hiTRAN Thermal Systems improve performance directly, increasing tubeside heat transfer coefficients. There are also a number of indirect performance benefits which arise from the use of this technology:
Graphical representation of plain tube and hiTRAN enhanced performance range
When fluid flows through a plain tube the fluid nearest the wall is subjected to frictional drag, which has the effect of slowing down the fluid at the wall. This laminar boundary layer can significantly reduce the tube-side heat transfer coefficient and consequently, the performance of the heat exchanger.
Inserting correctly profiled hiTRAN Matrix Elements into the tube will disrupt the laminar boundary layer, creating additional fluid shear and mixing, thereby minimizing the effects of frictional drag. hiTRAN Matrix Elements are particularly effective at enhancing heat transfer efficiency in a plain tube design operating at low Reynolds Numbers (laminar to transitional flow.) Although the heat transfer increase is greatest in the laminar flow region (up to 20 times), significant benefits can be obtained in the transitional flow regime (up to 15 times) and turbulent flow regime (up to 3 times.) Cal Gavin have installed hiTRAN Systems in heat exchangers operating in range of Reynolds number from 1 to over 100,000.
Whilst there is an increase in frictional resistance associated with hiTRAN Systems, the amount of enhancement is such that solutions can be found which offer increased heat transfer at equivalent or lower pressure drop than a plain tube.
Improved performance is best illustrated with case studies below. Full details for any of the case studies CASE STUDIES >>