Simulation and optimisation of synthesis, design and operation of cogeneration systems
In Chapters 7, 8 and 10, indexes have been defined and procedures have been described for evaluation of cogeneration systems from the point of view of thermodynamic, environmental and economic performance, respectively. In order to perform this evaluation, there is need either to measure or to compute certain operating parameters such as electrical, mechanical and thermal energy produced, pollutants emitted, fuel consumption and various costs in a certain period of time. In order to compute these parameters, there is need to construct the simulation model of the system, which consists of a set of equations that describe the performance of the system by mathematical terms. The simulation model is also a prerequisite for optimisation of the system, that is for determining the best structure, nominal (design) specifications and operating point of the system at each instant of time, taking into consideration the technical and economic conditions prevailing at this instant. The development of simulation models and the optimisation of the synthesis (structure), design and operation of cogeneration systems are the subjects of this chapter.