Water is heated in an insulated, constant diameter tube by a 7-kW electric resistance heater. If the water enters the heater steadily at 15°C and leaves at 70°C, determine the mass flow rate of the water.
What will be an ideal response?
Water is heated in an insulated tube by an electric resistance heater. The mass flow rate of water through the heater is to be determined.
Assumptions 1 Water is an incompressible substance with a constant specific heat. 2 The kinetic and potential energy changes are negligible, ?ke ? ?pe ? 0. 3 Heat loss from the insulated tube is negligible.
Properties The specific heat of water at room temperature is cp = 4.18 kJ/kg•°C.
Analysis We take the tube as the system. This is a control volume since mass crosses the system boundary during the process. We observe that this is a steady-flow process since there is no change with time at any point and thus
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