Applied Mechanics and Materials Vols. 368-370

Abstract: The mathematical model to determine the main parameters of the solar street lamp has been built. The structure and the main parameters of the solar street lamp were analyzed in the paper. The yearly average optimal tilted angle for the solar cell module used in Qujing is approximately 23.75^o. For a 60 W high brightness DC LED lamp, the area of the solar cell and the battery capacity to meet the energy consumption of the solar street lamp are 3.67 m² and 2.89 MJ, respectively.

Abstract: Optimization design of building envelope-integrated collectors plays an important role in reducing energy consumption and improving thermal comfort. Take a passive solar house for an example, optimization design principles for passive solar house were proposed by simulation. Simulation results by changing envelope insulation thickness showed that the optimal thickness was between 30mm and 70mm for south wall, and 70mm~150mm for other façade, respectively. Meanwhile, the optimal thickness for concrete exterior walls was in the range of 200mm~300mm. Simulation of changing heat capacity proportion showed that the daily temperature difference decreased by 14oC to 5.2oC as the proportion increased doubled. However, considering the building initial investment, the arrangement of thermal mass should be determined by the building type and energy demand.

Abstract: In recent years, Chinese Government adopts series of policies and actions to advance the building application of the renewable energy resources. Based on the policies for demonstration projects of application of renewable energy sources to buildings (ARESB) in China, this article discusses the policy systems for the demonstration projects in all aspects, including application and review systems, supervision and administration systems, inspection and assessment systems, and the whole policy systems are based on promoting the advance techniques, practicalities, reasonable economy, demonstration and generalization meaning of ARESB. Based on the actual construction and operation of the demonstration projects, the article also analyzes and evaluates the implementation effects and suitability in different areas concerning each technical type, and then analyzes and evaluates issues existing in the implementation of the policies for the demonstration projects of ARESB, with further policy suggestions provided.

Abstract: An accurate forecasting method for power generation of the solar photovoltaic (PV) system can help the power systems operator to reduce the risk of unreliability of electricity supply. This paper proposed a radial basis function (RBF) neural network method to forecast the power generation of PV system. To demonstrate the effectiveness of the proposed method, the method is tested on the practical information of power generation of a PV system. The good agreements between the realistic values and forecasting values are obtained; the numerical results show that the proposed forecasting method is accurate and reliable.

Abstract: Real-time data acquired by real-time detection system -Sunny Sensor Box-for Donghua University power generating system is utilized, and the mathematical model of the PV array for engineering is optimized by considering the effect of the wind speed upon the module temperature. Furthermore, the optimized model has been proved with higher accuracy.

Abstract: The study of empirical research in the field test, the roof by sunlight exposed control area of the roof panels, roof test area, scaffolding pilot area, vegetation area of the facade, radiation heat absorption temperature change monitoring, explore the roof surface heat transfer temperature difference change.In this study, set the empirical plane pilot area planting the groove (long 425cm × width 300cm × Height 20cm ) in the Taichung City Shenkang residential area on the second floor roof, planting the groove bottom up sequence laying frame high-rise, water proof layer, drainage layer,filter layer (non-woven, water-pottery -stone), the medium layer and planting of layer, planting the groove around the hollow brick interval income side to lighten the load; scaffolding pilot area elevated 60cm ,facade vegetation zone.12:00 temperature change, display the extensive green roof indeed can significantly reduce the building's roof floor surface temperature 8.5-14.2°C, 1-5 months of highest temperature can even cooling up to 17.2-26.2°C, thereby regulating the indoor temperature of carbon reduction effect; extensive green roof during the day at noon in winter and spring period can indeed achieve the cooling effectiveness. The temperature change the extensive green roof on 24:00 pm indeed can save the radiant heat energy to raise the roof of the building, the floor surface temperature of 0.4-2.1 °C, thus achieving the effect of insulation; 1-5 months of minimum temperature can even warming up to 1.9-4.1°C; the extensive green roof winter and spring night time can really achieve the insulation effectiveness.

Abstract: Taking three existing buildings implemented energy saving refurbishment as object for the study, the analysis are carried out in order to obtain the structure characteristics of the existing building.Thermal defects of wall,roof,windows and other building sites are determinated.The overall reform program is formulated. The results provide the basis for reconstruction design project. It proposes systematic technical solutions of exterior wall insulation, roof insulation, insulation of exterior windows, stairwell insulation and energy-saving technical solutions in corresponding key nodes. The design scheme can provide reference for other similar buildings energy-saving renovation.

Abstract: Building energy efficiency testing is an important way to verify whether buildings have measured up to energy efficiency design criteria. On the basis of current state of energy efficient building and construction in regions that are hot in summer and cold in winter, this paper makes an attempt at the analysis of key factors of residential building energy efficiency tests, and focuses on the technical points of field testing on heat transfer coefficient, thermal bridge, thermal defect of residential building envelope as well as room air tightness.

Abstract: At present, in China, shallow geothermal energy has been widely used in energy efficiency of building, but the question of policy mechanisms reduce the rate of new energy promotion.This paper compares the differences between the domestic and foreign shallow geothermal energy policy through the comparison gets the revelation of shallow geothermal energy policy, and combines with the development situation and utilization goal, in the end gives the recommendations for policy system of shallow geothermal.

Abstract: The Paper, based on the theory of technical and economic assessment, puts forward to make financial assessment (on net present value, payback time, risk-benefit ratio, etc.) as the economic control index in accordance with the ideology of entire life cycle during the energy-saving reconstruction of public buildings. Then the Paper makes analysis on cost-benefit ratio of energy-saving reconstruction measures taken on various parts and equipment of outer protective structure, finds out approaches to energy-saving reconstruction with high efficiency, and finally adopts the method of sensitivity analysis on individual energy-saving reconstruction measures to further optimize reconstruction plan, thus improving economic benefits of energy saving.