无锡市某医疗卫生建筑空调系统冷热源方案技术经济分析

为了能够使医疗卫生项目空调系统冷热源方案的选择更加合理,比较了多种空调冷热源方案,分析了初投资和运行费用,通过这种对不同冷热源方案进行比较分析,得到了该医疗建筑空调系统的最佳冷热源方案。     

某办公楼建筑空调冷热源方案分析

针对唐山市某办公楼实际工程,提出了水冷压缩式制冷机组+市政热网、土壤源热泵系统和多联机空调系统三种适合该工程的冷热源方案,并针对这三种方案从设备初投资和系统运行费用方面进行了比较,并结合初投资和运行费用进行了三种方案的综合比较,最终得出了土壤源热泵系统作为该工程的冷热源是更为经济、节能、环保的选择。     

某超高层建筑空调冷热源配置浅探

以某超高层建筑为例，比较了不同的冷热源配置方案，就初投资和运行费用进行了分析，并最终选择了合理的冷热源配置方式。     

某宾馆热水系统改造方案经济性对比分析

对某宾馆热水系统改造的不同方案进行了计算分析,结果表明,采用单台600RT螺杆式冷水机组显热热回收可以减少运行费用22.7万元,其初投资为122万元,投资回收期为5.4年;采用单台600RT螺杆式冷水机组全热热回收可以减少运行费用31.8万元,初投资为128万元,投资回收期为4年;采用单台120RT热泵热水机组+500RT离心式冷水机组增加了3.7万元运行费用,初投资为177万元。     

贵阳某数据中心暖通空调系统冷热源经济分析

针对贵阳某数据中心暖通空调冷热源不同设计方案进行技术经济分析,以不同冷热源方案分别作方案初选分析、初投资费用和年运行费用的计算。通过计算不同方案全生命周期的费用现值,分析得到费用现值最低的方案,同时对该方案进行敏感性分析。目的是通过全面的分析选择出经济和节能的冷热源方案,尽可能降低数据中心电能能耗系数（PUE）值,达到绿色节能的建设要求。     

冷热电联供系统中凝结水用于制冷系统的技术经济性分析

冷热电联供系统中,蒸汽双效型溴化锂吸收式冷水机组的凝结水具有一定热量。本文以郑州某项目为例,对蒸汽凝结水作为热源水驱动新增加热水型溴化锂吸收式冷水机组实现制冷进行研究。此蒸汽凝结水回收制冷系统的静态投资为101.4万元,年售冷收入为26.1万元,年运行费用为12.0万元,静态投资回收期为7.2年。     

燃气热泵空调技术在重庆的应用分析

介绍了燃气热泵空调的技术原理以及技术特点,并根据重庆地区的气候特点和城市能源现状,分析了燃气热泵空调技术在重庆地区的应用可行性.最后以重庆某办公楼为例,分析了在重庆地区采用燃气热泵空调的运行经济性,对比分析结果表明：该工程采用冷水机组＋燃气锅炉的冷热源方案时,每平米年运行费用为21.78元;采用燃气热泵的冷热源方案时,每平米年运行费用为11.58元,相比冷水机组＋燃气锅炉的方案,可以节约接近一半的运行费用,经济效益明显.     

夏热冬冷地区居住建筑冷热源经济性分析

采用改进的温频法进行负荷计算,针对夏热冬冷地区某居住建筑的冷热源方案进行全寿命周期经济性分析。结果表明,采用地源热泵方案经济性最好,比空气源热泵节省费用约7.5%,比冷水机组加燃气锅炉方案节省费用约21.2%。同时,输配能耗占总能耗比重约20%,应优化设计输配系统,降低输配能耗。采用地源热泵方案时,如能采用与冷却塔的复合运行模式,其运行能耗将进一步降低。     

某大楼空调冷热源方案比较

综合考虑地域特征、项目特性,使用特性和社会效益,通过比较冷机组,燃气锅炉、溴化锂体化直燃机等多种冷热源方案的初投资和运行费用,得出最佳的冷热源方案。     

夏热冬暖地区酒店建筑土壤源热泵系统的节能性分析

以南宁市某五星级酒店为例,通过对该项目集中空调和热水系统不同冷热源方案的比较,根据实际情况及相关文献的研究数据,分析不同冷热源方案的运行费用及初投资,计算土壤源热泵系统相对传统系统的节能率,提出夏热冬暖地区采用集中空调和热水系统的酒店建筑应优先采用的技术,给出土壤源热泵系统的适用条件。     

热交换器的分类及优缺点分析

热交换器是将不同温度介质之间的热量通过热传导的形式,由高温介质传递给低温介质,使介质达到生产所需温度的工艺设备,也可作为一种节能设备使用.通过对不同热交换器的结构分析,总结不同热交换器的优缺点、适用环境,为生产工艺设计人员及设备制造单位在选择可降低能耗、提高效率的设备上提供参考.     

