Water at the rate of 86 kg/min is heated from 20 to 70-C by an oil having a specific heat of 1.9 kJ/kg.-C. The fluids are used in a counterflow double-pipe heat exchanger, and the oil enters the exchanger at 110-C and leaves at 70-C. The overall heat-transfer coefficient is 230 W/m2.-C. Calculate the LMTD in -C. A) 44.8 B) 403.3 C) 37.4 (D) 561.7

please very urgent what the correct mcq and with solving pls

Hello Sir,Good Evening. I have a question in my homework related Heat Transfer lesson. The following below is my question. Please Advice. Thank You "Explain the equation used to calculate the heat flux of a counter flow type heat exchanger with a fouling factor using the LMTD concept. Write down the equations involved"

1.23. Forced air flows over a convective heat exchanger in a room heater, sulting in a convective heat transfer coefficient h 200 Btu/h-ft?.°F. The surface temperature of the heat exchanger may be considered constant at 150 °F, and the air is at 65 °F. Determine the heat exchanger surface area required for 30 000 Btu/h of heating. Ans 1.765 fi?