Advanced Materials Research Vols. 374-377

Abstract: Site investigation on air conditioning systems (ACS) in three internet data centers (IDCs) in Xi’an city was conducted, the relative data used for issues analysis was obtained from on-site testing of temperature field and velocity field in IDCs and online working meter on power distribution box of ACS and computer cracks, the field investigation found that there were three main problems: high temperature alarm of larger power electronic components in computer cracks; irrational air distribution around computer cracks; and not high energy efficiency of ACS. Corresponding problem causes were analyzed and strategies of problem solving were proposed in this paper.

Abstract: The purpose of this paper is to analyze the sludge characteristics of the Qingdao Ni Buwan Sewage Treatment Plant and introduces the sludge disposal technique in recent years and designs an incineration working procedure on power station. The method used in our study is known as directly heat dry-cure incineration technique for generate electric power in Qingdao Jiaonan Power Co., Ltd. We have carried out several sets of experiments to test the validity of incineration generate electric power. The results of the experiment indicate that this incineration program is practicable, resolves the sludge disposal problem in Qingdao Ni Buwan Sewage Treatment Plant and has effect and profit in economic , social and environment.

Abstract: Introduces the construction and operational aspect of 15 plots of existing buildings heat metering demonstration engineering in Xingtai, arranging the average heat consumption of Xingtai city, each plot, each building, every heat user according to the actual operating data. The results of data analysis indicate that the heat allocation technique based on on-off time and area method can characterize the users' demand for the size of the heat correctly, achieve the purpose of a reasonable heat metering. Applying the heat allocation technique based on on-off time and area method in the actual project is feasible, can popularize and apply extensively.

Abstract: In heat source ability sufficient situation, Yuhua network in Shijiazhuang had some phenomenon, such as uneven heating, serious disorders, the far-end heating reliability was insufficient. Based on the basic principle of Graph theory, this article carried on the detailed hydraulic calculation to the annular pipe network, determined and implemented the reasonable transformation program, finally carried on the investigation and study test to the actual operation network after reformation. The results show that after reformation, the actual heating network runs well, improves the heating security and reliability, so the hydraulic calculation method based on Graph theory is accurate, and has certain guiding sense to other pipe networks' energy conservation reformation.

Abstract: At present, the research ways of stratified air-conditioning technology mainly have two types, experimental study and numerical simulation. In this paper, a transparent Plexiglas model was designed, of which the size was supposed to be 1/50 of the real scale. PIV technology was innovatively applied into the experiment to measure the air distribution of an industrial plant. Different air supply velocities and different kinds of air supply outlets were taken into account to discuss the influence of them. Results revealed that as the jet velocity increased gradually, the airflow’s stratification effect became more evident. When the aspect ratio changed from 1:2 to 1:8, the diffusion degree in vertical direction increased obviously. In comparison with the rectangular air supply outlet, the circular one had lower decay, longer jet distance and better contractibility. The experimental findings are useful for optimizing the design of air distribution in high ceiling industrial plant.

Abstract: This paper discusses the status of energy consumption and architectural energy-saving in China nowadays and describes the necessity of energy-saving, then the author analyses the problems in the energy-saving work in China and provides some solutions to the relevant problems. In the end, this paper also expounds the importance of developing and utilizing renewable energy such as solar power.

Abstract: This article is based on the experimental investigations on flow boiling heat transfer of R113 with the equivalent diameter of the square tube 15.66mm, mass flow rate 500 ~ 2000kg / (m2•s), steam quality from 0.1 to 1, heat flux 50 ~ 90kW/m2, and pressure 100 ~ 250 kPa. The experimental results show that with the rise of heat flux and mass velocity the local convection heat transfer coefficient increases, and with the enhancement of steam quality the local convection heat transfer coefficient increases firstly and then decreases. By comparison of the experimental data and the calculation results of predecessor’s correlations, a correction coefficient applicable to this experiment was obtained.

Abstract: The liquid scale model test is set up to research on the velocity characteristics of coupling airflows between subway piston wind and platform air jet. Model test and prototype meet the dynamic similarity. Piston wind variation rules on the test are validated with previous conclusions. The coupling airflows trajectory is closer to the horizontal direction with increasing piston wind. Under the constant air supply, the coupling velocities of measuring points increase with piston wind growing. The piston wind has more obvious influence on the coupling airflows than air jet.

Abstract: The DeST is used to simulate the convention island building energy consumption of nuclear power station under different operating modes and building performance. Changing the operating mode is found to be an effective way to save the energy consumption of nuclear power station. The annual accumulative cool load will decrease 12% when the air conditioning operating temperature is changes from 35°C to 40°C in the season when air conditioning is used. And the annual accumulative cool load will decrease 5% when the air change rate increases 1 times/h in the season when mechanical ventilation is used.

Abstract: The demand of temperature and humidity in textile factory is higher, in order to be able to accurately independent control temperature and humidity and solve the problem of excessive consumption of energy, Introduce the temperature and humidity independent controlled air-conditioning system (THIC). The enthalpy-humidity chart of the air-conditioning process and energy cost are analyzed and compared for the air-conditioning. It indicates that THIC not only can satisfy the production process requirement, and can use low grade energy and reduce energy consumption.