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Proceedings of the World Congress on Engineering and Computer Science 2007 WCECS 2007, October 24-26, 2007, San Francisco, USA
Modeling and Simulation of Natural Gas Microturbine for Residential Complexes
A.B.M.Aguiar, J.O.P.Pinto and L.A.H.Nogueira
Abstract— In the paper, the authors have investigated the natural gas based microturbine of residential complex with the Matlab. The aim of this work is to present a daily simulation model for technical and economical analysis of natural gas microturbine application for residential complex. The main advantage of this model is the timeframe that is used, which is flexible, varying from hours, days, weeks, up to years. Therefore, the work granularity allows take into consideration details that conventional methodology does not. In this paper are given details of the model, and simulation results are provided to show it feasibility. The results from this work may be useful as a decision support system by investors.
Index Terms— cogeneration, load curve, microturbine, residential building, simulation.
THE residential environment is favorable to cogeneration systems, because it presents an expressive thermal demand. The electrical energy consumption in the
residential class is responsible for 25% of the total electrical energy consumed in Brazil and concentrates around 85% of the total consumers units.
CHIRADEJA defends that some DG technologies produce electrical energy almost as efficiently as large central-station power plants and at a cost competitive with centralized generation for certain applications with less environmental impacts and flexibility in siting. DG can be used to match increased customer demand where the upgrade or installation of new transmission/ distribution lines are not available for one reason or other.
The great attractive of the cogeneration is this high energetic efficiency. While a thermoelectric plant of combined cycle has a performance of 55%, a cogeneration plant performance can get around 90%. However, the cogeneration do not apply to all the energy’s consumers, it is necessary a profile of electrical and thermal demand with some equilibrium and simultaneity.
A.B.M. Aguiar, is with the Electrical Engineering Department, Federal University of Mato Grosso do Sul, Campo Grande (e-mail: firstname.lastname@example.org).
J.O.P. Pinto, is with the Electrical Engineering Department, Federal University of Mato Grosso do Sul, Campo Grande (e-mail: email@example.com).
L.A.H. Nogueira, is with the Mechanical Engineering Department, Federal University of Itajubá, Itajubá (e-mail: firstname.lastname@example.org)
Cogeneration applications to residential buildings have to satisfy either both the electrical and thermal demands, or satisfy the thermal demand and part of the electrical demand, or satisfy the electrical demand and part of the thermal demand. Depending on the magnitude of the electrical and thermal loads, whether they match or not, and the operation strategy, the cogeneration system may have to run at partial load conditions. In such case, the surplus energy (electricity or heat) may have to be stored or sold, and deficiencies may have to be made up by purchasing electricity (or heat) from other sources such as the electrical grid (or a boiler plant). 
The surplus heat produced can be stored in a thermal storage device such as a water tank or in phase change materials, while surplus electricity can be stored in electrical storage devices such as batteries or capacitors. In addition, the operation of a cogeneration system may be dependent on varying electricity prices, allowing cogeneration systems financially attractive in periods of high electricity prices. 
The electric efficiency of the system is defined by the electric power output to the fuel input, ratio as shown in (1). The efficiency of a cogeneration system is measured by the fraction of the input fuel that can be recovered in heat and electric power form, the remaining energy are loses, as given in (2).
Electric Efficiency = Electric power (kW ) (1) Fuel Input (kW )
Total Efficiency = Thermal Energy + Electric power (kW ) (2) Fuel Input(kW)
The efficiency of a cogeneration depends on the type of the primer machine, its size, and the temperature which the recovered heat can be used. Also, the efficiency depends on the condition and the operating point of the cogeneration unit. 
On the adoption line of new technologies of electric energy generation with natural gas, the microturbine detaches by the low emission level and the low maintenance, especially when compared with the gas engine.
The functioning of a gas microturbine is simple, the fuel is burned in a combustion chamber, and the proceedings gases of this burn are directed by the compressor to inside of the turbine, where its energy is converted to mechanical energy, that can be used for electric energy production via an alternator, as for prime mover of bombs and compressors, etc. In some case, if
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