Study on performance of horizontal single pass shell and multi-tube heat exchanger with baffles by air bubble injection

The single pass shell and multi-tube heat exchanger with double segmental baffles'' performance improvement were experimentally investigated by two methods of air injection into shell side when an increase in air bubble created an effect in the corresponding values of shell and tube heat exchanger such as the overall heat transfer coefficient, effectiveness, NTU and the pressure loss. In the first method, air bubble injection into shell side was parallel to the cold water flow; also in the second method, air bubble injection into shell side was cross flow to the cold water with different air flow rates to calculate approximately the most favourable performance conditions. 1-6 LPM of air flow rates and 10-20 LPM shell side water flow rates were transformed with constant tube side hot water flow rate.