Three new coiled flow inverter (CFI) heat exchangers with heat transfer area (A(t)) of 0.88 m(2) (4-banks), 0.44 m(2) (2-banks) and 0.22 m(2) (1-bank) were designed, fabricated and commissioned to develop a more compact heat exchanger. More than 800 experiments were carried-out in counter-flow configuration. The hot and cold fluids were used in the tube and shell side of CFI heat exchanger, respectively. Tube side flow rates were varied from 50-300 kg/h for water and 30-100 kg/h for compressed air, respectively. The shell side flow rates were varied from 100-2000 kg/h for water and 400-750 kg/h for air, respectively. The overall heat transfer coefficients of present CFI heat exchangers were found in good agreement with the results reported for the CFI heat exchangers of A(t)=1.76 m(2). The proposed CFI heat exchanger with A(t)= 0.22 m(2) provides 2.2-4.5 and 2-3.6 times higher overall heat transfer coefficient as compared to SHE and PHE of A(t) = 1.76 m(2), respectively. The present study offers a small footprint CFI heat exchanger to meet the same heat transfer duty as compared to previously reported study. (C) 2016 Elsevier B.V. All rights reserved.