风机盘管加新风系统室内PM2.5污染控制

在对民用建筑通风系统常用过滤器滤料性能测试基础上,建立了常规风机盘管加新风系统空调房间室内颗粒物浓度集总参数模型,讨论了回风过滤段和新风过滤段过滤器效率的设计选型方法。以西安市某空调系统为例,为满足室内PM2.5污染控制标准,基于室外PM2.5浓度"不保证10d"取值计算,结果表明,余压为50~80Pa的机组回风过滤器效率选用G3、G4型过滤器,余压为30~50Pa的机组回风过滤器效率选用初效G2、G3型过滤器,同时,室内设置等效过滤效率的空气净化器,新风选用初效G4加中效F7或F8两级过滤。     

节能型低噪声卡式双吹风机盘管

介绍了节能型低噪声卡式双吹风机盘管机组采用的新型卡式双吹风结构,其特点是采用了U形单排管换热器、下置式风机组件、波浪形过滤网等部件。通过对这些部件的合理布置,大幅度降低机组能耗及噪声,保证了产品输入功率及噪声指标,解决了传统盘管在实际运行时风量小的问题,有效提高了空调房间的舒适性。     

水蓄冷式末端盘管热泵机组空调系统

介绍一种水蓄冷式空调系统，使用风机盘管与水冷热泵一体的空调机组末端装置，实现了蓄冷空调模式与末端热泵空调模式并存与互补。与普通风机盘管式空调系统类似，但末端具有电制冷能力，能实现制冷供暖，蓄热蓄冷，大温水循环，有效回收利用余热     

Optimization of cooling coil performance during operation stages for improved humidity control

In hot and humid climates, indoor humidity levels are usually high and this is a matter of concern from Thermal Comfort and IAQ perspectives. This phenomenon can be attributed to the inadequate dehumidifying performance of the cooling coil. Amongst other factors, poor dehumidifying coil performance results from the selection and installation of an oversized coil and the conventional strategy of modulating the chilled water flow rate as the only available control method. It is not uncommon to find that operating conditions demand a reduced chilled water flow rate not just during part load conditions but even during the actual peak load condition. Based on a simulation method that involves selection of coils for different conditions, this paper presents the findings of the performance evaluation of an oversized coil at different conditions during the operation stage. The findings show that the dehumidifying performance of the oversized coil at reduced loads during normal operation can be significantly enhanced by changing the effective surface area of the coil through a simple manipulation of the effective number of rows of coil operation.     

一种新型直接膨胀式温湿度独立控制恒温恒湿空调系统

为了消除传统恒温恒湿空调系统中冷热抵消现象,提出了一种新型直接膨胀式温湿度独立控制恒温恒湿空调系统(下称新型空调系统).该空调系统通过组合三级直接膨胀式制冷单元、加热器、加湿器,并配备特有的控制策略,可以在满足恒温恒湿环境一定温湿度控制精度的前提下,实现温湿度解耦控制.该空调系统不会造成投资成本大幅增加,并具备结构简单...     

机房专用恒温恒湿空调机组的基础设计

结合制冷、传热、流体力学等基本原理,详细介绍了机房空调的制冷、气流、控制系统的关键部件的计算、选型及设计方案。     

Space temperature difference,cooling coil and fan—energy and indoor air quality issues revisited

In designing an energy-efficient air-conditioning system that also simultaneously addresses the needs of adequate ventilation and acceptable indoor air quality, several factors begin to play an important role. Among several others, the cooling coil, the fan and the temperature difference between the space and the supply air (commonly known as the Space ΔT) can be considered to be crucial. For a given space cooling load, the choice of a particular Space ΔT has an implication on the amount of supply air required, which further has an impact on the performance of the cooling and dehumidifying coil as well as the fan. Inherent in these implications are issues related to energy, ventilation and indoor air quality. This paper investigates these implications and quantifies them by considering a hypothetical building in a tropical climate and subjecting the design to several parametric variations involving different Space ΔTs for a given space temperature and humidity condition. The total power requirements, comprising additional cooling, reheating and higher fan power, for a design involving a Space ΔT of 5 °C can be as high as a factor of 2.2 of the total power for a design with a Space ΔT of 8 °C. The implication of higher supply air flow rates on duct design is qualitatively discussed. For a given space cooling load and a given Space ΔT, the implication of increased design ventilation rates to address part-load ventilation requirements can lead to an additional installed cooling capacity of 17.5%. Finally, emerging technologies that are aimed at addressing both energy efficiency and IAQ are discussed.     

住宅单管供暖系统分室温度控制手段及其热工特性

根据新的建筑节能设计标准提出的“分室控制温度”的要求，针对住宅供暖系统的主要制式－工管的式控制，从理论和实际工程经验方向提出了可行对策。     

水泥实验室温湿度控制系统的改进

1前言 　　水泥物理性能试验,从标准稠度用水量、凝结时间的测定以及胶砂强度的成型和养护对环境温、湿度要求都非常严格.水泥试验室的温、湿度控制是目前很多试验室感到比较头痛的一件事,尤其是对养护室水温和养护箱内温湿度的控制,标准要求应达到(20±1)℃,一些试验室很难达到.要达到以上规定,就需要试验室根据自身的条件进行合理的保温装修,空间调整,以及改进控温系统.下面介绍一下笔者所在单位的一些改造经验,以供参考. 　　……     

工程机械柴油机风扇变速温控系统

本文介绍了在发动机冷却系统中,引用微机与液力偶合器技术实现温度控制的研究。该技术是微机应用于机动车辆,实现机—电—液一体化设计的综合控制系统。通过理论分析与实验室试验确认此自动控制方案是可行的。     

机房专用恒温恒湿空调机组的相关热点问题

探讨了机房专用恒温恒湿空调机组设计的若干热点问题,并提出了笔者的观点.     

