In a counter-current flow double pipe heat exchanger (DPHE), temperature difference between the hot and cold liquids at all positions is held constant at $C$. If the effectiveness of the heat exchanger is 0.65 and heat capacity ratio of hot and cold liquids is 1 , the number of transfer units (NTU) is____________
In a counter-current flow double pipe heat exchanger (DPHE), temperature difference between the hot and cold liquids at all positions is held constant at $C$. If the effectiveness of the heat exchanger is 0.65 and heat capacity ratio of hot and cold liquids is 1 , the number of transfer units (NTU) is____________