Advanced Materials Research Vols. 512-515

Abstract: In this paper, the main public buildings, Lang fang City, Hebei province, the research summary and statistical power to the city building a sewage treatment plant sewage source heat pump system operating on-site monitoring, the monitoring results of economic analysis with traditional heating methods from the initial investment and operation of both comprehensive economic analysis and comparison.

Abstract: Resource shortage and people’s concern about carbon emissions will greatly influence building energy efficiency. Building energy efficiency is the basis for achieving carbon reduction and it should develop into low-carbon building. After introducing the concept of low-carbon buildings, this paper analyzes the important role technology plays in low-carbon building development and proposes several energy-efficiency measures concerning new building construction, old building transformation and low carbon lifestyle. The paper aims to be of help in promoting the development of low-carbon buildings.

Abstract: This paper describes the CL structural system and its evolutive history. By compared with other materials, the CL structural system has the following characteristics such as to reducing the weight of building, expanding area of the house, saving energy, extending the using life. The paper based on interrelated research, illustrated the application and effect of the CL structure in Qinhuangdao. In the paper, The author also explained the scope of the application of the CL structure and proposed to promote the application.

Abstract: This article on a sewage treatment plant building in Langfang city, Hebei province apply Dest software for energy analysis and energy consumption analysis of the building, results table for further analysis of economic operation provides powerful information.

Abstract: Aiming at the current unreasonable heat charge policy, this paper describes the necessity of consumption-based heat bill system, introduces the basic ideas and problems of household heat metering and central control on total heat supply, and analyzes the relationship of household heat metering and central control. The study shows these two aspects should be well coordinated wit[h each other for better energy savings.

Abstract: Electromechanical coupling coefficient of cement-based piezoelectric composites affected by pozzolanic materials and poling field are investigated. Specimens, through a pressure approach, are manufactured by combining PZT powders and cement-based binder with the same volume fraction. Pozzolanic materials including fly ash, slag and silica fume replace 20% cement in the binder. Three poling fields are considered to induce piezoelectricity of 0-3 cement-based composites. Results show that electromechanical coupling coefficients do not have many fluctuations in terms of material ages for any cement-pozzolanic piezoelectric composites. With the same volumetric substitutes of pozzolanic materials, the electromechanical coupling coefficient with pozzolanic materials except fly ash is lower than that with plain cement, especially for silica fume having a 7.9% decrease. Raising poling field can increase electromechanical coupling coefficients. Polarization of cement-based piezoelectric composites containing silica fume in low poling fields such as 0.5kV/mm and 1kV/mm is not easy to complete.

Abstract: To solve more and more serious electromagnetic radiations, cement-based composites were prepared by introducing aramid fiber into cement. The reflection losses were studied using arched testing method in the frequency range of 1.7~18 GHz. The results showed that the absorption properties and mechanical properties were all improved preferably. The mechanisms were discussed, which indicated that the space network structure lapped into mutually by aramid fiber played an important role. The filling ratio of aramid fiber as well as the length of fiber had influence on the absorption properties, the breaking strength and the compressive strength of cement. The lowest reflection loss of -12.2 dB was obtained at 18 GHz, the effective absorption bandwidth (less than -8 dB) reached 9.15 GHz ,and the compressive strength was twice than that of cement paste when the specimen was filled with 8 vol. % aramid fiber with length of 3mm.

Abstract: The article from the energy and environment issues, elaborates the need for the development of energy-saving building, describes the characteristics and advantages of green energy-saving buildings. For the problem of high energy consumption in buildings, analyses the application of green building materials in the building envelope, from environmental protection material, renewable energy and the overall system design aspects discusses the low carbon energy- saving design, summarizes the significance of the building energy efficiency evaluation and energy consumption assessment, concludes and looks forward to the prospect of the development of green energy conservation construction.

Abstract: Natural ventilation is an important role to improve the residential building indoor thermal environment in summer. This paper use Energy Plus to simulate indoor thermal environment and use CFD to simulate indoor air flow for Xi’an residential building, analysis the influence that different ventilation mode for indoor thermal environment factors. Then with the simulated result of PMV-PPD value to estimate indoor thermal comfort. Proved night ventilation is necessary in residential building in Xi’an and effectiveness to improve indoor thermal comfort.

Abstract: The structural characteristics and heat transfer characteristics of double ventilation glass with hot channel are analyzed, whose heat transfer model is set up, we simulate air distribution of double ventilation glass with hot channel using Computational Fluid Dynamics (CFD) scheme as a simulation technique. The results show that the requirement of supplying air can be realized in winter, when the heating plates are set up in the hot channel, the air temperature of outlet is 290 K, and the flow rate of outlet is 1.03 m/s; which can be realized in summer, when the cooling plates are set up in the hot channel, the air temperature of outlet is 290 K, and the flow rate of outlet is 1.12m/s.