民居节能建筑外墙保温层最优厚度仿真

为提高建筑外墙保温层厚度计算结果的精度,提出基于LCCA(Life Cycle Cost Analysis)的民居节能建筑外墙保温层最优厚度计算方法。根据采暖度日数、建筑物围护结构的传热阻等值计算建筑外墙热损失。利用保温层投资与采暖燃料投资相加所得值,获取单位面积建筑外墙保温层的生命周期范围内总投资。采用反应系数法与z传递函数法分析并计算围护结构非稳态逐时热流。结合外墙热损失、保温层使用寿命内费用和墙体逐时热流分析结果,计算民居节能建筑外墙保温层最优厚度。实验发现,保温层存在一个最优厚度,可以使建筑的总费用降到最低;相同保温材料,最优保温层的厚度会随着现值因子增大不断增大,随着采暖度日数增大逐渐增大,随着非保温层热阻值增大不断减小;保温材料不同,最优保温层厚度的差异体现在随着现值因子、采暖度日数增大逐渐增大,随着外墙的非保温层热阻值增大逐渐减小;保温层最优厚度计算结果与实际值拟合度高。     

基于Matlab的绝缘材料电气性能测试系统设计

针对传统的绝缘性能测试仪存在功能单一和无法兼容频域介电响应等新方法的问题,通过选用常见设备,设计了一套基于Matlab绝缘材料电气性能测试系统。该系统利用前置滤波器消除了频率响应函数对系统输出的不利影响,使系统不仅拥有常规的直流跟工频检测功能,也具备在50Hz-1kHz频率范围内进行电压试验的能力,测试时的最高电压能够达到10kV。通过测量试验中流过介质的漏电流,该系统适用于对被测物的绝缘性能进行综合的评估。试验结果表明该系统达到了设计指标,并且能够满足日常工作中的测试需要     

基于MSP430F149的数字式绝缘电阻测试仪

本文介绍一种采用MSP430F149单片机设计的数字式绝缘电阻测试仪，详细说明了各部分电路的组成及功能，并介绍了该系统的软件设计。采用这种方法研制的绝缘电阻测试仪具有体积小、功耗低和精度高等优点。     

正交实验法在炉渣保温砂浆中的应用研究

采用正交实验法研究炉渣粉作为细骨料的保温砂浆性能,结果表明:炉渣粉应用于保温砂浆,不仅具有良好的物理力学、热工和耐久性等宏观性能,还能起到节能环保的作用。     

历史保护建筑的生态节能更新——同济大学文远楼改造工程

具有包豪斯建筑风格的同济大学文远楼是我国现代保护建筑的典范之一,2005年同济大学与德国节能技术专家合作,运用当代最新的建筑节能技术,建立一套综合节能技术系统,为我国保护建筑的节能更新改造提供了范例,本文重点介绍一些改造技术的实践情况。     

The environmental impact of optimum insulation thickness for external walls of buildings

The city of Denizli is in the 3rd climatic region in Turkey and there is a heating requirement for a period of approximately five months. During this period, thermal insulation of buildings is very important in minimizing the energy usage and reducing emission. In this study, environmental impact of optimum insulation thickness in external walls has been investigated for the case of Denizli, Turkey. In the calculations, coal was used as the fuel source and the expanded polystyrene as the insulation material. The results proved that when the optimum insulation thickness was used, energy consumption was decreased by 46.6% and the emissions of CO₂ and SO₂ were reduced by 41.53%.     

红外辐射涂料原理和工艺方法研究

从红外辐射机理角度来研究具有建筑隔热保温作用的红外辐射涂料，包括原料的选配和合成工艺方法。     

复合材料在蓄能空调系统中的应用

介绍了蓄能空调系统中蓄能池防水保温体系的选材，成型加工方法，采用防水保温复合材料体系可以缩短蓄能池的施工周期，降低工程造价及运转费用，减少日常维护成本。     

Determining of heat balance design criteria for laying hen houses under continental climate conditions

This study focuses on the heat balance status of laying hen houses in regions with continental climate. The material consists of 45 laying hen houses from 27 commercial farms selected from the survey area where continental climate prevails. These laying hen houses differ from each other with respect to capacity, planning system and materials used in construction. First observations were conducted on the size and dimensions of laying hen houses as well as construction materials used, insulation, heat loss factors, ventilation capacity, ground space per hen and total size of laying hen house in order to assess the sufficiency of heat balance. Then, seven laying hen house models were developed. These models were developed by considering the present situation in operating laying hen houses, relevant literature, features of continental climate and suggestions made by firms manufacturing laying hen house construction materials in Turkey. These models give heat conduction coefficients that will prevent moisture concentration and ensure heat balance under continental climate conditions and suggest different sets of materials that can be used on walls and roofs. At the end of the study, under the condition of no moisture on surface of structural components and in areas where the indoor and outdoor temperatures are 25.3 °C and 20.2 °C, respectively, maximum total heat conduction coefficients are calculated to be between 1.38 and 1.73 Kcal/m² °C h. According to the features of area and housing, for providing heat balance, total heat conduction coefficients requirements are calculated to be between 0.62 and 2.08 Kcal/m² °C h for walls, 0.33 and 1.62 Kcal/m² °C h for roofs. In research area, minimum ventilation capacities are determined as 0.72 m³/h hen for carbon dioxide balance and, according to outdoor temperature, as 0.83–1.20 m³/h hen for water vapor balance. Heat loss factors are calculated to be between 0.10 and 0.15 Kcal/°C h hen. We believe that these suggestions will greatly facilitate the work of project engineers in the design of laying hen houses in regions and areas with continental climate.     

The influence of the zone's indoor temperature settings on the cooling/heating loads for fixed and controlled ventilation

In this study, the thermal performance and the energy requirements of a building single-zone are investigated for both the cooling and heating seasons by employing a thermal-network model. The model has six primary heat-flow paths, in order to take into account the position of insulation in the building envelope, and two secondary paths for the ventilation and the cooling/heating unit. The desired indoor temperature of the zone is defined by a pair of preset points of a thermostat. The energy demands and the resulting indoor temperature variations are determined for fixed ventilation as well as for temperature-controlled ventilation. Computer results for both seasons show how the combined influence of slab structure formations, the desired indoor temperature and ventilation control affect the cooling and heating loads.