Indoor Temperature of Green Roof in Heat Transfer Critical State

Based on the existing experiment, the heat flux characteristics of green roof in passive indoor thermal environment and thermal parameter suitable for evaluation of the thermal performance of green roof were analyzed. It is found that there is indoor critical temperature in acceptable indoor thermal environment range for green roof, in which there is no heat transfer from roof. Through the correlation analysis of internal surface heat flux of roof and the temperature difference between indoor and outdoor, it is shown that the indoor critical temperature is 1.5℃ lower than air temperature outside for green roof.     

Study on Cooling Technique of Roof Using Porous-MoistMaterial Cover by Passive Solar Evaporation

The thesis studies the cooling method using the porous-moist material covering on exterior surface by the passive solar evaporation.The mathematical Model for the process of heat and moisture transfer based on the moist-porous material under passive solar vaporization cooling is established. Through theoretical analysis.computer simulation and test measurement in situ, all results show the law of the thermal process. It is said that this method is feasible.     

Adaptability Analysis of Passive Building Energy Efficiency Technology in Selected Climatic Regions

Passive building energy efficiency refers to utilizing ecological building design principles with natural climate resources to realize building energy efficiency, which is greener, more conducive to the sustainable development of the human living environment, and will actively advocate building energy efficiency. The adaptability of six passive building energy efficiency technologies including passive solar heating, natural ventilation, thermal storage wall, induced and night ventilation, direct evaporative cooling and indirect evaporative cooling in typical cities in selected climatic regions would be analysed. In addition, the applicability of passive building energy efficiency technologies in selected climatic regions would be compared.     

Study on Application of Interrelated Controlling Method for Thermal Environment and Energy Saving in Buildings--Application in Determining the Control Indexes for Heat Insulation and Energy Saving of Enclosure in Bu ildings

In this paper according to the relationships between indoor-outdoor climate parameters, indoor thermal environment parameter and heat insulation parameters of enclosure, the control condition of indoor thermal environment and the control parameters of heat insulation-energy saving are advanced. Prescribing a quality limit for the parameters, the control indexes for the heat insulation energy saving of the enclosure are given.     

Study on the Heat Preservation and Energy Efficiency Design of Exterior Wall of Store Building in Chongqing

In order to research the potential of energy efficiency design of public building in depth, the large scale of store building in urban districts of Chongqing is chosen as the subject. On the basis of investigation into typical department store,an elementary model of department store has been built up. In allusion to exterior wall of department store, in respect of improving heat preservation of exterior wall, four different energy efficiency conformation design projects were made out,such as using double-layer window and adding heat insulation layer to exterior wall etc. and four energy efficiency projects with the actual design of exterior wall were compared;By analyzing the thermal and economic indexes, the most effective project of the energy efficiency design of exterior wall as to store building was found out to provide reference to the energy efficiency design of large scale of public building.     

Study on Thermal Effects of Ponding Roof With Floating Insulators

This paper describes the evolution of ponding roofs, and recommends a kind of ponding roofcovered by floating insulators, which has excellent thermal performance. A new opinion on dynamicthermal decrement is presented, and its main influening factors are analyzed.     

Dynamic Heat Transfer Analysis of a Water Storage Roof

On the basis of analyzing the complicate heat and humid exchange between the outdoor air and the water layer of the roof,the authors obtained a heat transfer model and it's transmit matrix. The temperature and heat flux responses of the internal roof surface is greatly lowered than that of non-water layer roof. It can be concluded that the maintenance of a water layer on the roof is a good way to resist the fluctuation of outdoor temperature and significantly reduce the cooling load of a building.     

The Building and Roof Garden

The roof garden has great functioning of smoothing the shortage of land resource in the city and making use of the land resource diversity and efficiently. It is an efficient and reasonable way to exploit the open space the roof of the building. From the classic roof garden of the world, we can find out that roof garden has close relationship with the building. Roof garden is different with other kind landscape in the city, it needed cooperation of landscape architect and architect from at the stages of design, construction, upholding and management. We should attach importance to roof garden in the construction of building.     

