Convective heat transfer in domed skylight cavities

Domed skylights are important architectural design elements that deliver daylight and solar heat into buildings, and connect the building's occupants to the outdoor environment. Despite the widespread use of domed skylights, there is limited information on the convective heat transfer within cavities of multi-glazed domes. This information is required to evaluate the thermal performance of domed skylights for product rating purposes, or to evaluate the heat loss or gain of installed skylights in buildings. This article presents a numerical study on the laminar natural convection in horizontal concentric domed cavities heated from the inside surface. A commercial CFD package is used to solve for the flow and temperature fields. The results show that for large cavity gap spacing-to-radius ratios, the cavity flow is mono-cellular and steady state. For small gap spacing ratios, however, the cavity flow may be multi-cellular and transient periodic. Practical correlations for the heat transfer coefficient as a function of the cavity shape and gap spacing ratio are developed for both flow regimes. The critical gap spacing ratio that yields the maximum Nusselt number is quantified for each cavity shape.     

《农村天然气供气设施运行管理规范》解读

阐述天津市地方标准《农村天然气供气设施运行管理规范》的编制方法和编制特点,解读该标准各章节内容。     

舟山墙体节能现状与建筑节能前景分析

分析了舟山地理位置的气候特点和舟山建筑的节能现状。鉴于目前在舟山墙体节能在现场原材料、施工过程等方面存在的问题,可以考虑利用舟山特殊的地理位置所拥有的自身优势,建筑工程因地制宜进行保温节能,充分利用自然风和可再生资源、合理遮阳、减少人工照明和改善窗户节能等措施改善舟山的建筑节能。     

贵州地区绿色建筑地域适应性技术探讨

绿色建筑的设计应注重地域性,遵循因地制宜的原则。根据贵州地区实际地理、气候、自然资源及经济条件,结合GB50378—2006《绿色建筑评价标准》,分析适合于该地区绿色建筑技术适应性关键技术,以实现最大程度的节约资源。     

天然采光模型在探索性实验中的应用与分析

为了提高学生对节能降耗的认识,掌握采光口的形状、位置与采光系数、采光均匀性之间的规律,共确定36种教室模拟模型,学生自己选择实验内容和实验模型,设计出一套科学的探索性实验方案。通过实验数据对不同采光口与采光系数、采光均匀度之间进行分析比较,得到如下3个结论：从节能方面考虑,建议教室的窗墙比大于1：3．5;从室内照明均匀度方面考虑,建议教室的窗墙比小于1：3．5;从综合性因数方面考虑,教室的窗墙比为1：3．5为最佳状态。     

生态修复背景下园林园艺类博览会 植物景观营建研究

在生态文明建设的大背景下,生态修复已经成为中国园林园艺类博览会的热点亮点,这对植物景观营建提出了新的要求和挑战。通过回顾我国综合性园林园艺类博览会在生态修复方面的探索,结合科学绿化的建设要求,提出生态修复背景下园林园艺类博览会中植物景观营建的目标需要综合生态、城市景观、城市事件的三重要求,遵循问题与目标导向相结合、人工修复和自然恢复相结合、景观塑造和群落营造相结合的工作要点。综合国内外相关植物景观营建实践,探讨在全园规划尺度、展园设计尺度和展后利用方面如何将生态修复和植物景观营建实践相结合,为今后园林园艺类博览会以及更大范围的风景园林生态修复实践提供参考。     

Understanding the New Zealand non-domestic building stock

Unlike the residential building stock, most countries have poor information on their non-domestic stock. This necessitates the use of other data sources. In the mid-1980s the (then) New Zealand Department of Valuation digitized its valuation records. This permitted the first analysis of an entire country's non-domestic buildings. A very long-tail probability density function was identified, with the largest 5% of buildings containing more than 40% of the floor space. This knowledge informed the development of research for understanding non-domestic buildings as well as underpinning the 1996 revision of the NZ Building Code Clause H1 Energy Efficiency. More recently an analysis of valuation data has provided the Building Energy End-use Study (BEES) with a national sampling frame to examine energy and water end-uses in non-domestic buildings. The development of processes for collecting and analyzing data is described. Considerable changes in understanding of valuation data have occurred for documenting the non-domestic building stock. New online and geographic information sources can validate and improve building data. The use of such a database supports improved understanding of the changing nature of the building stock and potential intervention points, as well as harnessing regulatory and market forces.     

深水海底天然气水合物浅覆盖层钻井井壁稳定预测研究

以南海北部神狐海域天然气水合物浅覆盖层钻井井壁稳定为背景,对深水浅覆盖层钻井井壁稳定预测模型,南海沉积物物理、力学参数,以及神狐海域天然气水合物储集地层井壁稳定的研究现状进行分析和总结,探讨深水海底天然气水合物浅覆盖层钻井井壁稳定预测的难点和拟解决的方法,为深水海底天然气水合物浅覆盖层钻井井壁稳定预测提供支持。