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,

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

2. For a certain gas, R = 0.377KJ/kg.K and k = 1.384. (a)What are the values of c, and a, ? (b) What mass of this gas would occupy a volume of 0.552 m at 517.11 kPa and 36.7 deg. Celsius? (c) If 31.65 kJ is transferred to this gas at constant volume, what are the resulting temperature and pressure? Use 2kgm

Air at a volume of 0.03m³, is at a pressure of 3.5 bar and 35°C respectively. Determine: i. the mass of gas present; ii. the temperature of the gas if the pressure increases to 1.05 MN/m? and the volume remains constant. iii. the density of the gas if pressure increases to 1.05 MN/m and the temperature remains constant.

Consider 0.5 kg of Refrigerant -134a contained in a piston-cylinder assembly with initial temperature of 80°C and pressure 7 bar. An adiabatic expansion brings the system to 48°C and 2 bar. A subsequent isobaric compression reduces the volume of the system to half of its initial volume. a) Create a p-v diagram (with dome shape included) and indicate the location of different states and processes. The diagram does not need to be on scale. b) Calculate the work involved in adiabatic expansion.