when is to use R=0.287 kj/kg.K and Cv=0.718? when is to use gamma = 1.4
Homework Answers
R=0.287kj/kgk and cv=.718kj/kg k used when working medium is ideal gas.Air act like ideal gas so we can use the constant R and cv Values that are mentioned above.Gamma(r) value calculated by r=(1+2/n) ,where n = number of degree of freedom of atom ,for diatomic gas Dof = 5. r=(1+2/5) r=1.44 .Air is act like diatomic gas so we can use r=1.4 for air.Examples of diatomic gases H2 ( two hydrogen atoms),O2 ( two oxygen atoms ) ,CO(1carbon + 1 oxygen),HCL( one hydrogen and one chlorine).
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when is to use R=0.287 kj/kg.K and Cv=0.718?
when is to use gamma = 1.4
1)(Hint: Cp=1.005 kJ/kg-K, Cv=0.718 kJ/kg-K, R=0.287 kJ/kg-K). An air-tight room contains 80 kg of air, and...
1)(Hint: Cp=1.005 kJ/kg-K, Cv=0.718 kJ/kg-K, R=0.287 kJ/kg-K). An air-tight room contains 80 kg of air, and a 2-kW baseboard electric resistance heater in the room is turned on and kept on for 15 min. The temperature rise of air at the end of 15 min is 2)An example of when it is appropriate to model a substance as an ideal gas is when a. The pressure and temperature are close to the critcal point b. The pressure and temperature are...
Take cp 1.004 kJ/kg.K, c0.718 kJ/kg.K, k 1.4 for all problems that include gas cycles.
Take cp 1.004 kJ/kg.K, c0.718 kJ/kg.K, k 1.4 for all problems that include gas cycles.
An air-standard cycle is executed within a closed piston–cylinder system, and it consists of the following...
An air-standard cycle is
executed within a closed piston–cylinder system, and it consists of
the following three processes: 1–2 V = Constant heat addition from
100 kPa and 30°C to 850 kPa 2–3 Isothermal expansion until V3 =
8.5V2 3–1 P = Constant heat rejection to the initial state Assume
air has constant properties with cv = 0.718 kJ/kg·K, cp = 1.005
kJ/kg·K, R = 0.287 kJ/kg·K, and k = 1.4.
Required information An air-standard cycle is executed within a...
1. (10 pts) A 10 m® rigid storage tank contains oxygen gas (R = 0.2598 kJ/kg.K,...
1. (10 pts) A 10 m® rigid storage tank contains oxygen gas (R = 0.2598 kJ/kg.K, Cp = 0.918 kJ/kg.K, cv = 0.658 kJ/kg.K). The tank is initially 200 kPa and 600° It is cooled to 25°C in 35 minutes. Determine: 1. (3 pts) The mass of oxygen in the tank, in kg. 2. (3 pts) The final pressure in the tank, in kPa. 3. (4 pts) The rate of heat transfer from the oxygen, in kW.
Required information An air-standard Diesel cycle has a compression ratio of 16 and a cutoff rati...
Required information An air-standard Diesel cycle has a compression ratio of 16 and a cutoff ratio of 2. At the beginning of the compression process, air is at 103 kPa and 27℃. Assume constant specific heats. The properties of air at room temperature are Cp-1.005 kJ/kg-K, cv-0718 kJ/kg.K, R= 0.287 kJ/kg-K, and k = 1.4 Determine the mean effective pressure The mean effective pressure is「 kPa.
Required information An air-standard Diesel cycle has a compression ratio of 16 and a...
Please clear hind writing. Cp=1.0004., cv=0.718 . K=1.4 cl lcavg C 10 Determine the net work,...
Please clear hind writing. Cp=1.0004., cv=0.718 . K=1.4
cl lcavg C 10 Determine the net work, and the thermal efficiency for the gas turbine shown in the next figure. Knowing that the high pressure turbine is used to drive the compressor. All necessary data are included in the figure and assume that all processes are ideal Exhaust Regenerator Burner Air ntake urbinen150Kw urbine Compressor Turbine P 100 kPa 300 K P-100 kPa -1600 K
For air, y- 1.4, cp 1.005 k]/kg K, R- 0.287 kJ/kg K unless stated in question....
For air, y- 1.4, cp 1.005 k]/kg K, R- 0.287 kJ/kg K unless stated in question. 1. Air flows adiabatically through a duct. At point 1 the velocity is 240m/s, with T1 - 320 K and p1 170 kPa. Compute i. To ii. (Mach number) ii. At point 2 further downstream V2-290 m/s and P2-135 kPa. What is the stagnation pressure Po2 Hints: Given the properties it is easy to solve for the Mach number using the following formulas To/T...
(8 Marks) (b) A two-cylinder petrol engine has a swept volume of 2500 cm, and the...
(8 Marks) (b) A two-cylinder petrol engine has a swept volume of 2500 cm, and the clearance volume in each cylinder is 70 cm. Calculate the air standard cycle efficiency. If the air intake conditions are 1.1 bar and 26°C, and the maximum cycle temperature is 1460°C, calculate the mean effective pressure based on the air standard cycle. [Cv of air = 0.718 kJ/kg.K; R of air = 287 J/kg.K; y of air = 1.4] (12 Marks)
Consider a piston cylinder process in air (as an ideal gas with constant specific heats) which...
