Question about question 28 on the morning of the first day of the 2011 exam for the relevant major
Thread Content
28. For a heat exchanger with a water flow rate of 590 m/s, an inlet water temperature of 20°C, and a heat transfer rate of 3.5×104 kJ/s, given that the specific heat capacity of water is 4.1868 kJ/(kg•°C) and no heat losses are considered, what is the outlet water temperature in °C? Choose from the options below A、40 B、35 C、45 D、34. Something seems wrong with this water flow rate
The flow rate unit is m/s, there must be a problem
The mass flow rate of D should be in kg/s； 590*4.1868 (T-20) = 35000, T=34C