聚苯胺及其复合物的制备和结构及形貌分析

通过化学氧化法分别制备盐酸,盐酸和十二烷基苯磺酸,碳纳米管(MWNTs-COOH)掺杂的聚苯胺,利用红外光谱,紫外光谱,扫描电子显微镜和透射电子显微镜对所制备聚苯胺的结构和形貌进行分析。分析不同掺杂物对聚苯胺的结构和形貌的影响;同时研究了超声波作用对聚苯胺形貌以及聚苯胺包裹MWNTs-COOH情况的影响。     

Modelling and computation of curing and damage of thermosets

The curing of thermosets is a complex process involving the transition from a fluid into a (visco-) elastic solid. This phase transition comes along with an increase in stiffness and a volume shrinkage of the polymer. The latter may lead to severe residual strains and stresses, which in turn can cause damage in the final, usually quasi-brittle material. In this contribution a constitutive model is developed which takes into account the curing of a thermosetting material together with the process-induced damage as resulting from curing shrinkage. The curing of the material is governed by a phenomenological hypoelastic constitutive equation which includes temporal evolutions for stiffness and volume shrinkage. Thermal and viscous effects are neglected in the present study. An isotropic gradient-enhanced damage model is adapted to describe the damage evolution. The curing-damage model is implemented into a finite element code and numerical examples for thermosetting materials demonstrate that the proposed model is capable to predict cure-induced damage in thermosets.     

Thermodynamic similarity and prediction of the properties and characteristics of substances and processes

Principles of the theory of thermodynamic similarity are considered in application to all aggregate states of a substance, including phase transitions, and to the change in dissipative structures in open systems.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 53, No. 5, pp. 709–716, November, 1987.     

Mechanisms of Corosion and Oxidation of Metals and Alloys

Selected topics in field of the study of the mechanisms of corrosion and of oxidation of metals or alloys are presented. The first part reports a new model for the mechanism of the breakaway oxidation of ferritic stainless steels in water vapour. The second part is devoted to the physico‐chemical aspects of oxidation and presents experimental methods useful in the kinetic modelling applied to two alloys, the zircalloy‐4 and an AlMg5 % in the liquid state. In the third part the physical and numerical modelling of the stress corrosion cracking behaviour in face‐centered cubic (fcc) alloys is detailed, which enables the study of the influence of macroscopic parameters (such as the temperature or hydrogen activity) on the fracture process.     

碳化硼陶瓷增韧补强和致密化研究现状及其展望

碳化硼陶瓷具有极高的硬度,然而其低韧性、低抗弯强度、难以致密化限制了它的广泛应用.已有一些研究集中于碳化硼陶瓷增韧补强和致密化,对这一方面国内外研究进展进行了归纳与评述,阐明各种增韧补强和致密化方法的优缺点,提出碳化硼陶瓷增韧补强和致密化研究值得发展的一些方向.     

Measurement and analysis of elastic and anelastic properties of alumina and silicon carbide

Measurements of dynamic Young's modulus, E, and damping as a function of temperature, T, were made for alumina and silicon carbide. The Young's modulus data were compared with some from the literature, and analysed in terms of a theoretical framework relating the Debye temperature, θD, with the elastic constants. For both materials this analysis yielded a ratio T₀/θ_D which was near 0.4, where T₀ is an empirical fitting constant for the plot of (E(0)−E)/T versus 1/T (E(0) is the value of E at 0 K). The analysis of the damping data in terms of an Arrhenius type dependence led to effective activation energies near kT, where k is Boltzmann's constant. This revised version was published online in November 2006 with corrections to the Cover Date.     

Preparation and characterization of phosphate and arsenate apatites of strontium and their solid solutions

Samples of phosphate and arsenate apatites of strontium and six of their solid solutions, spread over the entire compositional range, were prepared by a wet method. They were characterized by chemical, X-ray, electron microscopic and infrared analyses. The validity of Vegard's law established the homogeneity of the solid solutions.     

检定和校准证书的异同与应用

本文介绍了检定和校准以及证书的两点相同、五点不同之处,说明了对检定证书和校准证书的正确应用。