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17) If 100 kJ is added to 0.5 kg of air at constant volume and the...
USE THE AIR TABLES 0.5 kg of air is initially at 280 K, 100 kPa in...
USE THE AIR TABLES 0.5 kg of air is initially at 280 K, 100 kPa in a frictionless adiabatic piston-cylinder. Find the volume of the cylinder (m). Find the initial internal energy (kj/kg) using the air tables. A. B. The air is compressed po ytropically according to P * (V)1.4 = constant to a volume which is 32.3% of the initial volume (V.-0323 V). Find the new volume (m), pressure (kPa), temperature (K) and internal energy (kJ/kg). Find the work...
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...
1. A rigid (constant volume) tank sealed by a valve initially contains 100 kg of air...
1. A rigid (constant volume) tank sealed by a valve initially contains 100 kg of air at a pressure of 100 kPa and 300 K. At time t = 0, the valve for the air tank is opened in a controlled manner and air leaks out isothermally (constant temperature) of the tank at a constant mass flow rate of 1 kg/s. The valve is closed after 75 seconds. Answer the following questions: Assuming air is an ideal gas, what is...
Surprise Quiz (1) The temperature at the beginning of the compression process of an air standard...
Surprise Quiz (1) The temperature at the beginning of the compression process of an air standard Otto cycle with a compression ratio of 8 is 27 °C=540 R, the pressure is 105 Pa, and the cylinder volume is 5.66 x 104 m². The maximum temperature during the cycle is 1727 °C=3600R. For the compression and PI 3 expansion processes, use T3 = 3600°R isentropic equations from equation sheet. Tv*-* = T, v*-? PV = P, V. n=11 - T3 =...
An ideal gas has a gas constant R = 0.3 kJ / kg K and the...
An ideal gas has a gas constant R = 0.3 kJ / kg K and the specific heat at constant volume is Cv = 0.7 kJ / Kg K. If the gas has a temperature change of 100 ° C. Choose the correct answer by making the corresponding calculations or justifications for each of the following cases: The change in enthalpy in KJ / kg a) 30 b) 70 c) 100 d) Insufficient information The work done is in kJ...
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)
A piston-cylinder assembly initially contains 0.8 kg of air at 100 kPa and 300 K. It...
A piston-cylinder assembly initially contains 0.8 kg of air at 100 kPa and 300 K. It is then compressed in a polytropic process PV3 = C to half the original volume. Assuming the ideal gas model for air and specific heat ratio is constant, k=1.4, determine (a) the final temperature, (b) work and heat transfer, each in kJ. R= 0.287 kJ/kg K. W, 82
A piston cylinder device contains air with a volume of 0.05 m3 at 25oC and 100...
A piston cylinder device contains air with a volume of 0.05 m3 at 25oC and 100 kPa pressure. The gas is now compressed to a final temperature of 95oC at 250 kPa. This compression is polytropic and follows PVn=constant. a. Determine how much boundary work was added to the gas [in kJ] b. How much heat was added or removed from this system during this process? [in kJ]
4. (20 points): In a constant-volume the start. The temperature of air at the beginning of the compre temperature attained in the cycle is 2100°C. Take kar-1.4 and Rar = 0.287 kJ/kg K. Determine. a)...
4. (20 points): In a constant-volume the start. The temperature of air at the beginning of the compre temperature attained in the cycle is 2100°C. Take kar-1.4 and Rar = 0.287 kJ/kg K. Determine. a) The compression ratio b) The thermal efficiency of the cycle c) The work done d) The mean effective pressure (MEP) if Pi = 100 kPa Otto cycle the pressure at the end of compression is 12 times thatt ssion is 40°C. The maximum
4. (20...
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...
USE THE AIR TABLES 0.5 kg of air is initially at 280 K, 100 kPa in a frictionless adiabatic piston-cylinder. Find the volume of the cylinder (m). Find the initial internal energy (kj/kg) using the air tables. A. B. The air is compressed po ytropically according to P * (V)1.4 = constant to a volume which is 32.3% of the initial volume (V.-0323 V). Find the new volume (m), pressure (kPa), temperature (K) and internal energy (kJ/kg). Find the work...
1. A rigid (constant volume) tank sealed by a valve initially contains 100 kg of air at a pressure of 100 kPa and 300 K. At time t = 0, the valve for the air tank is opened in a controlled manner and air leaks out isothermally (constant temperature) of the tank at a constant mass flow rate of 1 kg/s. The valve is closed after 75 seconds. Answer the following questions: Assuming air is an ideal gas, what is...
Surprise Quiz (1) The temperature at the beginning of the compression process of an air standard Otto cycle with a compression ratio of 8 is 27 °C=540 R, the pressure is 105 Pa, and the cylinder volume is 5.66 x 104 m². The maximum temperature during the cycle is 1727 °C=3600R. For the compression and PI 3 expansion processes, use T3 = 3600°R isentropic equations from equation sheet. Tv*-* = T, v*-? PV = P, V. n=11 - T3 =...
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)
A piston-cylinder assembly initially contains 0.8 kg of air at 100 kPa and 300 K. It is then compressed in a polytropic process PV3 = C to half the original volume. Assuming the ideal gas model for air and specific heat ratio is constant, k=1.4, determine (a) the final temperature, (b) work and heat transfer, each in kJ. R= 0.287 kJ/kg K. W, 82
4. (20 points): In a constant-volume the start. The temperature of air at the beginning of the compre temperature attained in the cycle is 2100°C. Take kar-1.4 and Rar = 0.287 kJ/kg K. Determine. a) The compression ratio b) The thermal efficiency of the cycle c) The work done d) The mean effective pressure (MEP) if Pi = 100 kPa Otto cycle the pressure at the end of compression is 12 times thatt ssion is 40°C. The maximum
4. (20...
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...
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