Abstract
Due to the widespread use of solar air heaters, choosing the best optimal state from a thermodynamic and economic point of view among the types of solar air heaters with different roughened surfaces and impingement jets is very important. The present article focuses on the economic, energetic and exergetic optimization of roughened solar collectors with and without impingement jet. The efficiency of energy and exergy as well as cost function are objective functions. As the optimization results by the genetic algorithm are in the form of a set of optimized solutions, they are prioritized with the aid of TOPSIS decision-making method and defining a weighting coefficient for the criteria. Adding a jet plate to the solar collector increases efficiency of energy and exergy as well as the costs. The pollutants prevented through the use of this device see a considerable rise. The maximum energy efficiency is 59.43% and the highest exergy efficiency reaches 1.58%. Existence of jet plate increases the heating power, temperature difference and amount of prevented environmental pollutants CO2, SO2 and NO, on average, 122.6%, 63.34%, 122.6%, 122.66% and 123.19%, respectively. Efficiency of energy and exergy and costs are increased by about 2.23%, 59% and 150%, respectively.
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