Second law optimization of flat-plate solar air heaters. Part 2: Results of optimization and analysis of sensibility to variations of operating conditions

摘要: By maximizing the net exergy flow gained within a solar collector, collector configuration can be optimized with regard to high useful heat and low friction losses. The results of numerical optimization are presented for different types collectors. using finned absorbers duct geometry, thermal efficiency increased power reduced strongly, compared an absorber without fins. A fin density is not thrifty, difference between various fins small. transfer characteristics less important if highly insulated air heaters considered. influence varying operating conditions on analyzed. appendix in way that optimum geometry found simply cases technical interest.