Question

Consider 1 kilogram of saturated water at 70 degrees celsius in a closed and rigid container which is heated to steam (superheated water) at 300 degrees celsius and 5 MPa by adding 1500 kJ of heat.

a) What is the fraction of vapour and liquid at the initial state?

b) What is the work done as a result of the heating process?

Answer #1

At initial state we have saturated steam at 70 oC

as the question itself says saturated water we have saturated water

**1.) Hence, fraction of water = 1 and fraction of vapor =
0 at initial state**

H at initial state = 293 Kj/Kg

amount of water = 1 Kg

H1 = 293 KJ ( from steam table)

Final state 300 oC and P = 5 MPa

H2 =2925.64 KJ ( from steam table)

2.) Work done = H2-H1 = 2925.64 - 293 = 2632.64 KJ is the amount of heat required or the work that has to be done to the system.

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.

one
kilogram of R-134a fills a 0.06 m^3 rigid container at an initial
temperature of 0 C. the container is then heated until the
refridgerant becomes saturated vapor. defermine the phase of the
initial state:
a. saturated liquid
b. sarurated vapor
c. saturated liquid vapor mixture
d. super heated vapor
e. compressed liquid

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.

Please do it as fast as you can, with step .
1. A closed rigid tank starts with 0.017263 ft^3 of saturated
liquid and 8.3 ft^3 of saturated vapour at 200 F. The water is
heated until it contains only saturated vapour.
Please find a)original liquid mass, b) original vapor mass, c)
original quality d) final temparature and e) total heat tranfer

35 mL of water is at 87 degrees Celsius. This water is heated,
becomes steam and then continues heating to a temperature of 106
degrees Celsius. How much heat was absorbed due to this
process?
Cwater= 4.186 J/g
C Csteam= 2.02 J/g
C Vaporization:
40.65 kJ/mol

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.

Steam is contained in a closed rigid container with a volume of
2 m3 . Initially, the pressure and the temperature of the steam are
7 bar and 400°C, respectively. The temperature drops as a result of
heat transfer to the surroundings. i. Determine the temperature at
which the condensation first occurs in °C. [6 marks] ii. Evaluate
the fraction of the total mass that has condensed when the pressure
reaches 0.75 bar. [4 marks] iii. Calculate the volume in...

Steam is contained in a closed rigid container with a volume of
2 m3 . Initially, the pressure and the temperature of the steam are
7 bar and 400°C, respectively. The temperature drops as a result of
heat transfer to the surroundings. i. Determine the temperature at
which the condensation first occurs in °C. [6 marks] ii. Evaluate
the fraction of the total mass that has condensed when the pressure
reaches 0.75 bar. [4 marks] iii. Calculate the volume in...

A gas contained in a closed rigid container is heated from
initial temperature and pressure of 270C and 2 bar to a
final pressure of 12 bar. Calculate final temperature, Work done,
Heat transfer and change in Internal Energy. (Take
Cv as 0.873 kJ/kg K. and Mass of the gas =
1kg)

A closed container of air and water vapor is at 95 degrees
Celsius and 5000 mm Hg and contains 12% water by volume. Antoine
constants for water are A=7.97, B=1668.2, C=228.0. a) Calculate the
dew point temperature and degrees of superheat of the air-water
mixture. b) If the air-water mixture is cooled isobarically to a
point where the mole fraction of air is .915, what is the
temperature and percentage of the water vapor that condenses?

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 3 minutes ago

asked 8 minutes ago

asked 11 minutes ago

asked 26 minutes ago

asked 56 minutes ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 2 hours ago

asked 2 hours ago