| Popis: |
Exergoeconomic is the combination of exergy analysis and cost estimation based on exergy values at each state. Application of exergoeconomic in multi-generation systems mainly aims at designing more sustainable units in terms of waste handling by considering cost and the source of irreversibility. Unlike many other cost methods applied to multi-generation system, manipulating the overall cost of a complex system in exergoeconomic analysis by defining a unit overall product cost with the influence of each product cost separately is fully straightforward. Due to this and many other merits of exergoeconomic in cost estimation of multi-generation systems, exergoeconomic analysis of the devised solar tower-based multi-generation system in the previous chapter is carried out in here. To attain this goal, exergy analysis of the reckoned setup is performed. Results of exergy analysis indicated that the receiver has a pivotal role in the overall exergy destruction by exergy destruction of 2006 kW, followed by heliostat by 1867 kW. The overall exergy efficiency and cost of the system are computed 21.45% and 743.2 $/h, respectively. At last, an extensive parametric study is presented to demonstrate altering trend of the chief performance criteria around the base input data. It was discerned that exergy efficiency can even be raised up from the base value with the rise of direct normal irradiance (DNI), receiver concentration ratio, and heat exchangers effectiveness or with the decrease of the generator pinch point temperature, ambient temperature, and amount of electricity supplied to the transcritical CO2 refrigeration cycle. In terms of cost, the overall cost rate parameter can be decreased by decreasing the amount of electricity supplied to the transcritical CO2 refrigeration cycle, heat exchangers effectiveness, generator pinch point temperature, DNI, and receiver concentration ratio. |