Experimental Study of a Passive Dehumidifying Solar House

On the basis of saving energy, protecting environment, strategy and efficiency, in this paper, the advantage of passive dehumidifying solar house over other traditional dehumidifying systems are expounded. The high humid environment affects not only the thermal comfortableness of indoor people, but also the indoor sanitary condition, human health, indoors electrical equipment and life span of the furniture. This paper presents a passive dehumidifying solar house, the dehumidifying body can be regenerating evaporation by solar energy; new dehumidifying equipment is designed to reduce relative humidity. It is proved that the new dehumidifying body has a very good dehumidifying effect. It will be widely used in some districts.     

8种屋顶绿化木本植物的耐热性比较

筛选适应屋顶特殊环境的木本植物,对于丰富屋顶绿化植物种类、发挥屋顶绿化的生态和美化功能具有重要的现实意义。高温胁迫是植物正常生长发育的限制因子,为了探索屋顶绿化木本植物的耐热性,研究其在屋顶高温环境下的适应能力,笔者以屋顶上生长的白榆、柳树、构树、杠柳、小叶杨、金银木和较适宜屋顶绿化的金叶榆、珍珠梅8种木本植物为试验材料,测定不同梯度热处理条件下叶片相对电导率,配合Forstst2.1统计分析,对8种木本植物耐热性进行了研究,结果表明：叶片经梯度高温处理后,处理温度与细胞伤害率之间呈“S”形曲线。通过Logistic拐点确定半致死温度LT50,由高到低依次为：杠柳65.30℃、金银木63.80℃、小叶杨57.85℃、柳树56.84℃、白榆55.87℃、珍珠梅49.94℃、构树44.81℃、金叶榆43.98℃。8种植物材料中,杠柳、金银木的耐热能力最好,柳树、白榆、小叶杨次之,珍珠梅、构树、金叶榆耐热性较差。     

Wind Power Utilization Efficiency on Roof of Rectangular Buildings

Installing small wind turbines on the roof of buildings is a new way of wind power utilization in recently years. Based on the annual mean wind speed, the efficiency of wind power utilization on roofs of buildings was studied and the evaluation indexes for the utilization efficiency were proposed. With the help of CFD numerical analysis, the analysis on wind power utilization efficiency on flat roofs of rectangular buildings was carried out. The performance indexes of reference points under different windward angles were investigated. The best position and arrangement of wind turbines on the roof were also discussed. Furthermore, the utilization efficiency of four roofs with different shapes were analyzed and compared with that of flat roof.     

Measurement and Analysis of Multi Functional Stadium ofGuangdong College of Pharmacy

Lighting and air conditioning energy consumption of stadium is very large. That how to use natural lighting and natural ventilation is the key pivot for stadium energy efficiency design. A variety of passive energy efficient measures were used in the Multi functional stadium of Guangdong College of Pharmacy, such as lighting windows with vertical blinds in east and west facades, Openable windows on south and north facades, planting roof and etc. It was found that the above mentioned passive designs could 〖JP2〗increase natural illumination of competition venues, prevent the glare, raise wind speed in audience area, improve comfort level and decrease internal surface temperature of affiliated building and reduce heat radiation.     

Experiment and Simulation on Heat Transfer Efficiency of Double pipe Heat Exchanger for River Water source Heat Pump

The river water source heat pump system is an important technique to utilize renewable energy in Chongqing and heat exchanger can influence overall energy efficiency of system obviously. A test was carried out to study the heat transfer efficiency of double pipe heat exchanger with semicircular reentrant tube. It was found that the heat transfer efficiency would increase while curvature of semicircular reentrant tube rose. And when the ratio of R to r was five, heat transfer efficiency for semicircular reentrant tube would be increased 2.5% than that of straight double pipe heat exchanger. Flow, temperature field and heat transfer process of semicircular reentrant tube were simulated with computational fluid dynamics(CFD) tool to study the heat transfer mechanism. The modified RNG κ ε Turbulence Model was adopted to ensure the accuracy of simulation analysis under the situation of rotary flow and great curvature. Thus, it was indicated that there was obvious secondary flow vertex in reentrant tube. And disturbance of vertex on boundary layer was the main reason for which heat transfer efficiency of double pipe heat exchanger would increase as curvature of semi toroidal reentrant tube rose. Based on the experiment and simulation, the recommended curvature for reentrant tube was proposed with the consideration of sediment in river water and heat transfer efficiency of heat exchanger.     

