Applied Mechanics and Materials Vols. 209-211

Abstract: This paper develops the material temperature predicting and energy-saving control technique and its specialist-aided system in order to reduce energy consumption on airport jobsite. This technique can predict the changing temperature trend after concrete material pouring and the changing maturity level of concrete, according to the key parameter information that contractors provide. Giving the results the preceding data, it can provide the optimal curing method, thermal insulation and construction technology. This technique helps contractors find optimal solutions to save energy and resources in airport winter construction and avoid the unnecessary energy consumption.

Abstract: with the shortage of the raw material oil for producing bio-diesel in China, the oil, recovered from the used bleaching clay which often be discarded by vegetable oil factory, was used to prepare bio-diesel in this trial. Two-step catalyzed process was adopted to produce biodiesel from the oil. The effect of methanol-to-oil molar ratio, alkaline catalyst quantity, reaction temperature and reaction time on the preesterification and transesterification reaction was investigated through orthogonal experiments. Thus the optimal reaction condition came out. Firstly, the optimal pre-esterification condition, under which the end acid value of the product was minimum (i.e. 1.88 mgKOH/g),was to react for 40 h at 60°C,with a methanol-to-oil molar ratio of 12:1, and by adding alkali catalyst 4% based on the oil weight. Secondly，the optimal transesterification condition, under which the maximum yield of bio-diesel can reach up to 98.2%, was to react for 2.5 h at 60°C,with the methanol-to-oil molar ratio of 7:1, and by adding catalyst 1.25% based on the oil weight.

Abstract: The solar heating and cooling system simulation platform has been established based on Trnsys in this paper. Taken the villa building in cold areas of China as research objects, the solar heating and cooling system with different solar energy resources division have been analyzed. System optimization designs have been proposed and the optimum storage tank volume and solar fraction of the solar heating and cooling system have been given. The results show that the solar irradiation is one of the most influence factors in solar heating and cooling system for storage tank volume and solar fraction. The higher solar irradiation can be acquired, the larger volume of storage tank and solar fraction.

Abstract: Energy consumption of construction in campus occupies a significant portion of quantity of energy consumption of the total society. College students' per capita energy consumption is four times higher than the national average residents. The potential energy-saving is huge. This paper takes Taiyuan university of technology as an example to introduce the structure of energy consumption monitoring platform and system features. The data acquisition and data processing are detail introduced. In addition, the data display system is given in form of graph-chart, users can choose what kind of data you want to see, instant values which uploaded in every five minutes or historic data in hour, day and month.

Abstract: The composite steel structure combines the advantages of steel structures and concrete structures. In order to study the energy-saving behavior of the composite steel structure, a thermal testing on a typical composite steel structure residential in cold region is performed. The energy consumption performances of all components of the residential are evaluated; the heat transfer coefficient K for envelope structure is obtained using the testing data and then the K value is compared with the current specification. The results show that energy-saving standard of the testing residential could not meet the requirements of code. Finally the existing problems and solutions for the composite steel residential buildings are produced.

Abstract: In order to employ the solar energy and bioenergy efficiently and economically, a new model of heating system is established for theoretically studying the exergy and energy utilization of solar energy and bioenergy on the basis of the Integrated Cascaded Utilization of Chemical and Physical Energy Principle. The results indicate, the low temperature floor radiation heating way is better than the traditional radiator heating way, and compared with traditional direct burning biomass heating, the energy and exergy utilization efficiency of the new system are more than 89% and 20% respectively, and the capital recovery period is less than 3 years.

Abstract: Phase separation of the poly(3-hexylthiophene) (P3HT) and [6,6]-phenyl-C61-butyric acid methyl ester(PCBM) active layer (ATL) was investigated by varying their relative ratio in the organic solar cells (OSCs).With the help of the UV/visible spectrophotometer, optical microscopy and scanning electron microscope,we found that the cluster of PCBM at the interface or surface was affected by Al cathode, the composition of the blends and thermal annealing. The disc-like shape crystals of PCBM substituted for the needle-like ones at higher PCBM compositions at the ATL/Al interface, which led to stronger contacts and bigger contact area. It could make short circuit current density increase, but may affect the blend morphology and result in parallel resistance and open circuit voltage decreased with the PCBM ratio increasing from 40 to 60%. The microstructure of the P3HT:PCBM ATL, determined by the composition dependent phase separation, supported the optimized performance of the OSCs with the composition of 40–50% PCBM.

Abstract: This paper emphasize the importance of research of dynamic energy saving control by analyzing the properties of the architecture. From the comparison and analysis of related research, the paper presents the research strategy of dynamic energy saving control in China.

Abstract: Faced the reality of high energy consumption in China’s building sector, it is imperative to research and develop new technologies in China’s building sector vigorously. Undoubtedly, it is mature in building energy saving technology in China. Numbers of appropriate technologies have been developed and applied in China, especially in the utilization of renewable energy. Therefore, this paper summarized four main popular building energy saving technologies, i.e. energy saving technologies of building envelope, energy saving technologies of building services and equipment, utilization of renewable energy and building energy management.

Abstract: With the social progress and the development of the world economy, the contradiction between energy demand and supply is increasingly outstanding，so saving energy is the important task which the human are facing. Solar energy as a renewable clean energy is one of the potential energy applying on buildings. This article analyzes the geometric parameters of the solar air collector and summarizes the baffle types of the solar air collector and puts forward to methods improving the efficiency of solar air collector.