一种简便实用的湿空气性质计算方程

根据文献数据对几个蒸汽压力经验方程、水汽化潜热方程等进行数理统计处理，给出了几个经验方程，并运用这些经验方程建立了一种简便实用、精确度高的湿空气性质计算方程。     

湿空气的焓湿图

空调工作者，简言之就是同空气打交道。当然要对空气的成分、物理性质有所了解，并对要做处理的空气状态、参数及它们之间的关系有明确的概念。通常所说的空气是指自然状态下的湿空气，而湿空气是由干空气Gg和水蒸气Gs组成：     

湿空气热湿转换过程的热学原理

讨论了湿空气处理过程中的传热、传质和相变过程,针对实际工程中的一些困惑,提出了基于(火积)的新的热学分析方法.用这一方法,可以得到空气处理过程中各种(火积)损失的构成,清晰地看到空气等焓喷水加湿过程与沿饱和线加热加湿或冷却除湿过程的巨大差异,找到各种工程条件下最好的湿空气处理途径.介绍了基于(火积)的湿空气热湿转换过程分析方法,对一些典型工程问题进行了深入分析.     

空调过程的热质平衡计算分析

本文明确了空调系统在空调设备的有关热质平均计算中应采用干空气质量流量来计算，否则会带来计算误差和概念误差，并在充分考虑湿空气质量流量变化的情况下，推导出了新的喷水室热工计算方法，并与其他文献提供的方法进行了分析比较。     

多孔建筑材料热湿物理性质测试方法与现状综述

多孔建筑材料的热湿物理性质是利用热湿耦合模型分析围护结构的热湿传递所需要的基本输入参数.通过对多孔建筑材料典型热湿物理性质的测试方法进行归纳,并总结国内外的测试现状,探讨完善多孔建筑材料热湿物理性质研究的方向.分析表明,当前世界各国对多孔建筑材料热物理性质的测试相对成熟,而湿物理性质的测试则存在适用范围有限、结果准确度...     

湿空气相对湿度的一种计算方法

利用工程热力学的基本知识推导了计算式，并与传统的计算方法进行了比较。新计算式形式简单，物理意义明确，计算较准确。     

湿空气参数的VB计算法

针对湿空气参数计算繁琐的特点，本文提出了采用计算机计算的方法，并提供了流程和设计思路。实际计算证实，该程序是准确有效的。     

湿空气的湿度计算及其在干燥热工中的应用

<正>在干燥室内利用热气体借对流作用传热给砖坯,砖坯得到热量后将水分蒸发为潮气排出室外,气体在整个干燥室内起着充当热能交换和水汽传递的媒介物。砖瓦干燥热工中常将这种媒介物称为介质。最常     

基于手机平台下的湿空气状态参数计算

鉴于暖通空调设计人员在设计时经常要翻看湿空气焓--湿图来查找相应参数的繁琐和目前手机已经普遍使用的现实情况,本文运用J2ME技术编制程序,将常用的标准大气压下的湿空气焓.湿图上的一系列状态参数嵌入手机当中计算,此项技术可以极大地方便暖通空调设计和研究人员快速地获取所需要的湿空气状态参数,具有较高的实用价值.     

一种求解湿空气温度和相对湿度的CFD算法

以往在用计算流体力学 (CFD)方法计算空气温度时 ,仅考虑空气显热 ,导致计算温度与实际情况相差较大。提出一种考虑潜热的计算房间温度和相对湿度的CFD方法 ,将两种计算结果进行了比较 ,发现前者的计算结果较后者约高 0 .5～ 1℃。     

Estimation of thermophysical properties using natural signal analysis with heat and moisture transfer model

Conduction heat transfer through opaque envelope components characterizes the thermal performance of buildings and its consequences in terms of energy consumption and thermal comfort. A building envelope can be thermally described by two parameters: thermal conductivity (λ) and heat capacity (ρ·c). Estimating these thermal properties in situ allows the characterization of real building elements considering different aspects, such as thermal behavior under specific weather conditions, quality variability in materials, local construction technologies and material deterioration. This paper presents a method to estimate the thermal conductivity and volumetric heat capacity of a homogeneous element using a non-destructive test considering natural oscillations. Surface temperature and heat flow are measured in a concrete sample (with known thermal properties) and the data is treated with a signal processing technique. Estimation is carried out with a heat and moisture transfer model. Measurements were performed on six separate days under different sky conditions within a period of one month, to determine the importance of solar radiation as a heat source. Results gave acceptable estimates (average inaccuracy of 10-14%) of both thermophysical properties.     

