共查询到18条相似文献,搜索用时 93 毫秒
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上世纪八、九十年代,我国从欧美引进许多现代化温室。同时也模仿国外的温室,建造了不少国产的现代化温室。虽然这些温室看起来档次很高,但由于不太符合我国国情,不仅建造运行成本高,而且维修困难、不抗强台风,最终废弃不用或勉强使用。 相似文献
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不同建筑热工分区办公建筑外围护结构负荷指标影响因素权重 总被引:3,自引:0,他引:3
为研究多因素对不同热工分区办公建筑总负荷指标的综合影响,在分析了单一因素对建筑总负荷指标影响规律的基础上,采用层次分析法对分别位于哈尔滨、兰州、重庆、广州的办公建筑负荷指标进行了评价。得到了窗户传热系数Kw、玻璃遮阳系数Sc、窗墙比R在不同热工分区办公建筑总负荷指标影响因素中的权重值,并对此进行了一致性检验。结果表明:对于严寒地区的哈尔滨和寒冷地区的兰州节能建筑,各因素重要程度为R > Kw > Sc;对于夏热冬冷地区的重庆和夏热冬暖地区的广州节能建筑,各因素重要程度为Sc > R > Kw。在建筑结构优化设计中应根据各热工分区负荷影响因素的比重不同进行优先控制相应因素。 相似文献
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葡萄适应性强,在我国南北各地均有栽培,但以北方为主.近年来,受市场拉动影响,南方葡萄也发展较快,但由于气候差异较大,一些农户将在北方表现很好的葡萄品种引至南方种植,却发现病害严重,有的品种根本无法利用. 相似文献
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小麦在输送入仓的过程中,麦秸、麦壳等轻型杂质浮在粮流表面,使用自行研制的麦秸清理机,可使轻型杂质与粮食分离,有效降低了粮食杂质含量。该设备造价仅为千余元,电耗为其它大型清理设备的1/6~1/15,使用一台可降低杂质含量近0.2%。 相似文献
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根据南方牡丹生长的自然气候环境和牡丹的生态习性,在南方栽培牡丹首先要解决的就是防湿问题。这是能否养好牡丹的关键。牡丹的南北之分,可以黄河,长江为基本地域界限,即黄河流域及其以北栽培的牡丹为北方牡丹;长江流域及其以南栽培的为南方牡丹,我国古今著名的牡丹栽培之地,北方以洛阳、长安、陈州、曹州(菏泽)、兰州、延安、北京等为最;南方以天彭(彭州)、成都、杭州、亳州、铜陵、宁国、法华等为最。牡丹最主要的生态特征是喜燥恶湿。即喜欢地势高燥,最怕地势低洼潮湿,这是由于野生牡丹原种长期适应原产地的自然环境的结果。从中国野生牡丹原种分布看,主要在西南的高山区和西北、华中及东北的山区,这些分布地总的来说是气候干燥寒冷;而且它选择生长的地形多为坡地林区灌木丛,因而形成了 相似文献
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The impact of windows to wall ratio and thermodynamic performance of windows on the insulating layer thickness cannot be neglected in existent residential building energy-saving renovation because of the bigger difference of windows to wall ratio. The limited equivalent coefficient of envelope heat transfer was posed based on “Design standard for energy efficiency of residential buildings in severe cold and cold zones”. Factors of orientation, windows to wall ratio and windows types should be comprehensively considered in building calculation model of thermal insulation thickness of external wall and envelope thermodynamic performance optimization model. These models are validated by an existing residential building in Xuzhou. 相似文献
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The building energy consumption is one of the major problems concerned by all the countries in the world. In the integral building systems,the consumption of the HVAV systems is more than 35 percent of the total building consumption. So it is important to study the strategies of energy_saving for air_conditioning systems. This paper explains some efficient and energy_saving HVAC systems, such as ice_storage air_conditioning system and underfloor air_conditioning system,and presents the strategies to accomplish the energy_saving purpose by using materials of energy_saving for enclosure structure and proper control systems. Some problems on the conservation of design and the difficulties in practical operation of energy_saving air_conditioning systems in exiting are discussed. 相似文献
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The indoor thermal conditions of residential buildings during the plum rain season in East China (Nanjing for example) were obtained and the accuracy of three different building energy consumption models (whole building heat, air and moisture model HAM, conduction transfer function model CTF, effective moisture penetration depth model EMPD) were analyzed. The numerical model was implemented into Matlab-Simulink and was validated using measured data from a field survey. Then the validated model was used for simulation analysis using typical weather data of plum rain season.The results from the survey showing the indoor temperature was higher than 28℃ and the indoor relative humidity was higher than 70% in most time of the plum rain season of 2013. Simulation results showed that there was not much difference when using the three models for thermal simulations, however, using CTF model for moisture simulation would result in large inaccuracy. During the plum rain season in Southeast China, when the room ventilation rate is less than 2 ACH, the moisture buffering effect of building envelope is obvious and the choice of proper hygroscopic materials can save up to 30% of building energy consumption. 相似文献
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刚性陶瓷瓦热防护系统概率设计分析方法 总被引:2,自引:0,他引:2
针对高超声速飞行器中广泛应用的陶瓷瓦热防护系统,结合有限元法和蒙特卡洛模拟建立了其概率热分析系统,提出了刚性陶瓷瓦热防护系统尺寸概率设计方法。建立了刚性陶瓷瓦热防护系统的二维有限元模型,考虑了热传导系数、比热容和表面辐射率等材料属性参数以及热防护系统各层厚度的不确定性,得到系统温度场的概率分布特性和系统热防护性能对各参数的灵敏度,并对系统的热可靠性进行了评估。算例表明:文中提出的方法对热防护系统设计过程中合理确定陶瓷瓦厚度和在保证系统性能的前提下有效减轻重量具有指导价值。 相似文献
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Thermal environment is analyzed based on the field measurements of indoor and outdoor temperature and humidity of a typical Tibetan traditional dwelling in a village of Gannan Tibetan Autonomous Prefecture, Gansu province in winter and summer. Results show that the combination of local factors such as history, geography, climate, unique local-style dwelling houses building structure and monomer structure. The structure (envelope)of traditional Tibetan dwelling has a good thermal performance. Passive methods should be used to build thermal environment constructions. Further improvement for indoor thermal comfort conditions through comprehensive and energy-saving heating are needed. 相似文献
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