Air experiences a 50°C drop in temperature. Given that air has a gas constant of 287...
Air experiences a 50°C drop in temperature. Given that air has a gas constant of 287 J/kg·K and a specific heat ratio of 1.4, what is the total specific enthalpy change of the air?
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Air experiences a 50°C drop in temperature. Given that air has a
gas constant of 287...
Please help solve these questions. Thank you. Also, will the enthalpy increase be 92460 J/kg? 6...
Please help solve these questions. Thank
you.
Also, will the enthalpy increase be 92460 J/kg?
6 10) Some air increases temperature from 288 K to 380 K a t constant pressure. -7 What is the enthalpy increase of the air? -8 And what is the specific heat transfer ('heat done') on the air? Answer J/kg 50 11) What is the change in specific entropy of the air in Q10? Answer J/(kg K) 2 12) What is the isentropic stagnation pressure...
ANSWER [0.54 and 1.63] (b) Air flows through a converging-diverging nozzle. At point "A" in the converging section, the cross-sectional area is 50 cm2 and the Mach number was measured to b...
ANSWER [0.54 and 1.63]
(b) Air flows through a converging-diverging nozzle. At point "A" in the converging section, the cross-sectional area is 50 cm2 and the Mach number was measured to be 0.4. At point "B" in the diverging section, the cross-sectional area is 40 cm2. Find the possible Mach numbers at point "B" Assume that the flow is isentropic and the air specific ratio γ-1.4 and the gas constant R: 287 J/kg K.
(b) Air flows through a converging-diverging...
Air flows through a converging-diverging nozzle/diffuser. Assuming isentropic flow, air as an ideal gas, and constant...
Air flows through a converging-diverging nozzle/diffuser. Assuming isentropic flow, air as an ideal gas, and constant specific heats determine the state at several locations in the system. Solve using equations rather than with the tables. Note: The specific heat ratio and gas constant for air are given as k=1.4 and R-0287 kJ/kg-K respectively --Given Values-- Inlet Temperature: TI (K) 349 Inlet pressure: Pl (kPa) 460 Inlet Velocity: V1 (m/s) 73 Area at nozzle inlet: Al (cmA2) 8.19 Throat area: A...
For air as a calorically perfect gas, Cp = 1004.5 J/(kgK), R = 287 J/(kgK) and...
For air as a calorically perfect gas, Cp = 1004.5 J/(kgK), R = 287 J/(kgK) and y = 1.4. 2. For isentropic flow of a calorically perfect gas, begin with the equations, (p/p') = constant and {p/(PT)} = constant, and provide steps to obtain p, T equation. Then obtain the equation (p2/pı) = (T2/T2) V(-1).
Assume ideal gas, air gamma = 1.4, R = 287 J/kgK. ~ Use normal shock tables!...
Assume ideal gas, air gamma = 1.4, R = 287 J/kgK.
~ Use normal shock tables! ~
A pitot-static probe designed for subsonic flow shows the velocity calculated from the ratio of stagnation pressure to static pressure and a fixed stagnation temperature of 350 K. Determine the indicated velocity and the actual velocity when the pitot- static probe is erroneously used in supersonic flow, with a stagnation pressure to static pressure ratio of 1.5.
An ideal turbojet engine is analyzed using the cold air standard method. Given specific operating conditions...
An ideal turbojet engine is analyzed using the cold air standard method. Given specific operating conditions determine the temperature, pressure, and enthalpy at each state, and the exit velocity. Note: The specific heat ratio and gas constant for air are given as k=1.4 and R=0.287 kJ/kg-K respectively. --Given Values-- T1 (K) = 236 P1 (kPa) = 56 V1 (m/s) = 217 rp = 11.1 rc = 1.78 a) Determine the temperature (K) at state 2. b) Determine the pressure (kPa)...
2. Find the specific enthalpy of air at a temperature of 54°C assume air behaves as an ideal gas....
2. Find the specific enthalpy of air at a temperature of 54°C assume air behaves as an ideal gas. (Use 273 instead of 273.15)
2. Find the specific enthalpy of air at a temperature of 54°C assume air behaves as an ideal gas. (Use 273 instead of 273.15)
Air flows through a converging-diverging nozzle/diffuser. Assuming isentropic flow, air as an ideal gas, and constant...
Air flows through a converging-diverging nozzle/diffuser. Assuming isentropic flow, air as an ideal gas, and constant specific heats determine the state at several locations in the system. Note: The specific heat ratio and gas constant for air are given as k=1.4 and R=0.287 kJ/kg-K respectively. --Given Values-- Inlet Temperature: T1 (K) = 360 Inlet pressure: P1 (kPa) = 583 Inlet Velocity: V1 (m/s) = 105 Area at inlet (cm^2) = 8.2 Mach number at the exit = 1.86 a) Determine...
Q 1: In an air conditioning system return air at 26°C dry-bulb temperature and 50% relative...
