In this communication, a detailed theoretical performance and economic
analysis of conventional solar air heaters with bare plate, single co
ver and double cover have been reported. Evaluation of the annual cost
(AC) and the annual energy gain (REG) of the collectors has been perf
ormed and the ratio AC/AEG is displayed for different combined values
of m, L and Z to make it feasible for the users to select optimum desi
gn and operational features which correspond to minimum AC/AEG.