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important parameters that control the performance and equilibrium values of the microturbine will be described below. With the choked mass flow model of the turbine, the mass flow and pressure ratio of the microturbine at equilibrium are determined by the throttle area parameter, Athr. If the throttle area is increased, the equilibrium value of the mass flow will increase, while the corresponding pressure ratio value will decrease. From the blueprints of the microturbine we can get a initial estimation and then we have to adjust it so that the equilibrium values of the model corresponds to the measured equilibrium values of the real microturbine. It is very important to have a correct value of the temperature of incoming air, since a gas turbine has a higher efficiency at lower air temperatures, see equation (2.4.1). The default air temperature is set to 18° C for the reason that the DSA data has been generated based on that temperature. Other important parameters are the pressure of inlet air and flue gas at the outlet of the microturbine, i.e. the pressures in the source and the reservoir. The efficiency can be sensitive to small changes in pressure of the combustion chamber. All simulations were solved by DASSL, a differential-algebraic-equations solver, in Dymola. The tolerance was set to a value of 1e-6 for all simulations in this thesis. 43PDF Image | Modelling of Microturbine Systems
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