Advanced Materials Research Vols. 594-597

Abstract: Water demand prediction adopts combined prediction method based on BP neural network prediction model, grey G (1,1) prediction model, time sequence prediction model (second multinomial exponential smoothing model) and single linear regression model (Cubics Ratio model). Empirical results show that combined prediction method makes comprehensive use of information of every separate prediction model, and thus enhances prediction accuracy.

Abstract: The comprehensive pipeline is a kind of important facilities and equipment and the key to normal operation in metro station, and the certain design requirement of various pipelines’ headroom in specific spatial region need to be met. As a technology centralized upon information and based on three-dimensional mode, BIM technology can express three-dimensional model of metro comprehensive pipeline imaginatively, provide the spatial topological relations among pipelines and relevant detecting calculations. In this paper, the necessity of identification of headroom of metro comprehensive pipeline is deeply analyzed, and then the article designs identification algorithms of headroom of metro comprehensive pipeline according to BIM technology. This algorithm can detect the pipelines which not meet the design requirements of headroom on BIM platform efficiently, thus we can improve design efficiency and quality and liberate labors so that designers can be engaged in more complex design work

Abstract: Drainage inlets at the Namsan #3 traffic tunnel in Seoul, South Korea were found to be clogged with calcium carbonate scale deposits. Officials were concerned the clogged drains would further stress the already deteriorating traffic tunnel and wanted to see if there were any practical and economical solutions in removing or preventing scale deposits. A tunnel drainage simulator was constructed to determine the feasibility of using magnets to inhibit scale precipitation and deposition. Test results from the simulation show 6.0 and 4.4 g of deposited calcium carbonate in pipes inclined at 2° and 5° respectively, while magnetically treated water resulted in 10.8 and 4.3 g of deposited calcium carbonate in pipes inclined at 2° and 5° respectively. Calcium carbonate scale samples from the tunnel drainage test underwent x-ray diffraction analysis and showed the magnetically treated water to precipitate more aragonite. The solubility product and crystalline structures of calcite and aragonite are able to help explain tunnel drainage test results and suggest water flow velocity to be a potentially important factor in calcium scale inhibition if magnets are used.

Abstract: The purpose of this study is to investigate the characteristic of pollutants overflow on storm events, relationships between pollutant load and rainfall duration, and rainfall intensity in Chaotian Palace, Nanjing City. The results showed that high pollutant concentrations were observed in the initial stage of runoff and decreased continuously over rainfall duration. Moreover, the wash off ratios of pollutants load decreased with rainfall intensity declining. Furthermore, initial 5, 10, 20, 30, 40 min intervals of a rainfall event were chosen to investigate the variation of pollutants load decrement rate of CSOs. An obvious corner at initial 10 min was observed for all parameters in whole storm events. The slope of curves before 10 min is steeper than after that one. Based on the analysis on pollutants load decrement rate of CSOs, 10 min could be chosen as control point in intercepted engineering for optimizing treatment facilities in order to achieve cost-effective CSOs control.

Abstract: The water of Shenwo reservoir has been seriously polluted. In order to avoid the inaccurate evaluation results of a single index, the variable fuzzy comprehensive evaluation method has been adopted to comprehensively evaluate the water quality of Shenwo reservoir based on the water quality data of Lan River section of Shenwo reservoir in 2011. The evaluation results have shown that the water quality of Shenwo reservoir belongs to grade Ⅳ, which tends to be grade Ⅲ. The evaluation results based on this approach will be more stable and reliable.

Abstract: Drop structures are commonly used to convey water from a higher to a lower elevation in different engineering domains, especially the vortex drop structure. Because of complex flow properties and construction technology, the system running security should be verified before it was built. In this paper, numerical simulation method was employed to analyze the hydraulic characteristics in a tangential vortex dropshaft. It is shown that there is a control section in dropshaft, and inhaled water at the control section should be avoided during the running and designing process. The numerical model is able to provide an insight into the hydraulic behavior at different flow size, and can be extended for other design verification in engineering.

Abstract: In order to improve the cooling effect and practical applicability of falling temperature technique on high-temperature workplaces, the aeration and cooling principle of the high pressure water rotational jetting ventilation were analysed, and the experimental study was carried out. The results show that water pressure and cooling rate are an approximation of parabolic growth relationship, different structure of jet tube and temperature difference on water and gas also have an obvious effect on the cooling amplitude and air quantity. the guide vanes installed may improve effect of ventilation and cooling the capacity on high pressure water rotational jetting.

Abstract: Take one of Grade III-A general hospitals in Wuhan as the research object with auditing the hospital's energy consuming system. It can be proved that the energy consumption per unit area is 27kgce/m2 , analysis of typical of the hospital exterior envelope, lighting systems, central heating and air conditioning system for hospital energy, gave priority to recycle the boiler flue gas heat and condensation water, natural light using, exterior windows transforming and installation of the sub-metering systems for energy saving renovation. The comprehensive transformation energy-saving rate is 31.71%. Energy saving quantity is 318.01tce. A total investment is 4.3948 million yuan. The payback period is 2.5 years.

Abstract: According to the problem that the components of HVAC system have the strong coupling and the low energy efficiency, a kind of optimal model for HVAC based on system energy input ratio (SEIR) is proposed. Firstly, according to each equipment characteristic, the performance curve model of each equipment power is built. Based on these models, the performance curve model of system energy consumption is built too. Then, basing on energy conservation constraint, each equipment performance constraint and coupling constraint, the constraint equation is built. Finally, simplifying the model parameter, taking the least energy input ratio as an objective function, the optimal set point model of various equipments is built. The experimental results indicate that compared with the least energy consumption optimal method, the model has better energy saving effect.

Abstract: The numerical simulation for radiant tube heat transferring process of the gas-infrared heated room was finished. By means of numerical calculation, the influences of radiant tube emittance to the indoor temperature and workspace air temperature as well as the heat radiation flux were studied. The results show: The greater of radiant tube surface emittance, The higher of the total heat flux, meanwhile, workspace average temperature and average radiation temperature are rise.