机房专用恒温恒湿空调机组的优化设计

根据笔者的研发经验,结合制冷、供热、流体力学等基本原理,详细论述了机房空调制冷气流和控制系统关键部件的优化设计方案.     

Development of room temperature and relative humidity linear parametric models for an open office using BMS data

This study investigates Box-Jenkins (BJ), autoregressive with external inputs (ARX), autoregressive moving average with external inputs (ARMAX) and output error (OE) models to identify the thermal behaviour of an office positioned in a modern commercial building in London. These models can all be potentially used for improving the performance of the thermal environment control system. External and internal climate data, recorded over the summer, autumn and winter seasons, were used to build and validate the models. The paper demonstrates the potential of using linear parametric models to predict room temperature and relative humidity for different time scales (30 min or 2 h ahead). The prediction performance is evaluated using the criteria of goodness of fit, coefficient of determination, mean absolute error and mean squared error between predicted model output and real measurements. The results demonstrate that all models provide reasonably good predictions but the BJ model outperforms the ARMAX and ARX models.     

带冷凝热回收的直流变频恒温恒湿空调机组热湿分控实验研究

基于已有的带冷凝热回收的直流变频恒温恒湿空调机组,提出了一种串级控制的热湿分控方法。为了验证该控制方法的可行性,对机组出风温湿度控制效果和被控房间的温湿度控制效果进行了测试。实验结果表明,采用该控制方法的恒温恒湿机组能满足实验工况下的热湿控制要求,送风温度控制精度为±0.2℃,送风含湿量控制精度为±0.2g/kg,被控房间的干球温度控制精度为±0.04℃,被控房间的露点温度控制精度为±0.02℃。     

Use of personalized ventilation for improving health,comfort, and performance at high room temperature and humidity

The effect of personalized ventilation (PV) on people's health, comfort, and performance in a warm and humid environment (26 and 28°C at 70% relative humidity) was studied and compared with their responses in a comfortable environment (23°C and 40% relative humidity). Thirty subjects participated in five 4‐h experiments in a climate chamber. Under the conditions with PV, the subjects were able to control the rate and direction of the supplied personalized flow of clean air. Subjective responses were collected through questionnaires. During all exposures, the subjects were occupied with tasks used to assess their performance. Objective measures of tear film stability, concentration of stress biomarkers in saliva, and eye blinking rate were taken. Using PV significantly improved the perceived air quality (PAQ) and thermal sensation and decreased the intensity of Sick Building Syndrome (SBS) symptoms to those prevailing in a comfortable room environment without PV. Self‐estimated and objectively measured performance was improved. Increasing the temperature and relative humidity, but not the use of PV, significantly decreased tear film quality and the concentration of salivary alpha‐amylase, indicating lower mental arousal and alertness. The use of PV improved tear film stability as compared to that in a warm environment without PV.     

洁净厂房温湿度精密控制深化设计和项目实施

提出应根据设计要求及洁净室设备及人员情况选择控制器,确定输入输出参数和传感器、自动调节阀的数量和安装位置,介绍了项目实施时应注意的问题。     

温湿度独立控制系统用干式显热风机盘管的研究

介绍了温湿度独立控制系统(THICS)对其末端设备干式显热风机盘管的特殊需求,建立了该类产品的模拟计算模型.对依据模拟计算结果试制出的干式显热风机盘管产品在不同工况条件下进行了大量制冷试验研究,以期为干式显热风机盘管的产品研发和工程实际应用提供参考.     

温湿度独立控制空调系统的应用

通过分析常规空调系统,提出温湿度独立控制空调系统不仅可以节约能源,同时能有效解决温湿度比变化等问题,有一定的发展前景,最后针对现阶段温湿度独立控制空调存在的弊端提出了改良方法。     

温湿度独立控制空调系统设计方法

介绍了温湿度独立控制空调系统的设计方法及性能评价方法。详细介绍了其设计参数选取、负荷计算和设备选型方法等,研究了其与常规空调系统的差异。以某建筑为例,利用DeST软件模拟逐时负荷,分别进行温度、湿度控制系统的设备选型。     

温湿度独立控制系统中最小新风量计算方法研究

通过对全面通风方程的分析,对实测数据和计算数据进行比较,验证了全面通风方程用于求解室内含湿量的正确性。并将此方程应用于温湿度独立控制系统最小新风量的求解中,通过引入预除湿时间,解决了原有最小新风量求解方法的不足。通过数据比较,分析了预除湿时间以及送风含湿量对最小新风量的影响,认为只有综合考虑最小新风量、预除湿时间及送风含湿量才能实现温湿度独立控制系统的优化设计。