An analytical study of parallel-plate heat exchangers with insulation sheet inserted for double-flow operations

A design of inserting in parallel an insulation sheet with negligible thick ness to divide an open duct into two channels for double-flow operations, r esulting in substantial improvement in heat transfer, has been designed and investigated. The results are represented graphically and compared with th ose in a single-flow device (without an inserted insulation sheet). Conside rable improvement in heat transfer is obtainable by employing such a double -flow device, instead of using the single-flow one. The effect of insulatio n-sheet location on the enhancement of heat transfer efficiency as well as on the increment of power consumption, has also been discussed.