A double-pipe parallel-flow heat exchanger is used to heat cold tap water with hot water. Hot water (cp=4.25 kJ/kg.K) enters the tube at 85°C at a rate of 0.7 kg/s and leaves at 50°C. The heat exchanger is not well insulated, and it is estimated that 3 percent of the heat given up by the hot fluid is lost from the heat exchanger. The overall heat transfer coefficient and the surface area of the heat exchanger are 1150 W/m2.K and 4 m², respectively. Hot water 85°C 13. value: 4.16 points Cold water 50°C Required information Determine the log mean temperature difference for this heat exchanger. (Round the answer to a single decimal place.) (You must provide an answer before moving to the next part) The log mean temperature difference for this heat exchanger is °C.