Development of High Performance Heat Exchanger (Environment-Friendly Energy Conservation)
Heat exchanger is an important element of electric generators, automobiles, air-conditioners, vending machines, and appliances, because its performance decides the energy consumption of the machines. The high performance compact heat exchanger is a key element in order to make a machine energy saving and compact. By controlling the flow using fins, vortex generators, and ribs, we are developing the higher performance heat exchanger and consequently aiming at environment-friendly energy-conserving machines.

Air-conditioner

Heat exchanger.

Heat transfer enhancement by vortex generator[1,2].

Numerically simulated flow field in louvered fin arrays.

Flow in rib-roughened circular straight tube (Flow visualization by using particles. Rib angle is 60deg.) [3].

References

[1] Akbari, M.M., Murata, A., Saito, H., and Iwamoto, K., Effect of Number of Tube Rows on Heat Transfer Enhancement and Flow Field with Different Vortex Generator Geometries in Fin-And-Tube Heat Exchangers, Thermal Science and Engineering, Vol.18, No.2, 2010, pp71-82.

[2] Akbari, M.M., Murata, A., Mochizuki, S., Saito, H., and Iwamoto, K., Effects of Vortex Generator Arrangements on Heat Transfer Enhancement over a Two-Row Fin-and-Tube Type Heat Exchanger, J. of Enhanced Heat Transfer, Vol.16, Issue4, 2009, pp.315-329.

[3] Mochizuki, S., Kiml, R., Murata, A. and Stoica, V., Heat Transfer Enhancement by Rib-Induced Secondary Flow inside a Circular Tube, Heat Transfer 2002, Proc. of 12th Int. Heat Transf. Conf., Grenoble, France, (August 2002), pp.141-146.