夏热冬冷区太阳能转轮除湿空调系统模拟分析

目的以夏热冬冷地区南京市某办公建筑为例,设计一种与土壤源热泵技术相结合的新型太阳能转轮除湿空调系统,以达到舒适并节能环保的要求.方法通过应用TRNSYS软件建立子系统模块,然后建立太阳能转轮除湿空调系统以及常规热泵空调系统仿真模型,对系统各设备能耗、热泵机组性能及太阳能转轮除湿空调系统的重要部件的性能进行模拟;通过太阳能作为再生能源时提供的热量、除湿转轮的除湿量和全热换热器交换的湿量,分析系统运行效果;采用Airpak软件对室内温湿度进行模拟,分析太阳能转轮除湿空调系统实现室内舒适度效果;并对太阳能转轮除湿空调系统及常规热泵空调系统进行经济性及环保性分析.结果太阳能转轮除湿空调系统全年能耗相对常规热泵空调系统节省能耗29. 4%,并且可以通过全热换热器与除湿转轮基本实现对南京地区建筑湿负荷的处理,进而减小热泵制冷能耗.结论太阳能转轮除湿空调系统对环境污染小,节能环保,其应用更具有可行性与长远性.     

吸附式转轮除湿机机组在大型地下人防工程的应用

针对具有平战结合功能,地下建筑要求大量新风,新风湿负荷大、除湿空间分散、冷却水不易排放的特点,采用吸附式转轮除湿系统,结合VBV和新风空调系统,实现空间内温湿度的控制。     

冷却吊顶空调系统的适用性分析

以北京、上海等7个典型城市的模拟建筑为例,分析了新风机组除湿能力对冷却吊顶结露现象的影响,研究了冷却吊顶系统在不同地区的适用场所,结果表明,在北方地区,冷却吊顶空调系统可以应用在室内湿负荷较大的场所,其适用范围比在南方地区应用时更为广泛.     

基于THICS的高湿地区耦合除湿技术理论分析

针对温湿度独立控制空调系统(THICS)的新风除湿部分,结合赣南地区夏季湿度大的气候特点,提出一种适应高湿地区处理空调新风的"冷却+溶液耦合"除湿技术,该技术采用双级喷水实现第Ⅰ级的冷却除湿过程,采用内冷型溶液除湿器实现小温差的第Ⅱ级除湿过程,通过建立除湿过程的热质交换数学模型,确定除湿过程的设计程序,通过对求解结果的分析,认为该除湿技术在高湿地区空调新风系统中的应用是可行的。     

夏热冬冷地区近零能耗住宅室内湿特性分析

以夏热冬冷地区近零能耗住宅和常规住宅为研究对象,计算了夏季和除湿期的除湿量,对比研究了两种建筑的热湿比特征和室内高湿度问题。研究结果表明:近零能耗住宅和常规住宅除湿量变化主要取决于新风和渗透风量,无人时段换气次数对总除湿量影响较小。在不考虑新风显热负荷和湿负荷的情况下,近零能耗住宅夏季和除湿期的热湿比分别降低至常规住宅的45.3%和38.5%。以室内温度为控制参数时,近零能耗住宅在夏季和除湿期的室内高湿度时长比常规住宅长。夏季减小近零能耗住宅无人时段的开窗换气次数,除湿期适当开窗通风有助于减少室内的高湿时数。     

转轮式全热回收器的数学模型与变工况性能分析

建立了转轮式全热回收器的数学模型,与现有文献对比验证了该模型的正确性,并利用此模型研究了迎面风速、新排风比、新风温度(含湿量不变或相对湿度不变)、新风含湿量的变化对转轮热回收效率的影响.结果表明,随迎面风速的增大,转轮的显热效率、潜热效率与全热效率均降低;随排风量与新风量之比增大,或新风温度的升高(相对湿度不变时),转轮的显热效率、潜热效率与全热效率均增大;随新风温度的升高(含湿量不变时),转轮的显热效率增大,潜热效率与全热效率降低;随新风含湿量增大,转轮的显热效率不变,潜热效率与全热效率升高.     

多因素影响下的转轮热湿及VOC耦合吸附特性研究

目的研究不同影响因素下转轮的热湿和挥发性有机化合物(VOC)耦合吸附净化的效果,以期实现同时对室内空气进行净化和除湿.方法建立热湿及VOC耦合吸附数学模型,利用VB编制程序,对转轮热湿及VOC耦合吸附特性及各因素影响规律进行仿真模拟.结果水分脱附的效果随着被吸附空气进口湿度的增大而提升,但是被吸附空气进口湿度的变化对于甲苯的吸附净化和脱附没有影响;被吸附空气进口处的温度越高,对水分和VOC的吸附和再生越有不利影响;在不同的被吸附空气的甲苯质量浓度条件下,甲苯自身的吸附和脱附效果会产生相应的变化;再生空气进口处的湿度有一定程度增大时,水分的脱附会受到一定的影响,不利于空气的除湿.但同样情况下的再生空气,对甲苯的吸附和脱附有明显的促进作用;此外,如果增加再生空气进口处的温度值,对于空气中水分和VOC的吸附和脱附有明显促进作用.结论除湿转轮可以降低室内空气湿度,同时对VOC也有很好的净化能力.转轮热湿及VOC的耦合吸附可以提高室内的空气品质.     

干燥剂转轮动态除湿特性实验研究

利用除湿量D和除湿性能系数DCOP两种评价指标的动态变化,通过实验比较了硅胶和氯化锂转轮在相同工况下到达稳定状态之前的动态除湿特性。研究了运行参数（再生温度,处理风量,处理空气进口温度、湿度）对转轮稳态前动态除湿性能的影响。结果表明,在同种工况下,氯化锂转轮非稳态过渡时间比硅胶转轮要长,氯化锂转轮的D和DCOP都始终高于硅胶转轮;再生温度、处理风量和处理空气进口湿度的影响比较大,处理空气进口温度的影响比较小。     

除湿转轮的数学模型及瞬态响应性能实验

建立了除湿转轮的传热传质模型,模型中考虑了基体材料蓄热对传热传质的影响;搭建了进行变风量运行工况下转轮瞬态响应性能研究的实验台．模拟并实验研究了变风量运行方式下除湿转轮的瞬态响应性能,对转轮数学模型的可靠性进行了验证,对除湿空调系统可节省的显热负荷进行计算．结果表明,处理风速阶跃减小时,处理空气出口相对湿度随时间逐渐减小,温度升高,再生空气温度和相对湿度分别呈小幅上升和减小的趋势,响应时间约1h;风速阶跃增加时,处理空气出口相对湿度随时间增大,温度降低,再生空气温度和相对湿度相应呈小幅下降和增大的趋势,响应时间约40min．计算表明,变风量运行方式可节省除湿空调系统显热负荷约20%,若通过调节再生风速和风温,可进一步节省显热负荷约13％．模拟的瞬态响应曲线与实验曲线较为一致,模拟误差在10％以内．     

温湿度独立调节空调系统预冷型新风机组运行性能分析

直接采用冷却除湿方式对新风进行处理是温湿度独立调节空调系统潜热处理的主要形式。文章通过理论分析和实验测试的方法对预冷型新风机组的性能进行分析。结果显示,新风预冷段变工况运行和定工况运行均能满足温湿度独立控制的新风送风的含湿量要求。针对某办公建筑,当考虑水系统输配能耗时,预冷段变工况模式比定工况运行模式节能5.29%。     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with     

Journal of Donghua University ( English Edition) Contents of Volume 31

正~~