Testing Method and Heat insulating Principle of the Thermal Insulation Coatings for External Wall

Abstract：In the modern society due to the increasingly high requirements on the environment circumstances, it is imperative to study the insulation coating.This paper introduces the testing method and heat insulating principle of the building external wal     

热泵技术在温室中的应用

为了探究热泵技术在农业领域可持续发展的应用前景,通过对热泵的发展概况、工作原理以及在各种温室上的应用展开分析探讨。综述了国内近20年的热泵在温室上的应用,研究表明：热泵在温室的应用上存在着一定的地域局限性和环境局限性,而复合型热泵可以通过相互间的取长补短打破这一局限性。因此今后需要将复合型热泵作为重点研究对象,促使热泵在温室上应用更为广泛。热泵系统作为一种节能、高效、环保的新型节能技术,受到大众的青睐,在农业领域的可持续发展有较好的应用前景。     

Study on the Application of Energy Efficiency Building Design Based on BIM Technology

In light of the current situation of energy efficiency building design in China and the situation of energy analysis tools application both at home and abroad,aiming at the fact that traditional energy efficiency building design methods cannot meet current needs,this paper puts forward a new design approach-integrating BIM technology with energy efficiency analysis to carry out energy efficiency building design.The virtual building model created with BIM technology is an electronic database containing all of the building's information.By importing this virtual building model into energy analysis tools,we can automatically identify and analyze the model's great amount of information so as to quickly and easily get the energy efficiency analysis results.     

屋顶绿化木本植物的抗旱性研究

为了筛选出适宜屋顶绿化需要的节水抗旱木本植物,在2010年4-6月,以石家庄市的气候条件为基础,测定自然干旱胁迫条件下16种屋顶绿化木本植物的叶片面积、相对含水量、质膜相对透性、可溶性糖含量等指标,综合分析16种木本植物树种的抗旱性。结果表明,柳树、小叶杨、白榆、杠柳抗旱性最强,推荐用于屋顶绿化;金叶女贞、桑树、紫叶小檗、棣棠、红瑞木、珍珠梅、金银木、臭椿、大叶黄杨的抗旱性中等,通过精细管理也可用于屋顶绿化;金叶榆、构树、火炬的抗旱性弱,建议选用时应加强灌溉措施。     

Effects of Heat Transfer Coefficient of External Window on Residential Buildings in Subtropical Areas

Using Designer's Simulation Toolkit DeST h developed by Tsinghua University, research was carried out on the energy consumption of a typical residential building in Ningbo, P. R. China, with a focus on the heat transfer coefficient of external windows facing every direction. Results show that variation of the heat transfer coefficient of external windows in all directions has a substantial effect on energy consumption for heating but little effect on energy consumption for cooling. It is difficult to decrease cooling energy consumption by decreasing the heat transfer coefficient of external windows in summer. The heat transfer coefficient of external windows facing south has a significant effect on building energy consumption, but the windows facing north have less effect, and those facing east and west have the least impact. Decreasing the heat transfer coefficient of external windows facing north and south from 4.7 to 3.2 produces the most favorable performance cost ratio for energy saving investments. Reasons for the decrease in the heat transfer coefficient of external windows leading to increased air conditioning energy consumption were discussed. The conclusions are useful for guiding energy efficient building design in other subtropical cities.     

缓冲空间对拉萨市居住建筑冬季采暖能耗的影响

冬季现场调研与热环境测试表明,拉萨市现有居住建筑的缓冲空间能明显改善室内热环境。但当地非采暖房间冬季热环境仍较差,居住建筑采暖需求明显。当地采暖能耗与环境负荷增长趋势明显。以拉萨市常见的单元式住宅为基础建立了热工计算模型,模拟分析了南北向缓冲空间进深设计对冬季采暖能耗的影响规律。结果表明：南北向缓冲空间均能有效降低模型的采暖能耗,其中,随着南向缓冲进深增大,模型采暖能耗呈递增趋势;随北向缓冲空间进深增大,模型采暖能耗呈先降后增趋势,北向缓冲空间模型之间能耗差很小。缓冲空间优化设计模型与基础模型的能耗对比分析显示,合理设置的南北向缓冲空间能够大幅降低采暖能耗。