TY - JOUR
TI - Experimental investigation on thermal performance of nanocoated surfaces for air-conditioning applications
AU - Meikandan Megaraj
AU - Malarmohan Keppan
AU - Hemachandran E
JN - Thermal Science
PY - 2019
VL - 23
IS - 2
SP - 457
EP - 463
PT - Article
AB - Extended surfaces are frequently used in heat exchanging devices for  increasing the heat transfer between a primary surface and the surrounding  fluid. Heat transfer augmentation by providing an extended surface to air  side, increases weight of the system, obstruct airflow, increases pressure  drop and pumping power to keep the fluid stream flowing. These major  problems will be minimized with the help of recent developments in the field  of nanotechnology that provides an avenue to augment heat transfer by  providing a coating of nanometer thickness on the heat exchanger surface.  The present work aims to investigate the effect of the nanocoating on the  heat exchanger surface with the experiments. The experimental results show  that the presence of nanocoating does not have any effect on drag change,  where the actual pressure drop of the coil for air velocity of 0.6 m/s, 1.6  m/s is 20 Pa and 60 Pa respectively. For nanocoated surface, 24.2 %  improvement in heat transfer rate was observed and transient temperature  response of the nanocoated heat exchanger tube is higher than uncoated one  for a given experimental conditions.