In　this　study,　a　comparative　investigation　of　two　types　of　microheat　pipe　array　(MHPA)　flat-plate　solar　air　collectors　(FPSAC)　based　on　exergy　analysis　has　been　conducted.　The　thermal　performance　of　MHPA-type　solar　air　collectors　(SACs)　with　two　different　shaped　fins　is　experimentally　evaluated.　A　detailed　parametric　study　is　also　conducted　to　examine　the　effects　of　various　fins,　operation　parameters,　and　inlet　air　temperature　at　different　mass　flow　rates　on　thermal　and　exergy　efficiencies.　Results　indicated　that　using　V-shaped　slotted　fins　at　the　specified　range　of　mass　flow　rates　can　enhance　exergy　efficiency.　Exergy　efficiency　can　be　considered　as　the　main　criterion　to　evaluate　the　performance　of　MHPA　FPSACs.　Attaching　V-shaped　slotted　fins　on　the　condenser　section　of　MHPA　is　more　effective　than　attaching　rectangular　fins　at　high　mass　flow　rates.　By　contrast,　the　latter　is　more　effective　than　the　former　at　low　mass　flow　rates.