Consider a piston cylinder process in air (as an ideal gas with constant specific heats) which goes from state 1 at 1 atm, 300 K to state 2 at: 3 atm and 400K. (use k=1.4, Cp = 1.005 kJ/(kg K), Cv=0.718 kJ/(kg K), R= 0.287 kJ/(kg K)) (these are the same conditions as question 4). What must the heat transfer be (in kJ/kg), if the process takes place without entropy generation and it can be assumed the temperature at system...
uestion l [use R= 0.287 kJ/kg K, c,-1.0035 kJ/kg K1 a) Air flowing at a rate...
uestion l [use R= 0.287 kJ/kg K, c,-1.0035 kJ/kg K1 a) Air flowing at a rate of 1.6 kg/min is compressed by a 5 kW compressor under steady-state conditions, from 100 kPa and 17°C to 600 kPa and 167°C. During this process, some heat transfer takes place between the compressor and the surrounding medium at 17°C. Determine the rate of entropy change of air during this process, stating clearly any assumptions. (5 Marks)
Take cp 1.004 kJ/kg.K, c0.718 kJ/kg.K, k 1.4 for all problems that include gas cycles.
An air-standard cycle is
executed within a closed piston–cylinder system, and it consists of
the following three processes: 1–2 V = Constant heat addition from
100 kPa and 30°C to 850 kPa 2–3 Isothermal expansion until V3 =
8.5V2 3–1 P = Constant heat rejection to the initial state Assume
air has constant properties with cv = 0.718 kJ/kg·K, cp = 1.005
kJ/kg·K, R = 0.287 kJ/kg·K, and k = 1.4.
Required information An air-standard cycle is executed within a...
1. (10 pts) A 10 m® rigid storage tank contains oxygen gas (R = 0.2598 kJ/kg.K, Cp = 0.918 kJ/kg.K, cv = 0.658 kJ/kg.K). The tank is initially 200 kPa and 600° It is cooled to 25°C in 35 minutes. Determine: 1. (3 pts) The mass of oxygen in the tank, in kg. 2. (3 pts) The final pressure in the tank, in kPa. 3. (4 pts) The rate of heat transfer from the oxygen, in kW.
Required information An air-standard Diesel cycle has a compression ratio of 16 and a cutoff ratio of 2. At the beginning of the compression process, air is at 103 kPa and 27℃. Assume constant specific heats. The properties of air at room temperature are Cp-1.005 kJ/kg-K, cv-0718 kJ/kg.K, R= 0.287 kJ/kg-K, and k = 1.4 Determine the mean effective pressure The mean effective pressure is「 kPa.
Required information An air-standard Diesel cycle has a compression ratio of 16 and a...
Please clear hind writing. Cp=1.0004., cv=0.718 . K=1.4
cl lcavg C 10 Determine the net work, and the thermal efficiency for the gas turbine shown in the next figure. Knowing that the high pressure turbine is used to drive the compressor. All necessary data are included in the figure and assume that all processes are ideal Exhaust Regenerator Burner Air ntake urbinen150Kw urbine Compressor Turbine P 100 kPa 300 K P-100 kPa -1600 K
For air, y- 1.4, cp 1.005 k]/kg K, R- 0.287 kJ/kg K unless stated in question. 1. Air flows adiabatically through a duct. At point 1 the velocity is 240m/s, with T1 - 320 K and p1 170 kPa. Compute i. To ii. (Mach number) ii. At point 2 further downstream V2-290 m/s and P2-135 kPa. What is the stagnation pressure Po2 Hints: Given the properties it is easy to solve for the Mach number using the following formulas To/T...
(8 Marks) (b) A two-cylinder petrol engine has a swept volume of 2500 cm, and the clearance volume in each cylinder is 70 cm. Calculate the air standard cycle efficiency. If the air intake conditions are 1.1 bar and 26°C, and the maximum cycle temperature is 1460°C, calculate the mean effective pressure based on the air standard cycle. [Cv of air = 0.718 kJ/kg.K; R of air = 287 J/kg.K; y of air = 1.4] (12 Marks)
Consider a piston cylinder process in air (as an ideal gas with constant specific heats) which goes from state 1 at 1 atm, 300 K to state 2 at: 3 atm and 400K. (use k=1.4, Cp = 1.005 kJ/(kg K), Cv=0.718 kJ/(kg K), R= 0.287 kJ/(kg K)) (these are the same conditions as question 4). What must the heat transfer be (in kJ/kg), if the process takes place without entropy generation and it can be assumed the temperature at system...
uestion l [use R= 0.287 kJ/kg K, c,-1.0035 kJ/kg K1 a) Air flowing at a rate of 1.6 kg/min is compressed by a 5 kW compressor under steady-state conditions, from 100 kPa and 17°C to 600 kPa and 167°C. During this process, some heat transfer takes place between the compressor and the surrounding medium at 17°C. Determine the rate of entropy change of air during this process, stating clearly any assumptions. (5 Marks)
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