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Energy Systems for Multigeneration Purposes

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Energy Systems for Multigeneration Purposes ( energy-systems-multigeneration-purposes )

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and designers. Examples of prime mover types are internal combustion engines (ICE), external combustion engines (e.g. Stirling engines), steam turbines, gas turbines, micro turbines, biomass combustors and fuel cells. When selecting a prime mover, there are key criteria to be thoroughly considered. These include:  The demand of the electricity load should be determined by consideration of the power efficiency and possibility of having more than one prime mover.  The total amount of heat needed for heating and/or cooling demands should be determined. Based on these demands, the power to cooling and heating ratios of the desired plant is calculated.  The operating range of the prime movers can be extended. For example, a reheating system for a multi-stage prime mover can be used for this purpose.  The location of the plant could have a restriction on the acceptable noise level, on-site emissions, and the multigeneration plant size. Therefore, it is important to consider the prime mover’s noise level, emissions, and power density.  If the prime mover is going to be used for emergency application, the startup time must be considered.  The type of fuel has an impact on both operation and maintenance costs. The fuel type may affect the internal coating life time of the prime mover and, therefore, more frequent maintenance may be needed [10]. After selection of a prime mover based on the above criteria, thermal, economic and environmental analysis all need to occur, along with an optimization study to enhance the understanding of the system. 1.3.1 Gas turbine prime mover Gas turbines are one of the most suitable prime movers for multigeneration energy systems. A gas turbine, also called a combustion turbine, is a type of internal combustion engine which has an upstream rotating compressor coupled with a downstream turbine, and a combustion chamber in between. Energy is added to the gas stream in the combustion chamber, where fuel is mixed with hotairandthen ignited. In the high pressure environment of the combustor, combustion of the fuel increases the temperature. The products of the combustion are forced into the turbine section to produce shaft work. There, the high velocity and volume of the gas flow is 25

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