Q 1: In an air conditioning system return air at 26°C dry-bulb temperature and 50% relative humidity is mixed with outdoor ambient air at 34°C dry-bulb temperature and 60% relative humidity. The dry air mass flow rate of outdoor air is 30% of the supply air mass flow rate to the space. The pressure is constant at 101.3 kPa. Calculate (i) the enthalpy, (ii) the humidity ratio, and (ii) the dry-bulb temperature of the supply air. (i) Compare the results...
Question 5 (a) A sample of moist air at a temperature of 36 °C and total...
Question 5 (a) A sample of moist air at a temperature of 36 °C and total pressure 1.01 bar has 0.018 kg of moisture per kg of dry air. Calculate the relative humidity and the enthalpy (kJ/kg of dry air) of the air. (8 marks) (b) The air in (a) is cooled at constant total pressure until condensation of water just begins. Calculate the temperature and the enthalpy (kJ per kg of dry air) when condensation just begins. (6 marks)...
Please help solve these questions. Thank
you.
Also, will the enthalpy increase be 92460 J/kg?
6 10) Some air increases temperature from 288 K to 380 K a t constant pressure. -7 What is the enthalpy increase of the air? -8 And what is the specific heat transfer ('heat done') on the air? Answer J/kg 50 11) What is the change in specific entropy of the air in Q10? Answer J/(kg K) 2 12) What is the isentropic stagnation pressure...
ANSWER [0.54 and 1.63]
(b) Air flows through a converging-diverging nozzle. At point "A" in the converging section, the cross-sectional area is 50 cm2 and the Mach number was measured to be 0.4. At point "B" in the diverging section, the cross-sectional area is 40 cm2. Find the possible Mach numbers at point "B" Assume that the flow is isentropic and the air specific ratio γ-1.4 and the gas constant R: 287 J/kg K.
(b) Air flows through a converging-diverging...
Air flows through a converging-diverging nozzle/diffuser. Assuming isentropic flow, air as an ideal gas, and constant specific heats determine the state at several locations in the system. Solve using equations rather than with the tables. Note: The specific heat ratio and gas constant for air are given as k=1.4 and R-0287 kJ/kg-K respectively --Given Values-- Inlet Temperature: TI (K) 349 Inlet pressure: Pl (kPa) 460 Inlet Velocity: V1 (m/s) 73 Area at nozzle inlet: Al (cmA2) 8.19 Throat area: A...
For air as a calorically perfect gas, Cp = 1004.5 J/(kgK), R = 287 J/(kgK) and y = 1.4. 2. For isentropic flow of a calorically perfect gas, begin with the equations, (p/p') = constant and {p/(PT)} = constant, and provide steps to obtain p, T equation. Then obtain the equation (p2/pı) = (T2/T2) V(-1).
Assume ideal gas, air gamma = 1.4, R = 287 J/kgK.
~ Use normal shock tables! ~
A pitot-static probe designed for subsonic flow shows the velocity calculated from the ratio of stagnation pressure to static pressure and a fixed stagnation temperature of 350 K. Determine the indicated velocity and the actual velocity when the pitot- static probe is erroneously used in supersonic flow, with a stagnation pressure to static pressure ratio of 1.5.
2. Find the specific enthalpy of air at a temperature of 54°C assume air behaves as an ideal gas. (Use 273 instead of 273.15)
2. Find the specific enthalpy of air at a temperature of 54°C assume air behaves as an ideal gas. (Use 273 instead of 273.15)
Air flows through a converging-diverging nozzle/diffuser. Assuming isentropic flow, air as an ideal gas, and constant specific heats determine the state at several locations in the system. Note: The specific heat ratio and gas constant for air are given as k=1.4 and R=0.287 kJ/kg-K respectively. --Given Values-- Inlet Temperature: T1 (K) = 360 Inlet pressure: P1 (kPa) = 583 Inlet Velocity: V1 (m/s) = 105 Area at inlet (cm^2) = 8.2 Mach number at the exit = 1.86 a) Determine...
Q 1: In an air conditioning system return air at 26°C dry-bulb temperature and 50% relative humidity is mixed with outdoor ambient air at 34°C dry-bulb temperature and 60% relative humidity. The dry air mass flow rate of outdoor air is 30% of the supply air mass flow rate to the space. The pressure is constant at 101.3 kPa. Calculate (i) the enthalpy, (ii) the humidity ratio, and (ii) the dry-bulb temperature of the supply air. (i) Compare the results...
Question 5 (a) A sample of moist air at a temperature of 36 °C and total pressure 1.01 bar has 0.018 kg of moisture per kg of dry air. Calculate the relative humidity and the enthalpy (kJ/kg of dry air) of the air. (8 marks) (b) The air in (a) is cooled at constant total pressure until condensation of water just begins. Calculate the temperature and the enthalpy (kJ per kg of dry air) when condensation just begins. (6 marks)...
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