system like in the industries, hospitals as well as the gigantic shopping malls.     

Influence of the ventilation system on thermal comfort of the chilled panel system in heating mode

In heating mode, fresh air is still essential for a chilled panel system in order to ensure the indoor air quality. In this paper, a chilled ceiling panel system was designed and built in a typical office room. The thermal environment and thermal comfort in the room were fully measured and evaluated by using the Fanger's PMV-PPD model and the standard of ISO 7730 respectively, when room was heated in two modes, one of which is the chilled panel heating mode and the other of which is the combined heating mode of chilled panel and supply air. The research results indicate that in the combined mode, ceiling ventilation improves the general thermal comfort and reduces the risk of local discomfort. Under the condition of same general thermal comfort, the heating supply upper limit of chilled panel can be increased by 12.3% because of air mixing effect caused by introduction of air ventilation.