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Jin T.,Zhejiang University | Zhang L.,Hunan Electrical Power Design Institute | Luo K.,Zhejiang University | Fan J.,Zhejiang University
Journal of Thermal Science | Year: 2013

Based on the heat and mass transfer theory and the characteristics of general-purpose software FLUENT, a three-dimensional numerical simulation platform, composed of lots of user defined functions(UDF), has been developed to simulate the thermal performance of natural draft wet cooling towers(NDWCTs). After validation, this platform is used to analyse thermal performances of a 220m high super large cooling tower designed for inland nuclear plant under different operational conditions. Variations of outlet temperature of the cooling tower caused by changes of water flow rates, inlet water temperatures are investigated. Effects of optimization through non-uniform water distributions on outlet water temperature are discussed, and the influences on the flow field inside the cooling tower are analyzed in detail. It is found that the outlet water temperature will increase as the water flow rate increases, but the air flow rate will decrease. The outlet water temperature will decrease 0.095K and 0.205K, respectively, if two non-uniform water distribution approaches are applied. © 2013 Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag Berlin Heidelberg. Source


Hou H.,North China Electrical Power University | Zhou C.,Hunan Electrical Power Design Institute | Yang Y.,North China Electrical Power University
Taiyangneng Xuebao/Acta Energiae Solaris Sinica | Year: 2014

The heat-transfer flow mathematic model of collector was established taken a parabolic trough collector as the research object. Its heat-transfer performance and flow property were studied by using the FLUENT simulation. Compared to the experiment results of the research, the simulation results have a good coincidence with them. Against the above, the principle that several factors, such as DNI, the fluid temperature at the entrance of collector and the speed of heat-transfer fluid, which affect the collector are analyzed. And then the speed of heat-transfer fluid in collector is optimized, which will provide the reference for the optimized design and operation of trough solar collector. Source


Song S.,Changsha University of Science and Technology | Xu J.,Changsha University of Science and Technology | Zhang C.,Hunan Electrical Power Design Institute
Advanced Materials Research | Year: 2013

Sustainability is an important concept in today's architecture and will be even more so in the future. This paper explores sustainable design strategies through several cases of campus building. Five strategies of sustainability are studied: context, aesthetic, materials, energy and enhance lives of inhabitants. The conclusions show that sustainable design strategies are naturally producing building with a regional character. The approach varies according to the opportunities and constraints of each project, and with the ecological characteristics of each region. © (2013) Trans Tech Publications, Switzerland. Source


Wang Y.,Guangxi University | Wang Y.,Changsha University of Science and Technology | Jian J.,Guangxi University | Zeng X.,Changsha University of Science and Technology | And 2 more authors.
International Journal of Electrical Power and Energy Systems | Year: 2012

A new type of high-voltage generator which offers a direct connection to the power network without the need for a step-up transformer is called powerformer. The neutral of the most powerformers is unearthed which belongs to NIEPS. When a stator single phase-to-ground fault occurs in a powerformer, every generator that is connected in parallel with the faulty powerformer has the same voltage. Traditional protection schemes using zero sequence voltage and third-harmonic voltage signals cannot detect which powerformer is faulted. In order to solve this problem for powerformer protection, a novel stator single phase-to-ground fault protection based on the direction and magnitude of zero-sequence currents is proposed in this paper. Simulation results have shown that, under different fault conditions, the new scheme can distinguish reliably internal faults from external faults, and can detect stator single phase-to-ground fault occurred in which powerformer with resistance 1 kΩ. A 100% of the winding can be fully protected. © 2011 Elsevier Ltd. All rights reserved. Source


Liu S.-X.,Changsha University of Science and Technology | Liu S.J.,Hunan Electrical Power Design Institute
Advanced Materials Research | Year: 2013

Base on the analysis of problems of previous pile-soil displacement model, rigid pile settlement under embankment load method was established, this method can also consider the factors of soil and the relative slip between pile and earth deformation dyssynchrony. Some theories were described in part I. In this part, some theoretical calculations and an engineering example was analyzed and shows that the rationality and feasibility of the method. © (2013) Trans Tech Publications, Switzerland. Source

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