Question

Please solve all bits. Otherwise i will thumbs down...sorry

A 200.0-liter water tank can withstand pressures up to 20.0 bar absolute before rupturing. At a
particular time the tank contains 165.0 kg of liquid water. the fill and exit valves are closed, and the
absolute pressure in the vapor head space above the liquid (which may be assumed to contain only
water vapor) is 3.a bar. A plant technician turns on the tank heater, intending to raise the water
temperature to 155°C, but is called away and forgets to return and shut off the heater. Let tl be the
instant the heater is turned on and t2 the moment before the tank ruptures. Use the steam tables for
the following calculations.
(a) Determine the water temperature. the liquid and head-space volumes (L), and the mass of water
vapor in the head space (kg) at time t1.
(b) Determine the water temperature, the liquid and head-space volumes (L), and the mass of water
vapor (g) that evaporates between tl and t2. (Hint: Make use of the fact that the total mass of
water in the tank and the total tank volume both remain constant between tl and t2')
(c) Calculate the amount of heat (kJ) transferred to the tank contents between tl and t2. Give two
reasons why the actual heat input to the tank must have been greater than the calculated value.
(d) List three different factors responsible for the increase in pressure resulting from the transfer
of heat to the tank. (Hint: One has to do with the effect of temperature on the density of liquid
water.)
(e) List ways in which this accident could have been avoided.

Answer 1