2. Hot water enters into a double pipe counter flow HX at temperature of 100 C with 3 kg/s mass flow rate. Besides that cold fluid enters into the HX at 15 C and goes out at temperature of 45C with mass flow rate of 0,25 kg/s. Specific heat of hot fluid and cold fluid are Cphot 4180 j/kgC and Cpcold= 4190 j/kgC. Overall heat transfer coefficient is U= 950 W/m2C. Determine the net rate of heat transfer and the Heat transfer surface area of the HX? (