Classify the following states of 1 kg of water substance as wet, dry saturated, superheated steam, subcooled liquid, etc.:  (a) p = 0.1 MPa, T = 150C ,                  (b) p = 0.2 MPa, T  = 200C    (c) p = 0.2 MPa, S = 6.2 kJ/K,                            (d) p = 0.2 MPa, V  = 0.1  m3, (e) H = 2900 kJ, S = 6.2 kJ/K,

The diagram presented represents a thermodynamic process experienced by 27.5mmol (millimoles) of a monatomic ideal gas. The volume axis is divided into equal increments υ0=777cm3 while the pressure axis is divided into equal increments p0=0.301atm. Part (a)  How much work, in joules, does the gas perform on its environment during the thermodynamic process represented in the diagram?  Part (b)  What is the change, in joules, of the internal energy of the gas during the process represented in the diagram?  Part (c)  How much heat, in joules, is absorbed by the gas during the process represented in the diagram?

A fixed quantity of steam of mass 0.12 kg has an initial temperature and pressure of 375°C and 5.5 bar respectively. The steam undergoes a polytropic process according to the law PV1.25 = constant. Calculate (i) the initial volume of the steam, and (ii) the volume and temperature when the pressure is 3 bar. Indicate the process on a P-V diagram for water. [Answers: (i) 0.064 m3, (ii) 0.104 m3, 294.7°C]

A rigid tank filled with water is divided into two chambers by a membrane. The membrane is a perfect insulator and there is no heat transfer between the chambers. The volume of the water in chamber A and chamber B is VA = 1 m² and Vg = 4 m³, respectively. Initially (state 1) chamber A contains water at a temperature of 150 °C and a pressure of 350kPa. Chamber A also contains a plate of nickel with a mass of myi = 20 kg that is always in thermal equilibrium with the water. Chamber B contains 40 kg of water at a temperature of 80 °C. The membrane ruptures and heat transfers between the tank and its surroundings such that the water inside the tank reaches a uniform state, with a final temperature, T2, of 100°C. The specific heat of nickel is CpNi = 0.44 kJ/kg-K. c) Determine the pressure and specific internal energy of the water at the final state. (ie. P, and uz) d) Determine total heat transfer (between the tank and its surroundings) during the process. (ie. 1Q2) A В (Water) (Water)…

Using the tables for water, determine the specified property data at the indicated states. (a) At p = 3 bar, v = 0.35 m³/kg, find T in °C and u in kJ/kg. (b) At T = 320°C, v = 0.03 m³/kg, find p in MPa and u in kJ/kg. (c) At p = 28 MPa, T = 400°C, find v in m³/kg and h in kJ/kg. (d) At T = 10°C, v = 40 m³/kg, find p in kPa and h in kJ/kg.

Using the tables for water, determine the specified property data at the indicated states. (a) At p = 3 bar, v = 0.5 m/kg, find Tin °C and u in kJ/kg. (b) At T = 320°C, v = 0.03 m3/kg, find p in MPa and u în kJ/kg. (c) At p = 28 MPa, T = 500°C, find v in m/kg and h in kJ/kg. (d) At T = 10°C, v = 70 m/kg, find p in kPa and h in kJ/kg.

Using the tables for water, determine the specified property data at the indicated states. (a) At p = 3 bar, v = 0.3 m³ /kg, find T in °C and u in kJ/kg. T = U = (b) At T = 320°C, v = p = U = V = h = °C P = kJ/kg = 0.034 m³ /kg, find p in MPa and u in kJ/kg. (c) At p = 28 MPa, T = 400 °C, find v in m³ /kg and h in kJ/kg. m³/kg h = MPa kJ/kg (d) At T = 10°C, v = 100 m³ /kg, find p in kPa and h in kJ/kg. kJ/kg kPa kJ/kg

Q2

A cylinder-piston assembly initially contains water at 3 MPa and 300°C. The water is cooled at constant volume to 200 °C, and then compressed isothermally to a final pressure of 2.5 MPa. Sketch the process on a T-v diagram and find the specific volume at the 3 states. [Ans. 0.081l m kg. 0.0811, 1.155x10 m kg]

1bar, v1= 10m³ to p2 =10 bar , v2 = 1m³, calculate Q3/ An ideal gas is changed from p1 Q & W for the follwing process: a- Isothermal process. b- adiabatic compression followed by cooling process at constant pressure. c- Heating at constant volume followed by cooling at constant pressure? Take Cp= (5/2)R & Cv=(3/2) R