Hot and cold fluids enter a parallel flow double tube heat exchanger at 100 °C and 15 °C, respectively

Q. Hot and cold fluids enter a parallel flow double tube heat exchanger at 100 °C and 15 °C, respectively. The heat capacity rates of hot and cold fluids are Ch = 2000 W/K and Cc = 1200 W/K, respectively. If the outlet temperature of the cold fluid is 45 °C, the log mean temperature difference (LMTD) of the heat exchanger is   K (round off to two decimal places).

Ans: 57.71 °C

Sol: