共查询到19条相似文献，搜索用时 968 毫秒
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《实验室研究与探索》2015,(5):31-35
通过测试屋顶全开启型与屋顶通风窗型两种Venlo式温室在不同设定条件下的温度变化,建立两种温室室内与室外白天温度变化曲线;结合两种温室自然通风条件下通风比变化与强制降温条件下湿帘风机运行状态,进行屋顶全开启型Venlo式温室降温效果的分析。在自然通风降温条件,晴天时屋顶全开启型温室比屋顶通风窗型温室降温更迅速,室温更低,更接近设定温度;阴天时差异不明显,屋顶全开启型温室1 d中室内最高温度高于室外温度0~2.35℃,低于屋顶通风窗型温室1 d中最高温度0~5.25℃;在强制降温开启的条件下,屋顶全开启型温室湿帘风机启动迟,停止早,湿帘风机运行时间要比屋顶通风窗开窗型温室运行时间少1.5 h,能够在不影响降温效果的情况下减少温室降温能耗。屋顶全开启型Venlo式温室大幅增加了温室的开窗通风比,显著提高了Venlo式温室自然通风的降温效果,并减少了温室强制降温的运行成本。 相似文献
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《河南职业技术师范学院学报(职业教育版)》2017,(2)
以位于夏热冬冷地区的安徽工程大学典型教学楼为研究对象,利用现场实测方式对教学楼室内外热环境构成要素中的温度、相对湿度以及风速进行监测,通过分析测得的数据,提出相应的节能改进措施.结果表明:教学楼室内外温湿度曲线变化趋势一致;室内空气温度最高值出现在南向教室晚上19时左右,为30.8℃;室内空气相对湿度最高值出现在北向教室上午7时左右,为81.9%;北向教室室内通风情况优于南向教室.可通过增设建筑遮阳设施与导风构件、提高门窗隔热性能、增加绿化等几个途径改善室内热环境. 相似文献
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宋忠国 《安徽科技学院学报》2003,17(4):355-357
日光温室的后墙和两端山墙的保温隔热性能,对温室的整体性能影响较大,在日光温室的设计和施工中极其重要。本文针对日光温室的特点,介绍砖砌复合保温墙体的构造和施工方法。 相似文献
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宋忠国 《安徽技术师范学院学报》2003,17(4):355-357
日光温室的后墙和两端山墙的保温隔热性能，对温室的整体性能影响较大，在日光温室的设计和施工中极其重要。本文针对日光温室的特点，介绍砖砌复合保温墙体的构造和施工方法。 相似文献
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太阳房是一种既可取暖发电，又可去湿降温、通风换气的节能环保住宅，其应用领域主要是“民用太阳房”、“学校太阳房”、“办公楼”等，同时还有用来种植蔬菜和花卉的太阳能温室。这种太阳能设施在我国北方地区较多采用。目前，我国太阳能温室面积总计约700万亩，发挥着较好的经济效益。 相似文献
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既有建筑能耗高的主要原因之一是围护结构保温隔热性能差。本文探讨了廊坊市既有建筑围护结构的节能改造方法。 相似文献
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为开发高性能沥青路面热反射涂层,研究了功能填料配比对隔热性能的影响、粘结材料配比对粘结强度的影响以及功能填料掺量对隔热性能和粘结强度的影响,并在此基础上制备热反射涂层,对其耐久性能进行评价。结果表明：不同TiO2和SiO2质量比例下,随着TiO2质量的增加,热反射涂层的隔热性能升高。相同固化剂掺量下,在增韧剂掺量为20%～30%时,粘结强度最大;相同增韧剂掺量下,当固化剂掺量为30%～40%时,粘结强度最大。随着功能填料掺量的增加,热反射涂层隔热性能升高,粘结强度先缓慢降低,后加速降低。根据各组分最佳配比制备热反射涂层,涂层磨耗率随磨耗次数的增加而升高,前期升高速率快;隔热性能随磨耗率的增大而线性减小;抗滑性能随磨耗次数的增加先迅速上升后缓慢下降。 相似文献
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INTRODUCTION The use of plastic greenhouses is rapidly ex-panding in China with multi-span greenhouses being the most common type. For all these greenhouses, ventilation performance is a major factor in produc-tion, influencing both climatic control and yield quality over much of the year. Natural ventilation uses very little external energy as compared with forced ventilation, but it increases the complexity ofgreenhouse structures and makes climate control more difficult. Natural venti… 相似文献
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In this study, we present a thermal optimization method using the overall lumped parameter (LP) and partial computational fluid dynamics (CFD) modeling for a 600-kW permanent magnet traction motor developed for high-speed trains. The motor is totally enclosed forced ventilated to achieve high power density, high efficiency, and low maintenance requirements. Considering the electro-magnetic performance, bogie space, and thermal capacity, we propose a ventilation structure with zigzag plates in sector cross-section. We focus particularly on the ventilation channels and propose an overall LP model for thermal optimization, in which the full consideration of the influence of turbulent flow is given by using a partial CFD model. Given the specific critical parameters from the optimization results, we present a complete 3D CFD model of the whole motor to obtain an accurate temperature distribution and the maximum temperature rises in local points. The benefit of zigzag plates is studied extensively using both the LP and the complete CFD models and the results are verified by equivalent thermal experiments under rated operations. Experimental results indicate that the ventilation structure fulfills the normal operational demands of high-speed trains by improving thermal performance by more than 15%. Additionally, we propose an engineering method to estimate iron loss constraint with the complete CFD model to guide the control system design. 相似文献
