Investigation of heat transfer and flow resistance of tubular gas-gas heat exchanger with contracted-expanded tube bundles and spiral fluted tube bundles and air flowing parallel to tube bundles in the shell side is reported. Comparison of heat transfer performance was made between this type of tubular gas heat exchanger and the segment baffled tubular gas heat exchanger under the same conditions of total gas pressure drop in the tube and shell sides

total volume flow rate

temperature difference and rate of heat transfer. The results showed that the total heat transfer coefficient K of gas heat exchanger with contracted-expanded tube bundles was 64.8% higher than that of segment baffled tubular gas heat exchanger

and 40% of heat transfer surface area could be saved.