Question

A well-insulated rigid tank contains 6 kg of saturated liquid
vapor mixture of water at 150 kPa. Initially, half of the mass is
in liquid phase. An electric resistance heater placed in the tank
is then turned on and kept on until all the liquid is vaporized.
Determine the electrical work (*W*_{el}) in MJ

Answer #1

heat supplied Q is the electric work done by electric resistor .

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Initially (state 1) a well-insulated rigid tank contains 20 kg
of a saturated liquid-vapor mixture of water at 100 kPa and half of
the mass is in the liquid phase. An electric resistance heater
placed in the tank is now turned on and kept on until all the
liquid in the tank is vaporized (state 2). Determine (a) the
initial specific volume in m3/kg, (b) the final specific
entropy in kJ/kg.K and (c) change of entropy in kJ/K.

Initially (state 1) a well-insulated rigid tank contains 20 kg
of a saturated liquid-vapor mixture of water at 100 kPa and half of
the mass is in the liquid phase. An electric resistance heater
placed in the tank is now turned on and kept on until all the
liquid in the tank is vaporized (state 2). Determine (a) the
initial specific volume in m3/kg, (b) the final specific
entropy in kJ/kg.K and (c) change of entropy in kJ/K.

A well-insulated rigid tank contains 5-kg of a saturated
liquid-vapor mixture of water at 100 kPa. Initially, three-quarters
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take to vaporize all the liquid in the tank. Show the process on a
T-v diagram with respect to saturation lines.

A 0.1-m3 rigid tank contains saturated liquid-vapor mixture of
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system, a rigid tank, contains mixture of saturated water vapor
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(i) Find the initial pressure, in kPa.
(ii) Find the work for the process, in kJ.
(iii) Find the heat transfer for the process, in kJ.

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