蓄冷板冷藏车的特点与制冷量计算

讨论了蓄冷板冷藏车的构成特点与制冷原理,介绍了蓄冷板及蓄冷制冷机组的制冷量计算方法。     

基于反光蓄光理念的辅助隧道节能照明理论与技术

文章通过对国内外现行照明质量标准和照明评价方法的研究分析,以及对现有照明光源、隧道内装材料和西南山区隧道照明技术现状的调研,开展了基于反光蓄光理念的隧道室内模拟试验、实体隧道试验和现场试验等一系列隧道照明节能试验,对隧道节能照明规律进行了探讨。研究表明:(1)隧道侧壁采用反光蓄光材料可提高路面照明质量,当墙面反射率达到70%时路面照度至少可以提高10%,为隧道节能照明开辟了新的途径;(2)结合等效照明理念,利用光反射作用降低照明系统的负荷,引入人眼视觉功效作为隧道内行车安全的评价指标,对完善照明评价方法提供了依据;(3)系统研究了反光材料与常用光源的匹配问题,评价了反光材料隧道照明环境下的使用性能,为反光蓄光材料在隧道照明领域的进一步推广应用提供了基础。     

Flow Past an Accumulator Unit of an Underwater Energy Storage System:Three Touching Balloons in a Floral Configuration

An LES simulation of flow over an accumulator unit of an underwater compressed air energy storage facility was conducted. The accumulator unit consists of three touching underwater balloons arranged in a floral configuration. The structure of the flow was examined via three dimensional iso surfaces of the Q criterion. Vortical cores were observed on the leeward surface of the balloons. The swirling tube flows generated by these vortical cores were depicted through three dimensional path lines. The flow dynamics were visualized via time series snapshots of two dimensional vorticity contours perpendicular to the flow direction; revealing the turbulent swinging motions of the aforementioned shedding-swirling tube flows. The time history of the hydrodynamic loading was presented in terms of lift and drag coefficients. Drag coefficient of each individual balloon in the floral configuration was smaller than that of a single balloon. It was found that the total drag coefficient of the floral unit of three touching balloons, i.e. summation of the drag coefficients of the balloons, is not too much larger than that of a single balloon whereas it provides three times the storage capacity. In addition to its practical significance in designing appropriate foundation and supports, the instantaneous hydrodynamic loading was used to determine the frequency of the turbulent swirling-swinging motions of the shedding vortex tubes; the Strouhal number was found to be larger than that of a single sphere at the same Reynolds number.     

蓄冷技术

蓄冷技术是一项合理利用电网资源的制冷节能新技术,通常蓄冷系统避开日间用电高峰,在夜间制冷,白天利用冷能,在节能上具有巨大潜力。     

免维护电瓶的使用与维护

这次的事故给杨先生上了一课,于是他利用业余时间找了点有关电瓶的资料来学习。知道轿车电瓶一般分为普通电瓶和免维护电瓶两类,它们的外观很好区别。普通电瓶上面有六个可以拧下来的塑料密封盖,免维护电瓶上面则没有。原来自己车上的是免维护电瓶,它有啥特点呢？平时使用和维护要注意那些事项呢？下面就让我一一道来。     

蓄电池组开路的原因分析及防范措施

例证了牵引供变电系统二次设备蓄电池组开路的严重危害性，并分析其开路原因，提出了有效防范措施。     

冰及HCFC-141b气体水合物蓄冷性能研究

在一台可视化蓄冷槽(容积为O.16m^3)的蓄冷实验系统上进行了冰和HCFC一141b水合物蓄冷实验研究．结果表明：HCFC-141b水合物主要在盘管的问隙中生长，具有非贴壁生长现象；在实验条件下冰的蓄冷量为HCFC-141b水合物蓄冷量的1．59～2．10倍。但HCFC-141b水合物蓄冷速率达6666.7kJ／h。是冰蓄冷速率的1.62倍．表面活性剂SDS对增加水合物蓄冷量的作用明显，比没有添加SDS时水合物蓄冷量增加约32％。同时对蓄冷速率也有提高．