Night cooling of building is considered as a technology with a high potential of impact on air conditioning energy needs. Natural ventilation should be the first option for night cooling, for obvious reasons of energy...Night cooling of building is considered as a technology with a high potential of impact on air conditioning energy needs. Natural ventilation should be the first option for night cooling, for obvious reasons of energy savings. The evaluation of the capacity of the building to cool down its structures during night ventilation is of primary concern during preliminary design stage, even though night cooling with natural ventilation is among the most complex problem to be modelled in details. Some modelling options are available, assuming different simplifications in space and time. Among them, virtual sphere modelling has been proposed in the past as a quick way to perform dynamic simulation of the night cooling of buildings. In this paper, the theoretical origin of the virtual sphere model is recalled, underlining its limits in case of application to buoyancy driven night cooling of buildings. The limits can explain the disagreements of virtual sphere prediction with other methods reported in literature and may stimulate a more conscious application of the model and further improvements of the method.展开更多
随着计算机技术的飞速发展,高校信息化建设也在不断推进。VMware v Sphere为我们实现数据中心虚拟化提供了一个可靠的工具,它可以帮助我们实现服务器、网络、存储和桌面的虚拟化,还能智能地控制资源平衡。本文以VMware v Sphere虚拟化...随着计算机技术的飞速发展,高校信息化建设也在不断推进。VMware v Sphere为我们实现数据中心虚拟化提供了一个可靠的工具,它可以帮助我们实现服务器、网络、存储和桌面的虚拟化,还能智能地控制资源平衡。本文以VMware v Sphere虚拟化架构为基础,介绍了虚拟化的概念、类型和技术优势。展开更多
Concepts for a virtual 3D space and a hyper-sphere are proposed and the formulae for determining the computable nodes of the mesh are derived.Then a new optimization design method('Virtual Mesh Method'or V.M.M...Concepts for a virtual 3D space and a hyper-sphere are proposed and the formulae for determining the computable nodes of the mesh are derived.Then a new optimization design method('Virtual Mesh Method'or V.M.M)is developed.Three examples are given,showing that the method proposed is especially suitable for the optimized design of complex structures,and that the global approximate optimal solution can be searched with remarkably reduced computational work.展开更多
在分析当前数字海洋三维可视化关键技术及发展的基础上,深入研究Open Scene Graph(OSG)三维可视化引擎的仿真平台构建及渲染机制,建立合理、高效的海洋环境虚拟仿真和可视化模型,建立基于OSG的三维球体可视化框架体系,并初步设计和实现...在分析当前数字海洋三维可视化关键技术及发展的基础上,深入研究Open Scene Graph(OSG)三维可视化引擎的仿真平台构建及渲染机制,建立合理、高效的海洋环境虚拟仿真和可视化模型,建立基于OSG的三维球体可视化框架体系,并初步设计和实现了一个海洋环境虚拟仿真平台。展开更多
文摘Night cooling of building is considered as a technology with a high potential of impact on air conditioning energy needs. Natural ventilation should be the first option for night cooling, for obvious reasons of energy savings. The evaluation of the capacity of the building to cool down its structures during night ventilation is of primary concern during preliminary design stage, even though night cooling with natural ventilation is among the most complex problem to be modelled in details. Some modelling options are available, assuming different simplifications in space and time. Among them, virtual sphere modelling has been proposed in the past as a quick way to perform dynamic simulation of the night cooling of buildings. In this paper, the theoretical origin of the virtual sphere model is recalled, underlining its limits in case of application to buoyancy driven night cooling of buildings. The limits can explain the disagreements of virtual sphere prediction with other methods reported in literature and may stimulate a more conscious application of the model and further improvements of the method.
基金Project supported by the Natural Science Foundation of Henan Province,China(No.0311010400).
文摘Concepts for a virtual 3D space and a hyper-sphere are proposed and the formulae for determining the computable nodes of the mesh are derived.Then a new optimization design method('Virtual Mesh Method'or V.M.M)is developed.Three examples are given,showing that the method proposed is especially suitable for the optimized design of complex structures,and that the global approximate optimal solution can be searched with remarkably reduced computational work.
