In the present study, The Indirect-mode forced convection solar dryer is investigated. Three types of double pass solar air heaters with flat, v-corrugated and finned absorber plate are designed and constructed to compare their thermal performance experimentally. Moreover, analytical models for the three heaters are presented. The theoretical predictions indicated that the agreement with the measured performance is fairly good. The experimental and theoretical results showed that the heater with v-corrugated plate is the most efficient heater among the three investigated heaters.So;it is...