Numerical Simulation of Heat Transfer Characteristics of Finned Tube Heat Exchanger at Different Flow Velocities

Abstract A heat exchanger is an important component where high-temperature hot air and normal-temperature water exchange heat. The area of the finned tube calculated by rated working conditions. However, with decrease storage temperature, temperature at outlet thermodynamic energy device changes in a large range, directly affecting capacity efficiency exchanger. This paper’s three-dimensional model established. designed according to section return system. physical parameter property characteristics which exchanger’s air’s velocity range 1∼10 m/s are simulated fluent software. velocity, pressure, coefficient distribution different positions along airflow direction obtained. simulation results show that mean flow 2.0 5.0 inlet cross-section. average difference between 69.5 K 100.5 K, respectively. fin surface first eighth rows tubes 12.5 14.4 pressure loss channel inlet’s outlet’s 16.1 Pa 69.4 Pa, When rate change from starting 1.0 ending 10.0 m/s, tube’s wall transfer, second level tubes, only increases 1.8 times. transfer maximum, 5 times original, but always strongest.