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Internal temperature is crucial to plant growth in the greenhouse. We investigated the patterns of constructing and managing greenhouses in Chongqing, and developed an algorithm of heating temperature for closed winter plastic greenhouses under the conditions of no man-made illumination, no ventilation and hot wind machine as the heating equipment which are the most adopted pattern of greenhouses in Chongqing area. The algorithm includes two functions of temperature outside the greenhouse, which calculate the values of the warming estimation coefficient （WEC） and the gap between temperatures inside and outside the greenhouse with the measured data of outside temperature, and then give the value of internal temperature; the heat rating of heating facilities required by a greenhouse can be determined by this algorithm with given values of floor area and internal temperature, measured outside temperature and calculated WEC. Verification of the algorithm demonstrates a desirable accuracy of estimation. Algorithms of computing heating temperature for greenhouses of different constructing and managing patterns and in different geographic conditions can also be derived in a similar way. This research presents a paradigm for developing a feasible method to fit out greenhouses with appropriate heating facilities, aiming at energy efficient and cost efficient production. 相似文献
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Internal temperature is crucial to plant growth in the greenhouse. We investigated the patterns of constructing and managing greenhouses in Chongqing, and developed an algorithm of heating temperature for closed winter plastic greenhouses under the conditions of no man-made illumination, no ventilation and hot wind machine as the heating equipment, which are the most adopted pattern of greenhouses in Chongqing area. The algorithm includes two functions of temperature outside the greenhouse, which calculate the values of the warming estimation coefficient (WEC) and the gap between temperatures inside and outside the greenhouse with the measured data of outside temperature, and then give the value of internal temperature; the heat rating of heating facilities required by a greenhouse can be determined by this algorithm with given values of floor area and internal temperature, measured outside temperature and calculated WEC. Verification of the algorithm demonstrates a desirable accuracy of estimation. Algorithms of computing heating temperature for greenhouses of different constructing and managing patterns and in different geographic conditions can also be derived in a similar way. This research presents a paradigm for developing a feasible method to fit out greenhouses with appropriate heating facilities, aiming at energy efficient and cost efficient production. 相似文献
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STP板具有保温隔热原理简单、性价比高、防火性能好、施工工艺简单、适用范围广泛等优点,使用STP板能在保证外墙保温性能的前提下,提高外墙保温系统的防火安全性能,有效降低火灾发生概率,是目前世界上先进的高效不燃型建筑保温材料。 相似文献
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张璐 《黎明职业大学学报》2014,(2):75-79
结合闽南沿海地区的气候环境,探讨闽南沿海地区绿色农村住宅在建筑选址布局、建筑造型、围护结构节能技术、可再生能源利用和雨水回收利用5个方面的技术措施,提出闽南沿海地区绿色农村住宅的适宜设计技术。研究表明:闽南沿海地区绿色农村住宅可通过居住区的绿化,行列式的建筑群布局,合理的建筑遮阳和自然通风采光设计,外墙自保温隔热设计,外窗和屋顶的隔热设计以及风光互补发电系统的开发和屋面雨水回收利用设计来实现节地、节能、节水、节材的设计目标。 相似文献
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目前,建筑节能化是大势所趋,在建筑外墙保温我国在建筑节能方面已投入了相当的人力、财力和物力资源,并已取得了一定的成绩,但工作主要限于建筑节能技术和建筑节能政策方面,对于建筑施工阶段的质量管理和控制仍关注不足,重点阐述了节能建筑外墙外保温的施工过程,提出相应的技术措施和建议. 相似文献
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为了适应21世纪建筑节能的要求，我们研制开发出了粉煤灰聚苯乙烯颗粒保温隔热材料，本主要以当前最先进的LCA评价方法，对粉煤灰聚苯乙烯颗粒保温隔热材料的环境协调性、经济性和功能性进行了定性分析，判定粉煤灰聚苯乙烯颗粒保温隔热材料为环境材料。 相似文献