Question

A tank having a volume of 0.85 m^3 initially contains water as a two-phase liquid vapor mixture at 260 C and a quality of 0.7. Saturated water vapor at 260 C is slowly withdrawn through a pressure-regulating valve at the top of the tank as energy is transferred by heat to maintain the pressure constant in the tank. This continues until the tank is filled with saturated vapor at 260 C. Determine the amount of heat transfer in kJ. Neglect all kinetic and potential energy effects.

Answer #1

Q3. A tank with rigid walls and a volume of
0.05 m3 initially has a two-phase liquid- vapor mixture of ammonia
at a pressure of 4 bar and a quality of 10%. The tank is then
heated such that the pressure is kept constant through a
pressure-regulating valve that allows saturated vapor to escape.
The heating continues until the quality of the mixture in the tank
is 40%. Assume kinetic and potential energy changes are
insignificant. Determine:
(i) The final...

A closed, rigid tank is filled with water. Initially, the tank
holds 1.0 lb of saturated vapor and 7.0 lb of saturated liquid,
each at 212°F. The water is heated until the tank contains only
saturated vapor. Kinetic and potential energy effects can be
ignored. Determine the volume of the tank, in ft3, the temperature
at the final state, in °F, and the heat transfer, in Btu.

Water of mass 2 kg in a closed, rigid tank is initially in the
form of a twophase liquid-vapor mixture. The initial temperature is
50° C. The mixture is heated until the tank contains only saturated
vapor at 110° C.
(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.

A mixing tank initially contains 3000 pounds of liquid water.
The tank is fitted with two inlet pipes, one with hot water(90 C)
delivered at a mass flow rate of 0.8 lb/s and the other with cold
water (20C) delivered at a mass flow rate of 1.3 lb/s. Water exits
through a single exit pipe at a mass flow rate of 2.6 lb/s.
What is the temperature of the water delivered by the tank
assuming that it was initially filled...

Heat flow between connected tanks.
Two identical tanks, each with volume 0.250m3,contain steam.
Tank A contains 2.5 kg ofsteam at 400 C. Tank B contains 2.5 kg of
steam at10 bar.
a. Determine the pressure in tank A. If the state is a
vapor/liquid mixture, determine the mass fraction of the vapor.
b. Determine the temperature in tank B. If the state is a
vapor/liquid mixture, determine the mass fraction of the vapor.
c. The two tanks are linked with...

Water, initially saturated vapor at 14.6 bar, fills a closed,
rigid container. The water is heated until its temperature is
200°C. For the water, determine the heat transfer, in kJ/kg.
Kinetic and potential energy effects can be ignored.

A storage tank contains liquid water at 50oC and is vented to
atmosphere at the top (where atmospheric pressure = 101.3 kPa). The
distance from the bottom of the tank to the liquid surface level is
1.55 m. What will be the absolute pressure at the bottom of the
tank?
(A) 12.35 kPa (B) 116.3 kPa (C) 201.3 kPa (D) 113.65 kPa
The pressure of an ideal gas drops significantly as it flows
under steady state conditions through an insulated...

A mass of one kg of water within a piston–cylinder assembly
undergoes a constant-pressure process from saturated vapor at 500
kPa to a temperature of 260°C. Kinetic and potential energy effects
are negligible. For the water:
a) Evaluate the work, in kJ,
b) If the work is 30 kJ, evaluate the heat transfer, in kJ,
c) If the heat transfer is negligible, evaluate the entropy
production in kJ/K
d) Determine if the process is reversible, irreversible, or
impossible.

1 kg of water in a piston cylinder arrangement is initially in a
saturated liquid state at 1 bar. It undergoes expansion at constant
pressure due to external heat supply to it, to a final state of
saturated vapor.
(i) What is the initial temperature of water in C? (a) 93.50 (b)
96.71 (c) 99.63 (d) 111.4 (e) 12.2
(ii) What is the change in enthalpy of water (kJ/kg-K)? (a)
417.46 (b) 2258.0 (c) 2675.5 (d) 2506.1
(iii) What is...

A piston-cylinder device initially contains 75 g of saturated
water vapor at 340 kPa . A resistance heater is operated within the
cylinder with a current of 0.6 A from a 300 V source until the
volume doubles. At the same time a heat loss of 7 kJ occurs.
Part A)Determine the final temperature (T2).
Part B)Determine the duration of the process.
Part C)
What-if scenario: What is the final
temperature if the piston-cylinder device initially contains
saturated liquid water?

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