Current Issue : July - September Volume : 2016 Issue Number : 3 Articles : 4 Articles
A proactive heating method is presented aiming at reducing the energy consumption in a HVAC system while maintaining\nthe thermal comfort of the occupants. The proposed technique fuses time predictions for the zones� temperatures, based on a\ndeterministic subspace identification method, and zones� occupancy predictions, based on a mobility model, in a decision scheme\nthat is capable of regulating the balance between the total energy consumed and the total discomfort cost. Simulation results for\nvarious occupation-mobility models demonstrate the efficiency of the proposed technique....
In considering of high proportion of renewable energy supply in 2050, the accelerating of energy\nconsumption gross, source and environment can affect the energy system restrict affection are\nstronger. Add wind and solar to electricity energy with large amount of energy source exploitation.\nThe energy source amount per person is lower. Considering the renewable energy amount and\nsupply, primary energy storage and structure problem is standing out. Before the wide spread of\nrenewable energy, Using the high-carbon energy in China can pollute seriously. Chinese energy\nsupply and demand problem is research key point. This paper researches Chinese energy supply\nand demand pattern system and evaluation methodology, gives out the inner and outer influencing\nelements. And evaluate Chinese energy supply and demand pattern from energy gross, structure,\ndistribution and transportation. Use energy supply synthesize radar comparison chart in\ncertain time period. From energy security, economy, clean and efficiency, analyze the benefit\ncomparisons of Chinese energy supply and demand pattern. This energy supply and demand pattern\nmodel will give one certain theoretical analysis and practice reference to the further high\nproportion of renewable energy....
This investigation presents the strategy of high-efficiency solar electricity of umbrella by TRIZ\n(Theory of Inventive Problem Solving) analysis. According to the combined statistics of classical\nand new contradiction matrix, the invention principles can be used for designing tracking irradiance\nof surface plane of umbrella orientations including tilted angle () and azimuth angle (Ã?Ë?).\nThree geographical sites are discussed by regions of Berlin, Taipei and Wellington located in north,\nnear and south of tropic of cancer, respectively. The optimal design of azimuth surfaces of umbrella\ncan be obtained by electricity gain at a fixed tilted angle...
The Conservation Voltage Reduction (CVR) is a technique that aims to achieve the decrease of\npower consumption as a result of voltage reduction. The customer is supplied with the lowest\npossible voltage level compatible with the stipulated level by the regulatory agency. International\nStandards ANSI C84.1-2006 and IEEE std 1250-1995 specify the range of supply voltage to electronics\nequipment from 0.9 to 1.05 pu of nominal voltage. To analyse the CVR effect in distribution\nsystems with different load characteristics (residential, commercial, industrial or a combination\nof these), mathematical load models are used. Typically, these equipment/load models are used to\nanalyse load aggregation without any consideration of its nonlinearity characteristics. Aiming to\nanalyse the nonlinear characteristics and its consequences, this paper presents a discussion of the\nneglected variables as well as the results of a set of measurements of nonlinear loads. Different\nmathematical models are applied to obtain them for each load. Using these models the load aggregation\nis evaluated. It is presented that although the models show adequate results for individual\nloads, the same does not occur for aggregated models if the harmonic contribution is not\nconsidered. Consequently, to apply the load model in CVR it is necessary to consider the harmonics\npresence and the model has to be done using only the fundamental frequency data. The discussion\nabout the causes is done and the models are compared with the measurements....
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