Influence of air humidity and the distance from the source on negative air ion concentration in indoor air

Although negative air ionizer is commonly used for indoor air cleaning, few studies examine the concentration gradient of negative air ion (NAI) in indoor environments. This study investigated the concentration gradient of NAI at various relative humidities and distances form the source in indoor air. The NAI was generated by single-electrode negative electric discharge; the discharge was kept at dark discharge and 30.0 kV. The NAI concentrations were measured at various distances (10-900 cm) from the discharge electrode in order to identify the distribution of NAI in an indoor environment. The profile of NAI concentration was monitored at different relative humidities (38.1-73.6% RH) and room temperatures (25.2+/-1.4 degrees C). Experimental results indicate that the influence of relative humidity on the concentration gradient of NAI was complicated. There were four trends for the relationship between NAI concentration and relative humidity at different distances from the discharge electrode. The changes of NAI concentration with an increase in relative humidity at different distances were quite steady (10-30 cm), strongly declining (70-360 cm), approaching stability (420-450 cm) and moderately increasing (560-900 cm). Additionally, the regression analysis of NAI concentrations and distances from the discharge electrode indicated a logarithmic linear (log-linear) relationship; the distance of log-linear tendency (lambda) decreased with an increase in relative humidity such that the log-linear distance of 38.1% RH was 2.9 times that of 73.6% RH. Moreover, an empirical curve fit based on this study for the concentration gradient of NAI generated by negative electric discharge in indoor air was developed for estimating the NAI concentration at different relative humidities and distances from the source of electric discharge.     

建筑外窗气密性能对保温性能影响分析

建筑外窗作为建筑围护结构中的轻质、薄壁构件,其能耗往往占到整个建筑能耗的三分之一左右。实际工程应用中外窗保温性能不仅受制作材料影响,受气密性能影响也很大。根据近几年国家对节约能源走可持续发展的要求,建筑外窗保温的检测、评判应面向实际应用。     

湿空气在肋片表冷器上的传热传质及肋片效率

分析了肋片式表冷器在湿工况下的传热传质过程,认为表冷器对空气进行冷却减湿过程中不遵循路易斯关系式,推导出在湿工况下的冷却能力及肋片效率,计算表明当肋表面出现凝结时,会增加表冷器的冷却能力并影响片效率。     

多层建筑冷空气渗透风量和能耗计算软件的研究

在对多层建筑冷风渗透原理研究的基础上，开发出了多层建筑冷风渗透风量及能耗计算软件。此计算软件简单易用、准确直观，能计算不同地区、不同类型建筑的渗风量和渗风能耗，可以用柱形图或表格形式显示计算结果。     

空气源热泵风侧换热器上湿空气状态的计算机模拟

用计算机模拟空气源热泵风侧换热器在不同环境温度和相对湿度条件下运行的热力特性。计算出换热器肋片管表面温度后，根据水的相图判别肋片管上湿空气的干工况、凝露和结霜三种状态。模拟结果表明，环境温度5℃左右，相对湿度高于67％，风侧换热器肋片管易结霜；环境温度越低，则越不容易结霜。     

Contaminant particles removal by negative air ionic cleaner in industrial minienvironment for IC manufacturing processes

This study was carried out in a closed test chamber under natural decay, negative ionic air cleaner application, as well as air mixing mechanism with negative ionic air cleaner. Among three operation modes, the air mixing mechanism with negative ionic air cleaner can reduce particles better under the flow field condition. In the air mixing, especially vigorous one (5 ACH (Air Changes per hour)), enhanced the air cleaning effect. The highest removal efficiency was measured at a height of 0.6 m from the floor and it was decreased substantially with an increase in height. The relative effectiveness of negative ionic air cleaners was predicted to decrease with an increasing particle size. We also found that there was a limited horizontal diffusion of ions. The empirical curves fit based for the concentration gradient of NAI (Negative air ionization) generated was developed for estimating the NAI concentration with different heights and distances from the source of negative ionic air cleaner discharge.